Sheet metal finished by continuous hair-line on its plane and curved surface and apparatus and method for finishing by continuous hair-line on the same

A metal sheet in which a hairline is continuously processed over a curved surface and a flat surface, and an apparatus and method for continuous hairline processing of a metal sheet including a curved surface and a flat surface. BY CONTINUOUS HAIR-LINE ON THE SAME}

1 is a perspective view showing an embodiment of a metal plate in which a hairline is continuously processed over a curved surface and a flat surface according to the present invention;

2 is a front view of an embodiment of a continuous hairline processing apparatus according to the present invention;

Figure 3 is a cross-sectional view of the holder unit of the embodiment of Figure 2;

4 is a cross-sectional view of a part of a holder unit of another embodiment of a continuous hairline processing apparatus according to the present invention;

5 is a front view of another embodiment of a continuous hairline processing apparatus according to the present invention;

Figure 6 is a cross-sectional view of the holder unit portion of the embodiment of Figure 5;

7 is a flowchart of an embodiment of a method for processing a continuous hairline according to the present invention.

<Explanation of symbols for main parts of the drawing>

50: metal plate 110, 210: sandpaper

121, 122, 123: rotary roller 130, 230: holder unit

140: pressure unit 160, 260: vibration prevention means

270: magnet

<backgroundart><p>The present invention relates to hairline processing, and more particularly, to a metal sheet including both a curved surface and a flat surface, and having a hairline continuously processed over the curved surface and plane, and a metal sheet including a curved surface and a flat surface, continuous hair It relates to a processing apparatus and method for performing line processing.</p><p>Metal materials have a unique metallic luster, so they have a beautiful appearance and are superior in strength and durability compared to other materials, so the scope of use is continuously expanding. In recent years, a metal material is also selected as a plate material for forming the outer periphery of a portable electronic product such as a mobile communication terminal. That is, a molded metal plate is used as a material for a case, a housing, or the like of a portable electronic product.</p><p>However, in order for a metal material to have its own luster, the surface can be polished and used, but a single metallic luster has a problem of giving a rather monotonous feeling. In particular, in products where external design is important, such as mobile communication terminals, surface treatment methods for metal plates are being developed so that they can meet various demands of consumers while finishing the exterior with metal plates.</p><p>As one of these methods, a metal plate material to exhibit a decorative effect by forming a fine straight hairline on the surface has been developed and used. This hairline processing is to form a fine line in a straight line by rubbing sandpaper or a steel brush on the surface of a metal plate that has been polished smoothly. there is this</p><p>However, such hairline processing is performed in such a way that the operator manually rubs the metal plate against the rotating sandpaper or brush. Therefore, hairline processing takes a lot of work time, resulting in low productivity, and since the spacing and length of the hairline formed as a result of processing vary depending on the skill and function of the operator, there is a problem that the quality of the final finished product cannot be kept constant. have.</p><p>Furthermore, there are many examples of products that users always carry, such as mobile communication terminals, in which a curved portion and a flat portion are mixed on the outer surface. It is very difficult to process a plate material. In particular, when a curved surface connects between one plane and another, it is virtually impossible for even skilled workers to continuously form a uniform hairline from one plane to another through the curved surface.</p><p>On the other hand, in the case where the hairline is first processed on one surface of the flat metal plate and then the metal plate is formed into a curved surface through a post process such as press processing, the hairline disappears by pressing during the pressing process, or the curved part is stretched There is a problem in that the spacing of the hairline is changed or the appearance is damaged by the characteristic whitening phenomenon of the metal material.</p><p>Therefore, for a metal sheet having a shape in which a curved surface and a flat surface are mixed, hairline processing is performed only on some planes capable of hairline processing, and there are many examples of giving up hairline processing on curved surfaces. That is, a metal plate material including both a curved surface and a flat surface has a hairline formed only on the plane thereof, and a metal sheet material having a continuous hairline even on a curved surface has not been developed. This is because there is no known device or method capable of continuously processing hairlines from flat to curved surfaces.</p></backgroundart><abstractproblem><p>The present invention has been devised to solve the problems of the prior art as described above, and an object of the present invention is to provide a metal sheet having a continuous hairline formed over a curved surface and a flat surface.</p><p>Another object of the present invention is to provide a continuous hairline processing apparatus and method capable of forming a continuous hairline on a metal sheet including both a curved surface and a flat surface.</p><p>Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings.</p></abstractproblem>

<p>In order to achieve the above object, the metal sheet having a hairline continuously processed over a curved surface and a flat surface according to the present invention is a metal sheet having a part curved surface and another part flat surface, wherein the curved surface and the plane in contact with the curved surface are in contact with the curved surface. It is characterized in that the hairline is continuously formed throughout.</p><p>A continuous hairline processing apparatus according to the present invention includes: sandpaper having an annular belt shape; a plurality of rotating rollers for circulating and rotating the sandpaper to form a closed curve in a vertical plane; a holder unit disposed between a pair of adjacent rotary rollers among the plurality of rotary rollers, and a rotary roller adjacent to the holder unit and the holder unit, and pressing the rotating sandpaper to the outside of the closed curve It consists of a compression unit.</p><p>In the continuous hairline processing apparatus according to the present invention, it is preferable that at least one rotating roller among the plurality of rotating rollers is operated in the inner and outer directions of the closed curve to adjust the tension of the sandpaper.</p><p>The continuous hairline processing apparatus according to the present invention may further include an anti-shake means located on the upstream side of the holder unit based on the circulation direction of the sand paper, and preventing shaking by contacting the sand paper. In this case, the anti-shake means preferably includes a roller contacting the sandpaper from the inside of the closed curve.</p><p>In addition, in the continuous hairline processing apparatus according to the present invention, it is preferable that a pair of the pressing unit is installed, one on each side of the holder unit as a center. In this case, it is possible to process a continuous hairline even for a metal plate including curved surfaces on both sides. On the other hand, the pressing unit, a hydraulic cylinder that is stretched and contracted toward the outside of the closed curve, and a pressing roller that is rotatably installed on the rod of the hydraulic cylinder and comes into contact with the sandpaper from the inside of the closed curve.</p><p>In the continuous hairline processing apparatus according to the present invention, the holder unit includes a support part into which the metal plate is fitted, and an X-Y table for moving the support part in a plane, and a lifting part for raising and lowering the support part in a vertical direction. may include more. When the holder unit includes the lifting unit, it is preferable to further include a fixed block fixedly installed inside the closed curve to regulate the top dead center of the lifting unit. In addition, the holder unit may further include a spring for elastically supporting the support part.</p><p>On the other hand, the continuous hairline processing apparatus according to the present invention comprises: sandpaper coated with ferromagnetic powder and having an annular belt shape; It may include a holder unit that supports the sandpaper in contact with the lower surface, and a magnet installed in the holder unit. In this case, it is preferable that the holder unit includes a support part into which the metal plate is fitted, and an X-Y table for moving the support part in a plane, and the magnet is interpolated into the support part.</p><p>The continuous hairline processing method according to the present invention comprises the steps of circulating and rotating sandpaper in the shape of an annular belt while drawing a closed curve including a straight section; Disposing so as to be in contact with, and the step of bending the sandpaper downward at a point adjacent to the metal plate.</p><p>In the continuous hairline processing method according to the present invention, the step of downwardly bending the sandpaper is preferably located inside the closed curve drawn by the sandpaper, and downwardly pressing the sandpaper by lowering the pressing unit operated up and down. Alternatively, the step of downwardly bending the sandpaper may be characterized in that a magnetic field is formed in the metal plate while the ferromagnetic powder is applied to the sandpaper.</p><p>Hereinafter, a preferred embodiment of the continuous hairline processing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.</p><p>1 is a perspective view showing an embodiment of a metal plate material in which a hairline is continuously processed over a curved surface and a flat surface according to the present invention.</p><p>The metal plate 50 includes, for example, flat surfaces 51 and 53 and flat surfaces 52 like the case of the mobile communication terminal shown in FIG. 1, and is made of a metal material such as stainless steel, magnesium, duralumin, and aluminum It is a molded plate material. In particular, a curved surface 52 is present between the plane 51 of the upper surface portion of the metal plate 50 and the flat surface 53 of the side portion, and from the flat surface 51 of the upper surface portion through the curved surface 52 to the flat surface 53 of the side portion. The hairline 55 is continuously formed until up to.</p><p>Figure 2 is a front view of an embodiment of the continuous hairline processing apparatus according to the present invention, Figure 3 is a cross-sectional view of the holder unit of the embodiment of Figure 2.</p><p>The metal plate 50 is as illustrated in FIG. 1 , and is in a state before the hairline is formed. That is, it is loaded into a continuous hairline processing apparatus in a semi-processed state to give a uniform metallic luster by conventional polishing or the like.</p><p>The sandpaper 110 is formed by applying an abrasive to one surface of a base material such as cloth, has flexibility, and has an annular belt shape.</p><p>A plurality of rotary rollers 121, 122, and 123 are provided, and the sandpaper 110 circulates and rotates while forming an arbitrary closed curve in a vertical plane. That is, as shown in FIG. 2, the sandpaper 110 is placed between the first rotating roller 121 and the second rotating roller 122, and the first rotating roller 121 by a rotating driving means such as an electric motor. When the second rotating roller 122 is allowed to rotate freely while rotating the , the sandpaper 110 continuously circulates between the two rotating rollers 121 and 122 and rotates. On the other hand, the third rotary roller 123 is added and installed within the closed curve formed by the sandpaper 110, and the third rotary roller 123 is operated in the inside and outside directions of the closed curve to adjust the tension of the sandpaper 110. desirable.</p><p>The holder unit 130 supports the metal plate material 50, so that the upper surface of the metal plate material 50 is in contact with the lower surface of the sandpaper 110 that is continuously circulating. To this end, the holder unit 130 is disposed between a pair of adjacent rotating rollers 121 and 122 among the plurality of rotating rollers 121, 122, 123, and on the other hand, the metal plate 50 is moved in a horizontal plane. Or, it is preferable to be able to elevate in the vertical direction. When the holder unit 130 moves the metal plate 50 in a horizontal plane, it is easy to move the metal plate 50 to the lower surface of the sandpaper 110 after fixing the metal plate 50 to the holder unit 130 at the start of processing , Even during processing, if necessary, a hairline can be formed while moving the metal plate 50 in the width direction or the length direction of the sandpaper 110, so that the convenience of the processing operation is improved. In addition, the holder unit 130 elevates the metal plate 50 in the vertical direction also facilitates moving the metal plate 50 to the lower surface of the sandpaper 110, and furthermore, the sandpaper 110 and the metal plate ( Since the contact pressure between the 50) can be adjusted, the quality such as the density and length of the hairline to be formed on the metal plate 50 can be adjusted. Therefore, the holder unit 130 includes a support part 131 that can be supported by sandwiching the metal plate 50, an X Y table 132 that moves the support part 131 in a plane, or the support part 131 in the vertical direction. It is configured to include a lifting unit 133 for elevating to the. The holder unit 130 may include the X Y table 132 and the support part 133 at the same time. Furthermore, in a state in which the holder unit 130 does not move the metal plate material in the vertical direction, it is more preferable to elastically support the support part 131 so that the contact between the sandpaper 110 and the metal plate material 50 can be elastically maintained. do. To this end, a spring 135 as an elastic member is installed between the support part 131 and the X Y table 132 or the elevating part 133 . The spring 135 is installed in the lower part of the X Y table 132 or the lifting unit 133 so that the entire holder unit 130 is elastically supported with respect to the floor surface or a separate frame on which the present invention is to be installed. . In addition, in order to strengthen and stably maintain the contact pressure between the sandpaper 110 and the metal plate 50, a fixed block ( 134) is preferred.</p><p>The pressing unit 140 is installed to press the sandpaper 110 from the inside to the outside of the closed curve formed by the sandpaper 110 . That is, the pressing unit 140 is disposed between the holder unit 130 and any one of the rotary rollers 121 adjacent thereto. When the upper surface is brought into contact, the sandpaper 110 is pressed downward. As shown in FIG. 3 , when the pressing roller 142 as the pressing unit 140 presses the sandpaper 110 to a point lower than the upper surface of the metal plate 50 fixed to the holder unit 130 , the sandpaper 110 . is progressed while forming a curved surface connecting the upper surface of the holder unit 130 and the lower end of the pressing roller 142 . Therefore, in the side portion of the metal plate 50, the sandpaper 110 is curved and proceeds, and in the upper surface of the metal plate 50, the sandpaper 110 proceeds in a straight line, so the flat and curved surfaces of the metal plate 50 A continuous hairline can be processed on the part. In order to control the degree of curvature of the sandpaper 110, it is necessary to adjust the degree to which the pressing unit 140 descends. The pressing unit 140 includes a contact in contact with the sandpaper 110, and the contactor in a straight direction. It is preferable to include a movable structure. For example, a guide shoe is installed on the contactor, and a guide rail for guiding the guide shoe is installed, but the pressure unit 140 can be implemented by manually moving the contactor up and down and fixing it at an appropriate point. At this time, since the contactor is in direct contact with the sandpaper 110, it is preferable that the contactor is a pressing roller 142 having a roller shape in order to minimize damage to the sandpaper 110 due to friction. Furthermore, in order to enable the automatic operation of the pressing unit 140, it is preferable to install the pressing roller 142 at the end of the rod of the hydraulic/pneumatic cylinder 141 that is contracted and operated. Since the pressing unit 140 can change the degree of curvature of the sandpaper 110 , even if the curvature of the curved surface formed on the metal plate 50 changes, the degree of curvature of the sandpaper 110 can be adjusted accordingly.</p><p>Meanwhile, vibration may occur in the sandpaper 110 depending on the speed at which the sandpaper 110 circulates. When the sandpaper 110 comes into contact with the metal plate 50 while vibrating, since the hairline formed on the metal plate 50 has an irregular shape, it is necessary to suppress the vibration of the sandpaper 110 . The vibration of the sandpaper 110 increases as the distance between each rotating roller 121 , 122 , 123 increases and the circulation speed of the sandpaper 110 increases. Therefore, it is preferable to arrange the anti-vibration means 160 for preventing the vibration of the sandpaper 110 on the upstream side of the holder unit 130 . The upstream side of the holder unit 130 is based on the circulation direction of the sandpaper 110 , and before the sandpaper 110 enters the holder unit 130 , it comes into contact with the vibration prevention means 160 to reduce vibration. means you have to As shown in FIG. 2, the anti-shake means 160 may be a bar having a curved surface in contact with the sandpaper 110, but also to minimize damage to the sandpaper 110 by contact friction. It is preferred to include an idle roller.</p><p>In the above, the metal plate material 50 is exemplified as having a curved surface formed on only one side with respect to the moving direction of the sandpaper 110, but in some cases curved surfaces are formed on both sides in some cases. 4 is a cross-sectional view of a holder unit portion of another embodiment of the continuous hairline processing apparatus according to the present invention, illustrating an embodiment of processing the metal plate material 50' having curved surfaces on both sides. In this case, by arranging one pressing unit on each side with respect to the holder unit 130 , that is, by placing the pressing rollers 142 and 152 on both sides of the support part 131 of the holder unit 130 , respectively. A hairline may be formed on both curved surfaces of the plate material 50'. A pair of pressing units have the same configuration and action, only different in their installation positions.</p><p>Figure 5 is a front view of another embodiment of the continuous hairline processing apparatus according to the present invention, Figure 6 is a cross-sectional view of the holder unit portion of the embodiment of Figure 5.</p><p>In this embodiment, the magnet 270 is provided on the support part 231 of the holder unit 230 instead of the pressing unit 140 of the previous embodiment being omitted. The magnet 270 may be a permanent magnet or an electromagnet. In addition, the sandpaper 210 is coated with a material that adheres to the magnet, that is, a ferromagnetic powder. Since the ferromagnetic powder is applied, the sandpaper 210 is attracted by the magnetic force of the magnet 270 and is in close contact with the support 231 of the holder unit 230, and the flat surface of the metal plate 50 inserted into the support 231 as well as It proceeds while also touching the curved surface. As a result, the metal plate material 50 is formed with a continuous hairline from a flat surface to a curved surface.</p><p>In this embodiment, the sandpaper 210, the rotary rollers 221, 222, 223, the holder unit 230, and the anti-shake means 260 have the same configuration and action as the corresponding configuration of the previous embodiment, respectively, within the limits not described separately. , so a detailed description thereof will be omitted.</p><p>7 is a flowchart of an embodiment of a method for processing a continuous hairline according to the present invention.</p><p>In order to continuously process a hairline for a metal sheet having a mixed curved surface and a flat surface, first, sandpaper in the shape of an annular belt is circulated and rotated while drawing a closed curve having a straight section (S110).</p><p>The metal plate to be processed is arranged so that its upper surface is in contact with the sandpaper under the circulating sandpaper (S120). At this time, the metal plate is a plate molded product including both curved and flat surfaces. In addition, the position where the metal plate is in contact with the sandpaper should be a straight section among the closed curves drawn by the sandpaper.</p><p>In a state where the metal plate is in contact with the sandpaper, the sandpaper is bent downward at a point adjacent to the metal plate (S130). As a specific method of bending the sandpaper downward as described above, it is possible to press the sandpaper downward by lowering the pressing unit that is located inside the closed curve drawn by the sandpaper and operates up and down. Alternatively, a strong magnetic field may be formed on the metal plate, but the sandpaper may be drawn toward the metal plate by magnetic force by applying a powder made of a ferromagnetic material to the sandpaper. That is, instead of bending the sandpaper by physical contact, the sandpaper is curved by magnetic force.</p><p>Through this process, the sandpaper is curved and in contact with the curved surface as well as the flat surface of the metal plate, so that the metal plate has a continuous hairline over the plane and the curved surface.</p><p>One embodiment of the present invention described above and shown in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can improve and change the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the protection scope of the present invention as long as it is apparent to those of ordinary skill in the art.</p>

<p>As described above, in the continuous hairline processing apparatus according to the present invention, since the sandpaper is curved and proceeds, a hairline can be formed on the curved surface of the metal sheet. </p><p>In addition, since the degree to which the sandpaper is curved can be varied by operating the pressing unit, it is possible to continuously form a hairline even on a metal sheet including a curved surface having a different curvature.</p><p>On the other hand, since the sandpaper is flexible and deforms according to the curvature of the metal plate, it can be in contact with the entire surface of the metal plate including both curved and flat surfaces, and a continuous hairline can be formed over the entire surface of the metal plate. can</p>