Measurement sensor for mold inside information

TECHNICAL FIELD

0001The present invention relates to a measurement sensor for mold inside information which is suitable for determining quality of casting products or resin molding products as detecting pressure of melt in a mold of a die-cast machine for pressure-casting of metallic material such as aluminum alloy and magnesium or melt in a mold for resin molding, gas pressure, and melt temperature.

BACKGROUND ART

0002It has been known that quality of die-cast products is influenced by injection speed and injection pressure when filling metal melt into a mold. In an injection process to fill metal melt into a mold of a die-cast machine, to prevent air entrapment into the metal melt and the like, metal melt is supplied to a plunger sleeve and a plunger is moved frontward as being driven at low injection speed until the plunger sleeve and a product runner portion are filled up. Subsequently, when the plunger is moved to a position reaching where a top end of the metal melt reaches a gate, the metal melt is rapidly filled into the mold cavity with driving of the plunger to be switched to high injection speed. Subsequently, when the metal melt is filled into the mold cavity, the metal melt is pressurized by increasing pressure of the plunger.

0003As illustrated in <figref idref="DRAWINGS">FIG. 8</figref>, a mold used for a die-cast machine is structured with a movable die <b>1</b><i>a </i>and a fixed die <b>1</b><i>b</i>. A cavity <b>2</b> formed by both of the dies <b>1</b><i>a</i>, <b>1</b><i>b </i>is provided with a sprue <b>3</b><i>a</i>, a runner <b>3</b><i>b </i>and a gate <b>3</b><i>c </i>connected to an injection cylinder, and further, with an air vent <b>4</b> for draining gas in the cavity <b>2</b> and an overflow <b>5</b>.

0004<figref idref="DRAWINGS">FIG. 9</figref> is a sectional view illustrating a state that metal melt is filled into the cavity <b>2</b> of a mold in a die-cast machine. In this drawing, a predetermined amount of metal melt ML is supplied through a pouring port <b>6</b><i>a </i>of the plunger sleeve <b>6</b> with a ladle. This drawing illustrates an injecting state while a plunger <b>7</b> is driven at low speed from a state that the predetermined amount of metal melt ML is supplied into the plunger sleeve <b>6</b>. In a slow-speed injecting state, gas G exists along with the metal melt ML at the front side of a plunger tip <b>7</b><i>a </i>and gas G exists also at the runner <b>3</b><i>b </i>which introduces the metal melt ML in the plunger sleeve <b>6</b> to the cavity <b>2</b>. Further, a position FP indicated in <figref idref="DRAWINGS">FIG. 9</figref> denotes a point at which the plunger <b>7</b> is switched from low-speed movement to high-speed movement. When the plunger tip <b>7</b><i>a </i>reaches the position FP, the metal melt ML is filled into the plunger sleeve <b>6</b> and the runner <b>3</b><i>b </i>and a top end part of the metal melt ML reaches the gate <b>3</b><i>c</i>. That is, the position FP is a filling start position at which filling of the metal melt ML into the cavity <b>2</b> is started.

0005<figref idref="DRAWINGS">FIG. 10</figref> is a view indicating variation waveforms of injection speed J of the plunger <b>7</b>, injection pressure K, metal pressure L, gas pressure M and metal temperature T at the time of injection molding in chronological order along a time axis. In this drawing, the injection pressure is approximately at a constant value while the plunger <b>7</b> is moved at high injection speed. Subsequently, filling pressure is rapidly increased and maintained thereat owing to pressure rising. In contrast, the metal pressure hardly rises while the plunger <b>7</b> is moved at high injection speed. The metal pressure rises approximately to machine pressure when the cavity <b>2</b> is filled up with the metal melt ML, and then, starts to drop along with solidification of metal melt at the gate <b>3</b><i>c. </i>

0006By the way, there occur oxide films at metal melt and solidification films when filling into a plunger sleeve. When solidification films, oxide films and the like crushed in injection operation are caught at an inlet gate section during filling while the metal melt ML reaches the gate <b>3</b><i>c</i>, supplying of melt is discontinued. As illustrated in <figref idref="DRAWINGS">FIG. 10</figref>, the metal pressure of the metal melt to the cavity <b>2</b> is not raised to be in a state of lacking at a midpoint like a curved line B or a curved line C without reaching a normal metal pressure curved line A. Owing to non-pressurization, a molded product is to be a defective in which many air bubbles remain therein.

0007Approximately 95% of die-cast products are manufactured by cold-chamber die-cast machines with aluminum-based material. However, mechanical properties (tensile strength, extension) are not indicated in Japanese Industrial Standard (JIS). A main reason of the above is that there is a problem of difficulty to evaluate mechanical properties on a quality basis. When melt is poured into a cold chamber and solidification films and oxide films crushed in injection operation are caught at an inlet gate section, there is a high possibility of manufacturing porous products having a large number of blowholes at the inside thereof even with the same external appearance as non-defective products owing to disconnection of melt supply and non-transmission of pressure. Mechanical properties of such porous products are extremely worsened.

0008Since a plurality of air vents is formed in the mold cavity, it is extremely difficult to measure a gas flow amount as attaching gas flow meters to all of the air vents and to control product quality with the measured gas flow amount. Alternatively, there is a method to detect gas pressure from an air vent. However, stable detection cannot be performed owing to adhering of casting fins to an air vent. In addition, there is gas discharged from mating faces of cores, so that the detection cannot be performed.

0009There has been known a technology to reduce quality variation caused by gas contained in a die-cast product as suppressing gas to be contained in the die-cast product with casting of a vacuum die-casting method (e.g., see Patent Literature 1). However, in this case as well, measurement of vacuum has been difficult.

CITATION LIST

Patent Literature

0000<ul id="ul0001" list-style="none"><li id="ul0001-0001" num="0010">Patent Literature 1: Japanese Patent Application Laid-Open No. 8-332558</li></ul>

SUMMARY OF INVENTION

Technical Problem

0011Traditionally, although quality management of die-casting has been controlled based on data from a die-cast machine side, controlling of information from a mold has been hardly performed. Although pressure in a mold cavity is increased with incomplete discharging of gas in the mold cavity, there has been a problem of an increased reject rate on a quality basis as being influenced by gas entrapment and the like into a die-cast product.

0012Further, in a case that cooling water remains in a mold or exudes with mold cracking, explosion occurs in the mold at the moment of contacting of melt with moisture. However, any information cannot be obtained from the mold.

0013If it is possible to determine whether or not a die-cast product has sufficient strength for each shot of casting, defectives are prevented from being fed to a subsequent process and yield can be improved consequently. Accordingly, in a case of manufacturing die-cast products as injecting metal melt such as melted aluminum alloy or the like into a cavity which is formed in a mold by using a die-cast machine, it is required to measure metal melt pressure and metal melt temperature in the mold during injection and gas pressure of gas in the cavity compressed by filling of metal melt. Here, it is important for manufacturing with stable quality to reliably perform discharging of gas in the cavity.

0014Such necessity to detect pressure and temperature of metal and pressure of gas in a die-cast machine is the same as in a case of resin molding with a mold.

0015The present invention has an object to provide a measurement sensor for mold inside information being suitable for performing quality determination of pressure-casting products which are obtained by casting or molding while melt such as metal or resin fed into a plunger sleeve by a specified amount is pressurized and filled into a mold cavity by a plunger.

Solution to Problem

0016In order to achieve the object, according to the present invention, a measurement sensor for mold inside information capable of detecting gas pressure in a cavity, includes: a rod-shaped casing which is capable of being attached to an attachment hole formed at a mold and opened to the cavity; a porous filter of which top end face is capable of being matched with a mold cavity face as being arranged at a top end of the rod-shaped casing and which is capable of separating gas from melt; an introduction chamber of cavity gas introduced through the porous filter as being arranged behind the porous filter; and a gas pressure sensor which detects pressure of the gas introduction, chamber.

0017According to the present invention, a measurement sensor for mold inside information capable of detecting gas pressure in a cavity and melt pressure in the cavity, includes: a rod-shaped casing which is capable of being attached to an attachment hole formed at a mold and opened to the cavity; a porous filter of which top end face is capable of being matched with a mold cavity face as being arranged at a top end of the rod-shaped casing and which is capable of separating gas from melt; an introduction chamber of cavity gas introduced through the porous filter as being arranged behind the porous filter; a gas pressure sensor which detects pressure of the gas introduction chamber; a pressure transmission rod which is inserted into the rod-shaped casing and of which top end face is capable of being matched with the mold cavity face as being movable in the axial center direction; and a pressure sensor which is fixed and held as being faced to a rear end of the pressure transmission rod and which is capable of detecting pressure of melt filled into the cavity.

0018Further, a measurement sensor for mold inside information capable of detecting gas pressure in a cavity and melt temperature in the cavity, includes: a rod-shaped casing which is capable of being attached to an attachment hole formed at a mold and opened to the cavity; a porous filter of which top end face is capable of being matched with a mold cavity face as being arranged at a top end of the rod-shaped casing and which is capable of separating gas from melt; an introduction chamber of cavity gas introduced through the porous filter as being arranged behind the porous filter; a gas pressure sensor which detects pressure of the gas introduction chamber; a rod which is inserted into the rod-shaped casing and of which top end face is capable of being matched with the mold cavity face as being movable in the axial center direction; and a temperature sensor which is attached to a thin hole formed at a center part of the rod and which includes a thermocouple having a detection end at a rod top end part side of the thin hole.

0019Further, according to the present invention, a measurement sensor for mold inside information capable of detecting gas pressure in a cavity, melt pressure in the cavity and melt temperature in the cavity, includes: a rod-shaped casing which is capable of being attached to an attachment hole formed at a mold and opened to the cavity; a porous filter of which top end face is capable of being matched with a mold cavity face as being arranged at a top end of the rod-shaped casing and which is capable of separating gas from melt; an introduction chamber of cavity gas introduced through the porous filter as being arranged behind the porous filter; a gas pressure sensor which detects pressure of the gas introduction chamber; a pressure transmission rod which is inserted into the rod-shaped casing and of which top end face is capable of being matched with the mold cavity face as being movable in the axial center direction; a pressure sensor which is fixed and held as being faced to a rear end of the pressure transmission rod and which is capable of detecting pressure of melt filled into the cavity; and a temperature sensor which is attached to a thin hole formed at a center part of the pressure transmission rod and which includes a thermocouple having a detection end at a rod top end part side of the thin hole.

0020In addition to the configuration above, the measurement sensor for mold inside information may include a fixing unit which includes a flareless joint slidably attached to an outer circumference of the rod-shaped casing and a locking screw to the attachment hole, wherein rod insertion length is adjustable in accordance with mold thickness.

0021Further, compressed-air supply means may be connected to the gas introduction chamber to enable to supply purge air to the porous filter.

0022According to the present invention, a measurement sensor for mold inside information capable of detecting gas pressure in a cavity, includes: a rod-shaped casing which is capable of being attached to an attachment hole formed at a mold and opened to the cavity and which is longer than thickness of the mold; a sensor block which is arranged at a base end part of the rod-shaped casing; a porous filter of which top end face is capable of being matched with a mold cavity face as being arranged at a top end of the rod-shaped casing and which is capable of separating gas from melt; an introduction chamber of cavity gas introduced through the porous filter as being arranged at the sensor block; and a gas pressure sensor which detects pressure of the gas introduction chamber as being arranged at the sensor block.

0023According to the present invention, a measurement sensor for mold inside information capable of detecting gas pressure in a cavity and melt pressure in the cavity, includes: a rod-shaped casing which is capable of being attached to an attachment hole formed at a mold and opened to the cavity and which is longer than thickness of the mold; a sensor block which is arranged at a base end part of the rod-shaped casing; a porous filter of which top end face is capable of being matched with a mold cavity face as being arranged at a top end of the rod-shaped casing and which is capable of separating gas from melt; an introduction chamber of cavity gas introduced through the porous filter as being arranged at the sensor block; a gas pressure sensor which detects pressure of the gas introduction chamber as being arranged at the sensor block; a pressure transmission rod which is inserted into the rod-shaped casing and of which top end face is capable of being matched with the mold cavity face as being movable in the axial center direction; and a pressure sensor which is held at a space against the sensor block as being faced to a rear end of the pressure transmission rod and which is capable of detecting pressure of melt filled into the cavity.

0024The pressure transmission rod may be configured to be inserted to a center part of the porous filter which is ring-shaped; and a thermocouple is placed in a thin hole which reaches a rod top end part as being formed at a center part of the pressure transmission rod.

Advantageous Effects of Invention

0025According to the present invention being used for a pressure-casting machine to cast a product while metal melt which is fed into a plunger sleeve by a specified amount is pressurized and filled into a mold by a plunger, it is possible to monitor the inside of a cavity of the mold. In particular, quality management can be performed by measuring metal pressure at a mold side for detecting as anomalous pressure when a cold flake is caught by a gate and by monitoring pressure drop speed due to solidification shrinkage.

0026Further, it is possible to control gas entrapment of melt which enters from a gate by managing pressure of gas (mixture gas of air, vapor and the like) of a cavity (a mold of a product part) and vacuum in a vacuum die-casting method. Further, since entering melt in the cavity is solidified instantaneously, temperature of melt can be controlled by measuring mold temperature at that time.

0027Production sites of die-casting have poor surroundings. Since three sensors are included into a single sensor and a top end of a pin can be easily attached to and detached from a mold face (a back face of a product or the like), excellent operational efficiency is obtained. Further, it is also possible to observe an injection waveform and a pressure waveform in the cavity against a common time axis by appropriately connecting a monitoring device to a pressure measurement portion in the cavity. Owing to integration of a plurality of measurement sensors for measuring pressure of metal melt and gas pressure of gas in the cavity compressed by filling of the metal melt, cost for attaching can be reduced as reducing operational time for attaching to and detaching from the mold.

BRIEF DESCRIPTION OF DRAWINGS

0028<figref idref="DRAWINGS">FIG. 1</figref> is a longitudinal sectional view of a measurement sensor for mold inside information according to a first embodiment.

0029<figref idref="DRAWINGS">FIG. 2</figref> is a sectional view of a sensor block body which structures the measurement sensor for mold inside information according to the first embodiment.

0030<figref idref="DRAWINGS">FIG. 3</figref> is a partially-sectioned plane view of a sensor block of the measurement sensor for mold inside information according to the first embodiment.

0031<figref idref="DRAWINGS">FIG. 4</figref> is a side view of the measurement sensor for mold inside information according to the first embodiment.

0032<figref idref="DRAWINGS">FIG. 5</figref> is a schematic sectional view in a state that a measurement rod having the measurement sensor for mold inside information according to the first embodiment attached to a top end thereof is attached to a mold.

0033<figref idref="DRAWINGS">FIG. 6</figref> is a sectional view schematically illustrating a structure of a measurement sensor for mold inside information according to a second embodiment.

0034<figref idref="DRAWINGS">FIG. 7</figref> is a longitudinal partially-sectioned view illustrating a whole structure of a measurement rod having the measurement sensor for mold inside information of the second embodiment attached to a top end thereof.

0035<figref idref="DRAWINGS">FIG. 8</figref> is a partially-removed perspective view of a mold used for a die-cast machine.

0036<figref idref="DRAWINGS">FIG. 9</figref> is a sectional view illustrating a state that metal melt is filled into a mold cavity of the present invention.

0037<figref idref="DRAWINGS">FIG. 10</figref> is a view indicating metal pressure, gas pressure and mold temperature at the time of pressure-casting in chronological order.

DESCRIPTION OF EMBODIMENTS

0038In the following, embodiments of a measurement sensor for mold inside information according to the present invention will be described in detail with reference to the drawings.

0039<figref idref="DRAWINGS">FIGS. 1 to 5</figref> illustrate a measurement sensor <b>100</b> for mold inside information according to a first embodiment. <figref idref="DRAWINGS">FIG. 1</figref> is a longitudinal sectional view of the measurement sensor <b>100</b> for mold inside information. <figref idref="DRAWINGS">FIG. 2</figref> is a sectional view of a sensor block body. <figref idref="DRAWINGS">FIG. 3</figref> is a partially-sectioned plane view of a sensor block. <figref idref="DRAWINGS">FIG. 4</figref> is a right side view of <figref idref="DRAWINGS">FIG. 1</figref>. <figref idref="DRAWINGS">FIG. 5</figref> is a schematic sectional view illustrating an attaching state to a mold.

0040The measurement sensor <b>100</b> for mold inside information according to the first embodiment is capable of being attached to a movable die <b>1</b><i>a </i>(or a fixed die <b>1</b><i>b</i>) of a mold. Accordingly, as illustrated in <figref idref="DRAWINGS">FIG. 5</figref>, an attachment hole <b>8</b> which reaches a cavity <b>2</b> from a back face thereof is formed at the movable die <b>1</b><i>a</i>. The measurement sensor <b>100</b> for mold inside information includes a measurement rod <b>102</b> which is inserted and attached to the attachment hole <b>8</b> so that a top face thereof is matched with a surface of the cavity <b>2</b> and a sensor block <b>104</b> which is arranged at a base end of the measurement rod <b>102</b> as being located outside the movable die <b>1</b><i>a. </i>

0041To accept thickness of the movable die <b>1</b><i>a</i>, a fixing unit <b>110</b> which includes a flareless joint <b>106</b> and a locking screw <b>108</b> is slidably attached to an outer circumferential section at a midpoint of the measurement rod <b>102</b>. A top end position of the measurement rod <b>102</b> is adjusted to be matched with a face of the cavity <b>2</b> of the mold and the locking screw <b>108</b> is tightened to an attachment hole <b>14</b> of the movable die <b>1</b><i>a</i>, and then, the flareless joint <b>106</b> is rotated to bite into an outer circumferential face of the measurement rod <b>102</b>. In this manner, the measurement rod <b>102</b> is fixed to a specified position.

0042As illustrated in <figref idref="DRAWINGS">FIG. 1</figref>, the measurement rod <b>102</b> includes an outer-cylindrical casing <b>112</b> and a pressure transmission rod <b>114</b> which is arranged at a center part thereof along the axial center direction. The pressure transmission rod <b>114</b> is a columnar body of which outer diameter is smaller than an inner diameter of the outer-cylindrical casing <b>112</b> to form a communication passage <b>115</b> between the outer-cylindrical casing <b>112</b> and the pressure transmission rod <b>114</b>. The outer-cylindrical casing <b>112</b> is formed to have a slightly-enlarged inner diameter at the top end part of the measurement rod <b>102</b>, and the top end of the pressure transmission rod <b>114</b> is formed to have a cross-section being smaller than a rod body section. Between the above, a ring-shaped porous filter <b>116</b> and a guide bush <b>118</b> are sequentially attached side by side from the rod top end side. Similarly to the first embodiment, the porous filter <b>116</b> is formed of material such as alumina ceramics and carbon nanotube having fine holes to which metal melt of aluminum or the like does not enter. Further, the guide bush <b>118</b> is formed of hard ceramic such as silicon nitride and zirconia having low heat conductivity. The guide bush <b>118</b> positionally holds the top end part of the pressure transmission rod <b>114</b> at the center part of the outer-cylindrical casing <b>112</b> while slidably holding in the axial direction as a slide bearing. Accordingly, the top end face of the measurement rod <b>102</b> can structure a part of the mold cavity <b>2</b> by being attached to the movable die <b>1</b><i>a</i>, as concentrically arranging an end face of the outer-cylindrical casing <b>112</b> at the outermost circumference, an end face of the pressure transmission rod <b>114</b> at the center part, and the porous filter <b>116</b> therebetween. Further, a communication hole <b>119</b> which provides communication between the communication passage <b>115</b> and the porous filter <b>116</b> side is formed at the guide bush <b>118</b>. With the above, gas in the cavity <b>2</b> can be introduced to the communication passage <b>115</b> as being separated from melt at the filter <b>116</b>.

0043Here, the base part of the measurement rod <b>102</b> is attached to the sensor block <b>104</b>. The sensor block <b>104</b> includes a rectangular block body <b>120</b> as illustrated in <figref idref="DRAWINGS">FIG. 2</figref>. A gas introduction chamber <b>122</b> is formed to be opened to one face of the block body <b>120</b> and a first sensor chamber <b>126</b> is formed in line on the same axial center to be opened to an opposite face as sandwiching a partition wall <b>124</b>. A penetration hole <b>128</b> which provides communication between the gas introduction chamber <b>122</b> and the first sensor chamber <b>126</b> is formed at the partition wall <b>124</b>.

0044The measurement rod <b>102</b> is attached to the abovementioned sensor block <b>104</b>. The base end part of the outer-cylindrical casing <b>112</b> is attached to a casing attachment hole <b>122</b><i>a </i>which is formed to be opened at an inlet opening of the gas introduction chamber <b>122</b> and is joined with welding at a corner section between the casing outer circumference and the block body <b>120</b>.

0045A base end of the pressure transmission rod <b>114</b> of the measurement rod <b>102</b> is formed longer than the outer-cylindrical casing <b>112</b>. The base end part is inserted through the penetration hole <b>128</b> and is extended to the first sensor chamber <b>26</b>. The penetration hole <b>128</b> bearing-supports the pressure transmission rod <b>114</b> as sealing clearance against the pressure transmission rod <b>114</b> with an O-ring <b>130</b>. Accordingly, the pressure transmission rod <b>114</b> is movable at the inside of the outer-cylindrical casing <b>112</b> in the axial center direction as being supported at two points by the guide bush <b>118</b> which is arranged at an inner circumference of the top end part of the outer-cylindrical casing <b>112</b> and the penetration hole <b>128</b> which is arranged at the partition wall <b>124</b> of the sensor block <b>104</b>. Owing to that the top end of the pressure transmission rod <b>114</b> receives pressure, the rod is pressed in the axial direction and is moved toward the opening side of the first sensor chamber <b>126</b> of the sensor block <b>104</b>.

0046A pressure sensor <b>134</b> formed into a doughnut-ring shape is attached to an end face of the base end part of the pressure transmission rod <b>114</b> in a state that a pre-load is applied by a center fixing bolt <b>136</b>. Meanwhile, a block cover <b>132</b> which covers the opening of the first sensor chamber <b>126</b> is attached to the sensor block <b>104</b> as being opposed to the base end face of the pressure transmission rod <b>114</b> so that the pressure sensor <b>134</b> is attached as being sandwiched with the pressure transmission rod <b>114</b>. Accordingly, force received by the top end of the pressure transmission rod <b>114</b> is transmitted to the pressure sensor <b>134</b> having an inner face part of the block cover <b>132</b> as a support face, so that the load thereof can be detected. In the embodiment, the pressure sensor <b>134</b> is formed with a piezoelectric type load detection sensor using a ceramic piezoelectric element. With the above, metal pressure of melt filled into the cavity <b>2</b> can be measured.

0047Since the pressure transmission rod <b>114</b> being movable in the axial direction is stopped by the block cover <b>132</b> when pressure is received at the top end, there is substantially no positional movement. However, in a state of no pressure, there is a fear that the pressure transmission rod <b>114</b> moves spontaneously. To prevent the above, a stopper bolt <b>139</b> extended into the first sensor chamber <b>126</b> from an outer face of the sensor block <b>104</b> is attached as illustrated in <figref idref="DRAWINGS">FIGS. 3 and 4</figref>. The stopper bolt <b>139</b> is attached so that the bolt top end is abutted to an outer edge at a front face part of the positioning-performed pressure sensor <b>134</b> to sandwich the pressure sensor <b>134</b> with the block cover <b>132</b>.

0048Meanwhile, the communication passage <b>115</b> formed between the outer-cylindrical casing <b>112</b> and the pressure detection rod <b>114</b> of the measurement rod <b>102</b> is communicated with the gas introduction chamber <b>122</b> at the inside of the sensor block <b>104</b>. As illustrated in <figref idref="DRAWINGS">FIGS. 1 and 2</figref>, a second sensor chamber <b>138</b> communicated with the gas introduction chamber <b>122</b> is formed to be opened to a block outer circumferential face. A gas pressure sensor <b>140</b> is arranged at the opening portion of the second sensor chamber <b>138</b> to hermetically seal the opening portion and the sensor outer face is held by a holding block <b>142</b>. The holding block <b>142</b> is fixed to the sensor block <b>104</b> with bolting. The gas pressure sensor <b>140</b> shaped like a doughnut-ring adopts a piezoelectric type load detection sensor using a ceramic piezoelectric element similarly to the abovementioned pressure sensor <b>134</b> and is fixed to the holding block <b>142</b> in a state that a pre-load is applied by a sensor fixing bolt <b>144</b>. With the above, pressure gas introduced to the porous gas introduction chamber <b>122</b> at the top end of the measurement rod <b>102</b> is exerted to the whole face of the gas pressure sensor <b>140</b> faced to the opening portion of the second sensor chamber <b>138</b>. Accordingly, gas in the cavity <b>2</b> introduced through the porous filter <b>116</b> at the top end side of the measurement rod <b>102</b> is introduced to the second sensor chamber <b>138</b> from the gas introduction chamber <b>122</b> via the communication passage <b>115</b> and pressure thereof can be measured by the gas pressure sensor <b>140</b>.

0049By the way, a purge air introduction hole <b>146</b> is opened to the gas introduction chamber <b>122</b>. A compressed-air supply pipe <b>148</b> is connected to the purge air introduction hole <b>146</b>, so that compressed-air can be supplied from a compressed-air source (not illustrated) outside a system. With the above, clogging of a filter <b>44</b> can be checked as flowing compressed-air to the abovementioned porous filter <b>116</b> side via the gas introduction chamber <b>122</b>. It is checked whether or not the porous filter <b>116</b> is normal for each shot as detecting presence or absence of remaining pressure with the gas pressure sensor <b>140</b> after a specified time after stopping purge air in a state without a product being in a molding cycle. Since air communication is necessarily blocked during molding, it is only required to arrange a check valve (not illustrated) at a passage up to the purge air introduction hole <b>146</b>.

0050Further, a thin hole <b>150</b> is formed at an axial center part of the abovementioned pressure transmission rod <b>114</b>. The thin hole <b>150</b> is formed to reach the vicinity of the top end of the pressure transmission rod <b>114</b> and to have depth leaving slight thickness to be capable of detecting metal pressure with the rod. A sheath type thermocouple <b>152</b> is filled into the thin hole <b>150</b>. The sheath type thermocouple <b>152</b> may adopt a general type in which isolation material is filled into a sheath pipe and wires are embedded thereto. With respect to the sheath type thermocouple <b>152</b>, a detection end is oriented to the top end part side of the pressure transmission rod <b>114</b> and a base end of the sheath pipe is pressed by the top end part of the sensor fixing bolt <b>136</b>. To maintain pressing force, a holddown spring <b>154</b> and a holddown piece <b>156</b> are stored in the thin hole <b>150</b> between the bolt top end of the sensor fixing bolt <b>136</b> and an end part of the sheath pipe of the sheath type thermocouple <b>152</b>. Accordingly, at the same time when the pressure sensor <b>134</b> is fixed by the sensor fixing bolt <b>136</b>, the detection end of the thermocouple <b>152</b> is held at the top end position of the pressure transmission rod <b>114</b> as the holddown piece <b>156</b> being pressed and the sheath pipe being pressed with predetermined force by the holddown spring <b>154</b>. A lead wire <b>158</b> of the sheath type thermocouple <b>152</b> is led to the outside of the block via a cutout groove <b>160</b> which is formed at the base end of the pressure transmission rod <b>114</b>.

0051In the embodiment, a terminal box <b>162</b> is accompanied with the sensor block <b>104</b>. A variety of lead wires of the pressure sensor <b>134</b>, the gas pressure sensor <b>140</b> and the sheath type thermocouple <b>152</b> are introduced thereto. The respective sensors and the like are connected to measurement equipment via the terminal box <b>162</b>, so that predetermined measurement data can be output and, if required, displayed on display means. Here, a lead passage <b>164</b> reaching the first sensor chamber <b>126</b> for leading the lead wire of the pressure sensor <b>134</b> is formed at the sensor block <b>104</b>.

0052In the embodiment, according to the measurement sensor <b>100</b> for mold inside information structured as described above, the measurement rod <b>102</b> is inserted to the attachment hole <b>14</b> which is formed at the movable die <b>1</b><i>a </i>and is fixed at a specified position by the fixing unit <b>110</b> so that the top end face thereof is flush with the cavity <b>3</b> in a state that the mold is opened. In injecting operation after the above attaching is completed, melt is filled into the cavity <b>2</b> and metal pressure of the melt is exerted to the top end of the measurement rod <b>102</b> which is faced to the cavity <b>2</b>. Subsequently, the pressure transmission rod <b>114</b> is pressed, so that the force thereof is detected by the pressure sensor <b>134</b>. Simultaneously, gas in the cavity is introduced to the gas introduction chamber <b>122</b> though the porous filter <b>116</b> via the communication passage <b>115</b> and the gas pressure thereof is detected by the gas pressure sensor <b>140</b>. Further, the sheath type thermocouple <b>152</b> arranged at the top end part of the pressure transmission rod <b>114</b> detects melt temperature. The data of the above is measured by measurement equipment (not illustrated) in chronological order, so that metal temperature, gas pressure in the mold and metal temperature are measured as illustrated in <figref idref="DRAWINGS">FIG. 10</figref>.

0053When mold lubricant is applied to a cavity surface after one shot of injection molding is completed and a product is removed from an opened mold, compressed-air blowing is performed as purge air from the compressed-air supply pipe <b>148</b> to the porous filter <b>116</b> via the gas introduction chamber <b>122</b> and the communication passage <b>115</b>. Accordingly, clogging of the filter <b>116</b> is prevented while preventing the mold lubricant from adhering to the filter <b>116</b>. When detection pressure of the gas pressure sensor <b>140</b> is increased to be higher than atmospheric pressure or pressure including airflow resistance at the time of air purging, it is determined that the filter <b>116</b> is clogged with melt and replacement operation of the filter <b>116</b> may be performed.

0054Here, replacement of the porous filter <b>116</b> is performed as follows. First, the stopper bolt <b>139</b> (see <figref idref="DRAWINGS">FIG. 3</figref>) of the pressure sensor <b>134</b> is released and engagement with the sensor is released. Subsequently, the sensor fixing bolt <b>144</b> is pushed by a push bolt <b>166</b> (imaginary line at the right end in <figref idref="DRAWINGS">FIG. 4</figref>) from an outer face of the block cover <b>132</b> and is moved frontward. Accordingly, the pressure transmission rod <b>114</b> is moved to push the guide bush <b>118</b> and the porous filter <b>116</b> is pushed out from the top end. After performing removal of the above and filter change, a new porous filter <b>116</b> is pushed along with the pressure transmission rod <b>114</b> to be stored in the outer-cylindrical casing <b>112</b>. When the pressure sensor <b>134</b> is moved until being abutted to the block cover <b>132</b>, the stopper bolt <b>139</b> is turned and the bolt top end is engaged with the front face outer edge of the pressure sensor <b>134</b>. In this manner, the replacement operation is completed.

0055Compared to a case that only indirect information can be obtained from a mold surface or a machine as in the related art, according to the measurement sensor <b>100</b> for mold inside information of the first embodiment as described above, owing to direct information of melt which is filled in the cavity <b>2</b>, it is possible to prevent defectives from being fed to a subsequent process while the direct information is used for performing quality determination of casting products. Accordingly, remarkable improvement of yield can be obtained.

0056In the present embodiment, owing to combining integration of a sensor to measure pressure of metal melt, a sensor to measure temperature of melt and a sensor to measure pressure of gas in a cavity compressed with melt filling, the measurement sensor <b>100</b> for mold inside information can be easily attached to and detached from a mold face with high operability. Further, when a monitoring device is appropriately connected to a pressure measurement portion in the cavity <b>2</b> by using the trinity measurement sensor <b>100</b> for mold inside information of metal pressure, gas pressure and metal temperature, it is possible to observe an injection pressure waveform and a gas pressure waveform in the cavity <b>2</b> against a common time axis along with metal temperature information.

0057Detection of metal pressure, gas pressure and metal temperature is performed at a face of the cavity <b>2</b> of the mold movable die <b>1</b><i>a</i>. Here, since the sensor block <b>104</b> including the sensors and the like is located outside of the fixing unit <b>110</b>, that is, at a position being apart from the mold, thermal influence to the sensors and the like can be prevented. Even if length of the measurement rod <b>102</b> is arbitrarily adjusted, sensing operation is not influenced thereby.

0058Further, the pressure sensor <b>134</b> and the gas pressure sensor <b>140</b> being piezoelectric type load detection sensors respectively using a ceramic piezoelectric element are air-cooled as being attached in an open state as not being placed in a hermetically-sealed space. In the light of the above, thermal influence can be avoided as well.

0059The metal temperature measurement is performed at the top end of the pressure transmission rod <b>114</b>. Here, the pressure transmission rod <b>114</b> itself is not structured to be directly contacted to a mold as being thermally disconnected from the outer-cylindrical casing <b>112</b> by the porous filter <b>116</b>, the adiathermic guide bush <b>118</b> and the communication passage <b>115</b>. Therefore, measurement of the metal temperature can be performed without being influenced by mold temperature. Accordingly, metal temperature detection can be performed at high accuracy.

0060The abovementioned embodiments adopt a structural example of a combining type melt sensor. However, it is also possible to structure to separately perform gas pressure detection, metal pressure detection and metal temperature detection in the cavity. Further, it is also possible to structure to combine two kinds of detection functions.

0061Further, the above embodiment is described with an example as being applied to a die-cast machine. However, it is also possible to be applied to a mold of a resin injection molding machine. In this case as well, it is naturally possible to measure cavity gas pressure, resin pressure and resin temperature at the time of injection.

0062Next, a measurement sensor <b>210</b> for mold inside information according to a second embodiment is illustrated in <figref idref="DRAWINGS">FIGS. 6 and 7</figref>. The embodiment adopts a structure in which the measurement sensor <b>210</b> for mold inside information including a sensor portion is attached to a top end of a measurement rod in small chip form.

0063<figref idref="DRAWINGS">FIGS. 6 and 7</figref> illustrate the measurement sensor <b>210</b> for mold inside information (<figref idref="DRAWINGS">FIG. 6</figref>) according to the second embodiment in which the present invention is applied to a die-cast machine and a measurement rod <b>212</b> (<figref idref="DRAWINGS">FIG. 7</figref>) to which the above is attached. Similarly to the abovementioned first embodiment, the measurement sensor <b>210</b> for mold inside information measures variation of metal pressure, gas pressure and temperature in a cavity <b>2</b>.

0064The rod type measurement rod <b>212</b> is attached to a movable die <b>1</b><i>a</i>. As illustrated in <figref idref="DRAWINGS">FIG. 7</figref>, an attachment hole <b>8</b> which reaches the cavity <b>2</b> from a back face thereof is formed at the movable die <b>1</b><i>a </i>(or a fixed die <b>1</b><i>b</i>). The measurement rod <b>212</b> is attached as being inserted from the die back face so that the rod top end is matched with a cavity face. To accept thickness of the movable die <b>1</b><i>a</i>, a fixing unit <b>222</b> which includes a flareless joint <b>218</b> and a locking screw <b>220</b> is slidably attached to an outer circumferential section at a midpoint of a rod-shaped casing <b>216</b> of the measurement rod <b>212</b>. A rod top end position is adjusted to be matched with the face of the cavity <b>2</b> of the mold and the locking screw <b>220</b> is tightened to a female screw portion which is formed at an inlet portion of the attachment hole <b>8</b> of the die <b>1</b><i>a</i>, and then, the flareless joint <b>218</b> is rotated to bite into the casing <b>216</b>. In this manner, the measurement rod <b>212</b> is fixed to a specified position.

0065The measurement sensor <b>210</b> for mold inside information according to the embodiment is arranged at the top end of the measurement rod <b>212</b>. Details of the sensor <b>210</b> are illustrated in a sectional view of <figref idref="DRAWINGS">FIG. 6</figref>. The measurement sensor <b>210</b> for mold inside information includes a cylindrical case <b>224</b> which has the same outer diameter as the rod-shaped casing <b>216</b> and which is concentrically attached as being screwed to the top end part of the rod-shaped casing <b>216</b>. At the inside thereof, the sensor <b>210</b> includes a metal pressure measurement portion, a gas pressure measurement portion and a melt temperature measurement portion.

0066The metal pressure measurement portion is structured as follows. The cylindrical case <b>224</b> includes an end plate portion <b>226</b> being flush with the cavity <b>2</b>, a partition plate portion <b>228</b> being at a rear side, and a space portion (gas introduction chamber) <b>230</b> being formed at an intermediate section of the both. A pressure transmission rod <b>232</b> which is axially supported by the end plate portion <b>226</b> and the partition plate portion <b>228</b> is attached to a center part of the cylindrical case <b>224</b> along the axial center direction as being slidable in the axial direction to be capable of transmitting pressure received from melt ML filled in the cavity <b>2</b> to the rear side. A flange <b>232</b><i>a </i>is arranged at a rear end part of the pressure transmission rod <b>232</b> and the flange <b>232</b><i>a </i>is fitted to a concave portion which is formed at the partition plate portion <b>228</b>. A holding cover <b>234</b> is fixed to a back face (opposite side to the cavity <b>2</b>) of the partition plate portion <b>228</b> with a bolt <b>236</b> to cover the whole back face. A load cell <b>238</b> is attached to the holding cover <b>234</b> at a position faced to the flange <b>232</b><i>a </i>of the pressure transmission rod <b>232</b>. Accordingly, the pressure transmission rod <b>232</b> is capable of measuring metal pressure which is directly received from the melt ML.

0067Instead of the load cell <b>238</b>, it is also possible to adopt a piezoelectric type pressure sensor (heatproof temperature: 300 degrees, measurement melt temperature: 850 degrees or lower, maximum measurement pressure: 200 MPa). Material having a piezoelectric effect enables to place a sensor detection portion at a position being closer to melt also from a structural viewpoint and causes expectation of smaller error factors compared to indirect measurement. By using such a sensor, state variation of melt can be acknowledged from pressure transmission of the melt during the time of being filled, so that pressure holding time and the like can be evaluated.

0068Here, it is also possible to protect the measurement portion side with heat insulation by interposing a heat-insulating ceramic member <b>240</b> at a midpoint of the pressure transmission rod <b>232</b> to insulate heat from the melt ML.

0069Next, the gas pressure measurement portion is structured as follows. A circular concave portion <b>242</b> is formed at a top end face of the end plate portion <b>226</b> to surround a periphery of the pressure transmission rod <b>232</b>. A ring-shaped porous filter <b>244</b> which blocks liquid phase material such as aluminum melt but allows gas to pass through is arranged at the circular concave portion <b>242</b>. For example, the filter <b>244</b> is formed of material such as alumina ceramics and carbon nanotube having fine holes to which metal melt of aluminum or the like does not enter.

0070Further, a communication passage <b>246</b> which is communicated with the space portion <b>230</b> of the cylindrical case <b>224</b> is formed at a bottom plate section of the circular concave portion <b>242</b> to which the filter <b>244</b> is attached. Accordingly, gas introduced from the cavity <b>2</b> through the filter <b>244</b> is introduced to the space portion <b>230</b>. A gas pressure sensor <b>248</b> is attached to the space portion <b>230</b>. In the embodiment, the gas pressure sensor <b>248</b> is fixed to a plate face of the partition plate portion <b>228</b>. Thus, the gas obtained through gas-liquid separation at the filter <b>244</b> is introduced to the space portion <b>230</b> and pressure in the space portion <b>230</b> can be detected as the gas pressure.

0071By the way, a purge air introduction hole <b>250</b> which is communicated with the rod-shaped casing <b>216</b> is formed at the partition plate portion <b>228</b> which forms the space portion <b>230</b> and the holding cover <b>234</b> which is joined thereto. The purge air introduction hole <b>250</b> is connected to a compressed-air source (not illustrated) outside a system. It is checked whether or not the filter <b>244</b> is normal for each shot as detecting pressure with the gas pressure sensor <b>248</b>, while flowing air of which pressure and flow rate are controlled in a state without having a product under the cycle to check clogging of the filter <b>244</b>. Since air communication is necessarily blocked during molding, a check valve <b>252</b> is arranged at the purge air introduction hole <b>250</b>.

0072Further, the structure of measuring metal temperature is as follows. A thin hole <b>254</b> is formed at an axial center part of the pressure transmission rod <b>232</b>. The thin hole <b>254</b> is formed to reach the vicinity of the top end of the pressure transmission rod <b>232</b> and to have depth leaving slight thickness to be capable of detecting metal pressure with the rod. A thermocouple <b>256</b> is attached to the thin hole <b>254</b> to detect melt temperature. The thin hole <b>254</b> is used as a lead passage for a lead wire <b>256</b><i>a </i>of the thermocouple <b>256</b>.

0073Here, lead wires of the load cell <b>238</b>, the gas pressure sensor <b>248</b> and the thermocouple <b>256</b> are connected to measurement equipment outside a system via passages formed at the partition plate portion <b>228</b> and the holding cover <b>234</b> and the rod-shaped casing <b>216</b>.

0074In the embodiment, according to the measurement sensor <b>210</b> for mold inside information structured as described above, the measurement rod <b>212</b> is inserted to the attachment hole <b>8</b> which is formed at the movable die <b>1</b><i>a </i>and is fixed at a specified position by the fixing unit <b>222</b> so that the top end face of the measurement sensor <b>210</b> for mold inside information is flush with the cavity <b>2</b> in a state that the mold is opened. In injection operation after the above attaching is completed, melt is filled into the cavity <b>2</b> and metal pressure of the melt is exerted to the top end of the measurement sensor <b>210</b> for mold inside information which is faced to the cavity <b>2</b>. Subsequently, the pressure transmission rod <b>232</b> is pressed, so that the force thereof is detected by the load cell <b>238</b>. Simultaneously, gas in the cavity is introduced to the space portion <b>230</b> through the filter <b>244</b> and the gas pressure thereof is detected. Further, the thermocouple <b>256</b> arranged at the top end part of the pressure transmission rod <b>232</b> detects melt temperature. The data of the above is measured by measurement equipment (not illustrated) in chronological order, so that metal temperature, gas pressure in the mold and metal temperature are measured as illustrated in <figref idref="DRAWINGS">FIG. 10</figref>.

0075When mold lubricant is applied to a cavity surface after one shot of injection molding is completed and a product is removed from an opened mold, compressed-air flowing is performed on the filter <b>244</b> via the space portion <b>230</b> as purge air. Accordingly, clogging of the filter <b>244</b> is prevented while preventing the mold lubricant from adhering to the filter <b>244</b>. When detection pressure of the gas pressure sensor <b>248</b> is increased to be higher than atmospheric pressure or pressure including airflow resistance at the time of air purging, it is determined that the filter <b>44</b> is clogged with melt and replacement operation of the filter <b>244</b> may be performed.

0076Similarly to a case of the first embodiment, according to the measurement sensor <b>210</b> for mold inside information of the second embodiment, it is possible to directly measure cavity gas pressure, metal pressure and metal temperature of melt filled in the cavity <b>2</b>. Therefore, direct cavity inside information can be obtained and can be used for quality determination of casting products. Accordingly, it is possible to prevent detectives from being fed to a subsequent process and remarkable improvement of yield can be obtained.

0077Further, owing to combining integration of a sensor to measure pressure of metal melt, a sensor to measure temperature of melt and a sensor to measure pressure of gas in a cavity compressed with melt filling, the measurement sensor <b>210</b> for mold inside information can be easily attached to and detached from a mold face with high operability. Further, when a monitoring device is appropriately connected to a pressure measurement portion in the cavity <b>2</b> by using the trinity measurement sensor <b>210</b> for mold inside information of metal pressure, gas pressure and metal temperature, it is possible to observe an injection pressure waveform and a gas pressure waveform in the cavity <b>2</b> against a common time axis along with metal temperature information.

0078Especially, in the second embodiment, since the measurement sensor <b>210</b> for mold inside information is arranged at the top end of the measurement rod <b>212</b> in small chip form, handling thereof is easy and replacement when damaged can be easily performed.

0079Similarly to the first embodiment, in the second embodiment, it is also possible to structure to separately measure metal pressure, gas pressure and metal temperature or to structure to perform measurement with combination of two kinds.

0080By the way, pass/fail criteria are strictly defined in JIS as follows.

A. Determination of Metal Pressure

00811. Maximum value being X % or higher against machine pressure

0082(Example) Pressure raised to be 80% or higher in metal conversion

00832. Being Y % or higher after t seconds

0084(Example) Pressure being 20% or higher after 0.1 second from filling completion

B. Gas Pressure (for Atmospheric Pressure Die-Casting)

00851. Gas pressure being V Pa or lower

0086(Example) Maximum value of gas pressure being 50 Pa or lower

00872. Integrated value of gas pressure being Z cm2 or smaller

0088(Example) Integrated value of gas pressure as gas volume being 80% or lower of cavity volume

C. Gas Pressure (for Vacuum Die-Casting)

00891. Vacuum pressure being W Pa or higher

0090(Example) Maximum value of vacuum being −30 Pa or lower

00912. Integrated value of vacuum pressure being V cm2 or larger

D. Mold Temperature

0092Mold temperature being between upper limit and lower limit inclusive of temperature amplitude

0093In the present embodiment, since measurement for the above determination criteria can be performed directly from melt, reliable measurement data can be obtained.

INDUSTRIAL APPLICABILITY

0094The present invention achieves remarkable contribution to quality stabilization as providing a sensor capable of performing product quality determination while monitoring the inside of mold cavity at the time of molding with a die-cast machine or a resin injection machine.

REFERENCE SIGNS LIST

0000<ul id="ul0002" list-style="none"><li id="ul0002-0001" num="0095"><b>1</b><i>a </i>Movable die</li><li id="ul0002-0002" num="0096"><b>1</b><i>b </i>Fixed die</li><li id="ul0002-0003" num="0097"><b>2</b> Cavity</li><li id="ul0002-0004" num="0098"><b>3</b><i>a </i>Sprue</li><li id="ul0002-0005" num="0099"><b>3</b><i>b </i>Runner</li><li id="ul0002-0006" num="0100"><b>3</b><i>c </i>Gate</li><li id="ul0002-0007" num="0101"><b>4</b> Air vent</li><li id="ul0002-0008" num="0102"><b>5</b> Overflow</li><li id="ul0002-0009" num="0103"><b>6</b> Plunger sleeve</li><li id="ul0002-0010" num="0104"><b>6</b><i>a </i>Pouring port</li><li id="ul0002-0011" num="0105"><b>7</b> Plunger</li><li id="ul0002-0012" num="0106"><b>7</b><i>a </i>Plunger tip</li><li id="ul0002-0013" num="0107"><b>100</b> Measurement sensor for mold inside information</li><li id="ul0002-0014" num="0108"><b>102</b> Measurement rod</li><li id="ul0002-0015" num="0109"><b>104</b> Sensor block</li><li id="ul0002-0016" num="0110"><b>106</b> Flareless joint</li><li id="ul0002-0017" num="0111"><b>108</b> Locking screw</li><li id="ul0002-0018" num="0112"><b>110</b> Fixing unit</li><li id="ul0002-0019" num="0113"><b>112</b> Outer-cylindrical casing</li><li id="ul0002-0020" num="0114"><b>114</b> Pressure transmission rod</li><li id="ul0002-0021" num="0115"><b>115</b> Communication passage</li><li id="ul0002-0022" num="0116"><b>116</b> Porous filter</li><li id="ul0002-0023" num="0117"><b>118</b> Guide bush</li><li id="ul0002-0024" num="0118"><b>119</b> Communication hole</li><li id="ul0002-0025" num="0119"><b>120</b> Block body</li><li id="ul0002-0026" num="0120"><b>122</b> Gas introduction chamber</li><li id="ul0002-0027" num="0121"><b>122</b><i>a </i>Casing attachment hole</li><li id="ul0002-0028" num="0122"><b>124</b> Partition wall</li><li id="ul0002-0029" num="0123"><b>126</b> First sensor chamber</li><li id="ul0002-0030" num="0124"><b>128</b> Penetration hole</li><li id="ul0002-0031" num="0125"><b>130</b> O-ring</li><li id="ul0002-0032" num="0126"><b>132</b> Block cover</li><li id="ul0002-0033" num="0127"><b>134</b> Pressure sensor</li><li id="ul0002-0034" num="0128"><b>136</b> Sensor fixing bolt</li><li id="ul0002-0035" num="0129"><b>138</b> Second sensor chamber</li><li id="ul0002-0036" num="0130"><b>139</b> Stopper bolt</li><li id="ul0002-0037" num="0131"><b>140</b> Gas pressure sensor</li><li id="ul0002-0038" num="0132"><b>142</b> Holding block</li><li id="ul0002-0039" num="0133"><b>144</b> Sensor fixing bolt</li><li id="ul0002-0040" num="0134"><b>146</b> Purge air introduction hole</li><li id="ul0002-0041" num="0135"><b>148</b> Compressed-air supply pipe</li><li id="ul0002-0042" num="0136"><b>150</b> Thin hole</li><li id="ul0002-0043" num="0137"><b>152</b> Sheath type thermocouple</li><li id="ul0002-0044" num="0138"><b>154</b> Holddown spring</li><li id="ul0002-0045" num="0139"><b>156</b> Holddown piece</li><li id="ul0002-0046" num="0140"><b>158</b> Lead wire</li><li id="ul0002-0047" num="0141"><b>160</b> Cutout groove</li><li id="ul0002-0048" num="0142"><b>162</b> Terminal box</li><li id="ul0002-0049" num="0143"><b>164</b> Lead passage</li><li id="ul0002-0050" num="0144"><b>166</b> Push bolt</li><li id="ul0002-0051" num="0145"><b>210</b> Measurement sensor for mold inside information</li><li id="ul0002-0052" num="0146"><b>212</b> Measurement rod</li><li id="ul0002-0053" num="0147"><b>214</b> Attachment hole</li><li id="ul0002-0054" num="0148"><b>216</b> Rod-shaped casing</li><li id="ul0002-0055" num="0149"><b>218</b> Flareless joint</li><li id="ul0002-0056" num="0150"><b>220</b> Locking screw</li><li id="ul0002-0057" num="0151"><b>222</b> Fixing unit</li><li id="ul0002-0058" num="0152"><b>224</b> Cylindrical case</li><li id="ul0002-0059" num="0153"><b>226</b> End plate portion</li><li id="ul0002-0060" num="0154"><b>228</b> Partition plate portion</li><li id="ul0002-0061" num="0155"><b>230</b> Space portion</li><li id="ul0002-0062" num="0156"><b>232</b> Pressure transmission rod</li><li id="ul0002-0063" num="0157"><b>232</b><i>a </i>Flange</li><li id="ul0002-0064" num="0158"><b>234</b> Holding cover</li><li id="ul0002-0065" num="0159"><b>236</b> Bolt</li><li id="ul0002-0066" num="0160"><b>238</b> Load cell</li><li id="ul0002-0067" num="0161"><b>240</b> Heat-insulating ceramic member</li><li id="ul0002-0068" num="0162"><b>242</b> Circular concave portion</li><li id="ul0002-0069" num="0163"><b>244</b> Filter</li><li id="ul0002-0070" num="0164"><b>246</b> Communication passage</li><li id="ul0002-0071" num="0165"><b>248</b> Gas pressure sensor</li><li id="ul0002-0072" num="0166"><b>250</b> Purge air introduction hole</li><li id="ul0002-0073" num="0167"><b>252</b> Check valve</li><li id="ul0002-0074" num="0168"><b>254</b> Thin hole</li><li id="ul0002-0075" num="0169"><b>256</b> Thermocouple</li></ul>