JPS62152711A - Manufacture of resin molded part with a plurality of inserts - Google Patents

Abstract

PURPOSE:To simplify a feeding device by a method wherein a resin molded part with a plurality of inserts is molded from a single material in continuous form. CONSTITUTION:On a material 9 in continuous form, a first insert 1 and a second insert 2 are molded in advance in the alternately repeated manner so as to be disposed in an array. A first resin molded part 31 after molding is left in a bottom force 17 under the state that the first insert 1 is cut off from the material 9 in continuous form. After that, by opening molds, the material 9 in continuous form is shifted to a position at which the second insert 2 coincides with the position of the first resin molded part 31, and at the same time a top force cavity 10 is replaced with a first cavity 11. A second resin molded part 32, which is obtained by another molding, is ejected with ejector pins 19 in order to be carried outside the molds. Thus, a process of forming insert shapes on the material in continuous form is shortened and, in addition, facilities for molding resin are simplified.

Description

Detailed Description of the Invention A. Object of the Invention [Field of Industrial Application] The present invention is directed to the production of a resin molded product having a plurality of inserts 2 in one resin molded product 3, for example, as shown in FIG. Regarding the method.

[Conventional technology]

Conventionally, in order to mold a plurality of inserts into one resin molded product, each type of insert is formed into a separate elongated material, and the elongated materials are sequentially supplied.

[Problem that the invention seeks to solve]

Therefore, a plurality of long material supply devices are required, which makes the equipment complicated. In addition, since resin molding is performed with several long pieces of material in close proximity, not only are there greater restrictions on the shape of the parts, but
When the inserts are bent, there are various problems such as the inserts interfering with each other in places other than molding.

The present invention aims to solve these problems.

σ1 Structure of the Invention [Means for Solving the Problems] In the present invention, when molding a plurality of inserts into one resin molded product, the inserts to be molded are sequentially molded onto one long piece of wood in advance. The elongated material is repeatedly arranged in a row, and the elongated material is fed into a resin molding die. First, the first insert is resin-molded and cut from the elongated material to form an intermediate molded product. The process of feeding the long material one pitch with the molded product remaining in the mold, stacking the next insert on top of the intermediate molded product, and then exchanging at least part of the cavity and performing resin molding again is the i number of inserts. This is a method for producing a resin molded product having a plurality of inserts, characterized in that the final molded product is obtained by repeating the process according to the method.

[For production]

This is because there is only one elongated member for forming the insert.

The feeding device is simplified.

〔Example〕

3 to 5 are explanatory diagrams of the method of the present invention for molding the electrical contact component illustrated in FIG. 1.

In Figure 1, 1 is the first insert, 2 is the second insert, 3
is a completed molded product. Figure 2 shows the intermediate molded product, and 31 is the first part.
A molded product, 4 is a stepped portion of the first molded product 31, 5 is a notch portion of the first molded product 31, 6 is a hole in the molded product, and 32 is formed on the first molded product 31 by the second molding. In the second molded part,
Product 3 is obtained by the above 75t second molding.

Reference numeral 9 in FIG. 3 indicates that a long material is formed in advance so that first inserts and second inserts 2 are alternately arranged. However, in Fig. 3, the inserts are shown symbolically to simplify the explanation, IO is the second cavity, 11 is the first cavity, 1
2 is a resin mold, 13 is a cylinder that serves as a driving source for replacing the cavity, 14 is a template slide part, and 15 in Figures 4 and 5.
1 is an upper mold plate, 17 is a lower mold plate, 16 is a cylinder fixing member, 1
8 is a second molded product gate part, 19 is an ejector turbine, 2
0 is a relief for the first cavity, 21 is a first molded product gate part, 22 is a cylinder rod, and 23 is a runner common part.

FIG. 4 shows the molding process of the first molded product 31, in which the elongated material 9
is supplied into the resin mold 12 by a feeding device (not shown), and at this time, the first insert l is inserted into the first cavity 1.
1, resin molding is performed there, and the first molded product 31 shown in FIG. 2 is obtained. At this time, the first insert l is separated from the elongated material 9 due to mold clamping force or the like and remains in the cavity Ila of the lower mold 17.

Next, the mold is opened, and the elongated material 9 is fed until the second insert 2 is in the position of the first molded product 31, and at the same time the cylinder 13 is
As a result, the mold plate slide part 14 is moved by the cylinder 13, and the upper mold cavity 10 is replaced with the first cavity 11.
It will be in the state shown in the figure.

In addition, by replacing the cavity, the gate is also replaced from 21 to 18.

Then, resin molding is performed again to obtain the second molded product 32. The second molded product 32 remains connected to the long material 9, is ejected by the ejector turbine 19, is transported out of the mold by feeding the long material 9 as shown in FIG. 9 to obtain a product as an electrical contact part shown in FIG.

Hole 6 in the molded product is a positioning hole when assembling the product into equipment, and at the same time, by placing a pin from the lower mold cavity and molding this hole, it is easy to insert into the upper mold when opening the mold. This is to prevent this. Further, the cutout portion 5 of the first molded product 31 improves the adhesion with the second molded product 32, and the step portion 4 of the first molded product 31 is used to improve the adhesion with the second molded product 32. , to prevent the second insert 2 from shifting due to resin pressure.

Next, in the case of one resin molded product having three or more types of inserts, for example, each insert shape is repeatedly arranged in sequence on one long material, and three or more types of inserts are formed.
By preparing different types of cavities, molding can be performed in the same manner as above.

In addition, when molding a more complicated resin shape, it is possible to replace not only the upper mold cavity as in the example described above, but also replace both the upper and lower cavities. However, if the insert is to be formed on a short piece of material, it is best to keep the cavity fixed and move the short piece in a direction perpendicular to the feed direction. It is also conceivable to mold it by At this time, it is also necessary to replace the gate at the same time.

Figure 6 shows two long pieces of lumber 9, which are the same as those used for single-piece cutting, arranged one above the other.
An example of molding multiple pieces using one mold, Figure 7 shows an example of molding two pieces from one long piece of wood.In this case, the feed pitch of the long piece is 1 pitch, 3 pitches, or 1 pitch This is done by alternating changes like a three-pitch match. Also the 8th
The figure shows an example in which insert shapes are formed in two rows in advance on one long material and two pieces are taken out.

C. As described in detail of the invention, a resin molded product having a plurality of inserts is molded using one long material.

The process of forming an insert shape on a long material is shortened, the equipment for resin molding is also simplified, the time required for thread removal is shortened, and changes in the number of types of inserts can be easily accommodated.

In addition, since two long pieces of material are not molded in close proximity, the shape of the molded product can be relatively freely formed.
Furthermore, even if the inserts are bent, the inserts do not interfere with each other, improving workability and providing a highly reliable product.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a product produced by the method of the present invention;
Figure 2 is a perspective view of the intermediate molded product, Figure 3 is a schematic plan view explaining the process of the method of the present invention, Figures 4 and 5 are cross-sectional views of the mold showing the molding process, and Figures 6 to 8. The figure is a schematic plan view showing the process in case of multi-piece molding. 1 is the first insert, 2 is the second insert, 3 is the molded product, 31 is the resin part formed by the first molding, 32 is the resin part formed by the second molding, 4 is the stepped part, and 5 is the notch. , 6 is a hole of the molded product, 9 is a long material, 10 is a second cavity, 11 is a first cavity, 12 is a resin mold,
13 is a cylinder, 14 is a mold plate slide part, 15 is an upper mold plate, 17 is a lower mold plate, 18 is a second molded product gate part, 19 is an ejector turbine, 21 is a first molded product gate part, and 23 is a runner common Department. Figure 8 Figure 6 Figure 7

Claims (1)

[Claims] (1) When molding multiple inserts into one resin molded product, the inserts to be molded are formed in advance in a repeating arrangement on one long material, and then is supplied to a resin mold, the first insert is resin molded, and cut from a long material to form an intermediate molded product.
With this intermediate molded product remaining in the mold, the long material is fed one pitch, the next insert is overlapped with the intermediate molded product, and at least a part of the cavity is replaced and resin molding is performed again. A method for manufacturing a resin molded product having a plurality of inserts, characterized in that the final molded product is obtained by repeating the process according to the number of inserts.