JPH0553913U - Foam mold - Google Patents

Abstract

(57) [Summary] [Purpose] The bottom wall of the fastener mounting seat is supported from the inside of the set hole to prevent the bottom wall of the fastener mounting seat from bending due to the foaming pressure of the foam molding raw material, so that the surface of the resin molded product does not swell. It is possible to prevent it from occurring and to set the fastener mounting seat securely in the set hole. A structure in which a bottomed tubular resin fastener mounting seat 7 having a fastener mounting hole 21 at one end is set in a setting hole 31 recessed in a molding surface 27a so that a bottom wall 37 projects into a cavity 29. In the foam molding die A for molding the door trim 1 in which the fastener mounting seat 7 is inserted into the foam base material 5 by injecting the foam molding raw material into the cavity 29, the support piece 35 is attached to the bottom wall 33 of the set hole 31. It is provided so as to penetrate through the fastener mounting hole 21 of the fastener mounting seat 7 and contact the bottom wall 37 from the inside.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to improvement of a foam molding die for molding a resin molded product in which a fastener mounting seat is inserted into a foam base material, and particularly to measures for preventing surface defects in the fastener mounting seat portion.

[0002]

[Prior Art]

 Generally, in an automobile body assembly line, when assembling a door trim as an interior part to a door inner panel, a resin fastener mounting seat is provided on the back side of the door trim as disclosed in, for example, Japanese Utility Model Laid-Open No. 64-18614. The door trim is arranged and the fastener attached to the fastener mounting seat is inserted into the insertion hole of the door inner panel to assemble the door trim to the door inner panel.

By the way, there is a fastener mounting seat formed in a tubular shape. When attaching this fastener mounting seat to a resin molded product such as a door trim where the foam base material is integrally molded on the back surface of the skin material, insert one end of the fastener mounting seat into the foam base material as the molded product body. Is done. In this case, when the foam molding raw material of the foam base material enters the inside of the fastener mounting seat, the fastener mounting hole is closed, and the foaming pressure at the time of molding the foam base material is locally reduced, and the surface of the resin molded product is reduced. In order to prevent the occurrence of sink marks, the opening on one end side of the fastener mounting seat to be inserted into the foamed base material is closed with a lid, or, for example, as disclosed in Japanese Utility Model Publication No. 62-95930. Since the beginning, measures have been taken to make it cylindrical with a bottom by installing a bottom wall.

[0004]

[Problems to be solved by the device]

 However, when the bottomed cylindrical fastener mounting seat is inserted into the foamed base material of the resin molded product as described above, the fastener mounting seat is recessed in the molding surface of the molding die so that the bottom wall projects into the cavity. When the foam molding raw material is injected into the cavity while it is set in the set hole, the foaming pressure of the foam molding raw material causes the bottom wall to bend inward, and the foam molding raw material cures in that state. After the mold was removed from the mold, the bending of the bottom wall returned to its original state, and there was a risk that the surface of the resin molded product would bulge and impair its appearance.

The present invention has been made in view of the above points, and an object of the present invention is to improve the mold structure so as to support the bottom wall of the fastener mounting seat from the inside of the set hole of the molding surface. Prevents the bottom wall of the fastener mounting seat from bending due to the foaming pressure of the foam molding material, and prevents the surface of the resin molded product from bulging, and the fastener mounting seat cannot be set securely in the setting hole. And there is.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a solution means of the present invention according to claim 1 is a bottomed cylindrical resin fastener mounting seat having a fastener mounting hole at one end in a set hole recessed in a molding surface. In a foam molding die for molding a resin molded product in which the fastener mounting seat is inserted into the foam base material by injecting the foam molding raw material into the cavity with the wall set so as to project into the cavity, The support piece is formed on the bottom wall of the setting hole so as to penetrate the fastener mounting hole of the fastener mounting seat so as to come into contact with the bottom wall from the inside.

According to a second aspect of the present invention, in the above-described case, the means for solving the problem is to provide an engaging portion that engages with the bottom wall of the fastener mounting seat at the tip of the support piece.

[0008]

[Action]

 With the above construction, in the present invention according to claim 1, the bottom wall of the fastener mounting seat set in the setting hole of the molding surface is inwardly contacted by the support piece protruding from the bottom wall of the setting hole. Since it is supported more, even if the foaming pressure of the foam molding raw material acts on the bottom wall of the fastener mounting seat, the bottom wall can withstand the foaming pressure sufficiently and does not bend inward, and the resin molded product is released from the mold. Swelling of the surface that occurs later is reliably prevented.

In the present invention according to claim 2, since the engaging portion provided at the tip of the support piece is engaged with the bottom wall of the fastener mounting seat, the engaging action causes the fastener mounting seat to be released. It is securely set in the set hole without doing.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment FIG. 4 shows an automobile door trim 1 as a resin molded product. The door trim 1 is made of a hard foam material such as polyurethane on the back surface of a skin material 3 made of polyvinyl chloride or the like. The foam base material 5 is formed integrally. Then, one end of a resin fastener mounting seat 7 is inserted into a required portion of the foamed base material 5 of the door trim 1, and a fastener 9 is attached to the other end of the fastener mounting seat 7 to attach the door trim 1 to the fastener 9. It is designed to be attached to the door inner panel 11 as an assembly through the above.

As shown in FIGS. 2 and 3, the fastener mounting seat 7 includes a cylindrical mounting seat body 13 whose one end (lower end in FIG. 2) is open, and the other end of the mounting seat body 13 is provided. A wall portion 15 for forming a mounting hole is formed (upper end in FIG. 2), and a gourd-shaped fastener mounting hole 21 including a large diameter hole portion 17 and a small diameter hole portion 19 is formed in the wall portion 15. There is. The fastener 9 is attached to the fastener mounting seat 7 by inserting the base portion 9a of the fastener 9 into the large diameter hole portion 17 of the fastener mounting hole 21 and then moving the fastener 9 to the small diameter hole portion 19. .. On the other hand, a disk-shaped lid 23 is fitted into one end side opening of the mounting seat body 13, whereby the fastener mounting seat 7 is formed into a bottomed tubular shape.

Next, a foam molding die A according to an embodiment of the present invention for molding the door trim 1 in which the fastener mounting seat 7 is inserted into the foam base material 5 as described above will be described with reference to FIG.

In FIG. 1, 25 is a lower mold and 27 is an upper mold, and a cavity 29 for molding the door trim 1 is formed between the lower mold 25 and the upper mold 27. Further, the molding surface 27a of the upper mold 27 is provided with a plurality of (only one is shown in FIG. 1) set holes 31, 31 for setting the fastener mounting seat 7, and each of the set holes is formed. As a feature of the present invention, a support piece 35 penetrates through the fastener mounting hole 21 of the fastener mounting seat 7 on the bottom wall (upper wall) 33 of the inner wall 31 of the bottom wall 37 (inner wall of the lid 23). It is integrally projected so as to come into more contact.

In the foam molding die A, the fastener mounting seat 7 is set in each of the setting holes 31 of the molding surface 27 a such that the bottom wall 37 is projected into the cavity 29, and the foam is formed in the cavity 29. By injecting a molding raw material, the door trim 1 in which the fastener mounting seat 7 is inserted into the foam base material 5 is molded.

As described above, in this embodiment, when the fastener mounting seat 7 is set in the setting hole 31, the tip of the support piece 35 is brought into contact with the bottom wall 37 (inner wall of the lid 23) of the fastener mounting seat 7. Since the bottom wall 37 is supported from the inside by the supporting piece 35, even if the foaming pressure of the foam molding raw material acts on the bottom wall 37, the bottom wall 33 can sufficiently withstand the foaming pressure and the inside wall is closed. This prevents the bottom wall 37 from returning when the door trim 1 is released from the mold without being bent, and it is possible to reliably prevent the surface of the door trim 1 from bulging.

(Second Embodiment) FIGS. 5 and 6 show a second embodiment of the present invention. In this embodiment, a bulge portion 39 as an engaging portion is formed at the tip of a support piece 35, and a lid is provided. When the engaging projection 41 having the engaging groove 41a is projected on the inner wall of the body 23 and the fastener mounting seat 7 is set in the setting hole 31, the bulging portion 39 of the support piece 35 is fixed to the bottom wall of the fastener mounting seat 7. 37 (engagement groove 41a of the engagement protrusion 41 of the lid 23). Other than that, the configuration is the same as that of the above-described first embodiment, and therefore, the same components are designated by the same reference numerals and detailed description thereof will be omitted.

Therefore, in this embodiment, it is possible to obtain the same effects as those of the first embodiment. In addition, in this embodiment, since the bulging portion 39 of the support piece 35 is engaged with the engaging groove 41a of the engaging projection 41 of the fastener attaching seat 7, this engaging action causes the fastener attaching seat 7 to move. It can be reliably set in the set hole 31 without being detached.

In each of the above-described embodiments, the support piece 35 is provided integrally with the upper die 27 so as to project, but it may be attached separately.

In addition, in each of the above-described embodiments, the lid body 23 that constitutes the bottom wall 37 of the fastener mounting seat 7 is configured separately from the mounting seat body 13, but the invention is not limited to this, and the lid body 23 may be used, for example. The main body 13 may be integrally connected with a connecting band, and the connecting band may be bent as a hinge to fit the lid 23 into the insert side opening of the mounting seat main body 13. Further, the lid 23 may not be provided, and the bottom opening may be formed by blow molding to close the insert side opening from the beginning.

Further, in the second embodiment, the bulging portion 39 at the tip of the support piece 35 is engaged with the engagement groove 41a of the engagement protrusion 41 of the lid 23, but conversely, The engaging groove may be provided on the 35 side and the bulging portion may be provided on the lid 23 side.

Furthermore, in each of the above-described embodiments, the case where the resin molded product is the door trim 1 has been shown, but it may be an instrument panel or the like, and may be a resin molded product other than an automobile. ..

[0023]

[Effect of the device]

 As described above, according to the first aspect of the present invention, since the bottom wall of the fastener mounting seat is supported from the inside by the support piece, it is possible to eliminate the inward bending of the bottom wall due to the foaming pressure of the foam molding raw material. Therefore, it is possible to reliably prevent the occurrence of bulging on the surface of the resin molded product.

In the present invention according to claim 2, since the engaging portion at the tip of the support piece is engaged with the bottom wall of the fastener mounting seat, the engaging hole prevents the fastener mounting seat from being detached. Can be reliably set.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a foam molding die according to a first embodiment showing a set hole portion in an enlarged manner.

FIG. 2 is a vertical sectional view of a fastener mounting seat according to the first embodiment.

FIG. 3 is a perspective view of a fastener mounting seat in the first embodiment.

FIG. 4 is a vertical sectional side view of a door trim in which a fastener mounting seat is inserted.

FIG. 5 is a view corresponding to FIG. 1 of the second embodiment.

FIG. 6 is a perspective view of a lid of a fastener mounting seat in the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Door trim (resin molding) 5 ... Foam base material 7 ... Fastener mounting seat 21 ... Fastener mounting hole 27a ... Molding surface 29 ... Cavity 31 ... Set hole 33, 37 ... Bottom wall 35 ... Support piece 39 ... Bulging part ( Engagement part) A ... Foaming mold

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Claims (2)

[Scope of utility model registration request] 1. A bottomed cylindrical resin fastener mounting seat having a fastener mounting hole at one end in a set hole recessed in the molding surface is set so that the bottom wall projects into the cavity. A foam molding die for molding a resin molded product in which the fastener mounting seat is inserted into a foam base material by injecting a foam molding raw material into a foam base material, wherein a support piece is mounted on the bottom wall of the set hole. A foam molding die, which is provided so as to penetrate through the fastener mounting hole of the seat and abut on the bottom wall from the inside. 2. A foam molding die, wherein an engaging portion that engages with a bottom wall of the fastener mounting seat is provided at a tip of the support piece.