JPH045011A - Molding method for synthetic resin molded body with integrated cushion body - Google Patents

Abstract

PURPOSE:To manufacture a molded body with a cushion body embedded therein by providing an opening narrower than the cushion body on the mold wall of a molding die, interposing the cushion body in a space between the opening and an insert disposed in a cavity facing the opening, compressing the same by a clamping means to seal the space, filling a raw material resin, releasing the clamping after resin is cured and releasing. CONSTITUTION:A washer 4 as an insert B is disposed in a molding cavity 7 and a cushion body 3 is placed on the upper face of the washer 4, while a top force provided with an opening 8 having its opening area narrower than the washer 4 is covered on the cushion body 3, and the other end side of a stud bolt 1 is projected out of said opening 8 and a nut 9 as a clamping means is screwed into the projected section. The peripheral section of cushion body 3 is compressed between the washer 4 and the inner face of the mouth edge section of opening 8, and retaining of cushion body 3 into the molding cavity 7 and sealing of the opening 8 are carried out at a time. The raw material resin is filled in the molding cavity 7 and clamping of nut 9 is released after curing and releasing from the mold is carried out, and a molded body in which the cushion body 3 and the insert B embedded integrally is manufactured.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Field of Application) The present invention provides a method for embedding, for example, stud bolts integrally with synthetic resins, especially fiber-reinforced plastics, and simultaneously burying the stud bolts therein. The present invention relates to a method of molding a synthetic resin molded body having a cushion body integrally attached thereto, in which a ring-shaped cushion body made of sponge or the like is embedded around the body.

(Prior Art) Conventionally, for example, in order to bury a stud bolt in an upright state in a glass fiber reinforced plastic molded body made by a hand lay-up method, a stud bolt 50 is used as shown in FIG. The washer 51 which is in explosive contact with the lower end is placed on the upper surface of the molded body 52, and the covering layer 53 of glass fiber reinforced plastic is placed over the upper surface of the washer 51 and the upper surface of the molded body 52.
was applied using the hand layup method.

When it is desired to assemble this molded body 52 to the frame of a structure or the like as a cushion, a cushion body 54 formed in the shape of an annular plate is fitted onto a single stud bolt 50. .

(Problems to be Solved by the Invention) However, according to the above-mentioned insert burying method, a troublesome method is required to hold the stud bolt 50 accurately vertically on the upper surface of the molded body 52, which is not necessarily a completely flat surface. Moreover, it was extremely inefficient to bury each of the 5 fl stud bolts by hand lay-up method.

Furthermore, when the molded body 52 is assembled to the frame of a structure in a cushioned state, the work of inserting the cushion body 54 into each stud bolt 5g one by one at the assembly site is extremely troublesome.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to embed the insert into a molded body in a simple manner, and also use this embedding process to embed the cushion body in the molded body at the same time. The present invention provides a method for molding an attached synthetic resin molded body.

Of course, the method of the present invention can also be applied to the purpose of burying only the cushion body.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, according to the present invention, a method for molding a synthetic resin molded body having a cushion body integrally attached is as follows: mold A; An opening 8 having an opening area narrower than the planar area of the cushion body 3 is provided in the wall, and a gap between the inner surface of the mouth edge of the opening 8 and the insert B placed in the molding cavity 7 facing the opening 8 is provided. The cushion body 3 is placed in the gap a.
compressing the peripheral part of the cushion body 3 located in the gap a by the fastening means S, filling the molding cavity 1 with raw resin in this state, and curing the raw resin. Afterwards, the fastening by the fastening means 9 is released and the mold is removed.

As the inserter (2) and B, for example, a stud bolt 1 having a washer 4 attached to one end thereof having a planar area larger than the opening area of the opening 1 is used, and the gap a is between the washer 4 and the opening 8. It is preferable that the bolt be formed between the stud bolt 1 and the inner surface of the mouth edge part, and that the other end of the stud bolt 1 be screwed into a portion of the molding cavity 1 that projects outside of the molding cavity 1 as the fastening means.

(Function) The washer 4 portion of the stud bolt 1 with the washer 4 attached to one end, for example, as the insert B is placed in the molding cavity 7, and the annular cushion body 3 made of, for example, sponge is placed on the upper surface of the washer 4. An upper mold having an opening 8 having an opening area narrower than the plane area of the washer 4 is placed on top of the cushion body 3, and the other end of the stud bolt 1 is inserted from the opening into the outside of the molding cavity 7. When a nut 9, for example, is screwed into this protruding portion as a fastening means, the peripheral portion of the cushion body 3 is compressed between the washer 4 and the inner surface of the mouth edge of the opening 8', and the molding cavity is closed. Holding of the cushion body 3 at a predetermined location in the interior 7 and sealing of the opening 3 are performed at once.

Therefore, by filling the molding cavity 7 with raw resin, releasing the fastening of the nut 9 after curing, and removing the mold, a molded body in which the cushion body 3 and the inserter 1-B are embedded integrally can be obtained.

(Embodiment) Referring to FIGS. 1 to 5 below, the present invention will be described in which one end side of a stud bolt 1 as an insert B is embedded in a molded body 2 of glass fiber reinforced plastic, and An embodiment will be explained in which the annular cushion body 3 inserted into the stud bolt 1 is also embedded in the molded body 2 at the same time.

A disk-shaped washer 4 is concentrically blast-welded to the stud bolt 1 at its lower end (in the figure).

In this case, the cushion body 3 is made of polyethylene foam with a closed cell structure, and is formed into a disc shape smaller than the diameter of the washer 4, and has an insertion hole 3 for the stud bolt 1 in the center.
A is provided.

The mold A has a structure in which a molding cavity 7 is formed between a lower mold 5 and an upper mold 6 as shown in FIG. , an opening 8 having a diameter smaller than that of the washer 4 is provided.

9 is a nut which is screwed onto the stud bolt 1 and serves as a fastening means, and 10 is a washer thereof.

Next, the operation of the above configuration will be explained.

First, as shown in Fig. 1, with the upper mold 6 removed, the lower mold 5 is removed.
A glass fiber mat C for reinforcing the molded body 2 is laid on the upper surface of the molded body 2, and the washer 4 portion of the insert B is placed at a predetermined position on the mat C.

Next, the cushion body 3 is inserted into the stud bolt 1, the upper mold 6 is placed over the lower mold 5, and the mold is clamped.

After that, the washer 10 is fitted onto the upper end of the stud bolt 1 that protrudes above the upper mold 6, and when the screw is screwed on and tightened, the washer 4 is attached to the lower mold as shown in FIG. 5 rises from the bottom surface, and the upper surface and opening 8 of the upper mold 6
Cushion body 3 sandwiched in the gap a between the inner surface of the mouth edge of
The periphery of is gradually compressed. When the rotational torque increases beyond this level, it becomes difficult to tighten the nut 9 any further, so the tightening of the nut 9 is stopped.

In this state, the gap a is the cushion body 3 which is strongly compressed.
The annular gap between the inner peripheral surface of the opening 8 and the stud bolt 1 is also sealed by the compressed cushion body 3.

Therefore, raw resin is filled into the molding cavity 7 using a well-known method through the resin injection port, which is not visible in this figure.

During this resin filling, the outer peripheral surface 3b of the tension member 3 (indicated by a broken line in FIG. 2) that comes into contact with the injected resin is pushed by the leading portion of the pressurized resin flow advancing inside the molding cavity 1. and is recessed in an arc shape as shown by the solid line in FIG.

The reason why the resin flow is recessed in this way is that both the upper and lower layers of the resin flow experience contact resistance with the mold wall and are easily cooled by contacting the mold wall, whereas the middle layer has no flow resistance or cooling effect. This is because the flowability is relatively high because it is difficult to catch, and the leading part of the resin flow protrudes in an arc shape.

After the raw resin has hardened, the nut S is unscrewed and removed from the mold, and the cushion body 3, which has been pressed against the upper mold 6 and the washer 10, expands as shown in FIG. 3 due to its restoring force.

However, the portion 3b of the lower part of the outer circumferential surface of the cushion body 3 that comes into contact with the molded body 2 is prevented from coming off, in other words, by the so-called wedging effect exhibited by the above-mentioned arc-shaped protruding portion formed on the molded body 2. , it becomes embedded in the molded body 2.

Further, as is clear from FIG. 3, the peripheral portion of the washer 4 of the insert B is also buried in the molded body 2.

If the panel-shaped molded body 2 completed in this way is, for example, a ceiling material for a vehicle, the cushion body 3 is already integrally attached to the molded body 2. As shown, the work of assembling this molded body 2 to the vehicle body 20 or 21' in a cushioning manner can be carried out extremely efficiently.

In this case, as in the past, one of the stud bolts is
The cumbersome and inefficient work of fitting a cushion body onto a single book is completely unnecessary.

In the above configuration, the material and shape of the cushion body 3 are of course not limited to those described above.

The structure of the fastening means can be changed as appropriate, such as replacing the stud bolt 1 with a nut, and replacing the nut 3 with a bolt as the fastening means.

Furthermore, the molded body 2 may have any three-dimensional shape, and in that case, the insert 1-B can be attached to any location on its outer circumferential surface.

[Effects of the Invention] As is clear from the above explanation, the method for molding a synthetic resin molded body with a cushion body integrally attached according to the present invention is such that the mold wall of the mold has a surface area narrower than that of the cushion body. An opening having an opening area is provided, and a peripheral part of the sponge-like cushion body is interposed in a gap between the inner surface of the mouth edge of the opening and an insert placed in the molding cavity facing the opening, and this peripheral part is , the gap is compressed and sealed by the fastening means, the raw material resin is filled into the molding cavity in this state, and after the raw resin hardens, the fastening by the fastening means is released and removed. It was designed to be molded.

Therefore, especially when the molded body is made of glass fiber-reinforced plastic, there is no need to rely on the conventional extremely complicated hand lay-up method for embedding an insert such as a stud bolt.

Instead, simply place the insert and cushion body inside the molding cavity and then fasten the fastening means.
The work of holding these items in place is now complete,
After that, the desired molded product can be molded simply by filling the molding cavity with the raw resin.

When assembling a molded body with a cushion body embedded in it, for example, into the body of a vehicle, compared to the conventional method of assembling a separate cushion body to the molded body at the assembly site, 9 has an excellent effect of greatly increasing work efficiency.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being an explanatory diagram of the cushion body and insert being placed at predetermined positions in the molding cavity, and Figure 2 being an explanatory diagram of the state in which the cushion body and insert are being placed at predetermined positions in the molding cavity. FIG. 3 is a longitudinal sectional view of the main part of the mold before the body is removed from the mold, FIG. 4 and FIG. FIG. FIG. 6 is an explanatory diagram of a conventional example. Figure 1 Symbols Front stud bolt (insert) Molded body 3 Cushion body insertion hole 3b Outer peripheral surface washer (insert) Lower mold 6 Upper mold molding cavity opening T Nut (fastening means) washer mold B Insert glass fiber mat a, b Gap (B Figure 2 Figure 3

Claims (2)

[Claims] (1) An opening 8 having an opening area narrower than the planar area of the cushion body 3 is provided in the mold wall of the mold A, and the inner surface of the mouth edge of the opening 8 is placed in the molding cavity 7 so as to face the opening 8. The peripheral part of the cushion body 3 is interposed in the gap a between the arranged insert B, the peripheral part of the cushion body 3 located in the gap a is compressed by the fastening means 9, and in this state, the molding is performed. A method for molding a synthetic resin molded body with a cushion body integrally attached thereto, characterized in that the cavity 7 is filled with raw resin, and after the raw resin hardens, the fastening by the fastening means 9 is released and the mold is removed. . (2) The insert B is a stud bolt 1 having a washer 4 attached to one end thereof, the washer 4 having a planar area larger than the opening area of the opening 8, and the gap a is between the washer 4 and the edge of the opening 8. 1 . The fastening means 9 is a nut 9 screwed onto a portion of the stud bolt 1 in which the other end of the stud bolt 1 protrudes to the outside of the molding cavity 1 . A method for molding a synthetic resin molded body integrally attached with a cushion body as described in 2.