Injection-moulding machine with at least two plasticising and injection units.

The invention relates to an injection molding machine having at least two plasticizing and injection units, with a fixed mold platen and a guided by fixed rails movable mold clamping plate, the have a mold halves of injection molds, and with a therebetween a mold halves about its axis rotatable and towards the fixed rails sliding prismatic core support body whose his Axis parallel side faces the other form comprise halves of injection molds.

Injection molding machines with two plasticizing and injection units and a prismatic support body are known (DE-PS 12 15 353).

For injecting plasticized material, the per Weil opposing mold halves of the two mold platens and the prismatic body forming brought by closed molds to rest, where one injection mold a molded lost core has, which has been injected in the previous injection cycle, while the other injection mold is empty.

After injecting plasifiziertem material equal time through the two plastifying and injection units he follows, has one injection a finish Flocked Injection molding, and the other injection mold a lost Core.

Then, the molds are opened by the movable platen on the fixed rails will act accordingly. As between the mold clamping plates and the guides for the prismatic support body on the stays are arranged compression springs, are the corresponding displacement of the movable platen automatically open the molds, so that the prism matic body can be pivoted. He is so pivoted, that the lost core together with its mold in the Posi tion of the mold half with the lost core of the previous Injection cycle is pivoted. Subsequently, by ent Talking process of movable platen with the formation of molds facing each other brought stationary mold halves in the closed position and turn injected material, so that again a finished injection articles and a lost core are injected simultaneously.

By processing of different plastic material with the two plasticizing and injection units can injection products are prepared, the two areas of different have material properties and various colors.

The one plasticizing and injection unit forms with the movable platen to a Holmen guided displaceable structural unit, while the other Plasticizing and injection unit with the fixed die platen cooperates.

For closing and opening of the respective one of the mold halves to forming molds serves as a closing unit Toggle joint, which is displaceable in the plasticizing and Injection unit and articulated on the machine frame, and by means of is a hydraulic ram acted upon.

The axis of the prismatic supporting body is in two guiding mounted sleeves rotatable Move to the fixed rails arranged bar. Between these sleeves and the mold clamping plates are arranged the aforementioned compression springs.

The prismatic support body has perpendicular to its axis the outline of a regular hexagon, with its for carry mold halves axis direction parallel side surfaces and its axis horizontal and perpendicular to its motion direction, ie, perpendicular to the uprights.

This injection molding machines have considerable disadvantages:

Generally, for injection molding, the aim is the kinetic energy to be moved on the rails to hold mass as low as possible, since the total mass of the one end position, ie, the maximum open position of Molds from the rest position as soon as possible on a , Is to accelerate predetermined maximum speed the then up to the level of the mold safety point constant is to keep it from then braking of the entire mass so takes place, that the molds closed under creep will. It is obvious that the shortest possible injection cycle times with minimum distances to accelerate Total mass from the rest position to the maximum VELOCITY speed and with the smallest possible distance to go from the mold closing backup point to the closed position of the molds synonymous are with the smallest possible mass to be accelerated.

A reduction of the total mass to be moved at this Injection molding machines but so far does not have the goal of since the carrier body with its sleeves and the compression springs between the platens during dynamic motion sequences with them forms a damped oscillatory system and its mold halves against the mold halves of the mold platens bounce, when the time is not sufficient for the injection cycles is dimensioned in length so that the injection cycles of the injection molding machines compared to the injection cycle of modern machines, between the platens only the mold halves arranged by injection molding, is too long. open view Lich is here one of the reasons why this injection machines with an additional prismatic support body between the platens so far have not been successful.

Based on these considerations, the invention is the task based injection molding machines of this type in such a way, that the closing of the injection molds under Kriechgeschwindig speed is ensured and the injection cycles are as short as possible and injection molded articles be produced, the more than two sections of plastic material with different material properties and / or shade variations or tones or alternately having transparent and opaque regions.

This object is achieved in that ver sliding rails of the movable platen are performed, the prismatic supporting body in the region between the two platens in the sliding rails is rotatably mounted, on the side remote from the carrier body Side of the movable platen, at least one Drive for the two displaceable spars is arranged, the movable platen at least one gate channel which, in a direction parallel to their movement Side surface opens, and that the one plasticizing and injection unit with this runner is engageable. By these measures it is achieved that the sliding Formauf chipboard for the prismatic support body function a fixed platen, has been with the clamped mold halves, the mold halves of the support body, so to speak, the function of a sliding Formauf chipboard has to cooperate. Because of this principle it is possible that movement of the carrier body exactly to control, in such a way that the in each case depending the position of the carrier body for forming molds always under creep are closed, it is entirely irrelevant whether the clamped on the support body halves form an equal or may have a different height. To ensure, that the molds formed always under Kriechgeschwin speed to be closed, it is necessary for the movement the sliding bars to control accordingly. in principle can for each of these movable spars on the of the Support body side facing away from the sliding Formauf chipboard a drive, for example a correspondingly controlled stepper motor to be provided, the program the height of the mold clamped onto the carrier body mold halves considered, being understood from an output position of the carrier body can be assumed, and the respective Angle of rotation of the support body is an indication that spanned mold with the mold half of the displaced Clamping plate is disposed opposite. The same of course applies to the assignment of the spanned Mold halves of the prismatic body to the fixed on the Platen mounted mold half. Instead of a drive for each beam can also be a single drive for both ver sliding spars are provided in such a manner that the displaced from Holme on the prismatic support body facing side are connected by a crossbar and between the crossbar and the side facing away from the carrier body provided the movable platen drive is of a hydraulic or pneumatic cylinder can be. After closing of the sliding of the on the Platen mounted mold half and the opposite horizontally arranged mold half of the carrier body formed Injection mold with a known clamping unit the sliding of the platen and the carrier body formed displaceable unit toward the fixed platen method, wherein in at known manner shortly before reaching the closed position of the of the clamped mold halves of the prismatic body and the plane defined on the fixed platen mold defined injection the remaining movement under creep speed runs. Because the in complete abandonment prior art on the movable platen no Plasti fizier- and injection unit is arranged, which necessarily are moved with the movable platen would, the entire mass to be moved is considerably reduced and lies in the same order of magnitude as with the known Injection molding machines, which between the mold mounting plates comprise only molds.

After closing the molds is that of displaced Platen associated plasticizing and injection unit ge with the runner in the mold clamping plate engaged introduced with the prior in complete abandonment Technology these plasticizing and injection unit arranged is that in closed position of the injection molds with the Runner is engaged, also in complete Departure from the prior art is arranged so, that it in a direction for movement of the displaceable mold platen parallel side face opens, the Plasti fizier- and injection unit according to the invention also in the to the movement direction of the displaceable mold clamping plate vertical direction is slidably mounted.

According to the invention, the movable platen at least one certified according to the invention in this manner Runner on. You can basically three such runners exhibit, each separated into motion angled direction of the movable platen exhibit section that in in a known manner the Mold cavity, but in the present case independently open, so that it is possible, for example, on three sides of lost core plasticized material under production the finished injection molded article to mold.

In the simplest case of the prismatic support body has vertically to its axis and a square outline, it can also be a Outline of an irregular <i>N</i>have -Eckes, and only the is to satisfy a condition that the diametrically opposite side faces of the prismatic body in parallel, and in the closed position of the molds in parallel to the Platens are.

In one embodiment of the invention has the pris matic body the outline of at least one square, the displaceable spars are guided in a vertical plane and in the closed position of the set on the platens clamped mold halves with the associated mold halves of pris angeord matic body on additional platens designated mold halves with further mold halves of the prismatic Kör pers and with other plasticizing and injection units in Engageable. By these measures it is achieved that In addition, other plastifying and injection units to ordered further platens and mold halves in a rate can be accommodated, so that, for example, during a Injection cycle, the number of finished molded products can be substantially increased. It is also possible, during the same injection cycle additionally further plasticized Art fabric material with other material properties in the spray foundry molds inject so that at the end of the injection cycle sprayed in several files Splashes molded articles an ent Speaking large number of different material regions respectively Sections of different material properties.

In a further embodiment of the invention, the drive is for the sliding rails of the working cylinder for the ejector, wherein the working cylinder on the prismatic body of the opposite side of the movable platen and between the sliding rails connecting Traverse is arranged.

In another embodiment of the invention, the fixed stationary plate and the movable platen on the facing sides in each case a toothed rack, wherein between the two racks meshing with a pinion them is arranged, the axis of the pinion with the slidable Holmen and the support body arranged displaced jointly is and the transmission ratio of the toothed racks and the pinion is chosen so that the distance between the open mold halves the movable platen and the prismatic Support body half, displaced by the mold clamping plate covered on the Holmen way between its two End positions is.

By these measures it is achieved that in the end position the movable platen, to the maximum from was the mold halves of the open molds ent speaks, the carrier body is in the middle between the ver sliding and the fixed platen is.

The invention is based on exemplary embodiments in the drawing calculations explained. It shows

<b>Fig.</b> 1 shows a first embodiment,

<b>Fig.</b> 2 is a plan view of the embodiment in <b>Fig.</b> 1,

<b>Fig.</b> 3 is a side view of a second embodiment,

<b>Fig.</b> 4 is a plan view of the embodiment in <b>Fig.</b> 3,

<b>Fig.</b> 5 shows a further embodiment of a carrier body and

<b>Fig.</b> 6 in representation of the <b>Fig.</b> 1 shows an embodiment for controlling the position of the carrier body in Depending on the position of the sliding Formauf chipboard.

<b>Fig.</b> 1 shows a side view of the first embodiment. On a machine frame, not shown, two are fixed de plates <b>1</b> and <b>2</b> arranged.

The plate <b>1</b> simultaneously forms the fixed platen for a mold half <b>3</b>Which in a conventional manner a form nest <b>4</b> having.

The fixed platen further comprises a sprue drilling <b>5</b> via which in a known manner in the Off cut plasticizing and injection unit shown <b>6</b>, the plasticized plastic material is injected.

The plates <b>1</b> and <b>2</b> form with an upper pair of bars <b>7</b> and a lower pair of bars <b>8th</b> a guide for the sliding Formauf chipboard <b>9</b>Which at its the fixed platen <b>1</b> side facing a mold half <b>10</b> having. Of the two Holm pairs in <b>Fig.</b> 1, only one visible Holm.

The movable platen <b>9</b> performs two spars <b>11</b> and <b>12</b>. in any position on the movable platen <b>9</b> are led out on both sides.

In the area between the two mold mounting plates, ie in the Area between the mold halves <b>3</b> and <b>10</b> is at the two ver sliding rails a core carrier body <b>13</b> in the camps <b>14</b> ver rotatably disposed. It has, perpendicular to its axis<b>15</b> the Cross section of a prismatic body, in this case a regular rectangle on.

At about the axis <b>15</b> parallel side surfaces <b>16, 17, 18</b> and <b>19</b> each disposed halves of injection molds, the With <b>20</b> or. <b>21</b> or. <b>22</b> or. <b>23</b> are designated.

On the side facing away from the core support body side of the Move ble platen, the end portions of the two ver sliding rails by a cross <b>24</b> connected (<b>Fig.</b> 2). Between this beam and the movable mold clamping plate is a double-loadable working cylinder, in the present case is a pneumatic or hydraulic cylinder <b>25</b> angeord net, through its acting appropriately on the Relativbe movements of the sliding spars together with the carrier body in with respect to the movable platen <b>9</b> done.

<b>Fig.</b> 2 shows a plan view of the embodiment of <b>Fig.</b> 1, out of the paired arrangement of the spars <b>7</b> and the Holme <b>11</b> and <b>12</b> apparent (the pair of bars <b>8th</b> is in <b>Fig.</b> not 2 visible).

In <b>Fig.</b> 1 and 2 is formed in known manner Closing unit for clarity not shown.

It is simple, in a toggle joint, which means a known, double-loadable hydraulic Working cylinder the movable platen from the a final position, ie the position with the maximum distance the platens in the other end position, ie minima lem distance between the two platens and therefore simultaneity tiger form a closed injection mold of two a other oppositely disposed mold halves brings. As Closing unit may also include a known closing unit with drive cylinders and Formzuhaltezylindern are used, the ver the sliding platen during an injection cycle just if shifts between these two positions.

In <b>Fig.</b> 2 is a dashed line the position of the movable mold platen shown in its second end position. dashed lines is still the runner located, about in the form nest by the two mold halves <b>23</b> and <b>10</b> after closing the through it defined the injection plasticized cloth material by means of a second plasticizing and injection unit is injected. This consists of a runner parallel to the direction of the bars extending portion <b>26</b>, of the in the direction perpendicular to the movement and thus parallel extending to the direction of the bars of the front side movable platen opens.

The second plasticizing and injection unit with <b>29</b> designated and perpendicular to Holmen <b>7, 8</b> and also perpendicular to the bars <b>11</b> and <b>12</b> guided. Once the movable mold clamping plate has reached its second end position, the second plasticizing and injection unit, previously out of range of the ver itself sliding platen was, in the direction of Holm procedural direction perpendicular to it against the sides area <b>28</b> which opens gate hole <b>27</b> engages.

From the <b>Fig.</b> 1 and 2 it can be seen that below the struts <b>8th</b> in the horizontal plane, an endless belt <b>30</b> in the field of fixed platen <b>1</b> runs that the finished injection cast products transported away.

The movable platen <b>9</b> , instead of a gate hole <b>26, 27</b> a second gate hole <b>26 ', 27'</b> on show that in the side surface <b>28</b> opposite sides area <b>28 '</b> expires and dashed for then a second illustrated plasticizing and injection unit with <b>29 '</b> be records is provided.

In the <b>Fig.</b> 1 and 2, the injection molding machine in an intermediate position between the two end positions shown. The distance the core support body <b>13</b> for sliding platen <b>9</b> is so large that the core carrier body <b>13</b> can be pivoted about its axis, namely in the present case by 90 °. After such pivoting the mold halves <b>10</b> on the movable platen <b>9</b> and the mold half <b>23</b> the core support body <b>13</b> oppositely standing, wherein the mold half simultaneously <b>21</b> of Core support body <b>13</b> and the mold half <b>3</b> the fixed Formauf chipboard <b>1</b> are arranged opposite to each other.

An injection cycle is initiated in such a way that by ENT Talking pressurizing the working cylinder <b>25</b> the Move ble Holme <b>11</b> and <b>12</b> the core support body <b>13</b> toward the movable platen <b>9</b> move and that shortly before closing by the two mold halves <b>10</b> and <b>23</b> formed spray casting mold, the speed is reduced such that the mold is closed under creep. Subsequently by applying the driving cylinder of the not shown Closing unit of the movable platen <b>9</b> and the core support body <b>13</b> and the sliding rails <b>11, 12</b> an educated unit toward the fixed platen <b>1</b> be moves, which also shortly before the closing of the mold, the Ge speed of this unit is so reduced that from the two mold halves <b>21</b> and <b>3</b> for forming injection is closed under creep.

Subsequently, the plasticizing and injection unit <b>29</b> in Toward the Holme <b>7, 8</b> or. <b>11</b> and <b>12</b> so doing, they into engagement with the side surface in the <b>28</b> which opens runner <b>27</b> arrives. Then injected the plasticizing and A injection unit an appropriate amount of plasticized Ma material into the mold halves <b>10</b> and <b>23</b> spray formed mold (<b>Fig.</b> 1), while the plasticizing and injection unit <b>6</b> also plasticized material into the mold through the two halves <b>3</b> and <b>21</b> Injection mold formed injected, wherein in the Injection mold consists of the mold halves <b>3</b> and <b>21</b> a lost core and in that of the mold halves <b>10</b> and <b>23</b> formed injection form a finished injection molded article is produced.

Subsequently, the movable die platen <b>9</b> on Holmen <b>7</b> and <b>8th</b> and the displaced Holme <b>11</b> and <b>12</b> so doing, that the mold halves <b>10</b> and <b>23</b> so as <b>21</b> and <b>3</b> disengage and the core support body <b>13</b> rotated counterclockwise by 90 °, that the mold halves <b>10</b> and <b>22</b> as <b>20</b> and <b>3</b> opposite to each other are arranged. Then the sliding Formauf be chipboard <b>9</b> and the sliding rails <b>11, 12</b> so doing, the from the mold halves <b>10</b> and <b>22</b> as <b>20</b> and <b>3</b> spray formed foundry molds are closed and at the same time described in the surrounded, a lost core and a finished spray cast products can be sprayed.

Each rotary clock reaches one of attached to the support body arranged in mold halves consisting of <b>Fig.</b> 1 position shown the mold <b>20</b>, Then located where in this position Mold the finished molded articles from the mold is ejected. This is done in a conventional manner by means an ejector. This can be arranged in the core support body be such that the injection-molded article then to below the bars <b>8th</b> horizontally Plane extending endless conveyor belt <b>30</b> falls, the ejector may also in the movable platen <b>9</b> integrated be, then the finished injection-molded articles from the mold <b>10</b> ejects. In the latter case, the conveyor belt correspondingly more fixed toward the plate <b>2</b> is assigns.

The <b>Fig.</b> 3 and 4 show in the illustration of <b>Fig.</b> 1 and 2 another embodiment of an injection molding machine. Identical parts are provided with like reference numerals.

The difference from the embodiment in the <b>Fig.</b> 1 and 2 is that the two, with <b>31</b> and <b>32</b> designated displaceable spars are guided in a vertical plane and that thus the axis <b>33</b> the core carrier body also vertically extends.

The core carrier body in the <b>Fig.</b> 3 and 4 has, as shown in <b>Fig.</b> 3 he clearly how the core support body in the <b>Fig.</b> 1 and 2 a pris matic cross-section of a regular quadrilateral, ie a square corresponds.

The prismatic cross section of the core carrier body is neither at a quadrilateral still at an outline of a regular <i>N</i>-Eckes bound. It is essential that the opposing Side surfaces of the core carrier body having mold halves, are mutually parallel. This is readily apparent from the<b>Fig.</b> 1 and 4, since the mold clamping force from the Schließein unit must be applied.

<b>Fig.</b> 5 shows in the illustration of <b>Fig.</b> 4 From another guidance for the core support body, with <b>51</b> designated and the place of the core-supporting body into the <b>Fig.</b> 3 and 4 occurs. The core support body has perpendicular to its axis<b>52</b> an outline that corresponds an octagon, wherein the counter opposite side surfaces extending in the direction of the axis <b>52</b> extend, equal and parallel to each other are formed. The core carrier body<b>51</b> has mold halves <b>53, 54, 55, 56, 57</b> and <b>57 '</b> on.

The mold halves <b>53</b> and <b>56</b> correspond in position to form halves <b>2</b>¹ or. <b>2</b>³ in the <b>Fig.</b> 1 and 2. They work in the be impinging injection cycle hence the mold half <b>3</b> on the fixed platen <b>1</b> or with the mold half <b>10</b> on the movable platen <b>9</b> together not ( shown).

In addition, other plastifying and injection units <b>58, 59, 60</b> and <b>61</b> provided.

The other plasticizing and injection unit <b>58</b> is another platen <b>62</b> with a mounted mold half <b>63</b>. the other plasticizing and injection unit <b>59</b> another platen <b>64</b> and a mold half <b>65</b>, The other Plasticizing and injection unit <b>60</b> another mold clamping plate <b>66</b> with a mounted mold half <b>67</b> and the white direct plasticizing and injection unit <b>61</b> another Formauf chipboard <b>68</b> with a mounted mold half <b>69</b> assigned.

Each of the other plastifying and injection unit is supplied with the arranged further platen together with the plane spanned Mold half, as can be seen from the drawing, in the direction of the Axis of the carrier body, in a direction perpendicular to the associated support surface is slidably disposed.

The plasticizing and injection units <b>58</b> and <b>60</b> can together Her other platens and their mounted mold halves in place of the plasticizing and injection units <b>29</b> and <b>29 '</b> in <b>Fig.</b> 2 occur, they may also additionally be provided. In the latter case it is possible to injection parts manufacture, the different five sections Material properties exist.

Characterized in that the further plasticizing and injection units <b>58</b> and <b>60</b> along with their other platens and up clamped mold halves diametrically opposite to each other to at the sides of the core support body are arranged, the axis <b>52</b> the rotary body during the individual Splashes Act of forces relieved.

Similarly, in addition, the plasticizer can and injection units <b>61</b> and <b>59</b> with their mold clamping plates and mold halves can be provided. In this case it is possible, the performance of the <b>Fig.</b> 3 and 4 double injection molding, if also Spritzgußar Article with two different material areas or from cut be made.

With the in <b>Fig.</b> 5 arrangement shown it is also possible, produce injection molded articles, the six different material portions have if the displaceable mold clamping plate <b>9</b> with a plasticizing and injection unit <b>29</b> (see. <b>Fig.</b> 3 and 4, respectively) coopera processed.

In principle it is possible, also the two non-designated, facing each other lying areas with corresponding mold halves to provide that also with associated further plasticizing and injection units with correspondingly assigned further collaborate platens and mold halves.

<b>Fig.</b> 6 shows the representation of the <b>Fig.</b> 1 a Ausführungsbei play for controlling the position of the core support body <b>13</b> in from dependence of the position of the movable platen <b>9</b>,

Identical parts are provided with like reference numerals. For clarity, the sliding Holme <b>11, 12</b> on the core of the carrier body <b>13</b> opposite side of movable platen <b>9</b> omitted.

At one sliding rail for the core support body <b>13</b> is registered <b>70</b> flanged through an opening in the ver sliding platen <b>9</b> is passed.

At the free end of the profile <b>70</b> is the pinion <b>71</b> rotatably mounted. It meshes with the toothed racks <b>72</b> and <b>73</b>That on the mutually facing sides of the plate <b>2</b> or the movable mold platen <b>9</b> are fixedly disposed. The core carrier body<b>13</b> puts only half of the way back by the slidable platen <b>9</b> travels. Located at the sliding platen <b>9</b> in its fixed platen <b>2</b> Benach disclosed end position, then there is the movable core carrier body <b>13</b> exactly in the middle between the mold halves <b>3</b> and <b>10</b>,

A particular advantage is that the rotational movement of the Core support body <b>13</b> can be initiated as soon as the necessary opening width is achieved. Waiting times. Cycle time is saved and also the acceleration forces to the support system of the core carrier body <b>13</b> reduced or in mechanical reproduction of the moving mold plate <b>9</b> brought. The entire opening stroke of the molding machine can thus ge be exploited legal what optimal use of the mold space guaranteed.