JP2001277312A - Resin molding and method for molding the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molding for obtaining good mold releasability without affecting an adverse influence to advancing and retracting operations of a slide dowel and not bringing about a strain deformation at a clip mounting seat in the molding integrally formed with the seat having an undercut-like part and a method for molding the same and the method for molding the same. SOLUTION: A restricted part such as a clamping pin 25 or the like extended along a mold drawing direction of a core die 60 is provided at a fixed rail 24 extended along a mold drawing direction of the core die 60 at the clip mounting seat 20 or a part near the seat. Thus, when the slide dowel 70 is retracted, the molding 10 is engaged with the die 60 to suppress the strain deformation to be applied to the seat 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded article having a clip mounting seat provided with an undercut-shaped portion and a method of molding the same. The present invention relates to a resin molded product that can suppress deformation of a seat and can be expected to have good demoldability, and a molding method thereof.

[0002]

2. Description of the Related Art As shown in FIG. 10, for example, a pillar trim 1 provided inside a pillar panel of a vehicle is made of an injection molded body of a synthetic resin such as a polypropylene (PP) resin or an ABS resin, and is formed in a longitudinal direction thereof. The clip mounting seat 2 is integrally formed on the back surface at predetermined intervals along the rear surface. Then, the iron clip 3 is attached to the clip mounting seat 2,
The pillar trim 1 is mounted on the vehicle body panel 4 by pressing the iron clip 3 into the mounting hole 4a of the vehicle body panel 4.

As shown in FIG. 11, the clip mounting seat 2 has a stopper side wall 2b integrally formed on both sides of a mounting column 2a for supporting the iron clip 3 for restraining the iron clip 3 from shifting in the left-right direction. Formed and iron clip 3
An undercut-like convex portion 2c for fixing is provided on one surface side of the mounting support 2a so that does not fall off the mounting support 2a.

[0004] The pillar trim 1 and the clip mounting seat 2 are integrally formed by an injection molding die. However, since the clip mounting seat 2 is provided with an undercut-shaped convex portion 2c, the injection molding die is not provided. A slide piece that slides in connection with the movement of the core mold is installed, and the operation of the slide piece forms the undercut-shaped convex portion 2a. The sliding direction of the slide piece is in the direction of the arrow B with respect to the direction A of the core die.

[0005]

In order to integrally form the clip mounting seat 2 having the undercut-shaped projection 2c on the pillar trim 1 as described above, a molding die having a slide piece is used. In the above, when the mold is opened after the molding, the mounting column 2a and the stopper side wall 2b of the clip mounting seat 2 are retracted in the retracting direction of the slide piece with the retracting operation of the slide piece, and the retraction force causes distortion and deformation. If a large distortion occurs, the iron clip 3
It has been pointed out that it is difficult to properly mount the camera.

At the same time, it has been pointed out that if the clip mounting seat 2 is retracted in the retreating direction of the slide piece, a smooth removal operation of the resin molded product cannot be expected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a resin molded body integrally formed with a clip mounting seat having an undercut-like portion, and a molding method therefor, comprises a slide piece for forming an undercut-like portion. It is an object of the present invention to provide a resin molded body in which the clip mounting seat is not retracted in the retreating direction, the deformation of the clip mounting seat does not occur, and a smooth demolding operation is possible, and a method of forming the same.

[0008]

In order to achieve the above-mentioned object, the present invention provides a method of injection-filling a molten resin into a product cavity formed by clamping a cavity mold and a core mold.
A clip mounting seat having an undercut-shaped portion is integrally formed by a slide piece that slides in conjunction with the operation of the core mold. It is characterized in that a restraining portion is provided for engaging and restraining the clip mounting seat from being retracted in the retreating direction of the slide piece.

[0009] Here, the resin molding is a front pillar,
In addition to pillar trims installed in various pillar panels such as a center pillar and a rear pillar, all of those made of synthetic resin injection moldings such as door trims and rear side trims are included.

A clip mounting seat integrally formed on the back surface of the resin molded body includes a mounting column on which the clip is mounted, and a stopper provided on the left and right sides of the mounting column for positioning the clip at an appropriate position and preventing left and right displacement. It consists of a side wall and an undercut-shaped projection provided on the mounting column for retaining the clip.

The restraining portion may be a fixing rail provided on the clip mounting seat along the core die removing direction, a fixing pin provided near the clip mounting seat at a position symmetrical to the slide piece, and the like. The rail can be formed on the side wall of the stopper or the wall surface of the mounting column.

Further, the method for molding a resin molded article according to the present invention is characterized in that a molten resin is injected and filled into a product cavity formed by clamping the cavity mold and the core mold, and the slide is provided in the core mold so as to be able to advance and retreat. By driving the piece,
In a method of molding a resin molded body integrally provided with a clip mounting seat having an undercut-shaped portion, in conjunction with mold clamping of a cavity mold and a core mold, a slide piece is moved forward to complete injection molding, and then a cavity is formed. When the slide piece is moved backward by linking with the mold opening of the mold and the core mold, the resin molded body is restrained to the core mold via the restraining portion, thereby preventing the clip mounting seat from being pulled in the slide piece backward direction. It is characterized by having done.

Therefore, according to the present invention, when the core mold is removed from the cavity mold after the injection molding, the slide piece also retreats in conjunction with the mold, but the clip mounting seat is provided with the core mold in the mold removing direction. The resin molded body and the core mold can be maintained in an engaged state by a fixed rail provided along the fixed rail or a fixed pin extending along the core mold removing direction, so that the slide piece is moved from the clip mounting seat. Even if you go away
The clip mounting seat is not pulled in along the retreating direction, and the clip mounting seat is not deformed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a resin molded product and a molding method according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a center pillar trim to which the resin molding according to the present invention is applied. FIGS. 2 to 6 show a first embodiment of a clip mounting seat formed integrally with the center pillar trim shown in FIG. 2 is a perspective view of the clip mounting seat, FIG. 3 is a perspective view of the clip mounting seat, FIG. 5 is a plan view of the clip mounting seat, FIG. It is each explanatory drawing which shows the state at the time of mold release, respectively.

7 to 9 show a second embodiment of the clip mounting seat formed on the center pillar trim. FIG. 7 is a sectional view of the clip mounting seat, FIG. 8 is a plan view of the clip mounting seat, and FIG. It is explanatory drawing which shows the mold opening initial state of the shaping | molding die used for shaping | molding the clip mounting seat.

In FIG. 1, the center pillar trim 10
The clip mounting seats 20 are integrally formed at four locations on the rear surface of the center pillar panel 40 at appropriate intervals along the vertical direction. The center pillar trim 10 is mounted on the center pillar panel 40 on the vehicle body side by press-fitting the iron clip 30 into the mounting hole 41.

As shown in FIGS. 2 to 4, a clip mounting seat 20 integrally formed on the back surface of the center pillar trim 10 has a plate-shaped mounting column 21 for mounting an iron clip 30, and a mounting column 21 for mounting the iron clip 30. A stopper side wall 22 provided integrally on both sides of the mounting post 21 so as to be positioned on the left and right sides of the support column 21 and maintain a proper mounting posture of the iron clip 30 so as not to be displaced to the left and right sides;
1 is provided with an undercut-shaped projection 23 provided on one surface of the mounting column 21 so that the iron clip 30 mounted on the column 1 does not fall off.

Further, in the present invention, a slide piece, which will be described later, is used for the clip mounting seat 20 because the clip mounting seat 20 forms the undercut-shaped convex portion 23. A fixed rail 24 is provided along the inner surface of the rear side edge of the stopper side wall 22 so as not to cause distortion and deformation. .

The operation of the fixed rail 24 will be described with reference to FIGS. 5 and 6. As shown in FIG. 5, molten resin is filled in a product cavity C formed by clamping the cavity mold 50 and the core mold 60. The center pillar trim 10 is formed into a required shape by injection filling. At the time of this mold clamping, the slide piece 7 provided on the parting surface of the core mold 60 is formed.
0 operates, and the undercut-shaped convex portion 23 in the clip mounting seat 20 can be formed.

At this time, the fixed rail 24 provided on the stopper side wall 22 is slidably housed in a rail housing groove 61 formed in the core die 60 by laser processing or the like as shown in FIG. As shown by the arrow in FIG. 6, even if the slide piece 70 moves backward, the fixed rail 24 on the rear side edge of the stopper side wall 22 is held by the core mold 60, so that this portion serves as a restraining portion (stopper). In order to function, the entire clip mounting seat 20 is
And the clip mounting seat 20 is not distorted or deformed.

Therefore, since the clip mounting seat 20 is not distorted and deformed, the mounting operation when mounting the iron clip 30 on the clip mounting seat 20 can be performed smoothly, and the removal work of the center pillar trim 10 is also easy. It becomes something.

The fixed rail 24 is connected to the stopper wall 2.
2 are integrally provided on the inner surface side of the rear side edge.
It may be provided along the direction in which the core die 60 is removed from the surface opposite to the surface on which the first undercut convex portion 23 is installed, and the installation location of the fixed rail 24 is not particularly limited.

FIGS. 7 to 9 show a second embodiment of the present invention, in which a fixing pin 25 is provided instead of the fixing rail 24, as shown in FIGS. A fixing pin 2 is provided on the rear surface of the center pillar trim 10 at a position opposite to the slide piece 70 based on the clip mounting seat 20.
5 are protrudingly formed.

Also in this case, as shown in FIG. 9, after the injection molding, the direction in which the core mold 60 is removed is the direction of arrow A,
When the slide piece 70 moves backward in the direction of arrow B, the fixing pin 25 is in a fitted state in the pin hole 62 of the core mold 60,
Since the fixing pin 25 acts as a restraining portion and both the center pillar trim 10 and the core mold 60 which are resin molded bodies are restrained in the engaged state, the clip mounting seat 20 is pulled in the retreating direction of the slide piece 70. Therefore, no distortion occurs in the clip mounting seat 20. Therefore, the same operation and effect that a good releasing operation and a smooth mounting workability of the iron clip 30 can be expected are provided.

The embodiment described above is applied to the center pillar trim mounted on the center pillar panel. In addition, a clip mounting seat having an undercut-shaped portion such as a front pillar trim, a rear pillar trim, a door trim, and a luggage side trim is provided. The present invention can be applied to all integrally formed resin molded articles.

[0027]

As described above, according to the present invention, the fixing rail is formed on the clip mounting seat, or the fixing pins are provided in the vicinity of the clip mounting seat along the direction in which the core die is removed. Even when the slide piece is retracted, the engagement between the core mold and the resin molded body can be maintained by the fixing rail and the fixing pin, so that the clip mounting seat is not deformed.

Accordingly, good release properties of the resin molded product can be expected, and since there is no distortion deformation in the clip mounting seat, there is an operational effect such as a smooth mounting workability of the clip.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an attached state of a center pillar trim showing one embodiment of a resin molded body according to the present invention.

FIG. 2 is a perspective view showing a first embodiment of a clip mounting seat formed on a center pillar trim shown in FIG. 1, as viewed obliquely from the front.

FIG. 3 is a perspective view of the clip mounting seat shown in FIG. 2 as viewed obliquely from the rear.

FIG. 4 is a plan view of the clip mounting seat shown in FIG. 2;

FIG. 5 is an explanatory view showing a state of the clip mounting seat shown in FIG. 2 during injection molding.

FIG. 6 is an explanatory view showing a state at the time of removing the injection mold from the clip mounting seat shown in FIG. 2;

FIG. 7 is a sectional view showing a second embodiment of a clip mounting seat formed on a resin molded body according to the present invention.

FIG. 8 is a plan view of the clip mounting seat shown in FIG. 7;

FIG. 9 is an explanatory view showing a state when the injection molding die is removed from the clip mounting seat shown in FIG. 7;

FIG. 10 is an explanatory view showing a state in which a conventional center pillar trim is attached to a vehicle body panel.

FIG. 11 is a perspective view showing a conventional clip mounting seat.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Center pillar trim 20 Clip mounting seat 21 Mounting column 22 Stopper side wall 23 Undercut convex part 24 Fixed rail 25 Fixed pin 30 Iron clip 40 Center pillar panel 41 Mounting hole 50 Cavity type 60 Core type 61 Rail accommodation groove part 62 Pin hole 70 Slide Piece A Core die-cutting direction B Slide piece retreat direction C Product cavity

Claims (4)

[Claims] 1. A cavity mold (50) and a core mold (60).
A molten resin is injected and filled into the product cavity (C) formed by the mold clamping, and the slide piece (70) that slides in conjunction with the operation of the core mold (60) forms the undercut-shaped portion (23). Clip mounting seat (20) having
Is a resin molded body (10) integrally formed, and when the slide piece (70) is retracted, the resin molded body (10) engages with the core mold (60) to form the slide piece (70). A resin molded body provided with a restraining portion for preventing the clip mounting seat (20) from being pulled in the retreating direction. 2. The restraining part includes a clip mounting seat (20),
The resin molding according to claim 1, wherein the molding is a fixed rail (24) provided along a direction in which the core mold (60) is removed. 3. A fixing pin (2) extending along the direction in which the core die (60) is removed, on the back side opposite to the slide piece (70), based on the clip mounting seat (20).
The resin molded product according to claim 1, wherein 5) is satisfied. 4. A cavity mold (50) and a core mold (60).
The molten resin is injected and filled into the product cavity (C) formed by the mold clamping, and the undercut-shaped projection (23) is driven by driving the slide piece (70) provided to be able to advance and retreat in the core mold (60). In the method for molding a resin molded body (10) integrally provided with a clip mounting seat (20) having a slide member (70), the slide piece (70) is moved forward in connection with the mold clamping of the cavity mold (50) and the core mold (60). After the operation, the injection molding is completed, and in conjunction with the opening of the cavity mold (50) and the core mold (60), when the slide piece (70) is retracted, the resin molded body (10) is moved to the core mold ( 60. A method for molding a resin molded article, wherein the clip mounting seat (20) is restrained from retracting in the retreating direction by restraining the clip mounting seat (20) in the retreating direction.