JP5666982B2 - Multicolor molded product manufacturing method and mold - Google Patents

Description

  The present invention relates to a method for producing a multicolor molded product and a mold.

  Conventionally, as a method for producing a multi-color molded product comprising a first molded product and a second molded product made of a different material or the same type of material and having a different color, for example, The thing of the following patent document 1 is known. In the device described in Patent Document 1, the first molding space (cavity C1) for forming the first molded product and the second molding space (cavity C2) for forming the second molded product have different colors. The first molded product and the second molded product are integrally formed by sequentially injecting the molten resin.

  When the molten resin is injected into the first molding space, it is necessary to close the opening on the second molding space side in the first molding space to prevent the molten resin from entering the second molding space. In Patent Document 1, an opening on the second molding space side in the first molding space is closed by allowing a slide mold (dividing bar) to enter the cavity. Moreover, the approach direction of the slide mold at this time is a direction that intersects the plane of the multicolor molded product. That is, the surface that closes the opening in the slide mold corresponds to the boundary surface between the first molding space and the second molding space, and thus the boundary between the first molded product and the second molded product.

JP 2007-130914 A

  In addition, it is also known that when a multicolor molded product is molded, a groove is formed corresponding to a boundary portion between the first molded product and the second molded product. By arranging the boundary part in the groove part, the boundary part can be made difficult to see and the design can be improved. Here, an example of a method for forming a groove at the boundary between the first molded product and the second molded product will be described with reference to FIGS.

  First, as shown in FIG. 21, a pair of molds 1 and 2 are closed to form a groove forming space 3 corresponding to the shape of the groove. Next, as shown in FIG. 22, the slide die 4 is caused to enter the groove forming space 3 along a direction (vertical direction in FIG. 22) intersecting the plane (design surface) of the molded product. At this time, the slide mold 4 is brought into contact with the tip surface of the protrusion 8 for forming the groove. Thereby, the opening on the second molding space 6 side in the first molding space 5 is closed by the slide mold 4.

  In this state, the first molded product 5A is molded by injecting molten resin to the first molding space 5 side. Next, as shown in FIG. 23, the slide mold 4 is retracted from the groove forming space 3, and then the molten resin is injected into the second molding space 6 to mold the second molded product 6 </ b> A. Thus, the boundary between the first molded product 5 </ b> A and the second molded product 6 </ b> A is formed on the back wall that forms the groove 7 while the groove 7 is formed.

  However, the multicolor molding method in which the slide mold 4 enters the molding space along the direction (vertical direction in FIG. 23) intersecting the plane of the multicolor molded product as described above is the groove 7 (first Although it is applicable if the boundary between the first molded product 5A and the second molded product 6A is formed only on a single plane, the groove 7 (the first molded product 5A and the second molded product 6A Cannot be applied to a multicolor molded product (see FIG. 1) formed over two plate portions (first plate portion and second plate portion) formed by bending the boundary. The reason for this will be described with reference to FIG.

  This is because, in order to form the groove portion 7 (the boundary between the first molded product 5A and the second molded product 6A) across the two plate portions, the groove portion forming space 3 is formed into a molding space corresponding to the first plate portion ( It is because it is necessary to comprise from the code | symbol 3A in FIG. 24, and the shaping | molding space (code | symbol 3B in FIG. 24) corresponding to a 2nd board part. 24 is a cross-sectional view taken along the extending direction of the groove 7 (corresponding to a cross-sectional view taken along the line AA in FIG. 21).

  For this reason, if the slide mold 4 is entered from the direction intersecting the plane direction of the first plate portion (lower side in FIG. 24) (the slide mold after entry is indicated by a two-dot chain line), the molding space 3A is formed. Although it can be closed (the slide mold 4 is brought into contact with the molding surface 3A1 of the molding space 3A), the molding space 3B cannot be closed (the slide mold 4 is brought into contact with the molding surface 3B1 of the molding space 3B). . For this reason, as a result of the gap SA between the molding surface 3B1 and the slide mold 4, the opening on the second molding space side in the first molding space cannot be closed. That is, as a result of the molten resin passing through the gap SA and entering the second molding space, the first molded product cannot be molded.

  The present invention has been completed based on the above-described circumstances, and the first molded product and the second molded product extend over both the first plate portion and the second plate portion that are arranged so as to be bent with respect to each other. It is an object of the present invention to provide a method for producing a multicolor molded product capable of molding a multicolor molded product in which a boundary portion is formed. Moreover, it aims at providing the shaping | molding die which can shape | mold such a multicolor molded product.

  In order to solve the above-mentioned problem, the method for producing a multicolor molded product according to the present invention is a second molded product in which the first molded product and the first molded product are made of different materials or the same kind of materials but having different colors. The multicolor molded product includes a groove portion extending along a boundary between the first molded product and the second molded product, and a first method. A plate portion and a second plate portion that rises from the peripheral end of the first plate portion with respect to the first plate portion, and the groove portion is formed between the first plate portion and the second plate portion. The first molded product has a configuration that extends in both directions, forms a first molded space for molding the first molded product, and injects molten resin into the first molded space. Forming a second molding space for molding the second molded product, and forming a second molding space in front of the second molding space. And a second molding step of molding the second molded product by injecting a molten resin having a color different from that of the first molded product, and the groove portion is configured by the first molding step and the second molding step. The wall portion is formed corresponding to a connecting portion between the first forming space and the second forming space, and in the first forming step, the extending portion extends along the extending direction of the groove portion. A slide mold having a surface is moved in the extending direction of a bent surface constituted by the plate surface of the first plate portion and the plate surface of the second plate portion, whereby the first forming space is formed by the extended surface. It is characterized in that the opening on the second molding space side is closed.

  In the present invention, the slide mold having the extending surface extending along the extending direction of the groove portion is moved in the extending direction of the bent surface constituted by the plate surface of the first plate portion and the plate surface of the second plate portion. Thus, the opening on the second molding space side in the first molding space can be closed by the extended surface. Thereby, even if it is a case where a groove part extends over both the 1st board part and the 2nd board part, the 1st forming space can be formed.

  In the above method, in the first forming step, the slide mold may be moved in the extending direction of the bent surface by a cam slide mechanism.

  In the case of a configuration in which a drive device such as a cylinder is directly attached to the slide mold and moved, it is necessary to dispose the drive device on the same straight line as the slide mold moving direction. In this regard, with the cam slide mechanism, the drive device can be arranged regardless of the moving direction of the slide mold, and the degree of freedom in mold design is improved.

  Also, in the case of a configuration in which the drive device is directly attached to the slide mold, it becomes difficult to attach the drive device if the size of the slide mold is reduced. In this respect, the cam slide mechanism can be easily applied regardless of the size of the slide mold because it is not necessary to directly attach the drive device to the slide mold.

  Next, in order to solve the above-mentioned problem, the molding die of the present invention includes a first molded product and a second molded product made of a different material or the same material and having a different color from the first molded product. A mold for molding a multicolor molded product, wherein the multicolor molded product has a groove extending along a boundary between the first molded product and the second molded product, and A first plate portion; and a second plate portion that rises from a peripheral end of the first plate portion with respect to the first plate portion, and the groove portion includes the first plate portion and the second plate. The molding die has a configuration formed so as to extend over both of the portions. The molding die includes a pair of dies provided so as to be openable and closable and an extending surface extending along the extending direction of the groove portion. And a first mold for forming the first molded product by the pair of molds and the slide mold. A bending space formed by a plate surface of the first plate portion and a plate surface of the second plate portion is configured to be capable of forming a molding space and a second molding space for molding the second molded product. By moving in the extending direction of the surface, the extended surface can close the opening on the second forming space side in the first forming space.

  According to the present invention, there is provided a multicolor molded product in which a boundary portion between the first molded product and the second molded product is formed across both the first plate portion and the second plate portion that are arranged so as to be bent with respect to each other. A method for producing a moldable multicolor molded product can be provided. Moreover, the shaping | molding die which can shape | mold such a multicolor molded product can be provided.

The perspective view which shows the door trim which concerns on Embodiment 1 of this invention. The perspective view which expands and shows the groove part vicinity in the door trim of FIG. 1 (corresponding to the figure cut | disconnected by the BB line of FIG.1 and FIG.3) Schematic showing door trim and slide mold Sectional drawing which shows the shaping | molding die concerning Embodiment 1 of this invention (corresponding to the figure cut | disconnected by the BB line of FIG.1 and FIG.3) Sectional drawing which shows the state which advanced the slide type | mold from the state of FIG. 4, and formed the 1st shaping | molding space. Sectional drawing which shows the state which inject | poured resin into the 1st shaping | molding space from the state of FIG. Sectional drawing which shows the state which made the slide type | mold retreat from the state of FIG. 6, and formed the 2nd shaping | molding space Sectional drawing which shows the state which inject | poured resin into the 2nd shaping | molding space from the state of FIG. Sectional drawing which shows the cross-sectional structure along the extension direction of a protrusion in a shaping | molding die (corresponding to the figure cut | disconnected by CC line of FIG. 7) Sectional drawing which shows the shaping | molding die concerning Embodiment 2 of this invention. Sectional drawing which shows the state which advanced the slide type | mold from the state of FIG. 10, and formed the 1st shaping | molding space. Sectional drawing which shows the state which made the slide type | mold retreat from the state of FIG. 11, and formed the 2nd shaping | molding space Sectional drawing which shows the state which inject | poured resin into the 2nd shaping | molding space from the state of FIG. Sectional drawing which shows the shaping | molding die concerning Embodiment 3 of this invention. Sectional drawing which shows the state which advanced the slide type | mold from the state of FIG. 14, and formed the 1st shaping | molding space. Sectional drawing which shows the state which made the slide type | mold retreat from the state of FIG. 15, and formed the 2nd shaping | molding space Sectional drawing which shows the state which inject | poured resin into the 2nd shaping | molding space from the state of FIG. Sectional drawing which shows the shaping | molding die concerning Embodiment 4 of this invention. Sectional drawing which shows the state which advanced the slide type | mold from the state of FIG. 18, and formed the 1st shaping | molding space. 19 is a cross-sectional view showing a state in which the slide mold is retracted from the state of FIG. 19 and the resin is injected into the second molding space. Sectional drawing which shows the shaping | molding die in a prior art example Sectional drawing which shows the state which advanced the slide type | mold from the state of FIG. 21, and inject | emitted resin to the 1st molding space Sectional drawing which shows the state which made the slide type | mold retreat from the state of FIG. 22, and inject | poured resin to the 2nd molding space Sectional drawing which shows the problem of a prior art example (corresponding to the figure cut | disconnected by the AA line of FIG. 21)

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the door trim 10 attached to a vehicle door is illustrated. FIG. 1 is a perspective view of a door trim 10 of the present embodiment. The door trim 10 includes a trim board 20 formed by forming a thermoplastic synthetic resin such as polypropylene (polyolefin resin) into a plate shape.

  As shown in FIG. 1, the trim board 20 (multicolor molded product) includes a main surface portion 21 (first plate portion) having a substantially rectangular shape in front view, and a side end (peripheral end) of the main surface portion 21. Each is mainly composed of a standing wall portion 22 (second plate portion) that rises on the back side (outside of the passenger compartment). In other words, the standing wall portion 22 is configured to rise in a shape that is bent with respect to the main surface portion 21.

  The main surface portion 21 constitutes almost the entire surface of the vehicle door on the vehicle interior side. As shown in FIG. 1, the main surface portion 21 protrudes from the front side (vehicle interior side) to the armrest 12. Is formed. A speaker grill 16 and a door pocket 18 are attached to the main surface portion 21.

  The trim board 20 has a groove 23 extending along the horizontal direction. As shown in FIG. 2, the groove 23 is formed by denting the design surface 20 </ b> A (front surface) of the trim board 20, and is formed so as to extend over the main surface portion 21 and the compatible wall portion 22. (See FIGS. 1 and 3). The trim board 20 is formed of different materials with different colors, with the groove 23 as a boundary.

  In the following description, a part above the groove 23 constituting the trim board 20 is referred to as a first molded product 30 and a lower part is referred to as a second molded product 40. In addition, the 1st molded product 30 and the 2nd molded product 40 should just be different in color, and may be formed with the same kind of material. In the present embodiment, by arranging the boundary (boundary of different colors) between the first molded product 30 and the second molded product 40 inside the groove portion 23, it is difficult to visually recognize the color boundary, and the design property is enhanced. ing. Moreover, in this embodiment, one side wall part 32 and the bottom wall part 31 are formed in the 1st molded product 30 among the wall parts (a pair of side wall part and bottom wall part) which comprise the groove part 23, and the other Side wall portion 42 is formed on the second molded product 40 (see FIG. 2).

  Next, the configuration of the molding die 50 for molding the trim board 20 (the first molded product 30 and the second molded product 40) will be described with reference to the drawings of FIGS. As shown in FIG. 4, the molding die 50 is incorporated in a lower die 51 (core die), an upper die 61 (cavity die) disposed so as to face the lower die 51, and the lower die 51. The slide mold 70 and a cam driver 80 for sliding the slide mold 70 are provided.

  The lower mold 51 and the upper mold 61 (a pair of molds) are provided so that they can be opened and closed. In the molding die 50 of the present embodiment, a molding space 90 (cavity) for molding the trim board 20 is formed by the lower die 51, the upper die 61 and the slide die 70, and molten resin is injected into the molding space 90. By doing so, the trim board 20 can be formed.

  In the following description, among the molding spaces 90, a space for molding the first molded product 30 is called a first molding space 91, and a space for molding the second molded product 40 is called a second molding space 92. To do. The molding die 50 of the present embodiment includes a first gate (not shown) disposed in communication with the first molding space 91 and a second gate disposed in communication with the second molding space 92. (Not shown), and is configured such that the molten resin can be individually supplied to the first molding space 91 and the second molding space 92, respectively.

  The surface of the upper mold 61 facing the lower mold 51 has a shape that follows the shape of the design surface 20A of the trim board 20, and specifically, the plate surface 21A of the main surface portion 21 and the plate surface of the standing wall portion 22. The bent surface follows the bent surface constituted by 22A. In addition, the upper mold 61 is opposed to the lower mold 51 except for a contact portion (a side surface 62B of the protrusion 62) with an extended surface 71A of the slide mold 70 described later (a wavy line in each figure). Is formed). A texture pattern is formed on the design surface 20A of the trim board 20 by the texture pattern. A protrusion 62 for forming the groove 23 is formed on the surface of the upper mold 61 facing the lower mold 51.

  The opposing surface of the lower mold 51 and the slide mold 70 to the upper mold 61 has a shape that follows the shape of the back surface of the trim board 20, and specifically, the plate surface 21 </ b> A of the main surface portion 21 and the standing wall portion 22. The bent surface follows the bent surface constituted by the plate surface 22A. In FIG. 3, the facing surface 70 </ b> A of the slide mold 70 facing the upper mold 61 is a bent surface that follows the bent surface constituted by the plate surface 21 </ b> A of the main surface portion 21 and the plate surface 22 </ b> A of the standing wall portion 22. (See also FIG. 9).

  A concave portion 63 for forming the groove 23 is formed at a location facing the protrusion 62 on the surface of the lower die 51 and the slide die 70 facing the upper die 61. The recess 63 is constituted by a step 71 formed in the slide mold 70 and a part of the lower mold 51.

  A space (see FIG. 4) provided between the protrusion 62 and the recess 63 is for forming the groove 23 (more precisely, a wall portion constituting the groove 23). As described above, the groove portion 23 is formed so as to extend over the main surface portion 21 and the compatible wall portion 22. Correspondingly, the projecting end surface 62A of the projecting portion 62 is curved in a shape corresponding to the bent surface constituted by the plate surface 21A of the main surface portion 21 and the plate surface 22A of the standing wall portion 22 in the side view shown in FIG. doing. Further, as shown in FIG. 9, the bottom surface 63A of the recess 63 in the slide mold 70 is also bent by the plate surface 21A of the main surface portion 21 and the plate surface 22A of the standing wall portion 22, as shown in FIGS. Curved in a shape corresponding to the surface.

  In the stepped portion 71 of the slide mold 70, the extending surface 71A, which is the surface facing the side surface 62B of the protrusion 62, has an extending direction of the groove 23 (more precisely, the side surface 62B of the groove 23 as shown in FIG. 9). In the extending direction). As shown in FIG. 9, the extending surface 71A is formed so as to overlap the entire surface in a side view with respect to the gap S1 formed between the projecting end surface 62A of the projecting portion 62 and the bottom surface 63A of the recessed portion 63. Has been. In FIG. 9, a region surrounded by a two-dot chain line is an extended surface 71A. The gap S <b> 1 is an opening on the second molding space 92 side in the first molding space 91.

  In the present embodiment, the slide mold 70 is configured to be slid by the cam slide mechanism 65. The cam slide mechanism 65 is mainly composed of a slide mold 70 (cam surface 72) and a cam driver 80. More specifically, in the slide mold 70 (cam slide), the side surface on the side opposite to the protrusion 62 (right side in FIG. 5) has a shape that is cut out toward the inner side, and its inner surface. Is the cam surface 72. The cam driver 80 is provided on the opposite side of the projecting portion 62 with respect to the slide mold 70, and has a cam surface 81 that can come into contact with the cam surface 72.

  The cam driver 80 can be raised or lowered by a drive device (not shown) such as a hydraulic cylinder. Both cam surfaces 72 and 81 are inclined with respect to the moving direction of the cam driver 80 (the vertical direction in FIG. 5). Both cam surfaces 72 and 81 are inclined downward toward the protrusion 62. As a result, by raising the cam driver 80, the cam surface 72 slides with respect to the cam surface 81, and the cam surface 72 is pressed by the cam surface 81. As a result, the slide mold 70 is directed toward the protrusion 62. The configuration is movable to the left (left side of FIG. 4). In addition, for example, a sliding material (not shown) is interposed between both the cam surfaces 72 and 81, and both the cam surfaces can slide with respect to each other.

  Thereby, a part of the extended surface 71A of the slide mold 70 can be brought into contact with (pressed against) the side surface 62B of the protrusion 62 that faces the extended surface 71A. As described above, a part of the extended surface 71A is brought into contact with the side surface 62B of the protrusion 62, whereby the above-described gap S1 (opening on the second molding space 92 side in the first molding space 91) is extended. 71A can be closed (closed) from the second molding space 92 side (state of FIGS. 5 and 6).

  A spring 74 (urging means) wound around the rod 73 is interposed between the side surface of the slide mold 70 opposite to the cam driver 80 and the lower mold 51. As a result, the slide mold 70 is biased in a direction (right side in FIG. 5) in which the extended surface 71A moves away from the protrusion 62. Such an urging means is not limited to the spring 74. Therefore, the slide mold 70 can be moved away from the protrusion 62 by lowering the cam driver 80 from the state shown in FIG.

  With the above-described configuration, the slide mold 70 has a retracted position (position shown in FIGS. 4 and 7) in which the extended surface 71A is disposed with a gap between the projecting portion 62 and the side surface 62B, and the retracted position. It is possible to move between a forward position (a position shown in FIGS. 5 and 6) in which a part of the extended surface 71A is pressed against the side surface 62B of the protrusion 62. When the slide mold 70 is in the retracted position, the first molding space 91 and the second molding space 92 are in communication with each other.

  As described above, in this embodiment, the trim board 20 that is a molded product has the main surface portion 21 and the standing wall portion 22. That is, the bent surface is constituted by the plate surface of the main surface portion 21 and the plate surface of the standing wall portion 22. For this reason, as shown in FIG. 3, the facing surface 70 </ b> A of the slide die 70 facing the upper die 61 is bent in a shape corresponding to the plate surface 21 </ b> A of the main surface portion 21 and the plate surface 22 </ b> A of the standing wall portion 22. The sliding direction of the slide mold 70 by the cam slide mechanism 65 described above is the extending direction of the bent surface formed by the plate surface 21A of the main surface portion 21 and the plate surface 22A of the standing wall portion 22 (and extension of the design surface 20A). Direction) (arrow B1 shown in FIG. 3). The “extending direction of the bent surface constituted by the plate surface 21A of the main surface portion 21 and the plate surface 22A of the standing wall portion 22” referred to herein is a common extending direction of the plate surface 21A and the plate surface 22A. Say.

  Next, a method for manufacturing the trim board 20 using the mold 50 will be described with reference to the drawings of FIGS. The method for manufacturing the trim board 20 in the present embodiment includes a first molding step for molding the first molded product 30 and a second molding step for molding the second molded product 40.

<First molding step>
First, as shown in FIG. 4, the upper mold 61 is superposed on the lower mold 51 and the mold is closed. At this time, the slide mold 70 is not in contact with the protrusion 62 of the upper mold 61. Next, as shown in FIG. 5, the cam driver 80 is raised and the slide mold 70 is moved to the forward movement position. Then, a part of the extending surface 71A of the slide mold 70 is pressed against the side surface 62B of the protrusion 62 as shown in FIG. Accordingly, the gap S1 formed between the projecting end surface 62A of the projecting portion 62 and the bottom surface 63A of the recessed portion 63 is blocked from the second molding space 92 side by the extending surface 71A. As a result, the first molding space 91 that is a closed space is formed on the left side of the extension surface 71A, in other words, the opening on the second molding space 92 side in the first molding space 91 is formed by the extension surface 71A. It becomes a blocked state.

  Here, “the state in which the opening on the second molding space 92 side in the first molding space 91 is closed” means that when the molten resin is injected into the first molding space 91, the molten resin extends to the extending surface 71A. Is a state in which the air does not flow into the second molding space 92 side. In addition, since the embossed pattern is not formed in the side surface 62B of the protrusion 62, when a part of the extended surface 71A is pressed, it is between the part of the extended surface 71A and the side surface 62B of the protrusion 62. There will be no gaps.

  In this state, as shown in FIG. 6, by injecting a molten resin (first resin) from a first gate (not shown) arranged in communication with the first molding space 91, the first molding space is obtained. 91 is filled with the first resin. When the first resin eventually cools and hardens, the first molded product 30 is molded.

<Second molding step>
After the first molded product 30 is molded, the cam driver 80 is lowered to retract the slide mold 70 to the retracted position. Thereby, as shown in FIG. 7, the second molding space 92 is formed. That is, the second molding space 92 is a space surrounded by the upper mold 61, the slide mold 70, and the first molded product 30.

  In this state, from a second gate (not shown) arranged in communication with the second molding space 92, the first resin forming the first molded product 30 is made of a different material (or the same kind of material). By injecting molten resin (second resin) made of different colors, the second molding space 92 is filled with the second resin (see FIG. 8). By injecting the molten second resin into the second molding space 92, the first resin and the second resin melt and mix with each other at the end of the first molded product 30. Eventually, when the second resin cools and hardens, the second molded product 40 is molded, and at the same time, both parts are joined at the boundary between the first molded product 30 and the second molded product 40. Through the above steps, the trim board 20 (the first molded product 30 and the second molded product 40) is formed, and the wall portion constituting the groove portion 23 corresponds to the connecting portion between the first molding space 91 and the second molding space 92. And then molded.

  In order to increase the bonding force between the first molded product 30 and the second molded product 40, the fusion between the first molded product 30 and the second molded product 40 (first resin and second resin) is promoted. It is preferable to do. For this reason, it is preferable to shorten the cooling time of the first molded product 30 as much as possible and inject the second resin before the first molded product 30 is completely cooled and solidified.

  Then, the effect of this embodiment is demonstrated. In the present embodiment, the slide mold 70 having the extending surface 71A extending along the extending direction of the groove portion 23 is formed by extending the bent surface constituted by the plate surface 21A of the main surface portion 21 and the plate surface 22A of the standing wall portion 22. By moving in the direction, the opening (gap S1) on the second molding space 92 side in the first molding space 91 can be closed by the extending surface 71A.

  In other words, the opening (gap S1) on the second molding space 92 side in the first molding space 91 corresponds to a bent surface formed by the plate surface 21A of the main surface portion 21 and the plate surface 22A of the standing wall portion 22 in a side view. And bent (see FIG. 9). With respect to such a gap S1, the extending surface 71A overlapping the gap S1 in a side view is moved from the side (the extending direction of the bent surfaces 21A and 22A, the paper surface penetrating direction in FIG. 9), thereby the gap S1. Can be blocked over the entire surface in a side view. Thus, when the groove part 23 extends over both the main surface part 21 and the standing wall part 22, that is, when the opening on the second molding space 92 side in the first molding space 91 is bent in a side view. Even if it exists, the 1st shaping | molding space 91 can be formed.

  In the present embodiment, the slide mold 70 is moved in the extending direction (from the retracted position to the advanced position) of the bent surfaces 21A and 22A by the cam slide mechanism 65 in the first molding step.

  In the case of a configuration in which a drive device such as a cylinder is directly attached to the slide mold 70 and moved, the drive device needs to be arranged on the same straight line as the moving direction of the slide mold 70. For example, in the present embodiment, it is necessary to dispose the drive device on the right side (one side in the moving direction) of the slide mold 70 shown in FIG. In this respect, with the cam slide mechanism, the drive device can be arranged regardless of the moving direction of the slide mold 70, and the degree of freedom in mold design is improved.

  Further, in the case where the drive device is attached to the slide mold 70, it becomes difficult to attach the drive device when the size of the slide mold 70 is reduced. For example, the depth of the groove 23 formed in the plate-like member such as the trim board 20 is generally set to a very small value (for example, about several mm). Accordingly, the size of the slide mold 70, particularly the length of the groove 23 in the depth direction (vertical direction in FIG. 4) may be very small. In this regard, the cam slide mechanism can be applied regardless of the size of the slide mold 70 because it is not necessary to directly attach the drive device to the slide mold 70.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. The molding die 150 of the present embodiment is different from the above-described embodiment in that a step portion 177 is formed on the slide die 70.

  The stepped portion 177 is formed at a corner formed by the extending surface 71A and the bottom surface 63A of the recess 63, and protrudes from the bottom surface 63A toward the upper mold 61 as shown in FIG. Further, the step portion 177 has a shape extending along the extending direction of the recess 63. The stepped portion 177 does not have to extend over the entire length in the extending direction of the recessed portion 63, and may be formed in a form in which a plurality of steps are arranged in the extending direction of the recessed portion 63.

  Next, the operation and effect obtained by providing such a stepped portion 177 will be described. In the first molding step, a notch 131 that is recessed corresponding to the shape of the stepped portion 177 is formed on the back surface (the side opposite to the design surface 20A) of the bottom wall portion 31 of the first molded product 30 (see FIG. 11 and FIG. 11). (See FIG. 12). Subsequently, in the second molding step, when the molten resin is injected and filled into the second molding space 92, the molten resin enters the notch 131 as shown in FIG. Thereby, the bottom wall part 31 is pressed by the molten resin in a direction toward the upper mold 61 (the pressure at this time is indicated by an arrow P1).

  By the way, the 1st molded article 30 may shrink | contract at the time of cooling, etc., and a clearance gap may arise between the bottom wall part 31 and 62 A of protrusion end surfaces. When such a gap occurs, when the molten resin is injected into the second molding space 92, the molten resin may enter the gap and become a burr. Since the projecting end surface 62A side of the bottom wall portion 31 is the design surface 20A side of the trim board 20, the occurrence of such burrs is not particularly preferable.

  In this regard, in the present embodiment, by forming the notch 131 on the back surface of the bottom wall portion 31, the bottom wall portion 31 is pushed against the protruding end surface 62 </ b> A of the protrusion 62 of the upper mold 61 when the second molded product 40 is formed. I was able to guess. As a result, a situation in which a gap is generated between the bottom wall portion 31 and the projecting end surface 62A can be suppressed, and a situation in which burrs are generated on the design surface 20A side can be suppressed. As a result, design properties can be enhanced.

  When a gap is generated between the bottom wall portion 31 and the protruding end surface 62A due to the shrinkage of the first molded product 30 during cooling, the size of the gap is equal to the shrinkage amount of the first molded product 30. Proportional. When the plate thickness of the bottom wall portion 31 is, for example, 4 mm, the gap generated between the bottom wall portion 31 and the projecting end surface 62A is, for example, about 0.007 mm, depending on the material of the first molded product. . In this case, the height of the stepped portion 177 (the amount of protrusion from the bottom surface 63A) is preferably set to a value larger than 0.007 mm, for example, preferably set to about 1 mm. In addition, the plate | board thickness of the bottom wall part 31 and the height of the step part 177 are not limited to the value mentioned above, It can change suitably.

<Embodiment 3>
Next, a third embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. In the molding die 250 of the present embodiment, the configurations of the lower die 251 and the slide die 270 are different from those of the above embodiment, and the boundary between the first molded product 230 and the second molded product 240 is different from those of the above embodiments. Formed.

  In the present embodiment, of the wall portions (the pair of side wall portions 232 and 242, and the bottom wall portion 241) constituting the groove portion 23, one side wall portion 232 is formed in the first molded product 230, and the bottom wall portion 241 is formed. And the other side wall part 242 is formed in the 2nd molded product 240 (refer FIG. 17). That is, the first molded product 230 and the second molded product 240 are joined at one side wall 232 and the bottom wall 241.

  In the present embodiment, the slide mold 270 is along the design surface 20A of the trim board 220 (the bent surface constituted by the plate surface of the first plate portion and the plate surface of the second plate portion), as in the above embodiments. It is the structure which moves to the direction (left-right direction of FIGS. 14-17). Specifically, the slide mold 270 is movable such that the upper surface 271A (extension surface) thereof is along the lower surface 251D of the lower mold 251. The slide mold 270 can move between the retracted position (position shown in FIG. 14) and the retracted position. To the forward movement position (position shown in FIG. 15) slid to the right side of FIG.

  In the state in which the slide mold 270 is in the retracted position, as shown in FIG. 14, the recess 272 provided in the slide mold 270 communicates with the end of the first molding space 291 and the end of the second molding space 292. The concave portion 63 for forming the groove portion 23 is configured by the concave portion 272 and the wall surface of the lower mold 251.

  In the state where the slide mold 270 is in the forward movement position, as shown in FIG. 15, the upper surface 271A of the slide mold 270 is formed between the side surface 62D of the protrusion 62 and the side surface 251A of the lower mold 251 (the side surface facing the side surface 62D). The gap S <b> 2 (the opening on the second molding space 292 side in the first molding space 291) that is generated in is closed. The upper surface 271A of the slide mold 270 has a bent shape that follows the bent shape of the design surface 20A of the trim board 220, and the gap S2 is formed from the second molding space 292 side (lower side in FIG. 14) of the concave portion 63. It is set as the structure which can be obstruct | occluded over the full length.

  Note that the slide mold 270 can be moved between the forward position and the backward position by the cam slide mechanism as in the first embodiment. This cam slide mechanism is basically the same mechanism as the cam slide mechanism 65 of the first embodiment, and a cam driver and a spring (biasing means) compared to the cam slide mechanism 65 of the first embodiment. Since the arrangement of the left and right is simply changed, the description is omitted.

  Next, a method for manufacturing the trim board 220 using the mold 250 will be described with reference to FIGS. 15 to 17. The manufacturing method of the trim board 220 in the present embodiment includes a first molding step for molding the first molded product 230 and a second molding step for molding the second molded product 240.

<First molding step>
First, as shown in FIG. 15, the slide mold 270 is moved to the forward movement position. Then, a part of the upper surface 271A of the slide mold 270 comes into contact with both the projecting end surface 62A of the protrusion 62 and the lower surface 251D of the lower mold 251 as shown in FIG. Accordingly, the gap S2 generated between the side surface 62D of the protrusion 62 and the side surface 251A of the lower mold 251 can be closed from the second molding space 292 side by the upper surface 271A, and the first molding space 291 is formed. . In this embodiment, the protruding end surface 62A of the protrusion 62 is not formed with a texture pattern, and the upper surface 271A and the protruding end surface 62A are in contact with each other without a gap.

  In this state, as shown in FIG. 15, by injecting a molten resin (first resin) from a first gate (not shown) arranged in communication with the first molding space 291, the first molding space is obtained. 291 is filled with the first resin. When the first resin eventually cools and hardens, the first molded product 230 is molded.

<Second molding step>
After the first molded product 230 is molded, the slide mold 270 is retracted to the retracted position. Thereby, as shown in FIG. 16, it will be in the state in which the 2nd shaping | molding space 292 was formed. That is, the second molding space 292 is a space surrounded by the upper mold 61, the lower mold 251, the slide mold 270, and the first molded product 230.

  In this state, from a second gate (not shown) arranged in communication with the second molding space 292, the first resin forming the first molded product 230 is made of a different material (or the same material). By injecting molten resin (second resin) made of different colors, the second molding space 292 is filled with the second resin (see FIG. 17). Thereby, the trim board 220 is formed in a state where the end of the first molded product 230 and the second molded product 240 are joined.

<Embodiment 4>
Next, a fourth embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. In the molding die 350 of the present embodiment, the configurations of the lower die 351 and the slide die 370 are different from those in the above embodiment, and the boundary between the first molded product 330 and the second molded product 340 is different from those in the above embodiments. Formed.

  In the present embodiment, the wall portions (the pair of side wall portions 332 and 342 and the bottom wall portion 341) constituting the groove portion 23 are formed in the second molded product 340, and the first molded product 330 and the second molded product. The side wall portion 332 of 340 is joined (see FIG. 20).

  In the present embodiment, as shown in FIG. 18, a space for forming the groove 23 is formed by the protrusion 62 and the recess 372 formed in the slide mold 370. The upper surface 370 </ b> A of the slide mold 370 extends along the extending direction of the groove 23 and is a bent surface that is bent in a shape corresponding to the design surface 20 </ b> A of the trim board 20.

  The slide mold 370 moves in the direction along the design surface 20A of the trim board 20 (the bent surface formed by the plate surface of the first plate portion and the plate surface of the second plate portion) (the left-right direction in FIGS. 18 to 20). It is the composition to do. Specifically, the slide mold 370 is movable between a retracted position (position shown in FIGS. 18 and 20) and an advanced position (position shown in FIG. 19) slid to the right side of FIG. It has become.

  In the state where the slide mold 370 is in the retracted position, as shown in FIG. 18, the surfaces constituting the recess 372 of the slide mold 370 are arranged with a gap from the surfaces constituting the protrusion 62 of the upper mold 61. The groove 23 can be formed by this gap.

  In the state where the slide mold 370 is in the forward movement position, as shown in FIG. 19, the side surface 372A of the recess 372 of the slide mold 370 is in contact with the side surface 62D of the projecting portion 62 opposed to the recess 372. In other words, when the upper surface 370A (extension surface) of the slide mold 370 slides toward the protrusion 62, an opening on the second molding space 392 side in the first molding space 391 (see FIG. 18) is partly formed by a part of the upper surface 370A. (Corresponding to the gap S3) is closed. In the present embodiment, the side surface 62D of the protrusion 62 is not formed with a texture pattern, and the side surface 372A of the recess 372 and the side surface 62D of the protrusion 62 are in contact with each other without a gap.

  Note that the slide mold 370 can be moved between the forward position and the backward position by the cam slide mechanism as in the first embodiment. This cam slide mechanism is basically the same as the cam slide mechanism 65 of the first embodiment, and the arrangement of the cam driver and the spring (biasing means) is different from that of the cam slide mechanism 65. Since it is only the thing replaced, description is abbreviate | omitted.

  Next, the manufacturing method of the trim board 320 by the shaping | molding die 350 is demonstrated, referring drawings of FIG. 19 thru | or FIG. The manufacturing method of the trim board 320 in the present embodiment includes a first molding step for molding the first molded product 330 and a second molding step for molding the second molded product 340.

<First molding step>
First, as shown in FIG. 19, the slide mold 370 is moved to the forward movement position. Then, the side surface 372A of the slide mold 370 contacts the side surface 62D of the protrusion 62. Thereby, the first molding space 391 is formed. In this state, as shown in FIG. 19, by injecting molten resin (first resin) from a first gate (not shown) arranged in communication with the first molding space 391, the first molding space is obtained. 391 is filled with the first resin. Eventually, when the first resin cools and hardens, the first molded product 330 is molded.

<Second molding step>
After the first molded product 330 is molded, the slide mold 370 is retracted to the retracted position. Accordingly, a gap is generated between the side surface 372A of the slide mold 370 and the side surface 62D of the protrusion 62, and the second molding space 392 is formed (see FIG. 20). That is, the second molding space 392 is a space surrounded by the upper mold 61, the slide mold 370 (recess 372), and the first molded product 330.

  In this state, from a second gate (not shown) arranged in communication with the second molding space 392, the first resin that forms the first molded product 330 is made of a different material (or the same type of material). By injecting molten resin (second resin) made of different colors, the second molding space 392 is filled with the second resin (see FIG. 20). Thereby, the trim board 320 is formed in a state where the end of the first molded product 330 and the second molded product 340 are joined.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the said embodiment, although the trim board 20 which has two different colors as a multicolor molded product was illustrated, it is not limited to the trim board 20. FIG. In addition, the multicolor molded product may be formed of at least two or more colored molded products, and may be configured of three or more colored molded products.

  (2) In the above embodiment, the groove portion 23 is formed over both the main surface portion 21 and the standing wall portion 22, but the present invention is not limited to this. The trim board 20 may include, for example, an upper wall portion, and a groove portion may be formed so as to extend between the main surface portion 21 and the upper wall portion, and the groove portion may be a boundary between two colors. .

  (3) In the above embodiment, the overall shape of the slide dies 70, 270, 370 can be changed as appropriate. For example, in the molding die 50 of the first embodiment, only the forming portion (the portion indicated by the reference numeral 76 in FIG. 4) of the extending surface 71A may be a slide die.

  (4) In the above embodiment, the slide molds 70, 270, and 370 are moved by the cam slide mechanism. However, the present invention is not limited to this. For example, it is good also as a structure which moves these by attaching a cylinder apparatus (hydraulic cylinder etc.) etc. directly to the slide type | molds 70,270,370.

20, 220, 320 ... Trim board (multicolor molded product), 21 ... Main surface portion (first plate portion), 21A ... Plate surface of main surface portion (constituting part of plate surface and bent surface of first plate portion) 22 ... Standing wall part (second plate part), 22A ... Standing wall part plate surface (constituting part of plate surface and bending surface of second plate part), 23 ... Groove part, 30, 230, 330 ... First molding. Articles 31, 241, 341 ... bottom wall (wall part constituting the groove part), 32, 42, 232, 242, 332, 342 ... side wall part (wall part constituting the groove part), 40, 240, 340 ... first 2 moldings, 50, 150, 250, 350 ... molding die, 51,251, 351 ... lower die (comprising a pair of dies), 61 ... upper die (constituting a pair of dies), 65 ... cam slide mechanism, 70 , 270, 370... Slide type, 71 A... Extended surface, 91, 291, 391. 92 ... second molding space, 271A ... slide mold upper surface (extension surface extending along the extending direction of the groove), 370A ... slide mold upper surface (extension surface extending along the extending direction of the groove), S1 , S2, S3 ... gaps (openings on the second molding space side in the first molding space)

Claims (3)

A method for producing a multi-color molded product comprising a first molded product and a second molded product made of a different material or the same material and having a different color.
The multi-color molded product has a groove extending along a boundary between the first molded product and the second molded product, and the first plate portion and the first plate portion from the circumferential end of the first molded product. A second plate portion that rises in a form that bends with respect to the one plate portion, and the groove portion is formed to extend over both the first plate portion and the second plate portion. Yes,
Forming a first molding space for molding the first molded product, injecting molten resin into the first molding space, and molding the first molded product;
A second molding step of forming a second molding space for molding the second molded product, and injecting a molten resin having a color different from that of the first molded product into the second molding space to mold the second molded product. And comprising
By the first molding step and the second molding step, the wall portion constituting the groove portion is molded corresponding to the connection location between the first molding space and the second molding space,
In the first molding step, a curved surface constituted by a plate surface of the first plate portion and a plate surface of the second plate portion, which has an extended surface extending along the extending direction of the groove portion. The method for producing a multicolor molded product is characterized in that the opening on the second molding space side in the first molding space is closed by the extending surface by moving in the extending direction.   2. The method for producing a multicolor molded product according to claim 1, wherein, in the first molding step, the slide mold is slid in the extending direction of the bent surface by a cam slide mechanism. 3. A molding die for molding a multi-color molded product comprising a first molded product and a second molded product made of a different material or the same material with different colors.
The multi-color molded product has a groove extending along a boundary between the first molded product and the second molded product, and the first plate portion and the first plate portion from the circumferential end of the first molded product. A second plate portion that rises in a form that bends with respect to the one plate portion, and the groove portion is formed to extend over both the first plate portion and the second plate portion. Yes,
The mold is a pair of molds provided so as to be openable and closable,
A slide mold having an extending surface extending along the extending direction of the groove,
The first mold space for molding the first molded product and the second mold space for molding the second molded product can be formed by the pair of molds and the slide mold,
The slide mold moves in the extending direction of a bent surface constituted by the plate surface of the first plate portion and the plate surface of the second plate portion, so that the extension surface causes the above-described slide in the first molding space. A molding die characterized in that the opening on the second molding space side can be closed.

Images