JPH0618719B2 - A compression molding method in which metal fittings are attached simultaneously - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a compression molding method in which metal fittings are attached at the same time. More specifically, the surface of a molding base material obtained by compression molding a raw material for molding has a contact surface portion. The present invention relates to a compression molding method for manufacturing a metal fitting-integrated molded product by simultaneously mounting a metal fitting such as a burring retainer together with compression molding.

<Prior Art> The above-described metal fitting-integrated molded product is used as a molded article for interior parts of automobile doors and the like. In the case of producing such a three-dimensional molded article, in the conventional technique, a sheet-shaped raw material containing a thermoplastic resin as a main component or a mat-shaped raw material prepared by mixing a fibrous raw material with a thermosetting resin or the like. 3 (A) and 3 (B) on a molding substrate 25 obtained by cold compression molding or hot compression molding of a molding raw material such as
Contact surfaces 23a and 24a provided at both ends as shown in Fig.
It has a burring part on its center and has metal fittings such as hat type retainers 23 and 24 with clip attachment holes 23d and 24d formed on the central top surface portions 23c and 24c, or by tacking, one by one. Alternatively, a plurality of pieces are post-processed and attached.
Then, the metal fitting integrated mounting product obtained by mounting the retainers 23 and 24 in this manner is attached to the metal inner panel 27 of the automobile door portion with the fastening clip 26 as shown in FIGS. 3 (C) and 3 (D). Etc.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional method, since the metal fitting is attached by the driving method after the molding base material is manufactured, the man-hour is increased, the machining efficiency is poor, and the metal fitting is placed at a predetermined position. Even when mounting, there is a problem that the position is likely to be out of alignment and the positional accuracy with the mounting holes of the inner panel or the like is deteriorated.

Therefore, it is possible to solve the above-mentioned problem by providing a concave groove in the mold and performing compression molding with the metal fitting embedded in the concave groove, and using the method of mounting the metal fitting on the molding base material simultaneously with the compression molding. However, in the fitting-integrated mounting molded product manufactured by such a method, as shown in FIG. 4, a portion of the molding base material 29 where the gap with the retainer 30 is formed becomes an uncompressed portion. There are drawbacks such as bulging on the retainer side and defective molding.

<Means for Solving the Problems> The present invention is a method for producing a molding base material by compression molding a molding raw material using a pair of male and female molds, and a contact surface portion having a mounting piece formed thereon. After mounting the mounting piece of the contact surface part in the concave groove provided on the mold forming surface and dropping it, place the molding raw material on the mold forming surface and perform compression molding to mount the metal contact surface In the method of burying a piece in a molding substrate, the central part of the metal fitting is composed of an upper plate part which is substantially flush with the mold molding surface and a bottom plate part which is recessed in the mold side, and during the compression molding. ,
It is a compression molding method in which metal fittings are attached at the same time, which is characterized in that the protrusion provided in the concave groove is brought into contact with the upper plate portion of the metal fitting through an opening formed in the bottom plate portion.

<Operation> By using the above configuration, since the portion of the raw material for molding located in the gap is pressed by the upper plate of the metal fitting and compression-molded, it is possible to eliminate molding defects in the same portion of the molding base material. . Further, since the upper plate portion of the metal fitting is supported during the compression molding by the protrusion provided in the concave groove, even if the upper plate portion has a thin wall, it is not dented. Further, since the metal fitting is attached to the molding base material simultaneously with the compression molding, the number of man-hours of the conventional method is large, and the problems such as poor processing efficiency can be solved.

<Example> Example 1. In FIG. 1 (A), recessed grooves 10 are provided at predetermined positions on the die molding surface 1a of the die 1. The recessed groove 10 has retainer contact surface supporting surfaces 10a at both ends thereof, and a protrusion 10c is formed substantially in the center of the center groove 10b. An upper plate 2a having burring-processed contact surface portions at both ends thereof is provided in the groove 10,
Both ends of the upper plate 2a are welded to be integrally attached to the upper plate 2a, and the central portion is recessed downward in the drawing, and the central portion is made of a metal retainer 2 having an opening 2c.
However, as shown in FIG. 1 (B), it is dropped and accommodated. At this time, as shown in FIG. 1 (C), the retainer 2
The upper surface of the upper plate 2a is flush with the molding surface 1a, and the burring portions of the contact surfaces at both ends of the upper plate 2a are the molding surface 1a.
project from a. Further, the center of the bottom plate 2b is housed in the center groove 10c of the recessed groove 10, and the projection 10c in the recessed groove 10 further includes the bottom plate 2b.
It comes into contact with the central portion of the upper plate 2a through the opening 2c of b and supports it from below. Of course, the retainer may be an integrally formed top plate and bottom plate.

Next, the compression molding process of the molding raw material performed using the mold 1 having the above structure will be described.

First, as shown in FIG. 1 (D), the molding material 3 made of a fibrous mat having a thickness of about 20 mm is placed on the molding surface of the mold 1,
The metal mold 4 forming a pair with is placed on the forming raw fabric 3. The positional relationship in the vicinity of the retainer 2 at this time is as shown in FIG. 1 (E). Next, by moving the mold 1 upward or the mold 4 downward, the molding raw fabric 3 is compression-molded by the molds 1 and 4 as shown in FIG. 1 (F). At this time, the original material 3 is compression-molded by the molds 1 and 4 to 2 mm.
The molding base material 5 has a thickness of approximately the same, and the burring portion of the retainer 2 is buried and fixed in the molding base material 5 as shown in FIG. 1 (G). Here, even if the height of the burring portion of the retainer contact surface portion is higher than the thickness of the molding base material, the die 1,
By pressing 4, the burring portion can be kept within the range of the thickness of the molding substrate 5 without fail.

When the compression molding is completed, the molds 1 and 4 are separated and the pressure is released as shown in FIG.
Then, one side of the fastening clips 6, 7 is attached to the opening 2c of the retainer 2 as shown in FIGS. 1 (I) and (J). Further, FIG. 1 (K) shows an example of using a retainer -21 in which an opening at the central portion of the bottom plate is provided on the same plane as this central portion.
Reference numerals a, 21b, and 21c denote a top plate, a bottom plate, and an opening, respectively.

After the mounting, the door 9 as shown in FIG.
Clip mounting hole 9b provided on the inner panel 9a of the
By attaching the fastening clips 6, 7 or 8 to the vehicle, the automobile door portion as shown in FIG. 1 (M) can be obtained.

Example 2. FIG. 2 (A) shows a mold 11 and a retainer 13 used in another example of the present invention. In this example, instead of forming a recess groove for embedding the retainer in the die molding surface itself, a required number of fitting grooves for the split body 12 are formed in the die molding surface 11a, and the retainer embedding groove is formed in this groove. The divided body 12 provided with the concave groove is fitted and used. In the figure, 12a, 12b, and 12c are a retainer contact surface supporting surface, a central groove, and a protrusion, respectively. Also, the retainer 13 is open.
Except for the shape of 13c, it has the same shape as the retainer 2 and is composed of an upper plate 13a and a bottom plate 13b. Second
FIG. 1B shows a state in which the retainer 13 is dropped and housed in the concave groove of the split body 12. A specific compression molding method using the mold 11 and the retainer 13 is the same as that in the first embodiment, and therefore the description thereof is omitted.

As in the second embodiment, instead of directly forming and using a concave groove for embedding a metal fitting or the like on a molding surface of a mold, a concave groove for embedding a metal fitting such as a retainer is provided and Even if the molding shape is changed and the die is changed by using the detachable split body, a groove for embedding the split body is formed in the die, and the above-mentioned split body is used for this groove. Since the compression molding can be performed in the same manner only by embedding it in the mold, it is possible to reduce the mold processing cost by the amount corresponding to the groove processing. Further, in the case of compression-molding a molding base material that does not require mounting of metal fittings, it may be configured such that a split body having no recessed groove is inserted into a groove for embedding the split body of the mold. There is also an advantage that two types of molded products can be made with.

<Effects of the Invention> The compression molding method of the present invention is as described above, and the portion of the original material located in the gap is pressed and pressed by the upper plate portion of the metal fitting during compression molding. As a result, the molding failure of the molding substrate can be eliminated. Also, since the metal fitting is attached to the molding base material at the same time as compression molding, all the problems of the conventional method described above can be solved.
Simultaneously with compression molding, the metal fitting can be accurately attached to a predetermined position of the molding substrate in one step. For this reason, post-processing becomes unnecessary and the production efficiency can be greatly improved. In addition to this, for example, the tip of the burring portion of the retainer can be prevented from appearing on the surface of the molding substrate, and the surface can always be molded flush.

Further, it has been confirmed by the present inventor that the fitting strength of the metal fitting to the molded substrate can be significantly increased as compared with the conventional method. This mounting strength improvement will be described in detail. Like the retainer used in the embodiment, a retainer having two burring processing parts on each of the left and right contact surfaces, a total of four burring parts, is used to integrate the metal fittings by the conventional method. When a mounting molded product is manufactured, the mounting strength of one retainer is 32 to 35 kg.
(Approximately 8 to 9 kg per burring portion), whereas in the case of the present invention, it is 55 to 60 kg (also approximately 1
4 to 15 kg), and the mounting strength is about 1. compared with the conventional method.
7 times improved.

[Brief description of drawings]

1 (A) to (M) are explanatory views of an embodiment of the present invention, and FIG.
(A) and (B) are explanatory views of other examples, FIGS. 3 (A) and (B) are perspective views of a retainer used in a conventional example, and FIGS. 3 (C), (D) and 4 are It is explanatory drawing of a prior art. 1,4 ... Mold, 2,13,21,23,24,31 ...
… Retainer, 3 …… Molding material, 5,25,29 …… Molding base material, 6,7,8,26 …… Fastening clip, 10…
… Concave groove, 12 …… Divided body, 9a, 27 …… Inner panel.

Claims (1)

[Claims] 1. A method for producing a molding base material by compression molding a molding raw material using a pair of male and female molds, wherein a metal fitting having a contact surface portion on which a mounting piece is formed is formed on the molding surface. A method of burying the mounting piece of the metal fitting contact surface in the molding base material by placing the mounting piece of the contact surface part on the surface in the recessed groove and dropping it, then placing the molding raw material on the mold molding surface and compression molding In, the central portion of the metal fitting is composed of an upper plate portion that is substantially flush with the mold molding surface and a bottom plate portion that is recessed toward the mold, and during the compression molding,
A compression molding method for simultaneously mounting metal fittings, characterized in that the protrusion provided in the groove is brought into contact with the upper plate portion of the metal fitting through an opening formed in the bottom plate portion.