JP6929000B2 - Resin panel parts and their manufacturing methods - Google Patents

Description

The present invention relates to a resin panel part, and more particularly to a resin panel part formed by a multicolor molding method in which a primary molded body and a secondary molded body are molded in the same mold.

In Patent Document 1 below, an automobile interior product (for example, an instrument) formed by a so-called multicolor molding method in which a primary molded body and a secondary molded body made of different types of resins are integrally injection-molded in the same mold. The ment panel) is shown. Specifically, first, as shown in FIG. 6, the upper mold 120 and the lower mold 130 are molded, and the slide mold 140 is brought into contact with the upper mold 120 to form the first cavity 150. Resin is injected into the first cavity 150 to form the primary molded body 102. After that, as shown in FIG. 7, the slide mold 140 is separated from the upper mold 120 to form the second cavity 160, and the resin is injected into the second cavity 160 to form the secondary molded body 103. As described above, the resin panel component 101 having the primary molded body 102 and the secondary molded body 103 integrally is formed.

In the invention described in the same document, the end portion of the primary molded body 102 formed in the first cavity 150 is cured at an early stage by forming the end portion of the first cavity 150 into a tapered shape. As a result, when the resin is injected into the second cavity 160 shown in FIG. 7, the situation in which the resin enters between the design surface 102a of the primary molded body 102 and the upper mold 120 is avoided, and the design of the primary molded body 102 is prevented. It prevents the parting line 104 between the surface 102a and the design surface 103a of the secondary molded body 103 from being obscured.

Japanese Unexamined Patent Publication No. 2015-9449

As described above, Patent Document 1 discloses a technique for preventing obscuring the parting line 104 on the design surface of the resin panel component 101 by reducing the wall thickness of the end portion of the primary molded body 102. There is. However, on the back surface of the resin panel component 101 (the surface opposite to the design surface), even if some resin leakage occurs, it does not affect the appearance, so it was considered that there is no particular problem.

However, according to the verification by the present inventors, when the resin panel parts are formed by multicolor molding, not only the resin leakage near the boundary (parting line) on the design surface side between the primary molded body and the secondary molded body, but also the back surface. It has become clear that resin leakage near the side boundary is also a problem. That is, as shown in FIG. 7, when the resin is injected into the second cavity 160, if the primary molded body 102 is not completely solidified, the molten resin P (between the back surface of the primary molded body 102 and the lower mold 130 ( (Indicated by scattered points in FIG. 7) enters, and the injection pressure is applied to the molten resin P, so that the primary molded body 102 is pushed toward the design surface side (upper part in the drawing). As a result, a raised portion Q (shown by a dotted line in FIG. 7) may be formed on the design surface 102a of the primary molded body 102 of the resin panel component 101 taken out from the mold.

From the above circumstances, it is an object of the present invention to prevent deformation of the design surface of the primary molded product in the resin panel parts formed by multicolor molding.

In order to solve the above problems, the present invention is fixed to a primary molded body having a design surface, a main body portion provided with a design surface adjacent to the design surface of the primary molded body, and the back surface of the primary molded body. A resin panel part comprising a secondary molded body having a fixed portion, and the primary molded body and the secondary molded body are integrally formed by multicolor molding. Among the primary molded bodies, the primary molded body is described. Provided is a panel component in which the wall thickness at the boundary between the back surface of the molded body and the back surface of the secondary molded body is thinner than the wall thickness in the region separated from the secondary molded body than the boundary.

In this way, among the primary molded bodies, by reducing the wall thickness at the boundary between the back surface of the primary molded body and the back surface of the secondary molded body, the primary molded body is injection-molded and then the vicinity of the boundary is cured at an early stage. Can be made to. As a result, when the molten resin is injected into the second cavity for molding the secondary molded body, deformation of the primary molded body near the boundary due to the injection pressure of the molten resin is suppressed, so that the back surface of the primary molded body and the mold are suppressed. It is possible to prevent the molten resin from entering between and.

From this, the present invention has a primary molded body having a design surface, a main body portion provided with a design surface adjacent to the design surface of the primary molded body, and a fixing portion fixed to the back surface of the primary molded body. It is a method of manufacturing a resin panel part including a secondary molded body having A step of molding the primary molded body by molding a mold to form a first cavity and injecting a resin into the first cavity, and sliding the slide mold with respect to the mold main body to obtain the above. It has a step of forming a second cavity by separating it from the other mold, and injecting a resin different from the resin of the panel body into the second cavity to form the secondary molded body. In the first cavity, the panel thickness direction dimension at the boundary between the molding surface of the slide mold and the molding surface of the mold body is the panel thickness direction dimension in the region separated from the slide mold from the boundary. It is also characterized as a method for manufacturing smaller resin panel parts.

As described above, according to the present invention, when the resin panel component is formed by multicolor molding, the resin leakage on the back surface of the resin panel component can be prevented, so that the deformation of the design surface of the primary molded body due to this can be prevented. can.

It is a perspective view of a resin panel component (instrument panel). (A) is a cross-sectional view taken along the line XX of FIG. 1, and (B) is a cross-sectional view taken along the line YY of FIG. (A) and (B) are cross-sectional views showing a procedure for forming a panel body and a decorative member of a resin panel component by two-color molding. It is sectional drawing of the resin panel part which concerns on other embodiment. It is sectional drawing of the resin panel part which concerns on still another Embodiment. It is sectional drawing which shows the state of forming the conventional resin panel part by two-color molding, and shows the process of forming a primary molded body. It is sectional drawing which shows the state of forming the conventional resin panel part by two-color molding, and shows the process of molding a secondary molded body.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an automobile instrument panel 1 as a resin panel component according to the present embodiment. The instrument panel 1 integrally includes a panel body 10 and a decorative member 20. The panel main body 10 has a design surface 10a, and the decorative member 20 has a linear design surface (decorative line 20a) extending continuously along the design surface 10a of the panel main body 10. In the illustrated example, the decorative line 20a extends substantially linearly along the vehicle width direction. The panel body 10 and the decorative member 20 are made of different resins. The "different resins" are resins having different appearances such as color, luster, and texture, and have different base resins, and even if the base resins are the same, the types and compounding ratios of the materials to be added are different. Including those with different colors.

The panel body 10 includes a front portion 12 having through holes, recesses, and the like for attaching an instrument, audio, and the like, and a smooth upper surface portion 13 having no through holes. In the illustrated example, a decoration member 20 having a decoration line 20a extending in the vehicle width direction is provided near the upper end of the front portion 12. Place where the decorative line 20a is provided Not limited to this, for example, the decorative line 20a may be provided at the upper surface portion 13 or at the boundary between the front surface portion 12 and the upper surface portion 13. In the following, for convenience of explanation, the extending direction of the decorative line 20a {the left-right direction of FIG. 2B} is the "longitudinal direction", and the direction orthogonal to the design surface 10a of the panel body 10 (the vertical direction of FIG. 2). ) Is referred to as the "panel thickness direction", and the direction orthogonal to both the longitudinal direction and the panel thickness direction {the left-right direction of FIG. 2 (A)} is referred to as the "width direction". Further, in the panel thickness direction, the vehicle interior space side (design surface 10a side) is referred to as "front side", and the opposite side is referred to as "back side".

As shown in FIG. 2A, the decorative member 20 has a fixing portion 21 fixed to the back surface 10b of the panel main body 10 and a main body portion 22 having a decorative line 20a. In the illustrated example, fixing portions 21 are provided on both sides of the main body portion 22 in the width direction. Specifically, the main body portion 22 has a curved surface shape that is convex on the front side, and the flat plate-shaped fixing portion 21 extends from the end portion on the back side in the panel thickness direction of the main body portion 22 toward the outside in the width direction. There is. By fixing the fixing portion 21 provided on the decorative member 20 to the panel body 10 in this way, the fixed area between the decorative member 20 and the panel body 10 is fixed regardless of the shape and size of the decorative line 20a. Can be secured, so that both can be firmly fixed.

The panel body 10 has a main portion 10c that constitutes most of the design surface 10a, and a thin portion 10d provided in the vicinity of the decorative line 20a. In the illustrated example, the thin portion 10d is continuously provided on the decorative line 20a side (inside in the width direction) of the main portion 10c. The main portion 10c has a plate shape having a substantially uniform wall thickness in the panel thickness direction. The thin portion 10d is thinner in the panel thickness direction than the main portion 10c. Specifically, the wall thickness T1 of the panel main body 10 at the boundary B1 on the front surface side (design surface side) of the panel main body 10 and the decorative member 20, and the back surface side (design) of the panel main body 10 and the decorative member 20. The wall thickness T2 of the panel body 10 at the boundary B2 on the side opposite to the surface) is thinner than the wall thickness T3 of the main portion 10c. In the illustrated example, the wall thickness of the thin portion 10d of the panel body 10 in the panel thickness direction gradually becomes thinner toward the decorative line 20a side (inside in the width direction) (T1 <T2 <T3). The main portion 10c may be provided with protrusions, recesses, etc. for the purpose of reinforcement or attachment to other members, but the wall thickness T3 of the main portion 10c excludes such protrusions, recesses, etc. It shall refer to the wall thickness in the region where the thickness is uniform.

In the present embodiment, the panel main body 10 is provided with a slit 11 extending in the longitudinal direction, and the main body portion 22 of the decorative member 20 is inserted into the inner circumference of the slit 11. The inner surface of the slit 11 of the panel main body 10 and the side surfaces of the main body portion 22 of the decorative member 20 on both sides in the width direction are in close contact with each other. The line 20a is inclined toward the center side in the width direction (the side approaching each other). Of the front surface of the main body 22 of the decorative member 20, the region exposed from the slit 11 is the decorative line 20a. The decorative line 20a in the illustrated example is formed of a curved surface having a convex shape on the front side, and the design surfaces 10a are adjacent to each other on both sides in the width direction without a gap. In the present embodiment, as shown in FIG. 2B, the decorative line 20a extends continuously in a substantially straight line along the longitudinal direction (vehicle width direction). The top portion (front end) of the decorative line 20a projects to the front side from the design surface 10a adjacent to both sides in the width direction over the entire length direction.

The front surface and the back surface of the decorative member 20 have the same shape. Specifically, the front surface and the back surface of the main body 22 are formed of curved surfaces having the same shape. As a result, a groove 23 extending in the longitudinal direction is provided on the back surface of the main body 22. The front side surface and the back side surface of the fixing portion 21 are composed of flat surfaces orthogonal to the panel thickness direction.

The instrument panel 1 is formed by multicolor molding (two-color molding) in which the panel body 10 is a primary molded body and the decorative member 20 is a secondary molded body. Hereinafter, a method for manufacturing the above instrument panel 1 will be described.

The instrument panel 1 is formed by using the mold shown in FIG. This mold includes a movable mold 30 and a fixed mold 40. The movable type 30 includes a movable type main body 31 and a slide type 32. The slide type 32 is slidable with respect to the movable main body 31, and in the illustrated example, the slide type 32 is slidable in the panel thickness direction.

The fixed mold 40 is provided with a concave curved first forming surface 40a extending in the longitudinal direction and a second forming surface 40b that surrounds the entire circumference of the first forming surface 40a and forms the design surface 10a of the panel body 10. Be done. The second molded surface 40b has a substantially flat portion 40b1 for forming the design surface of the main portion 10c of the panel main body 10 and an inclined portion 40b2 for forming the design surface of the thin portion 10d of the panel main body 10. The movable main body 31 has a molding surface 31a that surrounds the entire circumference of the slide mold 32 and forms the back surface 10b of the panel main body 10. The slide mold 32 is provided with a convex curved first forming surface 32a extending in the longitudinal direction and both sides of the first forming surface 32a in the width direction to form the inner surface of the slit 11 of the panel body 10. And a third molding surface 32c that is provided on the outer side of the second molding surface 32b in the width direction and that forms the back surface 10b of the panel body 10. In the illustrated example, the pair of second forming surfaces 32b of the slide type 32 are inclined inward in the width direction toward the front side (upper side in the drawing) in the panel thickness direction, and are smoothly continuous with the first forming surface 32a.

First, as shown in FIG. 3A, the movable mold 30 and the fixed mold 40 are molded. Specifically, the movable main body 31 is brought into contact with the fixed mold 40, and the first molding surface 32a of the slide mold 32 is fitted to the first molding surface 40a of the fixed mold 40. As a result, the first cavity 51 is formed by the second molding surface 40b of the fixed mold 40, the molding surface 31a of the movable main body 31, and the second molding surface 32b and the third molding surface 32c of the slide mold 32. .. The first cavity 51 has a main region 51a for forming the main portion 10c of the panel main body 10 and a thin-walled region 51b for forming the thin-walled portion 10d of the panel main body 10. The main region 51a of the first cavity 51 is provided between the substantially flat portion 40b1 of the second molding surface 40b of the fixed mold 40 and the molding surface 31b of the movable main body 31. The thin-walled region 51b of the first cavity 51 is provided between the inclined portion 40b2 of the second molding surface 40b of the fixed mold 40, the molding surface 31b of the movable main body 31, and the third molding surface 32c of the slide mold 32. The panel body 10 is formed by injecting the resin into the first cavity 51 and solidifying the resin. At this time, the resin in the thin-walled region 51b of the first cavity 51 (thin-walled portion 10d of the panel main body 10) solidifies earlier than the resin in the main region 51a (main portion 10c of the panel main body 10).

After that, with the movable main body 31 and the fixed mold 40 in contact with each other, as shown in FIG. 3 (B), the slide mold 32 is retracted to the side (lower in the figure) away from the fixed mold 40. As a result, the second cavity 52 is formed by the first molding surface 40a of the fixed mold 40, the inner and back surfaces 10b of the slit 11 of the panel body 10, and the first to third molding surfaces 32a to 32c of the slide mold 32. NS. The decorative member 20 is formed by injecting a resin different from the resin of the panel body 10 into the second cavity 52.

At this time, the injection pressure of the molten resin injected into the second cavity 52 is applied to the previously molded panel main body 10, but the thin-walled portion 10d provided in the panel main body 10 solidifies at an early stage, so that the thin-walled portion 10d Since the deformation of the resin is suppressed, it is possible to prevent the molten resin from entering between the panel body 10 and the mold.

Specifically, in the present embodiment, in the state shown in FIG. 3A, the panel thickness direction dimension T1'at the boundary B1'between the slide type 32 and the fixed type 40 of the first cavity 51 is the first. Since it is smaller than the panel thickness direction dimension T3'in the main region 51a of the cavity 51, the resin near the inner end in the width direction (boundary B1') of the first cavity 51 cures earlier than the resin in the main region 51a. .. As a result, the inner end in the width direction (end on the slit 11 side) of the thin portion 10d of the panel body 10 formed in the first cavity 51 is completely solidified and deformed by the pressure of the resin injected into the second cavity 52. This resin can be prevented from entering between the design surface of the thin portion 10d of the panel body 10 and the inclined portion 40b2 of the second molding surface 40b of the fixed mold 40. As a result, it is possible to prevent the resin of the decorative member 20 from leaking to the design surface 10a of the panel body 10 and the boundary (parting line) between them becoming unclear.

Further, in the present embodiment, in the state shown in FIG. 3A, the panel thickness direction dimension T2'at the boundary B2'between the slide type 32 and the movable type main body 31 of the first cavity 51 is the boundary B2'. Since it is smaller than the panel thickness direction dimension T3'in the region separated from the slide mold 32 (main region 51a of the first cavity 51), the resin near the boundary B2'of the first cavity is cured at an early stage. As a result, the intermediate portion in the width direction of the thin portion 10d of the panel body 10 formed in the first cavity 51 (near the boundary B2 on the back surface side between the panel body 10 and the decorative member 20) is completely solidified, and the second cavity is completely solidified. Since it is difficult to be deformed by the pressure of the resin injected into 52, it is possible to prevent this resin from entering between the back surface of the thin portion 10d of the panel main body 10 and the molding surface 31a of the movable main body 31. As a result, the situation where the panel body 10 is pressed against the fixed mold 40 side by the pressure of the molten resin (see the P part in FIG. 7) that has entered between the panel body 10 and the movable body 31 is avoided, and the panel body 10 Deformation of the design surface 10a can be prevented.

The present invention is not limited to the above embodiments. Hereinafter, other embodiments of the present invention will be described, but the same points as those of the above-described embodiments will be omitted.

In the above embodiment, the case where the wall thickness of the thin portion 10d of the panel main body 10 gradually becomes thinner toward the decorative line 20a is shown, but the present invention is not limited to this. For example, as shown in FIG. 4, the wall thickness of the thin portion 10d of the panel body 10 may be made uniform. In this case, the wall thickness T1 of the panel main body 10 at the boundary B1 on the front surface side (design surface side) between the panel main body 10 and the decorative member 20 and the back surface side (opposite to the design surface side) of the panel main body 10 and the decorative member 20. The wall thickness T2 of the panel body 10 at the boundary B2 on the side) is equal to that of the wall thickness T3 of the main portion 10c.

The embodiment shown in FIG. 5 is different from the above embodiment in that the decorative member 20 has a substantially flat plate shape. Of the decorative member 20, the portion fixed to the back surface 10b of the panel main body 10 is the fixing portion 21, and the region covering the slit 11 of the panel main body 10 from the back side is the main body portion 22. In the illustrated example, fixing portions 21 are provided on both sides of the main body portion 22 in the width direction, and the front surface of the main body portion 22 is exposed from the slit 11 to form the decorative line 20a. By forming the decorative member 20 into a substantially flat plate shape in this way, the second cavity for molding the decorative member 20 also has a substantially flat plate shape, so that the second cavity can be easily filled with resin, and the decorative member 20 can be easily filled. The moldability of the decorative wire 20a and the dimensional accuracy of the decorative wire 20a are improved.

Further, in the above embodiment, the entire circumference of the decorative line 20a is surrounded by the design surface 10a, but the decorative line 20a may be provided at the end of the panel main body 10, for example, of the panel main body 10. , The decorative line 20a may be provided along the edge of the through hole for attaching audio or the like. Further, the design surface of the secondary molded body is not limited to the decorative line 20a, and may have an arbitrary shape such as a rectangle.

Further, the present invention is not limited to the instrument panel, and is applicable regardless of the application or shape as long as the primary molded body and the secondary molded body having a design surface are integrally formed by multicolor molding. It is possible.

1 Instrument panel 10 Panel body (primary molded body)
10a Design surface 10b Back surface 10c Main part 10d Thin wall part 20 Decorative member (secondary molded body)
20a Decorative line (design side)
21 Fixed part 22 Main body part 30 Movable type 31 Movable type main body 32 Slide type 40 Fixed type 51 First cavity 51a Main area 51b Thin-walled area 52 Second cavity

Claims (2)

A primary molded body having a design surface, a main body portion provided with a design surface adjacent to the design surface of the primary molded body, and a secondary molded body having a fixed portion fixed to the back surface of the primary molded body. A resin panel component in which the primary molded body and the secondary molded body are integrally formed by multicolor molding.
The primary molded body has a thin-walled portion provided at an end portion on the secondary molded body side, and a main portion adjacent to the thin-walled portion and thicker than the thin-walled portion.
A resin panel component in which a fixed portion of the secondary molded body is fixed to the back surface of a thin-walled portion of the primary molded body and is separated from the main portion. A primary molded body having a design surface, a main body portion provided with a design surface adjacent to the design surface of the primary molded body, and a secondary molded body having a fixed portion fixed to the back surface of the primary molded body. Manufacture of a resin panel part in which the primary molded body has a thin-walled portion provided at an end portion on the secondary molded body side and a main portion adjacent to the thin-walled portion and thicker than the thin-walled portion. It ’s a method,
One mold having a mold body and a slide mold and the other mold that can approach and separate from the one mold are molded to form a first cavity, and a resin is formed in the first cavity. And the process of molding the primary molded body by injecting
A second cavity is formed by sliding the slide mold with respect to the mold body and separating it from the other mold, and a resin different from the resin of the primary molded product is injected into the second cavity. This includes a step of molding the secondary molded body.
A method for manufacturing a resin panel component in which the second cavity is in contact with the back surface of a thin-walled portion of the primary molded body and is separated from the main portion.

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