JP6927872B2 - Composite resin molded product - Google Patents

Description

The present invention relates to a composite resin molded product in which a plurality of molded products formed of resin materials having different characteristics are integrated.

For automobile parts, electric parts, various design parts, and the like, composite resin molded products in which a plurality of molded bodies made of resin materials having different characteristics are integrated are often used.
As a method for producing such a composite resin molded product, a method for producing a target composite resin molded product by two-color molding (two-color injection molding) using injection molding is known (for example, Patent Document 1). reference).

In the composite resin molded product described in Patent Document 1, the primary molded body is composed of a light-impermeable colored frame, and the secondary molded body covers the entire opening of the frame while the opening of the frame is covered. It is composed of a colorless and transparent covering body that is integrally bonded to the peripheral portion.
In the production of this composite resin molded product, a colored frame is formed by a primary mold, and then a colorless and transparent covering body is formed by a secondary mold so as to cover the upper surface side of the frame. The injection gate of the secondary mold forming the covering body is set on a surface other than the product design surface of the covering body. As a result, no gate marks appear on the product design surface of the molded covering. Further, the injection gate of the primary mold forming the frame body is set on the surface to be covered by the covering body later. Therefore, even if a gate mark remains on the outer surface of the frame body, the gate mark is covered with the covering body and is hardly noticeable.

Japanese Unexamined Patent Publication No. 2009-006533

The composite resin molded product described in Patent Document 1 has a laminated structure in which the surface of the primary molded body (frame body) is covered with the secondary molded body (coating body). Therefore, it is possible to prevent the gate mark at the time of molding from appearing on the product design surface. However, in the case of a composite resin molded product in which both the primary molded product and the secondary molded product constitute the product design surface, if the portion where the gate mark remains is arranged at a position inconspicuous from the outside, other problems may occur. be.

For example, in the case of a composite resin molded product in which the secondary molded product is arranged in parallel in the inner region surrounded by the primary molded product, if the injection gate forming the secondary molded product is set at a position avoided from the design surface. , A slit is formed in the side piece of the primary molded body so as to divide a part of the side piece, and when the secondary molded body is molded, the resin must be introduced into the main body of the secondary molded body through the slit. No. In this case, since the injection gate of the secondary mold can be set at the end of the slit of the primary molded body, no gate mark appears on the product design surface of the completed composite resin molded product.

However, when a slit is formed in the side piece of the primary molded body and the resin material is introduced into the region corresponding to the main body of the secondary molded body through the slit, the rigidity of the side piece of the primary molded body is extremely lowered. , It promotes the deformation of the primary molded body. Further, when the secondary molded product is injection-molded, the possibility that the divided portion of the side piece is displaced due to the flow pressure of the resin increases, which hinders the production of a homogeneous product.

Therefore, the present invention is intended to provide a composite resin molded product capable of obtaining good appearance quality while suppressing a decrease in rigidity of a side piece of a primary molded body.

The composite resin molded product according to the present invention adopts the following configuration in order to solve the above problems.
That is, the composite resin molded product according to the present invention is a plate-shaped primary molded product made of a first resin material (for example, the primary molded product 21 of the embodiment) and a plate-shaped secondary molded product made of a second resin material. In a composite resin molded product in which a molded body (for example, the secondary molded body 22 of the embodiment) is integrated and both the primary molded body and the secondary molded body form a product design surface, the primary molding The body has a side piece (for example, the upward extending wall 11f-2 of the embodiment) adjacent to the main body part (for example, the main body part 22a of the embodiment) of the secondary molded body, and the side piece is said. A communication groove (for example, the communication groove 23 of the embodiment) that communicates one side portion adjacent to the main body portion of the secondary molded body and the other side portion on the opposite side of the one side portion is provided on one side in the plate thickness direction. The secondary molded body has the main body portion and the crossing portion (one end connected to the main body portion and the other end facing the outside of the other side portion of the side piece) by being filled in the communication groove. For example, the cross section 22b of the embodiment), and the primary molded body has a flange portion (for example, of the embodiment) along the boundary portion in the vicinity of the boundary portion with the main body portion of the secondary molded body. It is characterized by having a flange portion 24).

With the above configuration, it becomes possible to set an injection gate for molding the secondary molded body at the outer end of the communication groove of the primary molded body. In this case, after molding the composite resin molded product, the gate mark of the secondary molded product appears at the outer end of the crossing portion, so that the gate mark is difficult to see from the outside. Further, in the case of the above configuration, the side piece of the primary molded body is provided with a communication groove on only one side in the thickness direction, and a part of the side piece is not divided. Therefore, it is possible to suppress a decrease in the rigidity of the side piece of the primary molded body.

Further, in this case, the rigidity in the vicinity of the boundary portion of the primary molded body with the main body portion of the secondary molded body can be increased by the flange portion. Further, after the primary molded body is molded, when the second resin material for forming the secondary molded body is injected into the mold, the flange portion of the primary molded body is stably held by the mold. Therefore, it is possible to prevent the primary molded body from being displaced due to the injection pressure of the resin.

The flange portion may be connected to the side walls facing each other of the communication groove so as to straddle the communication groove.
In this case, the communication groove of the primary molded body, which is the flow path of the second resin material at the time of molding the secondary molded body, is reinforced by the flange portion. Therefore, it is possible to prevent the communication groove portion of the primary molded body from being deformed during molding of the secondary molded body. Therefore, when this configuration is adopted, the product quality of the composite resin molded product can be stabilized.

In the communication groove, in the region crossing the groove straddling portion of the flange portion (for example, the groove straddling portion 24a of the embodiment), the penetrating portion communicating with the other side in the thickness direction of the side piece (for example, the embodiment). The penetrating portion 50) may be formed.
In this case, since the undercut portion is not formed in the region crossing the groove straddling portion of the flange portion, it is possible to form the primary molded body without using the slide mold. Therefore, when this configuration is adopted, the molding die can be simplified.

The second resin material may be formed of a resin material that is softer than the first resin material.
In this case, after the primary molded body is formed of the hard first resin material, the soft second resin material is stabilized in the molded portion of the main body of the secondary molded body through the communication groove of the side piece of the primary molded body. Can be filled. Therefore, when this configuration is adopted, the product quality of the composite resin molded product can be stabilized.

The plate-shaped main body of the secondary molded body may extend along the load input direction from the outside.
In this case, when a load is applied to the plate-shaped main body of the secondary molded body from the outside, the soft secondary molded body is easily bent and deformed, and the input impact can be mitigated.

According to the present invention, it is possible to set an injection gate for molding the secondary molded body at the outer end of the communication groove of the primary molded body without dividing a part of the side piece of the primary molded body. Therefore, good appearance quality can be obtained while suppressing a decrease in rigidity of the side piece of the primary molded product.

It is a perspective view of the cowl top garnish of one Embodiment of this invention. It is a perspective view of the 1st garnish of one Embodiment of this invention. It is sectional drawing corresponding to the section III-III of FIG. 1 of the cowl top garnish of one embodiment of this invention. It is sectional drawing which follows the IV-IV line of FIG. 2 of the 1st garnish of one Embodiment of this invention. It is a schematic bottom view of the molding die which manufactures the 1st garnish of one Embodiment of this invention. It is sectional drawing which follows the VI-VI line of FIG. 5 of the molding die of one Embodiment of this invention. It is sectional drawing which follows the line VII-VII of FIG. 5 of the molding die of one Embodiment of this invention. It is sectional drawing which follows the line VIII-VIII of FIG. 5 of the molding die of one Embodiment of this invention. It is sectional drawing corresponding to FIG. 7 of the basic embodiment of the molding die of another embodiment of this invention. It is sectional drawing corresponding to FIG. 8 of the basic embodiment of the molding die of another embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a view of the cowl top garnish 10 of the embodiment viewed from diagonally above the front left side of the vehicle, and FIG. 2 is a view of the first garnish 11 which is a component of the cowl top garnish 10 as viewed from above the front side of the vehicle. It is a figure. Further, FIG. 3 is a diagram showing a cross section corresponding to the cross section III-III of FIG. 1, and FIG. 4 is a diagram showing a cross section taken along the line IV-IV of FIG. In addition, an arrow FR pointing to the front of the vehicle, an arrow UP pointing to the upper side of the vehicle, and an arrow LH pointing to the left side of the vehicle are written at appropriate positions in the drawing.
As shown in FIG. 3, a cowl portion 2 extending along the vehicle width direction is installed above the rear portion of the engine room 1 of the vehicle. The cowl portion 2 is formed by combining a metal cowl top panel 4 arranged below the front edge portion of the front windshield glass 3 and a metal body panel 5 arranged below the front portion of the cowl top panel 4. Is formed. The cowl portion 2 is formed in a gutter shape that opens upward by connecting the cowl top panel 4 and the body panel 5 to each other.

An air intake portion of an air conditioner (not shown) that introduces outside air into the vehicle interior is connected to the cowl portion 2, and a drive motor or the like of a wiper device (not shown) is arranged.
A trailing edge flange 4r inclined upward and rearward extends from the trailing edge of the cowl top panel 4, and a separate metal panel member 8 is connected to the upper part of the trailing edge flange 4r. The leading edge of the front windshield glass 3 is fixed to the upper surface of the panel material 8 with a rubbery adhesive that can adhere to the liquid tightly.

Further, above the engine room 1, a bonnet hood 6 that covers the upper part of the engine room 1 so as to be openable and closable is arranged. The bonnet hood 6 has a hood outer portion 6a that faces upward with the engine room 1 closed, and a hood inner portion 6b that forms a substantially closed cross section between the lower surface of the hood outer portion 6a.

A cowl top garnish 10 mainly made of resin is attached to the upper portion of the cowl portion 2 so as to close between the trailing edge portion of the bonnet hood 6 and the lower edge portion of the front windshield glass 3. The cowl top garnish 10 is formed in the shape of a long substantially plate having the vehicle width direction as the longitudinal direction along the cowl portion 2. The cowl top garnish 10 improves the appearance of the area between the bonnet hood 6 and the front end portion of the front windshield glass 3 with the bonnet hood 6 closed.

As shown in FIG. 3, the central region of the cowl top garnish 10 in the vehicle width direction is formed in a substantially hat-shaped cross-sectional shape in which the cross section in the front-rear direction of the vehicle body is convex upward. Specifically, the central region of the cowl top garnish 10 includes a convex cross-section portion 14a that rises upward, a front flange 14f extending to the front portion of the convex cross-section portion 14a, and a rear portion of the convex cross-section portion 14a. It has a rear flange 14r, which is extended to. A seal support flange 16 projects upward from the front end of the convex cross-sectional portion 14a. A seal member 17 having a hollow cross section is attached to the seal support flange 16 to seal between the bonnet hood 6 and the lower surface of the bonnet hood 6 when the bonnet hood 6 is closed.

The front flange 14f of the cowl top garnish 10 is overlapped with the upper surface of the front flange 19f provided on the leading edge of the body panel 5, and the body panel is formed by a hook (not shown) integrally formed with the front flange 14f of the cowl top garnish 10. It is detachably locked to the leading flange 19f of 5. A sealing member 20 for blocking hot air and odor from the engine room 1 is interposed between the front flange 14f of the cowl top garnish 10 and the front flange 19f of the body panel 5.
Further, the rear flange 14r of the cowl top garnish 10 is overlapped with the upper surface of the front edge portion of the front windshield glass 3 and is locked and fixed to the panel material 8 via a locking clip (not shown) in that state.

Here, the central region of the cowl top garnish 10 in the vehicle width direction is composed of a first garnish 11 on the front side of the vehicle and a second garnish 12 on the rear side of the vehicle with the seal support flange 16 as a boundary. The first garnish 11 is made of a plate-shaped primary molded body 21 made of the first resin material R1 and a second resin material R2 (elastic rubbery resin material) softer than the first resin material R1. The secondary molded body 22 is integrally formed by two-color molding. The first garnish 11 and the second garnish 12 have flange halves 11f and 12f, respectively, and these flange halves 11f and 12f are overlapped in the thickness direction and joined to each other by adhesion or the like. The seal support flange 16 is configured by joining flange halves 11f and 12f.
In the present embodiment, the first garnish 11 constitutes a composite resin molded product.

The first garnish 11 includes a front wall portion 11a forming the front wall of the convex cross-sectional portion 14a of the cowl top garnish 10 and the above-mentioned flange half body extending upward after being inclined obliquely forward from the upper end of the front wall portion 11a. It mainly includes 11f, a lower wall portion 11b extending forward from the lower end of the front wall portion 11a, and a bent wall portion 11c bent downward at a substantially right angle from the end portion of the lower wall portion 11b. The lower wall portion 11b constitutes the front flange 14f of the cowl top garnish 10.
More specifically, as shown in FIG. 4, the flange half body 11f is formed from the inclined wall 11f-1 extending diagonally upward from the upper end of the front wall portion 11a and the upper end of the inclined wall 11f-1. It has an upward extending wall 11f-2 that bends upward and extends.

The first garnish 11 of the present embodiment is formed of a second resin material R2 in which the central region of the front wall portion 11a and the inclined wall 11f-1 in the vehicle width direction is soft. The portion formed by the second resin material R2 of the front wall portion 11a and the inclined wall 11f-1 constitutes the main body portion 22a of the secondary molded body 22. Most of the remainder of the first garnish 11 except for the main body portion 22a of the secondary molded body 22 is formed of the hard first resin material R1. However, a strip-shaped crossing portion 22b made of a soft second resin material R2 is arranged in a part of the central region of the upward extending wall 11f-2 in the vehicle width direction. The crossing portion 22b is formed to have a thickness of about half of the entire upward extending wall 11f-2, one end of which is connected to the main body portion 22a of the secondary molded body 22, and the other end of the upward extending wall 11f-2. It faces the outside (upward).
In the present embodiment, the secondary molded body 22 is composed of the main body portion 22a and the crossing portion 22b, and the remaining portion of the first garnish 11 is the primary molded body 21. Further, in the case of the present embodiment, the region of the upper extending wall 11f-2 of the first garnish 11 excluding the crossing portion 22b constitutes a side piece adjacent to the main body portion 22a of the secondary molded body 22. ..

A communication groove 23 in which the crossing portion 22b is received is formed in a part of the central region of the upper extending wall 11f-2 of the first garnish 11 in the vehicle width direction. The communication groove 23 is provided on one side (front side of the vehicle) of the upper extending wall 11f-2 in the plate thickness direction, and extends from the lower end to the upper end of the upper extending wall 11f-2. The communication groove 23 is filled with the second resin material R2 at the time of molding the secondary molded body 22. As a result, the above-mentioned crossing portion 22b is formed in the communication groove 23. As will be described in detail later, the communication groove 23 also serves as a passage for filling the main body portion 22a of the secondary molded body 22 with the second resin material R2 at the time of molding the secondary molded body 22.

Further, a flange portion 24 having a relatively narrow protrusion width is projected forward in the vicinity of the boundary portion between the upward extending wall 11f-2 of the first garnish 11 and the inclined wall 11f-1. .. The flange portion 24 is continuously formed along the vehicle width direction on the front surface side of the upward extending wall 11f-2. The flange portion 24 is formed of a hard first resin material R1 and is continuously provided at the opening-side end of the side wall facing each other of the communication groove 23 so as to straddle the communication groove 23 in the vehicle width direction. There is. Hereinafter, the region of the flange portion 24 facing the communication groove 23 is referred to as a groove straddling portion 24a.
The flange portion 24 constitutes a part of the primary molded body 21, and is provided near the boundary portion of the secondary molded body 22 with the main body portion 22a along the boundary portion.

Further, a bent piece 25 having a narrow extending width bent toward the rear side of the vehicle is projected from the upper end portion of the upper extending wall 11f-2 of the first garnish 11. The bent piece 25 is also integrally formed at the upper end of the cross section 22b made of the soft second resin material R2. When the first garnish 11 and the second garnish 12 are abutted against the flange halves 11f and 12f and joined to the bent piece 25, the end surface of the flange halves 12f of the second garnish 12 is abutted against the bent piece 25.
Reference numeral 26 in FIG. 4 is a protrusion for preventing misalignment, which is projected from the primary molded body 21 portion near the lower end of the front wall portion 11a. The ridge 26 is locked to the mold when the primary molded body 21 is set in the mold, as will be described in detail later.

A part of the inclined wall 11f-1 and the front wall portion 11a of the first garnish 11 is composed of a secondary molded body 22 made of a soft second resin material R2 to form a main body portion 22a of the secondary molded body 22. ing. The main body 22a of the secondary molded body 22 extends in a substantially vertical direction with the cowl top garnish 10 attached to the vehicle body. Therefore, when a downward load is input to the upper surface of the bonnet hood 6, the load is input to the main body portion 22a of the secondary molded body 22 along the extending direction of the main body portion 22a. .. Therefore, at this time, the portion composed of the soft secondary molded body 22 flexibly bends and deforms under a load.

Next, a method for manufacturing the first garnish 11, which is a composite resin molded product, will be described.
FIG. 5 is a view of the primary mold 30 for molding the primary molded body 21 and the secondary mold 31 for molding the secondary molded body 22 as viewed from below. 6 and 7 show a mold corresponding to the VI-VI cross section of FIG. 5 when the primary mold 30 is molded into the core mold 32 and the first resin material R1 is injected into the primary cavity 33. It is a figure which shows the cross section and the die cross section corresponding to the VII-VII cross section of FIG. 5, respectively. Further, FIG. 8 shows a gold corresponding to the VIII-VIII cross section of FIG. 5 when the secondary mold 31 is molded into the core mold 32 and the second resin material R2 is injected into the secondary cavity 34. It is a figure which shows the mold cross section.
A pair of core molds 32 having the same shape are provided on a rotary table (not shown), and the primary mold 30 and the secondary mold 31 are arranged above each core mold 32 so as to face each other. The core mold 32 is moved up and down by an elevating mechanism (not shown) to perform mold clamping and mold opening with respect to the opposing primary mold 30 and secondary mold 31. In the case of the present embodiment, in the core mold 32, a surface of the first garnish 11 (composite resin molded product) facing the rear of the vehicle is formed.

When actually manufacturing the first garnish 11 (composite resin molded product), after forming the primary molded body 21 with the core mold 32 and the primary mold 30, the core mold 32 is opened and the primary mold 32 is used. The rotary table is rotated 180 degrees with the molded body 21 remaining. As a result, the secondary mold 31 is positioned above the core mold 32 in which the primary molded body 21 remains. In this state, the core mold 32 is molded with respect to the secondary mold 31, and the secondary molded body 22 is formed by the core mold 32 (including the primary molded body 21) and the secondary mold 31. After that, the core mold 32 is opened, and the molded first garnish 11 (composite resin molded product) is taken out from the core mold 32. During this period, the core mold 32 is molded with respect to the primary mold 30, and the next primary molded body 21 is formed.

Here, as shown in FIGS. 5 and 6, the primary mold 30 is provided with a primary injection gate 35 for injecting the first resin material R1 into the primary cavity 33, and the secondary mold 31 is provided with a primary injection gate 35. As shown in FIGS. 5 and 8, a secondary injection gate 36 for injecting the second resin material R2 into the secondary cavity 34 is provided. The primary injection gate 35 is provided at a position communicating with the lower end surface of the bent wall portion 11c below the first garnish 11 (composite resin molded product). Further, the secondary injection gate 36 is provided at a position communicating with the upper end surface (upper surface of the bent piece 25) of the crossing portion 22b above the first garnish 11 (composite resin molded product).

When the core mold 32 is molded into the primary mold 30 and the first resin material R1 is injected from the primary injection gate 35 in that state, the first resin material R1 spreads in the primary cavity 33, and the primary molded body 21 is formed. At this time, an opening in which the main body portion 22a of the secondary molded body 22 is arranged later is formed in the central region of the primary molded body 21, and a communication groove 23 is formed on the front side of the upward extending wall 11f-2. NS.
One end side of the communication groove 23 extends to a position facing the groove straddling portion 24a of the flange portion 24. That is, an undercut portion is formed at a portion of the flange portion 24 facing the groove straddling portion 24a. Therefore, as shown in FIG. 7, the primary mold 30 of the present embodiment includes a mold main body 30A which is a main portion and a slide mold 30B for molding an adder cut portion.

After that, when the core mold 32 is molded into the secondary mold 31 and the second resin material R2 is injected from the secondary injection gate 36 in that state, the second resin material R2 becomes the primary molded body 21. It flows into the inner region of the primary molded body 21 through the communication groove 23, and the main body portion 22a of the secondary molded body 22 is formed. Further, the second resin material R2 solidified in the communication groove 23 forms the crossing portion 22b.
From the molded product taken out from the secondary mold 31, the molded portion by the primary injection gate 35 and the molded portion by the secondary injection gate 36 are cut off, respectively.

As described above, in the composite resin molded body (first garnish 11) of the present embodiment, the secondary injection gate 36 for molding the secondary molded body 22 is provided at the outer end of the communication groove 23 of the primary molded body 21. Can be set to. Therefore, the gate mark of the secondary injection gate 36 appears only at the outer end of the crossing portion 22b, which is difficult to see from the outside. Since the communication groove 23 does not completely divide the upward extending wall 11f-2 (side piece) of the primary molded body 21, it is possible to suppress a decrease in the rigidity of the primary molded body 21. In the case of the present embodiment, almost the entire area other than the thin end surface of the first garnish 11 is regarded as the product design surface.
Therefore, when the composite resin molded body (first garnish 11) of the present embodiment is adopted, a good appearance is obtained while suppressing a decrease in rigidity of the upward extending wall 11f-2 (side piece) of the primary molded body 21. You can get the quality. Further, since it is not necessary to make the wall thickness of the general part thicker, the degree of freedom in design can be improved and the space can be saved.

In particular, in the composite resin molded body (first garnish 11) of the present embodiment, the second resin material R2 for molding the secondary molded body 22 is softer than the first resin material R1 for molding the primary molded body 21. It is made of the resin material of. Therefore, after the primary molded body 21 is formed of the hard first resin material R1, the soft second resin material R2 is passed through the highly rigid communication groove 23 of the primary molded body 21 to the main body of the secondary molded body 22. The molded portion of 22a can be stably filled. Therefore, the product quality of the composite resin molded product is stable.

Further, the composite resin molded body (first garnish 11) of the present embodiment has a flange portion along the boundary portion of the primary molded body 21 in the vicinity of the boundary portion with the main body portion 22a of the secondary molded body 22. 24 are integrally formed. Therefore, the rigidity of the primary molded body 21 in the vicinity of the boundary portion of the secondary molded body 22 with the main body portion 22a can be increased by the flange portion 24.
Further, the flange portion 24 is stably held by the secondary mold 31 when the primary molded body is set in the secondary mold 31. Therefore, it is possible to prevent the primary molded body 21 from being displaced due to the injection pressure of the second resin material R2.
The ridges 26 formed on the primary molded body 21 suppress the misalignment of the primary molded body 21 with respect to the core mold 32.

Further, in the composite resin molded product (first garnish 11) of the present embodiment, the flange portion 24 is erected on the side walls facing each other of the communication groove 23 so as to straddle the communication groove 23. Therefore, when the secondary molded body 22 is molded, the communication groove 23 that serves as the flow path of the second resin material R2 can be reinforced by the flange portion 24. Therefore, when this configuration is adopted, it is possible to suppress the deformation of the communication groove 23 portion of the primary molded body 21 at the time of molding the secondary molded body 22, and to stabilize the product quality.

Further, in the composite resin molded body (first garnish 11) of the present embodiment, the plate-shaped main body portion 22a of the secondary molded body 22 formed of the soft second resin material R2 is in the load input direction from the outside. It extends along (vertical direction). Therefore, the impact due to the load input to the bonnet hood 6 from above can be effectively mitigated by the plate-shaped main body portion 22a of the secondary molded body 22.

Subsequently, other embodiments shown in FIGS. 9 and 10 will be described.
9 is a cross-sectional view corresponding to FIG. 7 of the above-described embodiment, and FIG. 10 is a cross-sectional view corresponding to FIG. 8 of the above-described embodiment.
The basic structure of the composite resin molded product of the other embodiment is almost the same as that of the above-described embodiment. Therefore, the same reference numerals are given to the parts common to the above-described embodiment, and duplicate description will be omitted.

In the composite resin molded product of the other embodiment, in the communication groove 23 formed in the primary molded body 121, in the region crossing the groove straddling portion 24a of the flange portion 24, the thickness direction of the upward extending wall 11f-2 It differs from the above configuration only in that a penetrating portion 50 is provided on the other side (the side opposite to the opening side of the communication groove 23). That is, in the case of the above embodiment, the bottom wall of the communication groove 23 is provided in the region of the communication groove 23 that crosses the groove straddling portion 24a of the flange portion 24, but in other embodiments, the bottom wall thereof is provided. The wall is removed by the penetration 50.

In the case of the composite resin molded product of the other embodiment, the undercut portion is not formed in the region of the flange portion 24 that crosses the groove straddling portion 24a due to the above configuration. Therefore, the primary molded body can be molded without using the slide mold as in the above embodiment. However, the core mold 32 is formed with a convex portion 51 for forming the penetrating portion 50 in the primary molded body 121. Further, in the above embodiment, the primary molded body 21 and the secondary molded body 22 are molded using the common core mold 32, but in other embodiments, the core mold 32 and the primary mold 30 are used for the primary molding. After forming the molded body 121, the secondary molded body 22 is formed by another core mold 132 having no convex portion 51 and the secondary mold 31.
Therefore, when the composite resin molded product of another embodiment is adopted, the structure of the primary mold 30 can be simplified.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist thereof. For example, the composite resin molded product is not limited to the first garnish 11 of the cowl top garnish 10, and may be another resin molded product mounted on a vehicle or the like. Further, in the above embodiment, a mold that is opened vertically is used, but the mold may be one that is opened left and right.

11 ... 1st garnish (composite resin molded product)
11f-1 ... Inclined wall 11f-2 ... Upper extending wall (side piece)
21,121 ... Primary molded body 22 ... Secondary molded body 22a ... Main body part 22b ... Crossing part 23 ... Communication groove 24 ... Flange part 24a ... Groove straddling part 50 ... Penetration part R1 ... First resin material R2 ... Second Resin material

Claims (5)

A plate-shaped primary molded body made of a first resin material and a plate-shaped secondary molded body made of a second resin material are integrated.
In a composite resin molded product in which both the primary molded product and the secondary molded product constitute a product design surface,
The primary molded body has a side piece adjacent to the main body portion of the secondary molded body.
The side piece has a communication groove on one side in the plate thickness direction that communicates one side portion adjacent to the main body portion of the secondary molded body and the other side portion on the opposite side of the one side portion.
The secondary molded body has a main body portion and a crossing portion in which one end is connected to the main body portion and the other end faces the outside of the other side portion of the side piece. and,
The primary molded product is a composite resin molded product having a flange portion along the boundary portion in the vicinity of the boundary portion with the main body portion of the secondary molded body. The composite resin molded product according to claim 1 , wherein the flange portion is connected to the side walls facing each other of the communication groove so as to straddle the communication groove. Among the communicating groove, in the region crossing the groove straddling portion of the flange portion, of claim 2, wherein a through portion communicating with the other side in the thickness direction of the side pieces is formed Composite resin molded product. The composite resin molded product according to any one of claims 1 to 3 , wherein the second resin material is formed of a resin material that is softer than the first resin material. The composite resin molded product according to claim 4 , wherein the plate-shaped main body of the secondary molded product extends along the load input direction from the outside.

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