JP2020116838A - Mold for in-mold coating and in-mold coating method - Google Patents

Abstract

To provide a mold for in-mold coating configured to be able to perform in-mold coating on a reinforced resin body without a coating material being leaked.SOLUTION: A block-side cavity wall surface 53 of a correction block 50 that configures an outer peripheral end of a secondary stationary-side cavity wall surface 33 of a secondary stationary mold 30 is formed with a gently deformed wall surface 53a. The gently deformed wall surface 53a is formed so that a clearance G between itself and a reinforced resin molded body S1 placed in a secondary cavity C2 becomes narrower toward an outer peripheral end edge 33a of the secondary stationary-side cavity wall surface 33. Therefore, a coating material filled into the clearance G can be effectively prevented from leaking to the outside of the secondary cavity C2 from the outer peripheral end edge 33a of the secondary stationary-side cavity wall surface 33.SELECTED DRAWING: Figure 11

Description

The present invention relates to an in-mold coating mold and an in-mold coating method.

In-mold coating technology for coating a resin molded product in a mold is known. By performing the in-mold coating, the manufacturing process can be shortened.

When performing in-mold coating, first, a resin molded body is molded by injection molding or the like. Next, the resin molded body is disposed in the cavity of the in-mold coating die, the mold is closed, and then the coating material is injected into the cavity. At this time, the low-viscosity paint may leak out from the cavity of the in-mold coating mold. Therefore, it is necessary to take measures to prevent the paint from leaking from the cavity.

Patent Document 1 proposes an in-mold coating mold in which an auxiliary cavity space is provided around the cavity and a pressing mechanism for pressing the resin filled in the auxiliary cavity space is provided. The resin (parting surface sealing member) in the auxiliary cavity space is pressed by the pressing mechanism to prevent the paint from leaking.

JP, 2009-220327, A

(Problems to be solved by the invention)
In the recent manufacturing industry, weight reduction is being promoted by replacing metal parts with resin parts. Further, when strength and rigidity are required for the parts to be replaced, a resin molded body containing a reinforcing material such as a reinforcing fiber (hereinafter, a reinforced resin molded body) is used.

When a reinforced resin molding is molded by injection molding or the like, the reinforcing material tends to be oriented in the resin flow direction during molding. When the reinforcing material in the reinforced resin molded body has orientation, the shrinkage amount of the reinforced resin molded body after molding is small in the orientation direction of the reinforcing material and large in the direction perpendicular to the orientation direction. Due to such shrinkage anisotropy, the reinforced resin molded body largely warps and deforms after molding.

When an in-mold coating of the warped and deformed reinforced resin molded body is attempted, it is highly possible that the deformed warp cannot be sufficiently corrected due to the high strength of the reinforced resin molded body itself at the time of die matching during in-mold coating. Therefore, there is a risk that the paint may leak through the gap created in the cavity due to the deformation of the reinforced resin molded body. In addition, the surface of the reinforced resin molded body may be fluffed by the reinforcing material, and in this case, there is a risk that the coating material may leak from the minute gaps formed by the fluffing of the surface. Therefore, even with the technique described in Patent Document 1, the leakage of the paint cannot be sufficiently suppressed. If the leakage of paint cannot be sufficiently suppressed, burrs will be generated from the peripheral edge of the molded product. As described above, conventionally, it has been difficult to coat the reinforced resin molded body in the mold.

Therefore, the present invention has an object to provide a mold for in-mold coating and a in-mold coating method configured so that the reinforced resin molded body can be in-mold coated without the coating material leaking. And

The present invention relates to a movable die (10) having a movable side mating surface (11), wherein a movable side parting surface (12) and a movable side cavity wall surface (13) are formed on the movable side die mating surface, A fixed mold (31) having a fixed-side mold matching surface, a fixed-side parting surface (32) and a fixed-side cavity wall surface (33) formed on the fixed-side mold matching surface, and a mold matched with a movable mold ( 30) and the fixed mold so that the paint can be injected into the cavity (C2) formed by the movable cavity wall surface and the fixed cavity wall surface when the movable mold and the fixed mold are matched. The paint injected into the cavity from the paint supply passage is formed between the reinforced resin molding (S1) disposed in the cavity and the wall surface of the fixed side cavity. Is a mold for in-mold coating configured to be able to coat a reinforced resin molded body in the mold by filling the clearance (G). Provided is an in-mold coating mold having a gradually deformable wall surface (53a) formed so that the clearance becomes narrower as it approaches the outer peripheral edge (33a).

According to the present invention, when the fixed mold and the movable mold are matched with each other, the paint is injected into the cavity formed by the cavity wall surfaces of both molds, so that the reinforced resin molded body arranged in the cavity is formed. The paint is filled in the clearance formed between the wall surface of the fixed side cavity. The surface of the reinforced resin molded body is coated with the paint thus filled in the clearance. At this time, due to the gradually deforming wall surface of the fixed-side cavity wall surface, the clearance between the reinforced resin molded body and the outer peripheral end region of the fixed-side cavity wall surface becomes closer to the outer peripheral edge of the fixed-side cavity wall surface, that is, the reinforced resin. It is formed so as to become narrower toward the peripheral edge of the molded body. In this way, the clearance in the outer peripheral end region of the cavity is narrowed as it approaches the outer peripheral edge, so that the leakage of the paint from the cavity is effectively prevented. Therefore, the in-mold coating can be applied to the reinforced resin molded body without the paint leaking from the cavity.

In this case, the fixed mold may have a plurality of straightening blocks (50) for restraining the peripheral end portion of the reinforced resin molded body. Then, it is preferable that the entire circumferential end portion of the reinforced resin molded body be constrained by the plurality of correction blocks and the gradually deforming wall surface be formed in the plurality of correction blocks. In this case, a constraining wall surface (53b) for constraining the peripheral end portion of the reinforced resin molded body may be formed in the plurality of correction blocks. According to this, the plurality of correction blocks restrain the entire peripheral end portion of the reinforced resin molded body, whereby the deformation of the reinforced resin molded body is corrected. Therefore, the clearance between the reinforced resin molded body and the wall surface of the fixed side cavity in the cavity can be maintained at an appropriate size. Therefore, the leakage of the paint due to the clearance being unnecessarily increased due to the deformation of the reinforced resin molded body is effectively prevented. Further, by forming the gradually deforming wall surface on the straightening block, the straightening block can have both the straightening function of the reinforced resin molded body and the leakage preventing function (sealing function) of the paint. Further, since the reinforced resin molded body is straightened by the straightening block, the man-hours required for designing the mold in advance during deformation of the reinforced resin molded body and the cost required for modifying the mold are significantly reduced. You can Further, by restraining the entire circumferential end portion of the reinforced resin molded body by dividing it into a plurality of straightening blocks, the reinforced resin is restrained as compared with the case where the circumferential edge portion of the reinforced resin molded body is restrained by a single mold. It is possible to straighten the entire peripheral end portion of the molded body more uniformly.

Further, in this case, the plurality of straightening blocks have predetermined clearances (clearances) between the block-side parting surface (52) that comes into contact with the movable-side parting surface and the peripheral end portion of the reinforced resin molded body arranged in the cavity. ) And the block side cavity wall surface (53) facing each other, and the gradually deforming wall surface is preferably formed on the block side cavity wall surface. Furthermore, in addition to the gradually deforming wall surface, the block-side cavity wall surface may have a constraining wall surface formed on the outer peripheral side of the gradually deforming wall surface. According to this, the reinforced resin molded body is pressed against the movable cavity wall surface by the straightening block in a state where the block side parting surface and the movable side parting surface of the straightening block are in contact with each other. The ends can be restrained.

Further, the fixed type may have a main body type (40). In this case, it is preferable that the outer peripheral end region of the fixed-side cavity wall surface is formed by a plurality of correction blocks, and the portion other than the outer peripheral end region of the fixed-side cavity wall surface is formed by the main body mold. Then, the plurality of correction blocks may be attached to the main body mold so as to be movable in the mold matching direction with respect to the main body mold. According to this, before the fixed mold and the movable mold are matched (mold closed), only the correction block is moved in a direction approaching the movable mold matching surface, and the reinforced resin attached to the movable cavity wall surface. By restraining the molded body, the deformation of the reinforced resin molded body can be corrected. After the deformation of the reinforced resin molded body is corrected by the correction block, the reinforced resin molded body in the corrected state can be placed in the cavity by matching the movable mold and the fixed mold (main mold). it can.

Further, a heater (90) may be incorporated in each of the plurality of correction blocks. According to this, by operating the heater to heat the plurality of straightening blocks, the paint filled in the clearance between the gradually deforming wall surface formed on the straightening block and the reinforced resin molded body in the cavity can be quickly removed. Can be cured. By thus quickly curing the paint, it is possible to further prevent the paint from leaking from the cavity.

Further, the present invention is an in-mold coating method using the mold for in-mold coating having the above-mentioned configuration, wherein the movable side mating surface and the fixed side mating surface are fixed so as to face each other with a predetermined gap. The moving step of moving the movable mold with respect to the mold, and the plurality of correction blocks are moved in a predetermined order in a direction approaching the movable side mating surface, so that the plurality of correction blocks attaches to the wall surface of the movable side cavity. A straightening step of restraining the peripheral end of the reinforced resin molding, a mold closing step of matching the fixed mold and the movable mold, and a paint injection step of injecting the paint into the cavity from the paint supply passage. In-mold coating method is provided.

According to the present invention, before the fixed mold and the movable mold are matched with each other (mold closed), the plurality of correction blocks are moved in a predetermined order, and the reinforced resin molding attached to the movable side cavity wall surface. By restraining the peripheral end portion of the body, the deformation of the reinforced resin molded body can be corrected. Then, after correcting the deformation of the reinforced resin molded body with the correction block, the movable mold and the fixed mold are matched with each other, and the paint is injected into the cavity, so that the surface of the reinforced resin molded body whose deformation is corrected is corrected. In-mold painting can be performed.

The moving order of the plurality of straightening blocks in the straightening step is such that when the entire circumferential end portion of the reinforced resin molded body attached to the wall surface of the movable side cavity is straightened by all the straightening blocks, the deformation of the reinforced resin molded body is the most. It can be determined by researching beforehand so that it becomes smaller. Then, the deformation of the reinforced resin molded body can be further corrected by moving the plurality of correction blocks according to the determined movement order.

FIG. 1 is a schematic cross-sectional view of a mold device including an in-mold coating mold according to this embodiment. FIG. 2 is a schematic view of the secondary fixed die as viewed from the secondary fixed side die mating surface side. FIG. 3A is an enlarged cross-sectional view of one of the correction blocks. FIG. 3B is another enlarged cross-sectional view of the correction block. FIG. 4 is a diagram showing a state in which the first movable die moving step is completed. FIG. 5 is a diagram showing a state in which the first mold closing step is completed. FIG. 6 is a diagram showing a state where the injection process is completed. FIG. 7 is a diagram showing a state in which the first mold opening step is completed. FIG. 8 is a diagram showing a state in which the second movable die moving process is completed. FIG. 9 is a diagram showing a state in which the forward movement of one straightening block is completed in the straightening step. FIG. 10 is a diagram showing a state in which the forward movement of another straightening block is completed in the straightening step. FIG. 11 is a diagram showing a state where the second mold closing step is completed. FIG. 12 is an enlarged view of part A of FIG. FIG. 13 is an enlarged view of part B of FIG. FIG. 14 is a diagram showing a state where the paint injection process is completed. FIG. 15 is an enlarged view of part C of FIG. FIG. 16 is a diagram showing a state in which the second mold opening step is completed. FIG. 17 is a diagram showing a state in which the take-out step is completed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a mold device including an in-mold coating mold according to this embodiment. This mold device includes a movable mold 10, a primary fixed mold 20, and a secondary fixed mold 30. The movable mold 10 and the secondary fixed mold 30 constitute the in-mold coating mold of the present invention.

The movable die 10 has a movable side mating surface 11. A movable parting surface 12 and a movable cavity wall surface 13 are formed on the movable side mating surface 11. The movable-side cavity wall surface 13 is formed so as to be surrounded by the movable-side parting surface 12. The primary fixed die 20 has a primary fixed side die mating surface 21. A primary fixed side parting surface 22 and a primary fixed side cavity wall surface 23 are formed on the primary fixed side mold mating surface 21. The wall surface 23 of the primary fixed side cavity is formed so as to be surrounded by the parting surface 22 of the primary fixed side. The secondary fixed die 30 has a secondary fixed side mating surface 31. A secondary fixed side parting surface 32 and a secondary fixed side cavity wall surface 33 are formed on the secondary fixed side mold matching surface 31. The secondary fixed-side cavity wall surface 33 is formed so as to be surrounded by the secondary fixed-side parting surface 32. Therefore, the secondary fixed-side cavity wall surface 33 has an outer peripheral edge 33a that forms a boundary with the secondary fixed-side parting surface 32, and the region surrounded by the outer peripheral edge 33a is the secondary fixed-side cavity. It is formed by the wall surface 33. In addition, in the secondary fixed-side cavity wall surface 33, the circumferential region near the outer peripheral edge 33 a is the outer peripheral end region of the secondary fixed-side cavity wall surface 33. The secondary fixed side parting surface 32 corresponds to the fixed side parting surface of the present invention, and the secondary fixed side cavity wall surface 33 corresponds to the fixed side cavity wall surface of the present invention.

In the movable die 10, the movable side die mating surface 11 faces the primary fixed side die mating surface 21 of the primary fixed die 20 and the movable side die mating surface 11 of the secondary fixed die 30 by a drive mechanism (not shown). It is configured to be movable between a position facing the secondary fixed-side mold mating surface 31, that is, movable in the X1 direction and the X2 direction in FIG. Further, in the movable die 10, in a state in which the movable side die mating surface 11 faces the primary fixed side die mating surface 21 of the primary fixed die 20, both die mating surfaces 11 and 21 approach each other in the first die closing direction (FIG. 1). (Y1 direction) and the first mold opening direction (Y2 direction in FIG. 1) which is separated from each other. Further, in the movable mold 10, the movable mold matching surface 11 faces the secondary fixed mold matching surface 31 of the secondary fixed mold 30, and the two mold matching surfaces 11 and 31 approach each other in the second mold closing direction ( 1) and a second mold opening direction (Z2 direction in FIG. 1) which is separated from each other.

A molten resin supply passage 25 is formed in the primary fixed die 20. The molten resin supply passage 25 includes a sprue, a runner, and a gate. One end (end on the gate side) is open to the wall surface 23 of the primary fixed side cavity, and the other end (end on the sprue side) is a primary fixed side mold. An opening is made on an outer surface 24 opposite to the mating surface 21. In the molten resin supply passage 25, the molten resin injected from the nozzle of the injection cylinder included in the injection molding device (not shown) flows from the other end side to the one end side. Further, a heater 26 is mounted around the circumference of the molten resin supply passage 25, and the heater 26 heats the molten resin flowing in the molten resin supply passage 25 so as not to solidify. That is, the molten resin supply passage 25 is configured as a passage including the hot runner.

The secondary fixed die 30 includes a main body die 40 and a plurality of correction blocks 50. The main body mold 40 has a main body side parting surface 42 and a main body side cavity wall surface 43. The main body side parting surface 42 constitutes most of the secondary fixed side parting surface 32, and the main body side cavity wall surface 43 constitutes most of the secondary fixed side cavity wall surface 33. Further, the plurality of correction blocks 50 are arranged in a portion between the main body side parting surface 42 and the main body side cavity wall surface 43. For this reason, a notch wall surface 47 for disposing the correction block 50 is formed at a boundary portion between the main body side parting surface 42 and the main body side cavity wall surface 43, and a notch wall surface 47 surrounded by the notch wall surface 47 is formed. The correction block 50 is arranged in the void space. A block side parting surface 52 and a block side cavity wall surface 53 are formed on the correction block 50. The main body side parting surface 42 and the block side parting surface 52 form the secondary fixed side parting surface 32 of the secondary fixed die 30, and the main body side cavity wall surface 43 and the block side cavity wall surface 53 form the secondary side. A secondary fixed-side cavity wall surface 33 of the fixed die 30 is configured.

In FIG. 1, two correction blocks 50 (50a, 50b) are shown. The block side parting surface 52 of the correction block 50 (50a, 50b) constitutes an inner peripheral end portion area of the secondary fixed side parting surface 32. Further, the block-side cavity wall surface 53 of the correction block 50 constitutes an outer peripheral end region of the secondary fixed-side cavity wall surface 33. In other words, the outer peripheral end region of the secondary fixed-side cavity wall surface 33 is constituted by the block-side cavity wall surface 53 of the correction block 50. The boundary between the block-side parting surface 52 and the block-side cavity wall surface 53 forms the outer peripheral edge 33a of the secondary fixed-side cavity wall surface 33. Further, the main body side parting surface 42 constitutes a portion other than the inner peripheral end portion area of the secondary fixed side parting surface 32, and the main body side cavity wall surface 43 other than the outer peripheral end portion area of the secondary fixed side cavity wall surface 33. Make up the part.

FIG. 2 is a schematic view of the secondary fixed die 30 as seen from the secondary fixed side die mating surface 31 side. As shown in FIG. 2, the plurality of correction blocks 50 are arranged along the outer peripheral edge 33 a of the secondary fixed-side cavity wall surface 33. Therefore, the outer peripheral edge 33 a of the secondary fixed-side cavity wall surface 33 is formed by the plurality of correction blocks 50.

As shown in FIG. 1, a plurality of communication passages 46 are formed in the main body die 40 of the secondary fixed die 30. The plurality of communication passages 46 are provided corresponding to the plurality of correction blocks 50, and the number thereof is the same as the number of the plurality of correction blocks 50. The communicating passage 46 opens at one end thereof to the outer surface 34 of the surface of the secondary fixed die 30 opposite to the secondary fixed side mating surface 31, and goes from the opening toward the secondary fixed side die mating surface 31. It is extended along the direction. The other end of this communication path 46 opens into a notch space surrounded by a notch wall surface 47 formed in the main body mold 40 for disposing the correction block 50.

The connecting rod 54 is inserted into each communication passage 46. One of the plurality of correction blocks 50 is connected to one end of the connecting rod 54. The other end side of the connecting rod 54 projects to the outside of the secondary fixed mold 30, and the actuator 70 as a drive mechanism is connected to the projecting end. By driving the actuator 70, the connecting rod 54 moves in the axial direction. As a result, the correction block 50 is allowed to move in the forward direction (forward movement) represented by the Z2 direction in FIG. 1 and move in the backward direction (reverse movement) represented by the Z1 direction. The actuator 70 may be a hydraulic drive mechanism (hydraulic actuator) or an electric drive mechanism (electric actuator).

The actuator 70 is electrically connected to the drive controller 80. The drive control device 80 controls the operation of the actuator 70 to control the forward movement and the backward movement of the correction block 50.

Further, a paint supply passage 45 is formed in the main body mold 40. One end of the paint supply passage 45 opens to the main body side cavity wall surface 43. The other end of the paint supply passage 45 is connected to a paint supply device 60 embedded in the main mold 40. The paint supply device 60 is filled with paint containing a thermosetting resin. When the paint supply device 60 operates, the paint filled inside is discharged to the paint supply passage 45.

FIG. 3A is an enlarged cross-sectional view of the correction block 50a shown in FIG. 3B is an enlarged cross-sectional view of the correction block 50b shown in FIG. As shown in FIGS. 3A and 3B, a recess 55 is formed in the correction block 50 (50a, 50b). The heater 90 is disposed in the recess 55. That is, the heater 90 is built in the correction block 50 (50a, 50b). The correction block 50 (50a, 50b) is heated by the operation of the heater 90. Such a heater 90 is built in all the correction blocks 50. The heating temperature of the correction block 50 by the heater 90 is, for example, 90°C to 120°C.

Further, as shown in FIGS. 3A and 3B, a gradually deforming wall surface 53a and a constraining wall surface 53b are formed on the block-side cavity wall surface 53 formed on the correction block 50 (50a, 50b). The constraining wall surface 53b is formed inward (to the right in FIGS. 3A and 3B) from the outer peripheral edge 33a in the outer peripheral end region of the secondary fixed cavity wall surface 33 formed by the block side cavity wall surface 53. It The gradually deforming wall surface 53a is formed inward from the inner end of the constraining wall surface 53b in the outer peripheral end region of the secondary fixed-side cavity wall surface 33 formed by the block-side cavity wall surface 53. FIG. 2 shows the gradually deforming wall surfaces 53a and the constraining wall surfaces 53b of the plurality of orthodontic blocks 50. As shown in FIG. 2, the outermost peripheral area of the outer peripheral end area of the secondary fixed-side cavity wall surface 33 (that is, the circular area adjacent to the outer peripheral edge 33a in the outer peripheral end area of the secondary fixed-side cavity wall surface 33). ) Is formed by the constraining wall surfaces 53 b of the plurality of correction blocks 50. In addition, in the outer peripheral end region of the secondary fixed-side cavity wall surface 33, a circular region adjacent to the inner periphery of the outermost peripheral region is formed by the gradually deforming wall faces 53a of the plurality of correction blocks 50.

The resin molding step and the in-mold coating step are performed by using the mold apparatus having the above-described configuration, whereby a resin molded article having the surface to be coated painted is manufactured. In the resin molding process, a resin molded product before coating is molded, and in the in-mold coating process, the coated surface of the resin molded product is coated. Hereinafter, these steps will be described.

The resin molding process includes a first movable mold moving process, a first mold closing process, an injection process, a pressure holding/cooling process, and a first mold opening process.

FIG. 4 is a diagram showing a state in which the first movable die moving step is completed. As shown in FIG. 4, in the first movable die moving step, the movable die 10 is moved so that the movable die mating surface 11 of the movable die 10 faces the primary fixed die mating surface 21 of the primary fixed die 20. ..

After the first movable die moving step is completed, the first die closing step is performed. FIG. 5 is a diagram showing a state in which the first mold closing step is completed. In the first mold closing step, the movable mold 10 moves from the position shown in FIG. 4 in the first mold closing direction (Y1 direction in FIG. 4). As a result, the movable-side parting surface 12 of the movable die 10 approaches the primary fixed-side parting surface 22 of the primary fixed die 20, and these parting surfaces 12 and 22 are brought into contact with each other. Thereby, the movable mold 10 and the primary fixed mold 20 are matched with each other, and the first mold closing step is completed. At this time, the primary cavity C1 is formed by the space surrounded by the movable cavity wall surface 13 of the movable die 10 and the primary fixed cavity wall surface 23 of the primary fixed die 20.

The injection process is performed after the first mold closing process is completed. FIG. 6 is a diagram showing a state where the injection process is completed. In the injection step, an injection molding device (not shown) is operated. Thereby, as shown in FIG. 6, the molten resin is supplied into the molten resin supply passage 25. The molten resin supplied into the molten resin supply passage 25 is injected from the molten resin supply passage 25 into the primary cavity C1. Here, in the present embodiment, the molten resin injected into the primary cavity C1 is made of a resin containing reinforcing fibers such as glass fibers and carbon fibers. The molten resin injected into the primary cavity C1 is filled in the primary cavity C1.

After the completion of the injection process, the pressure holding/cooling process is performed. In the pressure holding/cooling step, a predetermined pressure is applied to the molten resin filled in the primary cavity C1 and the molten resin is cooled by the movable die 10 and the primary fixed die 20. As a result, the molten resin is solidified and a reinforced resin molded body containing the reinforcing fibers is molded.

After the pressure holding/cooling process is completed, the first mold opening process is performed. FIG. 7 is a diagram showing a state in which the first mold opening step is completed. As shown in FIG. 7, in the first mold opening step, the movable mold 10 is moved in the first mold opening direction (Y2 direction in FIG. 1). As a result, the movable-side parting surface 12 of the movable die 10 separates from the primary fixed-side parting surface 22 of the primary fixed die 20 and moves in a direction away from the primary fixed-side parting surface 22. Further, the molded reinforced resin molded body S1 maintains the state of being stuck to the movable side cavity wall surface 13 of the movable mold 10. Therefore, as the movable mold 10 moves in the first mold opening direction, the reinforced resin molded body S1 is released from the primary fixed mold 20.

After the reinforced resin molding S1 is molded by performing the resin molding step as described above, the in-mold coating step is performed. The in-mold coating process includes a second movable mold moving process, a straightening process, a second mold closing process, a paint injecting process, a curing process, a second mold opening process, and a take-out process.

FIG. 8 is a diagram showing a state in which the second movable die moving process is completed. As shown in FIG. 8, in the second movable die moving step, the movable side mating surface 11 of the movable die 10 faces the secondary fixed side mating surface 31 of the secondary fixed die 30 with a predetermined space. First, the movable die 10 is moved in the X2 direction in FIG. 1 with respect to the secondary fixed die 30. This second movable die moving step corresponds to the moving step of the present invention.

The reinforced resin molded body S1 undergoes molding shrinkage from the completion of the resin molding process to the completion of the second movable die moving process. Here, the reinforcing resin molding S1 contains reinforcing fibers, and the reinforcing fibers are oriented in the flow direction of the molten resin when the molten resin is injected into the primary cavity C1 in the injection step. Further, the amount of shrinkage during molding shrinkage is small in the orientation direction of the reinforcing fibers and large in the direction perpendicular to the orientation direction of the reinforcing fibers. Due to such shrinkage anisotropy, warpage occurs in the reinforced resin molded body S1 during molding shrinkage. This warp appears largely at the peripheral end portion of the reinforced resin molded body S1. FIG. 8 shows a state in which a deformed portion D1 which is warped and deformed is formed at the upper end portion of the reinforced resin molded body S1 indicated by the broken circle P1. The deformed portion D1 is lifted up from the movable side cavity wall surface 13 as shown in FIG.

Further, when the second movable die moving step is completed, the correction block 50 of the secondary fixed die 30 facing the movable die 10 is surrounded by the notched wall surface 47 of the main body die 40 as shown in FIG. It is located in a notch space. This position is defined as the reference position of the correction block 50. When the correction block 50 is at the reference position, the block side parting surface 52 of the correction block 50 and the main body side parting surface 42 of the main body mold 40 are flush with each other. Further, when the second movable die moving step is completed, the correction block 50 at the reference position moves forward to move toward the movable side die mating surface 11 represented by the Z2 direction in FIG. 8, that is, die alignment. It can move in any direction.

The correction step is performed after the second movable die moving step is completed. In the straightening process, the plurality of straightening blocks 50 are driven by the actuator 70 to move forward from the reference position shown in FIG. 8 in a direction approaching the movable side mold matching surface 11 of the movable mold 10 (mold matching direction). When the straightening block 50 moves forward from the reference position, the straightening block 50 approaches the movable side mating surface 11 of the movable die 10, and eventually the block side parting surface 52 of the straightening block 50 moves to the movable side of the movable die 10. It comes into contact with the parting surface 12. The forward movement of the straightening block 50 is stopped when both the parting surfaces 52, 12 come into contact with each other. This completes the forward movement of the correction block 50.

FIG. 9 is a diagram showing a state in which the forward movement of one straightening block 50a is completed in the straightening step. As shown in FIG. 8, the deformed portion D1 formed at the upper end of the reinforced resin molding S1 is located at the forward movement destination of the correction block 50a. Therefore, as the straightening block 50a moves forward, the straightening block 50a comes into contact with the deformed portion D1 of the reinforced resin molding S1. When the correction block 50a further moves forward while being in contact with the deformed portion D1, the deformed portion D1 receives a pressing force from the correction block 50a. As a result, the deformation of the deformed portion D1 is corrected. When the forward movement of the correction block 50a is completed, the deformed portion D1 is restrained by the correction block 50a as shown in FIG. That is, the movement of the deformed portion D1 is restrained by the correction block 50a while being pressed against the movable cavity wall surface 13. As a result, the deformed portion D1 is corrected to the original shape (the shape at the time of molding) and contacts the movable side cavity wall surface 13.

Further, as shown in FIG. 9, when the forward movement of the correction block 50a is completed and the deformation of the deformed portion D1 is corrected, the reinforced resin molded body S1 of the reinforced resin molded body S1 is caused by the correction of the deformed portion D1. Distortion occurs at another peripheral edge portion. Therefore, another peripheral end portion of the reinforced resin molded body S1 is deformed. In FIG. 9, when the lower end portion of the reinforced resin molded body S1 is distorted, a deformed portion D2 that is deformed so as to float from the movable cavity wall surface 13 is formed at the lower end portion of the reinforced resin molded body S1. Therefore, next, in order to correct the deformed portion D2 newly deformed as described above, the correction block 50b capable of correcting the deformed portion D2 moves forward.

FIG. 10 is a diagram showing a state in which the forward movement of another straightening block 50b is completed in the straightening step. As shown in FIG. 9, the deformed portion D2 formed at the lower end portion of the reinforced resin molding S1 is located at the forward movement destination of the correction block 50b. Therefore, as the correction block 50b moves forward, the correction block 50b comes into contact with the deformed portion D2 of the reinforced resin molding S1. When the correction block 50b further moves forward while being in contact with the deformation portion D2, the deformation portion D2 receives a pressing force from the correction block 50b. As a result, the deformation of the deformed portion D2 is corrected. When the forward movement of the correction block 50b is completed, the deformed portion D2 is restrained by the correction block 50b as shown in FIG. That is, the movement of the deformed portion D2 is restrained by the correction block 50b while being pressed against the movable-side cavity wall surface 13. As a result, the deformed portion D2 is corrected to the original shape (shape at the time of molding) and comes into contact with the movable side cavity wall surface 13.

In this way, a part of the peripheral end portion of the reinforced resin molded body S1 is constrained by a certain correction block 50, and the peripheral end portion newly deformed thereby is sequentially constrained by another correction block 50, whereby all the corrections are performed. At the time when the forward movement of the block 50 is completed, the entire circumferential end portion of the reinforced resin molded body S1 attached to the movable mold cavity wall surface 12 is constrained by the correction block 50, and the deformation of the reinforced resin molded body S1 is entirely. Be corrected. In this way, the order of movement of the straightening blocks 50 that can correct the deformation of the reinforced resin molded body S1 as a whole is that all the reinforced resin molded bodies S1 attached to the movable side cavity wall surface 13 by all the straightening blocks 50. It is possible to investigate in advance by experiments or the like so that the deformation of the reinforced resin molded body S1 becomes the smallest when the deformation is corrected by restraining the peripheral end portion. By storing the movement order obtained as a result of the investigation in the drive control device 80, the plurality of correction blocks 50 can be moved forward in accordance with the predetermined movement order to correct the deformation of the reinforced resin molding S1. ..

After the correction process is completed, the second mold closing process is performed. In the second mold closing process, the second mold closing direction in which the movable mold 10 approaches the secondary fixed mold 30 while maintaining the state in which the entire circumferential end portions of the reinforced resin molded body S1 are constrained by the plurality of correction blocks 50 ( (Z1 direction in FIG. 1). As a result, the movable-side parting surface 12 of the movable die 10 and the secondary-fixed-side parting surface 32 of the secondary fixed die 30 come into contact with each other, and the movable die 10 and the secondary fixed die 30 are matched. During the execution of the second mold closing step, the operation of the actuator 70 connected to each correction block 50 is controlled so that each correction block 50 moves backward at the same speed as the moving speed of the movable mold 10. Then, when the movable mold 10 and the secondary fixed mold 30 are matched with each other, each correction block 50 returns to the reference position. The second mold closing step corresponds to the mold closing step of the present invention.

FIG. 11 is a diagram showing a state where the second mold closing step is completed. When the second mold closing step is completed, as shown in FIG. 11, the secondary cavity C2 is formed by the space surrounded by the movable side cavity wall surface 13 and the secondary fixed side cavity wall surface 33. The secondary cavity C2 corresponds to the cavity of the present invention. In this secondary cavity C2, the reinforced resin molded body S1 attached to the movable side cavity wall surface 13 is arranged. Further, the outer surface of the reinforced resin molding S1 arranged in the secondary cavity C2 (the surface opposite to the surface in contact with the movable cavity wall surface 13) and the secondary fixed side forming the secondary cavity C2. A clearance G having a minute width is formed between the cavity wall surface 33 and the cavity wall surface 33.

12 is an enlarged view of part A in FIG. 11, and FIG. 13 is an enlarged view of part B in FIG. As shown in FIGS. 12 and 13, when the block side parting surface 52 of the correction block 50 (50a, 50b) is in contact with the movable side parting surface 12, the block of the correction block 50 (50a, 50b). The constraining wall surface 53b formed on the side cavity wall surface 53 is in contact with the peripheral end portion of the surface of the reinforced resin molding S1. By such contact, the peripheral end portion of the reinforced resin molded body S1 is restrained by the correction block 50. The constraining wall surface 53b is formed on all of the block-side cavity wall surfaces 53 of the plurality of correction blocks 50. Therefore, the plurality of straightening blocks 50 restrain the entire peripheral end portion and correct the shape. It should be noted that such correction of the reinforced resin molded body S1 is completed by performing the above-described correction process before performing the second mold closing process.

Further, the gradually deforming wall surface 53a formed inside the constraining wall surface 53b of the block side cavity wall surface 53 of the correction block 50 (50a, 50b) is a reinforced resin molded body arranged in the secondary cavity C2. It faces the surface of S1 with a predetermined clearance (G1, G2). The dimension of this clearance (G1, G2) (specifically, the length of the clearance (G1, G2) in the normal direction of the surface of the reinforced resin molded body S1) becomes closer to the outer end of the block side cavity wall surface 53. It has been made smaller. The outer end of the block-side cavity wall surface 53 is the outer peripheral edge 33 a of the secondary fixed-side cavity wall surface 33. That is, the clearances (G1, G2) are narrowed toward the outer peripheral edge 33a of the secondary fixed-side cavity wall surface 33. In other words, the gradually deforming wall surface 53a of the block side cavity wall surface 53 of the correction block 50 (50a, 50b) becomes narrower as the clearance (G1, G2) approaches the outer peripheral edge 33a of the secondary fixed side cavity wall surface 33. So that it is formed. In other words, the clearance (G1, G2) of the block side cavity wall surface 53 forming the outer peripheral end region of the secondary fixed side cavity wall surface 33 becomes narrower as it approaches the outer peripheral edge 33a of the secondary fixed side cavity wall surface 33. It has a gradually deforming wall surface 53a formed as described above. The gradually deforming wall surface 53a having such a configuration is formed on all of the block-side cavity wall surfaces 53 of the plurality of correction blocks 50. Therefore, the clearance G is reduced over the entire circumference of the reinforced resin molding S1 toward the peripheral edge.

After the second mold closing step is completed, the paint injection step is performed. In the paint injection step, the paint R containing the thermosetting resin is injected from the paint supply device 60 into the secondary cavity C2 via the paint supply passage 45. FIG. 14 is a diagram showing a state where the paint injection process is completed. As shown in FIG. 14, the paint R injected into the secondary cavity C2 is filled in the clearance G formed between the secondary fixed-side cavity wall surface 33 and the outer surface of the reinforced resin molding S1. As a result, the coating material R is applied to the outer surface (surface to be coated) of the reinforced resin molding S1.

FIG. 15 is an enlarged view of part C of FIG. As shown in FIG. 15, the paint R is also filled in the clearance between the gradually deforming wall surface 53a of the block-side cavity wall surface 53 and the outer surface of the reinforced resin molding S1. Here, as described above, the gradually deforming wall surface 53a of the block side cavity wall surface 53 of the correction block 50 (50a) is formed so that the clearance becomes narrower as it approaches the outer peripheral edge 33a of the secondary fixed side cavity wall surface 33. Therefore, the cross-sectional area of passage of the paint R decreases as the paint R moves toward the peripheral edge of the outer surface of the reinforced resin molding S1. Therefore, the cross-sectional area through which the paint R passes at the peripheral end portion of the reinforced resin molding S1 becomes extremely small, and as a result, the paint R is effectively prevented from leaking from the secondary cavity C2. In addition, the straightening block 50 (50a) has a built-in heater 90, and the heater 90 operates to heat the straightening block 50 to, for example, 90° C. to 120° C. during the paint injection process. Therefore, the paint containing the thermosetting resin filled in the narrow clearance between the gradually deforming wall surface 53a of the block-side cavity wall surface 53 and the reinforced resin molding S1 is instantly heated and hardened by the heat of the correction block 50. For this reason, leakage of the paint is more effectively prevented.

As described above, the gradually deforming wall surface 53a is formed on the block-side cavity wall surfaces 53 of all the correction blocks 50. Further, the constraining wall surfaces 53b formed on all the correction blocks 50 constrain the entire peripheral end portion of the reinforced resin molded body S1. Therefore, the clearance formed in the secondary cavity C2 is narrowed over the entire circumference of the reinforced resin molding S1 as it approaches the circumferential end. That is, the gradually deforming wall surfaces 53a of all the correction blocks 50 form a seal structure for preventing the leakage of the paint R over the entire circumference of the reinforced resin molding S1. Therefore, the leakage of the coating material from the secondary cavity C2 is prevented over the entire circumference of the reinforced resin molded body S1.

The curing process is performed after the paint injection process is completed. In this curing step, the paint R filled in the clearance G of the secondary cavity C2 is cured by the heat of the main body mold 40. The paint R filled in the clearance between the reinforced resin molding S1 and the block-side cavity wall surface 53 (gradually deformable wall surface 53a) of the correction block 50 is already hardened as described above. The outer surface (the surface to be coated) of the reinforced resin molded body S1 is coated by curing the coating material in this curing step.

After the curing process is completed, the second mold opening process is performed. In the second mold opening step, the movable mold 10 is separated from the secondary fixed mold 30. FIG. 16 is a diagram showing a state in which the second mold opening step is completed. As shown in FIG. 16, when the movable die 10 moves in the second die opening direction (Z2 direction in FIG. 1) and separates from the secondary fixed die 30 in the second die opening step, the outer surface (coated surface). The reinforced resin molded body S2 coated with is moved together with the movable die 10 while being stuck to the movable side cavity wall surface 13. As a result, the reinforced resin molded body S2 is released from the secondary fixed mold 30.

After the second mold opening process is completed, the take-out process is performed. FIG. 17 is a diagram showing a state in which the take-out step is completed. As shown in FIG. 17, when the take-out step is performed, the eject pin (not shown) projects from the movable cavity wall surface 13, whereby the reinforced resin molded body S2 is released from the movable die 10. As a result, the reinforced resin molded body S2 is taken out.

As described above, the in-mold coating mold according to this embodiment includes the movable mold 10 and the secondary fixed mold 30. The movable die 10 has a movable side mating surface 11, and a movable parting surface 12 and a movable side cavity wall surface 13 are formed on the movable side mating surface 11. The secondary fixed die 30 has a secondary fixed side mating surface 31, a secondary fixed side parting surface 32 and a secondary fixed side cavity wall surface 33 are formed on the secondary fixed side die mating surface 31. , The mold is matched with the movable mold 10. Further, a paint supply passage 45 is formed in the secondary fixed mold 30. The paint supply passage 45 injects the paint R into the secondary cavity C2 formed by the movable side cavity wall surface 13 and the secondary fixed side cavity wall surface 33 when the movable die 10 and the secondary fixed die 30 are matched. Configured to be able to. Then, the paint R injected into the secondary cavity C2 from the paint supply passage 45 enters the clearance G formed between the reinforced resin molding S1 arranged in the secondary cavity C2 and the fixed-side cavity wall surface 33. By being filled and applied to the outer surface of the reinforced resin molded body S1, the reinforced resin molded body S1 can be coated in the mold.

In addition, a gradually deforming wall surface 53a is formed on the block-side cavity wall surface 53 of the correction block 50 that constitutes the outer peripheral end region of the secondary-fixing-side cavity wall surface 33 of the secondary fixed die 30. This gradually deformable wall surface 53a has a clearance G between the reinforced resin molding S1 disposed in the secondary cavity C2 and the outer end of the block side cavity wall surface 53 (that is, the outer periphery of the secondary fixed side cavity wall surface 33). It is formed so as to become narrower as it approaches the edge 33a). Therefore, it is possible to effectively prevent the paint with which the clearance G is filled from leaking from the outer end of the block side cavity wall surface 53 (the outer peripheral edge 33a of the secondary fixed side cavity wall surface 33) to the outside of the secondary cavity C2. be able to.

Further, the secondary fixed die 30 has a plurality of correction blocks 50 that restrain the peripheral end portion of the reinforced resin molded body S1. Then, the plurality of orthodontic blocks 50 (specifically, the constraining wall surfaces 53b formed on the block-side cavity wall surface 53 of the orthodontic block 50) constrain the entire peripheral end portion of the reinforced resin molded body S1, and the gradually deforming wall surface. 53 a is formed on the plurality of correction blocks 50. Therefore, the straightening block 50 can correct the deformation of the reinforced resin molded body S1, and the clearance G between the reinforced resin molded body S1 and the secondary fixed side cavity wall surface 33 in the secondary cavity C2 can be reduced. It can be kept at a proper size. Therefore, the leakage of the coating material R due to the clearance G becoming larger than necessary due to the deformation of the reinforced resin molded body S1 is effectively prevented. Further, by forming the gradually deforming wall surface 53a on the block-side cavity wall surface 53 of the straightening block 50, the straightening block 50 has both the straightening function of the reinforced resin molding S1 and the leakage preventing function (sealing function) of the paint R. You can In addition, by restraining the entire circumferential end portion of the reinforced resin molded body S1 by dividing it into a plurality of correction blocks 50, as compared with the case where the circumferential edge portion of the reinforced resin molded body is restrained by a single mold, The entire peripheral end portion of the reinforced resin molding S1 can be straightened more uniformly.

The secondary fixed die 30 has a main body die 40. Further, the inner peripheral end region of the secondary fixed side parting surface 32 and the outer peripheral end region of the secondary fixed side cavity wall surface 33 are formed by the block side parting surface 52 and the block side cavity wall surface 53 of the plurality of correction blocks 50. The part other than the inner peripheral end region of the secondary fixed side parting surface 32 and the part other than the outer peripheral end region of the secondary fixed side cavity wall surface 33 are the main body side parting surface 42 of the main body mold 40 and the main body side cavity. It is formed by the wall surface 43. The plurality of correction blocks 50 are attached to the main body mold 40 so as to be movable in the mold matching direction (forward direction) with respect to the main body mold 40. With this configuration, only the correction block 50 is moved forward and the reinforcement is attached to the movable cavity wall surface 13 before the secondary fixed mold 30 and the movable mold 10 are matched (mold closed). The deformation of the resin molded body S1 can be corrected. After the deformation of the reinforced resin molded body S1 is corrected by the correction block 50, the movable mold 10 and the secondary fixed mold 30 are matched with each other to form a mold on the outer surface of the reinforced resin molded body S1 whose deformation is corrected. Inner coating can be performed.

Further, the heater 90 is built in each of the plurality of correction blocks 50. Therefore, by operating the heater 90 to heat the plurality of straightening blocks 50, the clearance between the gradually deforming wall surface 53a formed in the straightening block 50 and the reinforced resin molded body S1 in the secondary cavity C2 is set. The filled paint R can be quickly cured. This can further prevent the paint R from leaking from the secondary cavity C2.

Although the embodiments of the present invention have been described above, the present invention should not be construed as being limited to the above embodiments. The present invention can be modified without departing from the technical idea or the main features thereof.

10... Movable mold, 11... Movable side mold mating surface, 12... Movable side parting surface, 13... Movable side cavity wall surface, 20... Primary fixed mold, 21... Primary fixed side mold mating surface, 22... Primary fixed side parting Surface, 23... Primary fixed side cavity wall surface, 25... Molten resin supply passage, 30... Secondary fixed type (fixed type), 31... Secondary fixed side mating surface (fixed side mating surface), 32... Secondary fixing Side parting surface (fixed side parting surface), 33... Secondary fixed side cavity wall surface (fixed side cavity wall surface), 33a... Outer peripheral edge, 40... Main body mold, 42... Main body side parting surface, 43... Main body side Cavity wall surface, 45... Paint supply passage, 46... Communication passage, 50, 50a, 50b... Straightening block, 52... Block side parting surface, 53... Block side cavity wall surface, 53a... Gradual deformable wall surface, 53b... Restraint wall surface, 54... Connection rod, 60... Paint supply device, 70... Actuator, 80... Drive control device, 90... Heater, C1... Primary cavity, C2... Secondary cavity, G, G1, G2... Clearance, R... Paint, S1, S2... Reinforced resin molding

Claims (5)

A movable die having a movable side mating surface, wherein a movable parting surface and a movable cavity wall surface are formed on the movable side mating surface;
A fixed mold having a fixed-side mold mating surface, wherein a fixed-side parting surface and a fixed-side cavity wall surface are formed on the fixed-side mold mating surface, and the mold is matched with the movable mold;
The fixed mold is formed so that the paint can be injected into the cavity formed by the movable cavity wall surface and the fixed cavity wall surface when the movable mold and the fixed mold are matched. Paint supply passage,
The paint injected into the cavity from the paint supply passage is filled in a clearance formed between the reinforced resin molded body arranged in the cavity and the wall surface of the fixed side cavity. A mold for in-mold coating configured to be able to coat a reinforced resin molded body in the mold,
An in-mold coating die, wherein the fixed-side cavity wall surface has a gradually deformable wall surface that is formed in an outer peripheral end region thereof and that the clearance becomes narrower toward the outer peripheral edge. The in-mold coating mold according to claim 1,
The fixed mold has a plurality of correction blocks for constraining the peripheral end portion of the reinforced resin molded body,
An in-mold coating die in which the entire circumferential end portion of the reinforced resin molded body is constrained by the plurality of correction blocks, and the gradually deforming wall surface is formed in the plurality of correction blocks. The in-mold coating die according to claim 2,
The fixed type has a main body type,
An outer peripheral end region of the fixed side cavity wall surface is formed by a plurality of the correction blocks,
A portion other than the outer peripheral end region of the fixed-side cavity wall surface is formed by the main body mold,
An in-mold coating mold, wherein a plurality of the correction blocks are attached to the main body mold so as to be movable in the mold matching direction with respect to the main body mold. The in-mold coating mold according to any one of claims 2 to 4,
An in-mold coating mold in which a heater is built in each of the plurality of correction blocks. An in-mold coating method using the mold for in-mold coating according to claim 3,
A moving step of moving the movable die with respect to the fixed die so that the movable die mating surface and the fixed die mating surface face each other with a predetermined gap;
By moving the plurality of straightening blocks in a direction approaching the movable side mold matching surface in a predetermined order, the circumference of the reinforced resin molded body attached to the movable side cavity wall surface by the plurality of straightening blocks is moved. A straightening process to restrain the ends,
A mold closing step of matching the fixed mold and the movable mold,
A paint injection step of injecting paint into the cavity from the paint supply passage,
In-mold coating method including.

Images