JP6959709B2 - Resin panel parts and their manufacturing methods - Google Patents

Description

The present invention relates to resin panel parts and a method for manufacturing the same.

Resin panel parts such as automobile instrument panels have been devised in various ways to enhance their appearance. For example, Patent Document 1 below shows a configuration in which a linear decorative member is provided on the design surface of an instrument panel. This decorative member is formed separately from the panel body of the instrument panel and then attached to the panel body.

Japanese Unexamined Patent Publication No. 2016-210314

However, in the above case, since a step of forming the panel main body and the decorative member and a step of attaching the decorative member to the panel main body are required, the number of man-hours increases and the manufacturing cost increases. In particular, when an extra-fine decorative member is provided, if the panel body and the decorative member are formed as separate parts as described above, the work of forming the decorative member itself and accurately attaching the decorative member to the panel body is extremely difficult. The manufacturing cost is even higher because of the difficulty.

The above-mentioned problems are not limited to the instrument panel, and may occur similarly when the decorative line is provided on the design surface of the resin panel component.

Therefore, an object of the present invention is to facilitate the production of a resin panel having a decorative wire and reduce the production cost.

In order to solve the above problems, the present invention includes a panel main body having a design surface and a decorative member having a decorative line extending continuously along the design surface, and the panel main body is a primary molded body. Provided is a resin panel component made of a multicolor molded product in which the decorative member is a secondary molded body.

Further, in order to solve the above problems, the present invention provides a method for manufacturing a resin panel component including a panel main body having a design surface and a decorative member having a decorative line extending continuously along the design surface. The step of molding the panel body by molding one mold and the other mold to form a first cavity and injecting resin into the first cavity, and the one mold. A second cavity is formed by separating the slide mold provided on the mold from the other mold, and a resin different from the resin of the panel body is injected into the second cavity to form the decorative member. Provided is a method for manufacturing a resin panel part having a step of molding.

As described above, by integrally forming the panel main body and the decorative member by multicolor molding, the work of forming them separately and the work of attaching the decorative member to the panel main body become unnecessary. As a result, the man-hours for manufacturing the resin panel part having the decorative wire can be reduced, and the manufacturing cost can be reduced.

When the panel body and the decorative member are multicolored as described above, if the decorative member is first formed as a primary molded body, the resin of the panel body ejected later comes into contact with the decorative member. The decorative member may be deformed or melted. In particular, when the decorative member is extremely fine, there is a high possibility that such a problem will occur. Therefore, in the present invention, by using the panel main body as the primary molded body and the decorative member as the secondary molded body as described above, injection is performed to mold the panel main body even when the decorative member is extremely fine. It is possible to avoid deformation and melting of the decorative member due to the resin.

In the above resin panel parts, it is preferable that the decorative member includes a fixed portion fixed to the back surface of the panel main body and a main body portion having a decorative line. By fixing the fixing portion provided on the decorative member to the back surface of the panel body in this way, regardless of the shape of the decorative line (for example, even if the decorative line is extremely fine), the panel body and the decorative member Since a fixed area with and can be secured, both can be firmly fixed.

In the above resin panel parts, when the wall thickness of the main body of the decorative member in the thickness direction of the resin panel parts (direction orthogonal to the design surface; hereinafter referred to as "panel thickness direction") is large, the main body The amount of molding shrinkage in the panel thickness direction of the portion and its variation become large. If the amount of molding shrinkage of the main body increases in the extending direction of the decorative wire, the decorative wire undulates in the longitudinal direction and looks bad. Therefore, if a groove extending in the extending direction of the decorative line is formed on the back surface of the main body, the wall thickness of the main body of the decorative member in the panel thickness direction is reduced, and the molding shrinkage of the main body is suppressed. , It is possible to prevent the appearance of the decorative line from deteriorating.

The resin panel component described above has, for example, a structure in which the panel main body has a slit extending in the extending direction of the decorative line, and the decorative member has a substantially flat plate shape that covers the slit of the panel main body from the back surface side. be able to. In this case, of the decorative members, the portion exposed from the slit of the panel body to the design surface side becomes the decorative line. By forming the decorative member into a substantially flat plate shape in this way, the shape of the second cavity for molding the decorative member also becomes a simple shape having a substantially flat plate shape, so that the resin can be reliably filled in the second cavity. As a result, the molding accuracy of the decorative member is improved.

As described above, by forming the resin panel parts having the decorative lines by multicolor molding, the production of the resin panel parts is facilitated, so that the manufacturing cost can be reduced.

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. (A) to (C) are cross-sectional views showing a procedure for forming a panel body and a decorative member of a resin panel component according to another embodiment by two-color molding. It is sectional drawing of the resin panel part which concerns on still another Embodiment. (A) and (B) are cross-sectional views showing a procedure for forming a panel body and a decorative member of the resin panel component shown in FIG. 5 by two-color molding.

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 having a design surface 10a and a decoration member 20 having a decoration line 20a continuously extending along the design surface 10a. 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 in addition to those having different base resins, 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, it 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.

Hereinafter, the configuration of the decorative member 20 will be described with reference to FIG. 2. However, in the description of the decorative member 20, the extending direction of the decorative line 20a {the left-right direction of FIG. 2 (B)} is set to "longitudinal direction" for convenience. "Direction", the direction orthogonal to the design surface 10a of the panel body 10 (vertical direction in FIG. 2) is the "panel thickness direction", and the direction orthogonal to both the longitudinal direction and the panel thickness direction {left and right in FIG. 2 (A). Direction} is called "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 provided with 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 outward in the width direction from the end portion on the back side in the panel thickness direction of the main body portion 22. ing. 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.

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 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 (vertical direction in the drawing).

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 movable main body 31 of the movable mold 30 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, which is provided on the outer side of the second molding surface 32b in the width direction and 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 panel body 10 is molded by injecting resin into the first cavity 51.

After the resin of the panel body 10 has solidified, the slide mold 32 is separated from the fixed mold 40 as shown in FIG. 3B in a state where the movable main body 31 and the fixed mold 40 are in contact with each other (in the figure). Retreat to (down). 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. By injecting a resin different from the resin of the panel main body 10 into the second cavity 52, the decorative member 20 is molded, and the decorative member 20 and the panel main body 10 are integrated.

In this way, the process of separately forming the decorative member 20 and the panel body 10 by forming the resin panel component (instrument panel 1) having the decorative wire 20a by two-color molding, and the decorative member 20 Is not required to be attached to the panel body 10, so that the production is facilitated. Further, the width of the decorative line 20a can be freely set by changing the shape of the mold (specifically, the width direction dimension of the first molding surface 40a of the fixed mold 40). Therefore, even an extra-fine (for example, 7 mm or less, particularly 5 mm or less) decorative wire 20a, which was difficult when the decorative member is provided as a separate part as in the conventional case, can be easily formed. For convenience of manufacture, the width of the decorative line 20a is preferably 1 mm or more when it is provided on a flat surface and 2 mm or more when it is provided on a curved surface.

Further, as described above, after the panel body 10 is first molded as the primary molded body, the decorative member 20 is integrally molded with the panel body 10 as the secondary molded body to form the panel body 10. Since the molten resin can prevent the decorative member 20 having a small volume from being deformed and melted, the dimensional accuracy of the decorative wire 20a provided on the decorative member 20 is improved.

Further, in the present embodiment, since the groove 23 extending in the longitudinal direction is provided on the back surface of the main body portion 22 of the decorative member 20, the wall thickness of the main body portion 22 in the panel thickness direction is reduced by that amount. Has been done. As a result, the molding shrinkage of the main body portion 22 of the decorative member 20 is suppressed, so that the dimensional accuracy of the main body portion 22 is improved, the situation where the decorative line 20a undulates in the longitudinal direction can be prevented, and the aesthetic appearance can be improved. ..

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 embodiment shown in FIG. 4, the shape of the second molding surface 32b of the slide type 32 is different from that of the above embodiment. Specifically, the second molding surface 32b of the slide mold 32 and the inner surface of the slit 11 of the panel body 10 molded on this surface are parallel to the slide direction (panel thickness direction) of the slide mold 32. ..

In this embodiment, first, as shown in FIG. 4A, the movable mold 30 and the fixed mold 40 are molded, and the first molding surface 32a of the slide mold 32 is fitted into the first molding surface 40a of the fixed mold 40. The first cavity 51 is formed by the combination, and the resin is injected into the first cavity 51 to form the panel body 10. Then, when the resin of the panel body 10 is solidified, as shown in FIG. 4 (B), the slide mold 32 is slid to the side (lower in the figure) away from the fixed mold 40. At this time, since the second molding surface 32b of the slide mold 32 and the inner surface of the slit 11 of the panel body 10 are parallel to the slide direction, they slide. The sliding portion P between the slide mold 32 and the panel main body 10 divides the space 52a for molding the fixing portion 21 of the decorative member 20 and the space 52b for molding the main body portion 22 of the decorative member 20. , The second cavity is not formed. After that, by further sliding the slide mold 32, as shown in FIG. 4C, the second molding surface 32b of the slide mold 32 is separated from the inner surface of the slit 11 of the panel body 10, and the decorative member 20 is fixed. The space 52a for molding the portion 21 and the space 52b for molding the main body 22 communicate with each other to form the second cavity 52. By injecting resin into the second cavity 52, the decorative member 20 is molded.

As described above, in the embodiment shown in FIG. 4, since it is necessary to slide the slide mold 32 greatly in order to form the second cavity 52, the wall thickness of the decorative member 20 in the panel thickness direction becomes large. The amount of molding shrinkage increases. In particular, the dimensional accuracy of the decorative line 20a deteriorates due to the increase in the wall thickness T2 {see FIG. 4 (C)} of the main body 22 of the decorative member 20 in the panel thickness direction and the increase in the amount of molding shrinkage. , The appearance may deteriorate.

On the other hand, in the embodiment shown in FIG. 3, the second molding surface 32b of the slide mold 32 and the end surface (inner surface of the slit 11) of the panel body 10 molded on this surface are in the slide direction (panel thickness) of the slide mold 32. Since it is inclined with respect to the vertical direction), these surfaces are separated from each other just by sliding the slide mold 32 a little, and the space for forming the main body 22 of the decorative member 20 and the fixing portion 21 of the decorative member 20 are formed. The second cavity 52 is formed by communicating with the space for forming the second cavity 52. In this case, since the slide amount of the slide type 32 can be smaller than that of the embodiment shown in FIG. 4, the wall thickness of the decorative member 20 in the panel thickness direction, particularly the wall thickness of the main body 22 in the panel thickness direction. T1 {see FIG. 3B} can be suppressed, the amount of molding shrinkage of the main body 22 can be suppressed, and the dimensional accuracy of the decorative line 20a can be improved.

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.

The instrument panel 1 is molded using the mold shown in FIG. The fixed mold 40 has a flat first forming surface 40a for forming the decorative wire 20a, a second forming surface 40b for forming the design surface 10a of the panel body 10, and a second forming surface for forming the inner surface of the slit 11 of the panel body 10. It has 3 molding surfaces 40c. The movable main body 31 and the slide mold 32 have flat molding surfaces 31a and 32d, respectively. The first molding surface 40a of the fixed mold 40 and the molding surface 32d of the slide mold 32 facing the first molding surface 40a in the panel thickness direction may be provided with irregularities that fit each other.

First, as shown in FIG. 6A, the first molding surface 40a of the fixed mold 40 is brought into contact with the molding surface 32d of the slide mold 32 in a state where the movable mold 30 and the fixed mold 40 are molded. As a result, the first cavity 51 is formed by the second molding surface 40b and the third molding surface 40c of the fixed mold 40, the molding surface 31a of the movable mold main body 31, and the molding surface 32a of the slide mold 32. The panel body 10 is molded by injecting resin into the first cavity 51.

Next, as shown in FIG. 6B, the slide mold 32 is slid to separate 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 back surface 10b of the panel body 10, and the molding surface 32d of the slide mold 32. By injecting resin into the second cavity 52, a substantially flat plate-shaped decorative member 20 is formed.

Since the decorative member 20, that is, the second cavity 52 has a substantially flat plate shape as in the present embodiment, the resin can be easily filled in the second cavity 52, so that the moldability of the decorative member 20 and the decoration can be achieved. The dimensional accuracy of the wire 20a is improved. In particular, when the width of the decorative wire 20a is extremely narrow, the decorative wire 20a can be accurately formed by simplifying the shape of the decorative member 20 as in the present embodiment.

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 present invention is not limited to the instrument panel, and can be applied to any resin panel component having a decorative line on the design surface regardless of the application or shape.

1 Instrument panel (resin panel parts)
10 Panel body 10a Design surface 11 Slit 20 Decorative member 20a Decorative line 21 Fixed part 22 Main body 23 Groove 30 Movable type 32 Slide type 40 Fixed type

Claims (3)

Panel body with design surface and slits,
It has a decorative line that extends continuously along the design surface, and includes a decorative member that has entered the inner circumference of the slit of the panel body.
It is composed of a multicolor molded product in which the panel body is a primary molded body and the decorative member is a secondary molded body.
A resin panel component in which the inner surface of the slit of the panel body and the side surfaces of the decorative member in close contact with the surface on both sides in the width direction are inclined toward the center side in the width direction of the slit as it goes to the front side in the panel thickness direction. The resin panel component according to claim 1, wherein the decorative member includes a fixing portion fixed to the back surface of the panel main body and a main body portion having the decorative wire. Panel body with design surface and slits,
A method for manufacturing a resin panel component, which has a decorative line extending continuously along the design surface and includes a decorative member that has entered the inner circumference of a slit of the panel body.
A step of molding the panel body by molding one mold and the other mold to form a first cavity and injecting resin into the first cavity.
A second cavity is formed by separating the slide mold provided on the one mold from the other mold, and a resin different from the resin of the panel body is injected into the second cavity. It has a step of molding the decorative member.
A method for manufacturing a resin panel component in which the inner surface of the slit of the panel body and the slide-type molding surface for molding the surface are inclined toward the center side in the width direction of the slit as the molding surface of the slide type is inclined toward the front side in the panel thickness direction.

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