JP2009202492A - Molding method of resin molded component, and molding apparatus of resin molded component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding method of a resin molded component and molding apparatus of a resin molded component which can suppress the generation of peeling and floating of a paint film formed beforehand and can inhibit the deterioration of the appearance quality of a resin molded product. <P>SOLUTION: The molding apparatus 10 of a resin molded component includes: a lower mold 21 and upper mold 22 in which molding surfaces 23, 24 for forming a cavity 31 and which can be freely opened and closed relatively; a slide block 70 which is arranged to adjoin a molding surface in the lower mold and is freely movable in a direction of mold opening and closing; a gate 32 used as an inflow opening of a molten resin material; a painting means which applies coating and forms a paint film 56; and an injection means which injects a molten resin material into a cavity. Interlocking with the mold bundle of the upper and lower molds, an end 56a of a paint film which touches the slide block is put between the slide block and the lower mold. In this condition, a molten resin material 66 is injected into a cavity, and a resin molded component united with a paint film is molded in the upper and lower molds. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for molding a resin molded product and a molding apparatus for a resin molded product.

As interior parts used in automobiles and homes, molded members with a skin having a three-layer structure of skin layer-foam layer-core material layer are frequently used. For the molding of the skin, in-mold coating technology that applies coating in the mold is applied. There are various types of in-mold coating technology. For example, a coating material is applied in a mold and a coating film is formed in advance (so-called mold coating). It has been proposed to mold a resin molded product that is injected and integrated with a coating film in a mold (see Patent Document 1).
JP 7-256695 A

  However, the flow of the molten resin material injected into the cavity may cause peeling or lifting of the previously formed coating film from the mold. When peeling or lifting of the coating film occurs, there arises a problem that the appearance quality of the resin molded product is deteriorated.

  An object of the present invention is to provide a method for molding a resin molded product and a molding apparatus for a resin molded product that can prevent the peeling and lifting of a pre-formed coating film from occurring and prevent the appearance quality of the resin molded product from being deteriorated. There is.

The present invention relates to at least one of the first and second molds that are relatively openable and closable, each having a molding surface for forming a cavity having an inner shape that matches the outer shape of the resin molded product. A molding die having a slide block arranged adjacent to the molding surface and movable in the mold opening / closing direction is in a state in which the first and second molds are opened, and the one mold in which the slide block is arranged Applying a paint to the molding surface to form a coating film;
Interlocking with the mold clamping of the first and second molds, sandwiching the end of the coating film in contact with the slide block between the slide block and the one mold;
A step of injecting a molten resin material into the cavity through a gate serving as an inlet of the molten resin material, and molding a resin molded product integrated with the coating film in the mold. This is a method of molding a product.

The present invention also includes a first mold and a second mold that are relatively openable and closable, each having a molding surface for forming a cavity having an inner shape that matches the outer shape of the resin molded product,
A slide block disposed adjacent to the molding surface of at least one of the molds and movable in a mold opening and closing direction;
A gate serving as an inlet for the molten resin material;
An application means for applying a paint to the molding surface of the one mold in which the slide block is disposed to form a coating film;
Injection means for injecting a molten resin material into the cavity through the gate,
In conjunction with the mold clamping of the first and second molds, the end of the coating film in contact with the slide block is sandwiched between the slide block and the one mold, and in this state, via the gate And a molten resin material is injected into the cavity to form a resin molded product integrated with the coating film in the first and second molds.

  According to the present invention, since the end portion of the coating film in contact with the slide block is sandwiched between the slide block and one of the molds, the preformed coating film is formed by the flow of the molten resin material injected into the cavity. The appearance quality of the resin molded product can be prevented from deteriorating without being peeled off or lifted from the mold.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a flowchart showing steps of a method for molding a resin molded product according to the embodiment. 2 is a cross-sectional view showing the molding apparatus 10 for a resin molded product according to the embodiment, FIG. 3 is a schematic perspective view showing the first mold 21 of the molding die 20, and FIG. 4 is an enlarged view of the slide block 70. 5A and 5B are cross-sectional views showing a state where the first die 21 and the second die 22 are clamped, and FIG. 5A is a cross-sectional view of FIG. FIG. 5B is a cross-sectional view corresponding to a cross section taken along line 5B, and FIG. 5B is a cross-sectional view corresponding to a cross section taken along line 5A-5A in FIG. 6-13 is sectional drawing for demonstrating the process of the shaping | molding method which concerns on embodiment.

  First, a molding apparatus 10 for a resin molded product according to the embodiment will be described.

  Referring to FIGS. 2 to 5, the molding device 10 of the resin molded product 67 is generally configured to form the cavity 31 having an inner shape that matches the outer shape of the resin molded product 67 (see FIG. 13). The first and second molds 21 and 22 that are relatively openable and closable, on which the molding surfaces 23 and 24 are formed, are disposed adjacent to the molding surface 23 of at least one of the molds 21 and are movable in the mold opening and closing direction. On the molding surface 23 of the one mold 21 on which the slide block 70, the gate 32 serving as an inlet of the molten resin material 66 (see FIG. 11, hereinafter referred to as “molten resin material 66”), and the slide block 70 are arranged. An application means 52 for applying the paint 55 to form the coating film 56 and an injection means 80 for injecting the molten resin material 66 into the cavity 31 through the gate 32 are provided. In conjunction with the clamping of the first and second molds 21 and 22, an end portion 56 a of the coating film 56 that contacts the slide block 70 (hereinafter also referred to as “coating end portion 56 a”) And sandwiched between the mold 21. Then, the molten resin material 66 is injected into the cavity 31 through the gate 32 with the coating film end 56 a sandwiched therebetween, and the resin integrated with the coating film 56 in the first and second molds 21 and 22. A molded product 67 is molded.

  In the present embodiment, the molding method and the molding apparatus for a resin molded product according to the present invention are applied to a reaction injection (RIM) molding method and a RIM molding device. Examples of the resin molded product 67 include a skin used for an interior door trim of an automobile part having a three-layer structure of a skin layer, a foam layer, and a core material layer. There are various reaction injection molding methods such as polyurethane RIM, nylon RIM, polyurea RIM, epoxy RIM, and cyclopentadiene RIM depending on the molding material. The epidermis is generally shaped by polyurethane RIM. The paint 55 and the resin material 66 are urethane materials. In the illustrated example, the lower mold 21 corresponds to “first mold 21”, “at least one mold 21”, and “one mold 21 on which the slide block 70 is arranged”, and the upper mold 22 corresponds to “second mold 21”. 22 ". Details will be described below.

  The mold 20 includes a lower mold 21, an upper mold 22 that can move toward and away from the lower mold 21, and a slide block 70 that is provided on the lower mold 21 and is movable in the mold opening and closing direction. Each of the molding surface 23 of the lower mold 21 and the molding surface 24 of the upper mold 22 has an uneven shape that matches the outer shape of the resin molded product 67. As the upper mold 22 moves toward and away from the lower mold 21, the upper and lower molds 21 and 22 open and close. The mold opening / closing direction is the vertical direction in FIG. The upper and lower molds 21 and 22 have mating surfaces 41 and 42, molding surfaces 23 and 24, gate recesses 25 and 26, and runner recesses 27 and 28. A gate recess 25 is formed in the slide block 70. By clamping the upper and lower molds 21 and 22 together, the mold 20 has a cavity 31 having an inner shape that matches the outer shape of the resin molded product 67, a gate 32 serving as an inlet for the molten resin material 66, A runner 33 that guides the molten resin material 66 to the gate 32 is formed.

  The slide block 70 is guided by a guide pin 71 provided in the lower mold 21 and moves in a mold opening / closing direction in a recess 72 formed in the lower mold 21. Between the slide block 70 and the lower mold 21, a resilient means 73 for biasing the slide block 70 with a resilient force that moves the slide block 70 toward the upper mold 22 is provided. For example, a compression coil spring is used as the elastic means 73. It is also possible to use a fluid pressure cylinder that operates by hydraulic pressure or pneumatic pressure. The slide block 70 moves to an initial position protruding from the lower mold 21 toward the upper mold 22 by the elastic force of the compression coil spring 73 in a state where the upper and lower molds 21 and 22 are opened (see FIG. 4). The slide block 70 moves while being pushed from the initial position into the lower mold 21 against the elastic force of the compression coil spring 73 in conjunction with the clamping of the upper and lower molds 21 and 22. By this movement, the slide block 70 sandwiches the coating film end portion 56a formed in advance so as to be in contact with the slide block 70 between the lower mold 21 (see FIG. 5). The coating film end 56 a is in a state of escaping into the lower mold 21 that is not affected by the flow of the molten resin material 66. Since the molten resin material 66 is injected in such a state that the coating film end portion 56a is sandwiched in this manner, the coating film end portion 56a is not exposed to the flow of the molten resin material 66, and the coating film 56 is peeled off. Can be suppressed. Furthermore, the coating film 56 is slightly pulled by sandwiching the coating film end portion 56a. The adhesion between the coating film 56 and the lower mold 21 is enhanced, and the occurrence of the lifting of the coating film 56 can be suppressed.

  A concave portion 74 is provided on a side surface of the slide block 70 facing the molding surface 23. The coating film end 56 a is formed in the recess 74 by applying the coating 55 to the recess 74. The slide block 70 is pushed and moved from the initial position until the recess 74 enters the inside of the lower mold 21 in conjunction with the mold clamping of the upper and lower molds 21 and 22. In conjunction with the mold clamping of the upper and lower molds 21 and 22, the coating film end 56 a formed in the recess 74 of the slide block 70 is sandwiched between the slide block 70 and the lower mold 21. By forming the coating film end portion 56 a in the recess 74, the coating film end portion 56 a can be securely sandwiched. In addition, by pushing the slide block 70 until the concave portion 74 enters the inside of the lower mold 21, the coating film end portion 56 a is more securely sandwiched. Note that if the slide block 70 is pushed in until the recess 74 completely enters the lower mold 21, the coating film 56 may be cut by the upper edge 75 of the recess 74. For this reason, it is necessary to push the slide block 70 to such an extent that the upper edge 75 of the recessed part 74 does not enter the inside of the lower mold | type 21. FIG.

  The coating film end portion 56a is preferably sandwiched at a portion close to the gate 32. The part close to the gate 32 is a part that is more susceptible to the flow of the resin material 66 injected into the cavity 31 than the other parts. Therefore, by sandwiching the coating film end portion 56a at a portion close to the gate 32, it is possible to effectively suppress the peeling and lifting of the coating film 56.

  With reference to FIG. 5A, a part of the slide block 70 arranged in the lower mold 21 constitutes the gate 32 together with the upper mold 22, and sandwiches the coating film end 56a facing the gate 32. The coating film end 56a is not exposed with respect to the flow of the molten resin material 66, and the coating film end 56a is sandwiched between the portions close to the gate 32. The occurrence of floating can be effectively suppressed. With reference to FIG. 5B, the slide block 70 is pushed into the lower mold 21 at a portion other than the gate 32. When the slide block 70 is pushed in, the lower surface of the gate recess 25 formed in the slide block 70 and the upper surface of the runner recess 27 formed in the lower die 21 are flush with each other (FIG. 5A). See).

  As the coating means 52, a general spray gun 52 for coating film can be used (see FIGS. 1 and 4). The coating film 56 is formed by applying the coating material 55 to the molding surface 23 of the lower mold 21 in which the slide block 70 is disposed by the coating film spray gun 52.

  As the injection means 80, a general mixing head 80 can be used (see FIG. 1). A molten resin material 66 is injected into the cavity 31 through the gate 32 by the mixing head 80.

  In order to make it easy to take out the resin molded product 67 from the mold 20, a release agent 53 is applied to the lower mold 21 and the upper mold 22 prior to application of the paint 55. The release agent 53 is applied by spraying with a release agent spray gun 51 (see FIG. 6. Note that the release agent 53 after application is omitted in the figure). For the release agent 53, for example, wax, metal soap, or silicone release agent used as a release agent for reaction injection molding can be used. In addition, it is possible to use a release agent made of thermoplastic and thermosetting resins.

  A masking jig 54 is disposed on the mating surface of the lower mold 21 and the slide block 70 in order to regulate the range in which the paint 55 is applied (see FIG. 4). The masking jig 54 has an appropriate shape, for example, a rectangular frame shape. The material of the masking jig 54 is not particularly limited, but a metal material that is easy to process and inexpensive is desirable. In the portion of the slide block 70, the masking jig 54 covers the slide block 70 from the upper surface thereof to the upper portion of the side surface where the recess 74 is formed. After the masking jig 54 is disposed, the paint 55 is applied to form the coating film 56 on the molding surface 23 of the lower mold 21, and the coating film end 56 a is formed in the recess 74 of the slide block 70. . Since the coating material 55 is applied by placing the masking jig 54 on the slide block 70, the coating material 55 is applied so that the coating film end portion 56 a is in contact with the slide block 70 by restricting the range where the coating material 55 is applied. Can do.

  Here, when the paint 55 applied to the masking jig 54 and the paint 55 applied to the slide block 70 are connected and continuous, the masking jig 54 is removed from the lower mold 21 and the slide block 70. The coating film 56 may be cut at an unintended location, and a situation may occur in which the coating film end portion 56a does not contact the slide block 70. In this case, the coating film end 56 a cannot be sandwiched between the slide block 70 and the lower mold 21. In the present embodiment, since the recess 74 is formed in the slide block 70, the step between the masking jig 54 and the slide block 70 becomes large, and the paint 55 applied to the masking jig 54 and the slide block The paint 55 applied to 70 is not connected.

  As described above, the concave portion 74 of the slide block 70 exhibits a function of preventing the paint 55 applied to the masking jig 54 and the paint 55 applied to the slide block 70 from continuing. However, when excessive paint 55 accumulates in the recess 74, the paint 55 applied to the masking jig 54 and the paint 55 applied to the recess 74 of the slide block 70 are connected, and the masking jig 54 is removed. In addition, the coating film 56 formed in the recess 74 may be pulled out of the recess 74. Therefore, it is preferable to apply the paint 55 so that the paint 55 applied to the masking jig 54 and the paint 55 applied to the concave portion 74 of the slide block 70 are discontinuous without being continuous. This is to prevent the coating film 56 formed in the recess 74 from being pulled out of the recess 74 when the masking jig 54 is removed.

  Next, the process of the resin molding product molding method according to the embodiment will be described.

  With reference to FIG. 1, the process of the molding method of the resin molded product can be summarized as a process of applying a release agent 53 to the lower mold 21 and the upper mold 22 (step S11), a mating surface 41 in the lower mold 21, and A step of placing the masking jig 54 on the slide block 70 (step S12), a step of forming the coating film 56 on the molding surface 23 of the lower mold 21 (step S13), and a step of removing the masking jig 54 (step) S14), clamping the lower mold 21 and the upper mold 22 to sandwich the coating film end 56a in contact with the slide block 70 between the slide block 70 and the lower mold 21 (step S15), and the cavity 31 A process of injecting the molten resin material 66 into the inside (step S16), a process of opening the mold 20 (step S17), and a process of taking out the resin molded product 67 It includes a (step S18), and the. This will be specifically described below.

  First, in the step S11 shown in FIG. 6, the lower mold 21 and the upper mold 22 are opened, and the release agent 53 is applied to the molding surfaces 23 and 24 of the upper and lower molds 21 and 22, respectively. The release agent 53 is applied by spraying with a release agent spray gun 51.

  Next, in the process of step S <b> 12 shown in FIG. 7, the masking jig 54 is arranged on the mating surface 41 of the lower mold 21 and the slide block 70. By disposing the masking jig 54, the range where the paint 55 is applied is regulated.

  Next, in the process of step S <b> 13 shown in FIG. 8, the coating film 56 is formed by applying the coating material 55 to the molding surface 23 of the lower mold 21. The coating film 56 is formed by spraying the coating material 55 on the lower mold 21 by the coating film spray gun 52. The paint 55 is applied to the recess 74 of the slide block 70 to form the coating film end 56 a in the recess 74. The masking jig 54 disposed on the mating surface 41 regulates the range where the coating film 56 is formed. The coating material 55 is applied so that the coating material 55 applied to the masking jig 54 and the coating material 55 applied to the concave portion 74 of the slide block 70 are discontinuous without being continuous.

  Next, in step 14 shown in FIG. 9, the masking jig 54 is removed from the lower mold 21 and the slide block 70. Since the paint 55 applied to the masking jig 54 and the paint 55 applied to the recess 74 of the slide block 70 are interrupted, the masking jig 54 is removed from the lower mold 21 and the slide block 70. In addition, the coating film 56 formed in the recess 74 is not pulled out from the recess 74.

  Next, in the process of step 15 shown in FIG. 10, the coating film end 56 a contacting the slide block 70 is moved between the slide block 70 and the lower mold 21 in conjunction with the clamping of the lower mold 21 and the upper mold 22. Sandwiched between. Specifically, the slide block 70 is pushed and moved from the initial position until the recess 74 enters the inside of the lower mold 21 in conjunction with the clamping of the upper and lower molds 21 and 22. In conjunction with the clamping of the upper and lower molds 21 and 22, the coating film end 56 a formed in the recess 74 of the slide block 70 is sandwiched between the slide block 70 and the lower mold 21. Since the coating film edge part 56a is formed in the recessed part 74, the coating film edge part 56a can be pinched reliably. Moreover, the coating film edge part 56a can be pinched more reliably by pushing the slide block 70 until the recessed part 74 enters the inside of the lower mold | type 21. FIG. By clamping the upper and lower molds 21 and 22, a cavity 31, a gate 32, and a runner are formed. A part of the slide block 70 disposed on the lower mold 21 constitutes a gate 32 together with the upper mold 22, and sandwiches a coating film end portion 56 a facing the gate 32. Since the coating film end portion 56a is sandwiched between the portions close to the gate 32, it is possible to effectively suppress the peeling and lifting of the coating film 56.

  Next, in the step 16 shown in FIG. 11, the molten resin material 66 is supplied into the mold 20. The resin material 66 is guided by the runner 33, passes through the gate 32, and is injected into the cavity 31. The injected resin material 66 is integrated with the coating film 56 in the molding die 20 and molded into a resin molded product 67 having a shape matching the inner surface shape of the cavity 31.

  Here, in FIG. 16 (A), the coating film end portion 100a is turned up when the masking jig 101 is removed from the lower mold 102 in the comparison of the form in which the end portion 100a of the coating film 100 is not sandwiched. FIGS. 16B and 16C show a state in which the coating film 100 is peeled or lifted in the vicinity of the gate 105 when the molten resin material 103 is injected into the cavity 104. Yes. As shown in the drawing, when the masking jig 101 is removed from the lower mold 102, the coating film end portion 100a may be turned up from the molding surface 106 (FIG. 16A). In this case, when the molten resin material 103 is injected into the cavity 104, the coating film 100 is peeled off in the vicinity of the gate 105 (FIG. 16B). Even when the coating film end portion 100 a does not turn over from the molding surface 106 when the masking jig 101 is removed, the coating film 56 is adjacent to the gate 105 when the molten resin material 103 is injected into the cavity 104. Rises (FIG. 16C).

  Therefore, a method of using a thermosetting resin for the paint and heating the mold itself to prevent peeling or lifting of the coating film may be used. In that case, the coating film is semi-cured by heating the mold, and the peeling or lifting of the coating film is prevented. However, since this method requires work time for heating the mold, it is difficult to shorten the processing time. If the semi-cured state of the coating film cannot be maintained, the coating film may be peeled off or lifted. It will occur.

  On the other hand, in the present embodiment, the coating film end portion 56 a in contact with the slide block 70 is sandwiched between the slide block 70 and the lower mold 21. Therefore, even when the molten resin material 66 is injected into the cavity 31, it is possible to prevent the coating film 56 from being peeled off or lifted up in the vicinity of the gate 32.

  Next, in the process of Step 17 shown in FIG. 12, after the resin material 66 is cured and the resin molded product 67 integrated with the coating film 56 is molded, the mold 20 is opened.

  Finally, in step 18 shown in FIG. 13, the resin molded product 67 is taken out. Since the peeling and lifting of the coating film 56 in the vicinity of the gate 32 are prevented, the resin molded product 67 can be molded without deteriorating the appearance quality. In the resin molded product 67, unnecessary burrs and the like are cut. As an example of the location to be cut, it is indicated by a dotted line c in the figure. In the case where burrs do not appear in the appearance of the resin molded product 67 and do not hinder the design as a product, it is not always necessary to cut the burrs.

  As described above, according to the method for molding a resin molded product and the apparatus for molding a resin molded product according to the present embodiment, the coating film end 56a that contacts the slide block 70 in conjunction with the clamping of the upper and lower molds 21 and 22. Is sandwiched between the slide block 70 and the lower mold 21, and when the molten resin material 66 is injected into the cavity 31, the coating film 56 that has been formed is peeled off or lifted off from the mold 20. This can be suppressed and deterioration of the appearance quality of the resin molded product can be prevented.

  Since the coating film end 56a formed in the recess 74 of the slide block 70 is sandwiched, the coating film end 56a can be securely sandwiched.

  Since the coating film end 56a is sandwiched at a location that is more susceptible to the flow of the injected molten resin material 66 than other portions, that is, at a location close to the gate 32, the coating film 56 may be peeled off or lifted. It can be effectively suppressed.

  A part of the slide block 70 constitutes the gate 32 together with the upper mold 22, and sandwiches the coating film end 56a facing the gate 32, so that the coating film end 56a is sandwiched at a portion close to the gate 32, Generation | occurrence | production of peeling and lifting of the coating film 56 can be suppressed effectively.

  Since the coating material 55 is applied by placing the masking jig 54 on the slide block 70, the coating material 55 is applied so that the coating film end portion 56 a is in contact with the slide block 70 by restricting the range where the coating material 55 is applied. Can do.

  Since the paint 55 and the resin material 66 are urethane materials, it is possible to mold a resin molded product 67 in which the coating film 56 and the resin material 66 are integrated without using an adhesive.

  14 is a view showing a lower mold 21 according to another embodiment, FIG. 15A is a cross-sectional view showing a state before the lower mold 21 and the upper mold 22 are clamped, and FIG. FIG. 3 is a cross-sectional view showing a state where a lower mold 21 and an upper mold 22 are clamped. In addition, the same code | symbol is attached | subjected to the member similar to previous embodiment, and the description is partially omitted.

  Referring to FIGS. 14 and 15, in the instrument panel skin mold 20, the molding surfaces 23 and 24 extend in the horizontal direction in the figure, and therefore the gate 32 also extends in the horizontal direction in FIG. 14. ing. A part of the slide block 70 constitutes the gate 32 together with the upper die 22 as in the above-described embodiment. The slide block 70 is provided so as to extend in the left-right direction in FIG. 14, and the coating film end 56a is sandwiched between the slide block 70 and the lower mold 21 over a relatively wide range. Further, the slide block 70 is formed with a sub-runner 76 (corresponding to a recess) extending in a direction in which the gate 32 extends in a region constituting the gate 32. The sub runner 76 guides the molten resin material 66 in the direction in which the gate 32 extends and injects it into the cavity 31.

  At the time of molding, the coating film end 56a facing the gate 32 is sandwiched between the slide block 70 and the lower mold 21 over a relatively wide range, so that the coating film 56 is peeled or lifted when the molten resin material 66 is injected. Can be prevented. In addition, since the molten resin material 66 is guided in the direction in which the gate 32 extends by the sub runner 76 of the slide block 70, the molten resin material 66 can be suitably injected into the cavity 31. Accordingly, it is possible to form a high-quality instrument panel while suppressing the occurrence of peeling and lifting of the coating film 56.

  Also in this embodiment, when the molten resin material 66 is injected into the cavity 31 as in the above-described embodiment, it is possible to suppress the peeling or lifting of the coating film 56 formed in advance from the mold 20. It is possible to prevent deterioration in the appearance quality of the resin molded product.

  Further, the sub-runner 76 extending along the direction in which the gate 32 extends is formed on the slide block 70, and the molten resin material 66 is guided by the sub-runner 76 in the direction in which the gate 32 extends and injected into the cavity 31. Even the resin molded product 67 having a shape can be molded by suitably injecting the molten resin material 66 into the cavity 31.

  The present invention is not limited to the above-described embodiment, and can be modified as appropriate.

  For example, the slide block 70 is arranged on the lower mold 21 to form the coating film 56, but the present invention is not limited to this case. For example, the slide block 70 may be disposed only on the upper mold 22 to form the coating film 56, or the slide block 70 may be disposed on both the upper and lower molds 21 and 22 to form the coating film 56.

  Although the case where the molding die 20 in which the gate 32 and the runner 33 are formed by clamping the upper and lower dies 21 and 22 is illustrated, for example, the gate 32 and the runner 33 are formed in one die 21 in advance. It is also possible to use a mold 20 that is present.

  The paint 55 and the resin material 66 are not limited to urethane-based materials, and materials made of other thermoplastic and thermosetting resins can also be used.

  The molding method and molding apparatus for a resin molded product according to the present invention are not used only for reaction injection molding, but after a coating film 56 is formed in advance on a plurality of dies 21 and 22 provided to be relatively openable and closable. The molds 21 and 22 are tightened, and the molten resin material 66 is injected into the cavity 65 formed in the mold 20 to be widely applicable to a molding method and a molding apparatus for obtaining a resin molded product. It is.

It is a flowchart which shows the process of the molding method of the resin molded product which concerns on embodiment. It is sectional drawing which shows the molding apparatus of the resin molded product which concerns on embodiment. It is a schematic perspective view which shows the 1st type | mold of a shaping | molding die. It is sectional drawing which expands and shows a slide block. 5A and 5B are cross-sectional views showing a state where the first die and the second die are clamped, and FIG. 5A is a cross-sectional view taken along line 5B-5B in FIG. The corresponding cross-sectional view, FIG. 5B, is a cross-sectional view corresponding to the cross section taken along line 5A-5A in FIG. It is sectional drawing for demonstrating the process (step S11) of a shaping | molding method. It is sectional drawing for demonstrating the process (step S12) of a shaping | molding method. It is sectional drawing for demonstrating the process (step S13) of a shaping | molding method. It is sectional drawing for demonstrating the process (step S14) of a shaping | molding method. It is sectional drawing for demonstrating the process (step S15) of a shaping | molding method. It is sectional drawing for demonstrating the process (step S16) of a shaping | molding method. It is sectional drawing for demonstrating the process (step S17) of a shaping | molding method. It is sectional drawing for demonstrating the process (step S18) of a shaping | molding method. The figure which shows the 1st type | mold which concerns on other embodiment. FIG. 15A is a cross-sectional view showing a state before the first mold and the second mold are clamped, and FIG. 15B is a diagram where the first mold and the second mold are clamped. It is sectional drawing which shows a state. FIG. 16A is a cross-sectional view showing a state in which the end portion of the coating film is turned up when the masking jig is removed from the lower mold in the comparison of the form in which the end portion of the coating film is not sandwiched. (B) and (C) are cross-sectional views showing a state in which the coating film is peeled off or lifted in the vicinity of the gate when the molten resin material is injected into the cavity.

Explanation of symbols

10 Molding equipment for resin molded products,
20 Mold,
21 Lower mold (first mold),
22 Upper mold (second mold),
23, 24 molding surface,
25, 26 Recess for gate,
27, 28 Runner recess,
31 cavities,
32 gates,
33 Lanna,
41, 42 mating surface,
51 Spray gun for release agent,
52 Spray gun for coating film (applying means),
53 mold release agent,
54 Masking jig,
55 paint,
56 paint film,
56a edge of the coating,
66 resin material,
67 resin molded products,
70 slide blocks,
71 guide pins,
72 recess,
73 compression coil spring,
74 recess,
75 upper edge,
76 Subrunner (dent),
80 Mixing head (injection means).

Claims (10)

A relatively openable first and second mold on which a molding surface for forming a cavity having an inner shape matching the outer shape of the resin molded product is formed; and the molding surface of at least one of the molds A molding die having a slide block arranged adjacently and freely movable in the mold opening / closing direction is in a state in which the first and second molds are opened, and the molding surface in the one mold where the slide block is arranged Applying a paint to form a coating film;
Interlocking with the mold clamping of the first and second molds, sandwiching the end of the coating film in contact with the slide block between the slide block and the one mold;
A step of injecting a molten resin material into the cavity through a gate serving as an inlet of the molten resin material, and molding a resin molded product integrated with the coating film in the mold. Molding method. Applying paint to the concave portion formed on the slide block and facing the molding surface, forming the end of the coating film in the concave portion,
The method for molding a resin molded product according to claim 1, wherein an end portion of the coating film formed in the concave portion of the slide block is sandwiched in conjunction with clamping of the first and second molds. In the state where the first and second molds are opened, the slide block is moved to an initial position protruding from the one mold toward the other mold,
The method for molding a resin molded product according to claim 1 or 2, wherein the slide block is pushed into the inside of the one mold from the initial position in conjunction with mold clamping of the first and second molds. In the state where the first and second molds are opened, the slide block is moved to an initial position protruding from the one mold toward the other mold,
The method for molding a resin molded product according to claim 2, wherein the slide block is pushed in from the initial position until the concave portion enters the inside of the one mold in conjunction with mold clamping of the first and second molds. .   The method for molding a resin molded product according to any one of claims 1 to 4, wherein the end portion of the coating film is sandwiched at a portion close to the gate.   The part of the slide block arranged in the one mold constitutes the gate together with the other mold, and sandwiches the end of the coating film facing the gate. The molding method of the resin molded product of description.   The resin molding according to claim 6, wherein the slide block is formed with a recess extending along a direction in which the gate extends, and the molten resin material is guided by the recess in a direction in which the gate extends to be injected into the cavity. Molding method.   The method for molding a resin molded product according to any one of claims 1 to 7, wherein the paint is applied after a masking jig for restricting a range in which the paint is applied is arranged on the slide block.   The method for molding a resin molded product according to any one of claims 1 to 8, wherein the paint and the resin material are urethane materials. A relatively openable first and second mold formed with a molding surface for forming a cavity having an inner shape that matches the outer shape of the resin molded product;
A slide block disposed adjacent to the molding surface of at least one of the molds and movable in a mold opening and closing direction;
A gate serving as an inlet for the molten resin material;
An application means for applying a paint to the molding surface of the one mold in which the slide block is disposed to form a coating film;
Injection means for injecting a molten resin material into the cavity through the gate,
In conjunction with the mold clamping of the first and second molds, the end of the coating film in contact with the slide block is sandwiched between the slide block and the one mold, and in this state, the gate is An apparatus for molding a resin molded product that injects a molten resin material into the cavity through the mold and molds a resin molded product integrated with the coating film in the first and second molds.

Images