WO2017158644A1

WO2017158644A1 - Vehicular resin molded article and method for manufacturing vehicular resin molded article

Info

Publication number: WO2017158644A1
Application number: PCT/JP2016/001533
Authority: WO
Inventors: 裕行庄司; 勇一石塚
Original assignee: 河西工業株式会社
Priority date: 2016-03-17
Filing date: 2016-03-17
Publication date: 2017-09-21
Also published as: JPWO2017158644A1; JP6539406B2

Abstract

Provided are a vehicular resin molded article and a manufacturing method therefor such that short shots are effectively suppressed. A trim (1), which is the vehicular resin molded article, has clip seats (10) for mounting and holding clips (4) to be fitted to a vehicle body (5), the clip seats (10) being molded integrally with a base material body (3). Each of the clip seats (10) comprises: a pedestal (11) having a planar shape to which the clip (4) is mounted; a peripheral wall (12) having a vertical wall shape which rises from the base material body (3) and is connected to the peripheral edge of the pedestal (11); and a second reinforcing rib (14) having a planar shape which is between the pedestal (11) and the molded article body (3) and internally contiguous with the inner peripheral surface of the peripheral wall (12). In this case, the peripheral wall (12) is set in a certain range in the peripheral direction so as to form an opening (10a) that opens the interior of the clip seat (10). The edge end (14a) of the second reinforcing rib (14) facing the opening (10a) side is provided with a curved shape which is curved inward in the plane direction.

Description

Resin molded product for vehicle and method for producing resin molded product for vehicle

The present invention relates to a resin molded product for a vehicle and a manufacturing method thereof.

Various interior members such as pillar trim (pillar garnish), roof trim, and door trim are arranged on the vehicle interior side of the vehicle body (for example, vehicle body panel). In this interior member, a clip seat is formed on the surface opposite to the design surface. A clip for attaching the interior member to the vehicle body panel is mounted and held on the clip seat, and the interior member is attached to the vehicle body panel by being pushed and fitted into a fitting hole provided in the vehicle body panel. This type of interior member is a resin molded product integrally formed by injection molding in which a molten resin is injected into a cavity from a gate of an injection mold.

For example, Patent Document 1 discloses that when a molten resin is injected into a cavity to form a resin molded product, a gas vent pin is set in the mold so that no gas accumulation occurs and a short shot is not generated. A technique for preventing this is disclosed. This technique is applied to a location where gas accumulation is likely to occur, such as the tip end of a guide rib formed in a clip seat of a resin molded product.

JP 2010-105283 A

However, according to the technique disclosed in Patent Document 1, it is necessary to set a vent pin on the mold, which may lead to an increase in cost. Further, when the setting position of the gas vent pin is different from the position where the short shot is generated, there is a problem that the effect of the gas vent pin cannot be obtained sufficiently.

The present invention has been made in view of such circumstances, and an object thereof is to provide a resin molded product for a vehicle that is effective in suppressing short shots and a method for manufacturing the same.

In order to solve such a problem, a first invention is a vehicle having a molded product body that is attached to a vehicle body, and a clip seat that is integrally formed with the molded product body and that mounts and holds a clip that fits into the vehicle body. Providing resin molded products. In this case, the clip seat includes a planar pedestal portion to which the clip is attached, a vertical wall-shaped peripheral wall portion that rises from the molded product body and is connected to the peripheral edge portion of the pedestal portion, and the pedestal portion and the molded product body. And a planar reinforcing rib that is disposed between the inner peripheral surface and the inner peripheral surface of the peripheral wall portion. Here, the peripheral wall part is set over the circumferential direction in a certain range so as to form an open part that opens the inside of the clip seat. And the edge part of the reinforcement rib which faces an open part side is equipped with the curve shape which curves toward the inward of a surface direction.

Here, in the first invention, it is preferable that the clip seat further has a clip receiving rib that stands on the reinforcing rib so as to bisect the edge portion and receives the head of the clip that is mounted and held on the pedestal portion. . In this case, it is desirable that the edge portion has a curved shape that curves inward in the surface direction in each range separated by the clip receiving rib.

In the first invention, the curved shape is preferably an arc shape that enters inward toward the center.

Further, the second invention provides a method for producing a resin molded product for a vehicle having a molded product body attached to the vehicle body and a clip seat for mounting and holding a clip fitted to the vehicle body. This clip seat is placed between the flat base part where the clip is mounted, the vertical wall-shaped peripheral wall part that rises from the molded product body and connects to the peripheral part of the base part, and the base part and the molded product body A flat reinforcing rib that is inscribed in the inner peripheral surface of the peripheral wall portion, and the peripheral wall portion is set in the circumferential direction within a certain range so as to form an open portion that opens the interior of the clip seat. ing. The manufacturing method injects a molten resin into a cavity from a gate of an injection mold, and causes the injected molten resin to flow from the molded product main body to the pedestal portion side of the clip seat. Is integrally formed. In this case, in the cavity for forming the reinforcing rib, a portion corresponding to the edge of the reinforcing rib facing the open portion is set to a curved shape that curves inward.

In the second invention, it is preferable that the clip seat further has a clip receiving rib that stands on the reinforcing rib so as to bisect the edge portion and receives the head of the clip attached to the pedestal portion. In this case, in the cavity for molding the reinforcing rib, the portion corresponding to the edge portion of the reinforcing rib facing the open portion side is set to a curved shape that curves inward in each range separated by the clip receiving rib. It is desirable that

According to the present invention, since the molten resin easily spreads over the entire area of the reinforcing rib, the occurrence of short shots can be suppressed.

FIG. 1 is a front view schematically showing a configuration of a trim according to the present embodiment. FIG. 2 is a perspective view schematically showing a configuration of a clip seat set on the back side of the trim shown in FIG. FIG. 3 is a cross-sectional view showing a trim mounting state. FIG. 4 is an explanatory diagram showing a concept relating to a trim manufacturing method.

FIG. 1 is a front view schematically showing the configuration of the trim 1 according to the present embodiment. FIG. 2 is a perspective view schematically showing the configuration of the clip seat 10 set on the back side of the trim 1 shown in FIG. FIG. 3 is a cross-sectional view showing an attached state of the trim 1.

The trim 1 according to the present embodiment is a vehicle interior member such as a door trim or a rear side trim, for example, and is disposed on the vehicle compartment side of the vehicle body panel 5. The trim 1 includes a trim base 2 and a skin 7.

The trim base 2 is molded into a required shape by injection molding using an appropriate synthetic resin material. The skin 7 is, for example, a synthetic resin sheet material having cushioning properties and decorating properties. This skin 7 is bonded to the surface of the trim base 2 (design surface positioned on the vehicle compartment side) by, for example, hot press molding.

In addition, the skin 7 may not be provided in the whole area of the trim base 2 but may be provided partially in a required range of the trim base 2. Further, the trim 1 may be constituted only by the trim base 2. In this case, the surface of the trim base 2 may be embossed or the like so as to have design properties.

The trim base 2 has a base body 3 that covers the vehicle compartment side of the vehicle body panel 5 and a clip seat 10 that mounts and holds a clip 4 made of synthetic resin that fits into the vehicle body panel 5. The clip seat 10 is integrally formed on the back surface (the surface opposite to the design surface) of the base body 3, and a plurality of the clip seats 10 are erected on the peripheral edge of the trim base material 2 with a predetermined interval.

Hereinafter, the clip seat 10 which is one of the features of the present embodiment will be described. The clip seat 10 is mainly composed of a pedestal portion 11, a peripheral wall portion 12, a first reinforcing rib 13, a second reinforcing rib 14, and a clip receiving rib 15, and these elements are integrally formed. Yes. The clip seat 10 is formed by using a slide core mold at the time of injection molding of the trim base 2, and a part thereof (a part corresponding to the moving direction of the slide core mold) is formed in a box shape opened as an opening portion 10a. Has been.

The pedestal portion 11 is a planar portion corresponding to the upper end wall of the clip seat 10. In the center of the pedestal 11, a clip engagement hole 11 a that holds the clip 4 by engaging a constricted portion of the clip 4 is formed. The pedestal 11 is provided with a notch 11b for slidingly mounting the clip 4 so as to communicate with the clip engagement hole 11a. Since the slide mounting of the clip 4 is performed from the open portion 10 a side of the clip seat 10, the cutout portion 11 b is set on the open portion 10 a side of the pedestal portion 11.

The peripheral wall portion 12 is a vertical wall-shaped portion that rises from the base body 3 and is connected to the peripheral portion of the pedestal portion 11. The peripheral wall portion 12 is set in the circumferential direction (circumferential direction of the peripheral edge portion of the pedestal portion 11) in a certain range excluding the opening portion 10a, and the inside of the clip seat 10 is opened by the opening portion 10a.

The first reinforcing rib 13 is provided on the lower end side of the peripheral wall portion 12, that is, on the base end side connected to the base body 3, and is a planar portion that is inscribed (connected) to the inner peripheral surface 12 a of the peripheral wall portion 12. is there. The first reinforcing rib 13 forms a surface (or a substantially parallel surface) parallel to the pedestal portion 11. The first reinforcing rib 13 is set to ensure the strength of the clip seat 10. In the first reinforcing rib 13, the edge portion 13a facing the open portion 10a is set in a linear shape.

The second reinforcing rib 14 is a planar portion that is provided between the base portion 11 and the base body 3 and is inscribed (connected) to the inner peripheral surface 12a of the peripheral wall portion 12. The second reinforcing rib 14 forms a surface (or substantially parallel surface) parallel to the pedestal portion 11 and is set to be thinner than the peripheral wall portion 12. The second reinforcing rib 14 is set to secure the strength of the clip seat 10 and to hold a later-described clip receiving rib 15.

In the second reinforcing rib 14, the edge portion 14a of the second reinforcing rib 14 facing the open portion 10a has a curved shape that curves inward in the surface direction. In this embodiment, the edge part 14a by the side of the open part 10a is divided into two by the clip receiving rib 15, and it is set to the curve shape in each range 14a1, 14a2 separated by the said clip receiving rib 15. FIG. The curved shape is, for example, an arc shape (crescent shape) that enters inward toward the center.

The clip receiving rib 15 is a plate-like portion that receives the head of the clip 4 mounted on the pedestal portion 11, and stands on the second reinforcing rib 14. The clip receiving rib 15 is disposed at the center of the second reinforcing rib 14 so as to bisect the edge portion 14a of the second reinforcing rib 14 facing the open portion 10a.

When the trim 1 having such a configuration is disposed on the vehicle body panel 5, the clip 4 is mounted and held in the clip engagement hole 11 a of the base portion 11 in each clip seat 10. Then, in a state where the trim 1 is disposed at the corresponding position of the vehicle body panel 5, the corresponding portion of the clip seat 10 is hit from the vehicle compartment side. External force resulting from the hitting acts on the head of the clip 4 through the clip receiving rib 15, and this is applied as pressure input of the clip 4 to the mounting hole 6 of the vehicle body panel 5. The clip 4 is press-fitted into the mounting hole 6 of the vehicle body panel 5. Thus, the trim 1 is attached so as to cover the vehicle compartment side of the vehicle body panel 5 (see FIG. 3).

Next, a method for manufacturing the trim 1 according to this embodiment will be described. FIG. 4 is an explanatory diagram showing a concept relating to a method for manufacturing the trim 1. The trim base material 2 of the trim 1 having the above-described configuration is manufactured by injecting molten resin into the cavity from the gate of the injection mold, and integrally molding the base body 3 and the clip seat 10 (resin molding). Product).

At the time of injection molding, the molten resin injected into the cavity flows from the base body 3 to the upper end side of the clip seat 10 (the flow of the molten resin is indicated by an arrow in the figure). At this time, the molten resin flows in the cavity in the order of low flow resistance. In the structure of the clip seat 10 described above, the flow resistance of the portion corresponding to the thin second reinforcing rib 14 is large, and the molten resin finally spreads into the cavity in which the second reinforcing rib 14 is formed.

For this reason, the molten resin is difficult to spread due to the influence of the molten resin gas or the like on the tip end side of the cavity for forming the second reinforcing rib 14, that is, the edge portion 14a side of the second reinforcing rib 14 facing the open portion 10a side. It becomes a tendency (occurrence of short shot).

Therefore, in the cavity for molding the second reinforcing rib 14, the portion corresponding to the edge portion 14a of the second reinforcing rib 14 facing the open portion 10a is set to a curved shape that curves inward. . The curved shape is set in each range separated by the clip receiving rib 15. With this setting, in the clip seat 10 of the trim base 2 as a molded product, the edge portion 14a of the second reinforcing rib 14 facing the open portion 10a has a curved shape that curves inward in the surface direction. Will be prepared.

As described above, the trim 1 according to the present embodiment includes the base body 3 attached to the vehicle body, and the clip seat 10 that is mounted integrally with the base body 3 and that holds the clip 4 fitted to the vehicle body panel 5. Have. In this case, the clip seat 10 includes a planar pedestal portion 11 on which the clip 4 is mounted, a vertical wall-shaped peripheral wall portion 12 that rises from the base body 3 and is connected to the peripheral portion of the pedestal portion 11, and a pedestal portion. 11 and the base body 3, and a planar second reinforcing rib 14 that is inscribed in the inner peripheral surface 12 a of the peripheral wall portion 12. Here, the peripheral wall part 12 is set over the circumferential direction in a certain range so as to form an open part 10 a that opens the inside of the clip seat 10. And the edge part 14a of the 2nd reinforcement rib 14 which faces the open part 10a side is provided with the curve shape which curves toward the inward of a surface direction.

In the trim 1, which is a resin molded product, the second reinforcing rib 14 has a large flow resistance of the molten resin. Therefore, the second reinforcing rib 14 is affected by the gas in the molten resin, so that the second reinforcing rib 14 has a short shot on the edge 14a side. Tends to occur. In that respect, according to the present embodiment, by providing the curved shape, the distance from the molten resin inflow side (the peripheral wall portion 12 side) to the edge portion 14a is shortened. Thereby, it becomes easy for molten resin to spread over the whole area (edge part 14a) of the 2nd reinforcement rib 14, and generation | occurrence | production of a short shot can be suppressed.

And according to this embodiment, since the occurrence of short shots can be appropriately suppressed by the rib shape itself, there is no need to set a vent pin on the injection mold. Thereby, the cost increase accompanying addition of a pin can be suppressed.

Moreover, although it is conceivable to set the second reinforcing rib 14 to be thick and suppress the occurrence of short shots, there is a concern about the occurrence of sink marks. If such sink marks appear on the design surface, the appearance performance of the product is deteriorated. However, in the present embodiment, it is possible to suppress the occurrence of short shots without increasing the thickness, and thus it is possible to suppress a decrease in appearance performance.

In the present embodiment, the edge portion 14a of the second reinforcing rib 14 is set in a curved shape that curves inward in the surface direction in each of the ranges 14a1 and 14a2 separated by the clip receiving rib 15. Yes.

Since the clip receiving rib 15 is erected on the second reinforcing rib 14, the molten resin also flows from the clip receiving rib 15 into the second reinforcing rib 14. Therefore, by setting the respective ranges 14a1 and 14a2 separated by the clip receiving ribs 15 in a curved shape, the molten resin spreads over the entire area of the second reinforcing ribs 14 (particularly, the respective ranges 14a1 and 14a2 of the edge portion 14a). It becomes easy and generation | occurrence | production of a short shot can be suppressed.

Also, in the present embodiment, the curved shape is an arc shape that enters inward toward the center.

In the edge part 14a (14a1, 14a2) of the 2nd reinforcement rib 14, generation | occurrence | production of a short shot becomes easy to occur toward the center part. Therefore, by adopting such an arc shape, the molten resin is surely distributed. Thereby, generation | occurrence | production of a short shot can be suppressed.

In the present embodiment, the trim 1 is manufactured by injecting molten resin into the cavity from the gate of the injection mold, and then injecting the injected molten resin from the base body 3 to the pedestal 11 side of the clip seat 10. And the base body 3 and the clip seat 10 are integrally molded. And in the cavity which shape | molds the 2nd reinforcement rib 14, the part corresponding to the edge part 14a of the 2nd reinforcement rib 14 which faces the open part 10a side is set to the curve shape which curves inward.

In the cavity for molding the trim 1, since the flow resistance is large on the edge 14a side of the second reinforcing rib 14, a short shot tends to occur due to the influence of gas in the molten resin. In this regard, according to the manufacturing method of the present embodiment, in the cavity in which the second reinforcing rib 14 is formed, the distance from the molten resin inflow side (the peripheral wall portion 12 side) to the edge portion 14a is shortened. As a result, the molten resin easily spreads over the entire cavity (in particular, the edge portion 14a) in which the second reinforcing rib 14 is molded, and the occurrence of short shots can be suppressed.

As described above, the vehicle interior material and the manufacturing method thereof according to the embodiment of the present invention have been described, but the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the present invention. Needless to say. For example, the present invention can be widely applied not only to vehicle interior materials but also to resin molded products (vehicle resin molded products) attached to a vehicle body.

Further, the above-described curved shape may be applied to the edge portion of the first reinforcing rib.

DESCRIPTION OF SYMBOLS 1 Trim 2 Trim base material 3 Base material body 4 Clip 5 Car body panel (vehicle body)
7 skin 10 clip seat 10a open part 11 pedestal part 11a clip engagement hole 11b notch 12 peripheral wall part 12a inner peripheral surface 13 first reinforcing rib 13a edge end part 14 second reinforcing rib 14a edge end part 15 clip receiving rib

Claims

In resin molded products for vehicles,
A molded body attached to the vehicle body;
The molded product body is integrally molded, and has a clip seat for mounting and holding a clip fitted to the vehicle body,
The clip seat is
A planar pedestal to which the clip is mounted;
A vertical wall-shaped peripheral wall portion that rises from the molded product body and is connected to a peripheral edge portion of the pedestal portion;
A flat reinforcing rib disposed between the pedestal portion and the molded product main body and inscribed in the inner peripheral surface of the peripheral wall portion;
The peripheral wall portion is set over the circumferential direction in a certain range so as to form an open portion that opens the inside of the clip seat,
The resin molded product for a vehicle, wherein an edge portion of the reinforcing rib facing the open portion has a curved shape that curves inward in the surface direction.
The clip seat is
A clip receiving rib that stands on the reinforcing rib so as to bisect the edge, and receives the head of the clip that is mounted and held on the pedestal,
2. The vehicle resin molded product according to claim 1, wherein the edge portion has a curved shape that curves inward in the surface direction in each range separated by the clip receiving rib. 3.
3. The resin molded product for a vehicle according to claim 2, wherein the curved shape is an arc shape that enters inward toward a center portion thereof.
A molded body attached to the vehicle body;
In a manufacturing method of a resin molded product for a vehicle having a clip seat for mounting and holding a clip fitted to the vehicle body,
The clip seat is
A planar pedestal to which the clip is mounted;
A vertical wall-shaped peripheral wall portion that rises from the molded product body and is connected to a peripheral edge portion of the pedestal portion;
A flat reinforcing rib disposed between the pedestal portion and the molded product main body and inscribed in the inner peripheral surface of the peripheral wall portion;
The peripheral wall portion is set over the circumferential direction in a certain range so as to form an open portion that opens the inside of the clip seat,
The manufacturing method includes:
The molten resin is injected into the cavity from the gate of the injection mold, and the injected molten resin is caused to flow from the molded body to the pedestal side of the clip seat, thereby connecting the molded body and the clip seat. A process of integrally molding,
In the cavity for molding the reinforcing rib, a portion corresponding to the edge portion of the reinforcing rib facing the open portion is set to a curved shape that curves inward. Product manufacturing method.
The clip seat is
A clip receiving rib that stands on the reinforcing rib so as to bisect the edge, and receives the head of the clip mounted on the pedestal,
In the cavity for molding the reinforcing rib, the portion corresponding to the edge of the reinforcing rib facing the open portion is set to a curved shape that curves inward in each range separated by the clip receiving rib. The method for producing a resin molded product for a vehicle according to claim 4, wherein: