JPS63188017A - Multi-injection molding machine - Google Patents

Abstract

PURPOSE:To enable securing of an accurate relative positional relation between a primary molded product and a secondary insert quite easily and automatically, by a method wherein a profiling space and an auxiliary profiling space for molding of a support member of the insert are formed within a primary mold, and at the time of mold clamping a side pin is inserted into the auxiliary profiling space. CONSTITUTION:A loose block 10 is moved forward, fitted into a bottom force 7b, and then the top and bottom forces 7a, 7b are clamped, in a station B. In this instance, a support pin 11 is inserted into a profiling space 7c for primary molding, and a side pin 12 is inserted into an auxiliary profiling space 7d. When primary injection molding is performed, a primary molded product 2 which is composed of a buried primary insert 3 is molded. Simultaneously with this, a secondary insert support member 13 is molded through the auxiliary profiling space 7d by extending astride of a space between a pair of side pins 12, 12. At this time, a connecting part 14 of the secondary insert is formed so that a predetermined relative positional relation with the primary molded product 2 is secured. Then a machine screw 5 is set and held on the connecting part 14 of the secondary insert, in a station C. In addition, the loose block 10 is fitted in a mold 8 and secondary injection molding is performed by inserting the machine screw 5 into a profiling space 8c of the secondary molding mold 8, in a station D.

Description

[Detailed Description of the Invention] <Industrial Application Field> This article 1 relates to an injection molding machine for synthetic resin materials, etc., and is particularly concerned with multiple injection molding machines that perform molding operations several times to obtain one molded product. It is related to molding machines.

<Prior Art> Conventionally, as shown in FIG. 1, a primary molded product 2 including a nut 3 is integrally molded, and a secondary molded product 4 is integrally molded including the secondary molded product 2 and a screw 5. When molding a multi-molded product l such as a universal joint consisting of Primary injection molding is performed, this secondary molded product is taken out and inserted into a secondary mold, and after inserting screws 5 as secondary inserts, secondary injection molding is performed in the secondary mold. A multi-injection molding machine such as this is generally used.

<Problems to be Solved by the Invention> In the above-mentioned prior art, the secondary molded product and the secondary insert are each inserted into the secondary molding mold separately, so it is difficult to accurately determine their mutual positional relationship. The work of holding and inserting the wire is difficult and complicated, and when such work is performed using an industrial robot, there is a problem that the entire device becomes large and complicated.

Means for Solving the Problems The present invention solves problems such as irregularities in the mutual positions of the primary molded product and the secondary insert and the complexity of the insertion work due to the structural limitations of the multiple injection molding machine based on the above-mentioned prior art. In view of the problem, we installed a primary insert support pin and a secondary insert support in a loose block that can move forward and backward relative to the primary mold and secondary mold placed along the movable table to engage and disengage. A side pin for holding the member is provided in a protruding manner, and the blow molding mold includes, in addition to the molding space for primary molding, a sub-mold extending to the side pin for molding the secondary insert support member. The above-mentioned problem is attempted to be solved by forming a carved space.

Function> The structure of the present invention is as follows: - During blow molding, a primary insert is attached to a primary insert support bin of a loose block, and this is inserted into a primary molding cavity of a primary molding die; The side pins of the loose block are inserted into the sub-die molding space, and secondary injection molding is performed here to form a primary molded product in which the secondary insert is integrally molded, and the secondary insert support member is inserted into the side The secondary insert is molded in a state where it extends to the pin, and then the secondary insert is supported by the secondary insert support member, and this is inserted into the secondary molding mold integrally with the next molded product. , here, secondary injection molding is performed so that a secondary molded product is molded in which the relative positional relationship between the secondary molded product and the secondary insert is accurately maintained. be.

<Example> Next, an example of the present invention will be described below based on the drawings from FIG. 2 onwards.

As shown in FIG. 2, along the outer circumference of the rotary table 6, a primary insert insertion station A, a secondary molding station B, a secondary insert insertion station C, and a secondary molding station D are arranged at intervals of 90° in that order. The secondary molding station B and the secondary molding station D are provided with a blowing mold 7 and a secondary molding mold 8, respectively. As shown in FIG. 3, the blow molding mold 7 consists of upper and lower molds 7a and 7b, inside of which a mold-engraving space 7c for primary molding is formed, and an arrow A-A in FIG. As shown in FIG. 4, which is a perspective view, a sub-die-carving space 7d for molding the secondary insert support member is formed. On the other hand, on the rotary table 6, a loose block 1 is supported by a cylinder 9 so as to be able to move forward and backward.
The loose block 10 is provided with a secondary insert supporting bin 11 protruding from the loose block 10, and a secondary insert supporting bin 11 is provided on both sides of the loose block 10. A pair of side pins 12 12 for holding the support member are respectively provided to protrude parallel to the support pin 11 . As shown in FIG. 5, which is a view taken along the line B-B in FIG.
When the mold 7 is clamped, the secondary insert support pins 11 reach the primary molding cavity 7c, and the side pins 12 reach the secondary molding space 7c.
It extends to reach d.

In the above configuration, in the primary insert insertion station A shown in FIG. 2, the primary insert support pin 11 of the loose block 10 is
A nut 3, which is a primary insert, is loaded into the tip 11a of the nut 3. Next, rotate the rotary table 6 by 90",
Loose block 10 is placed in the next forming station B, and the loose block IO is moved forward as shown in FIGS. 3 to 5. :! After fitting it into 7b,
The upper and lower molds 7a and 7b are clamped. At this time, the support pin 11 is inserted into the secondary molding space 7c, and the side pin 12 is inserted into the auxiliary molding space 7d. Here, the sixth
As shown in the figure, when the secondary injection molding is performed, a primary molded product 2 in which the secondary insert 3 is embedded is molded. At the same time, as shown in Fig. 7.8, the secondary insert support member 13 is formed so as to extend across the pair of side pins 12, 12 using the sub-die-carving space 7d. . The secondary insert support member 13 is held by connecting its both ends to side pins 12.12, and the secondary insert support member 13 is held so as to maintain a predetermined relative positional relationship with the next molded product 2. Next, as shown in FIG. 9, the upper and lower molds 7a, ? After opening the mold b, the loose block 10 is moved back and the mold 7 is opened.
The second molded product 2 and the secondary insert support member 13 are separated from the support pins 1! Then, the rotary table 6 is rotated 90@ to position the loose block 10 at the secondary insert insertion station C. Here, as shown in FIG. 1O, the screw 5, which is the secondary insert, is loaded and held in the locking portion 14 of the secondary insert support member 13.

The rotary table 6 is rotated once again by 90 degrees to position the loose block 10 at the secondary molding station D, where the block IO is fitted into the mold 8 as shown in FIG. , - Insert the secondary molded product 2 and the secondary insert 5 supported by the secondary insert support member 13 into the secondary molding cavity 8C of the secondary molding die 8 to perform secondary injection molding. Then, as shown in FIGS. 11 and 12 (E-E arrow view in FIG. 11), the secondary molded product 2 and the secondary molded product 4 into which the secondary insert 5 is inserted are molded. Ru.

Finally, after opening the mold 8, the loose block 10 is moved back and removed, and the secondary molded product 2 is pulled out from the primary insert support pin 11, and the secondary insert support member 13 is pulled out from the side pin 12. As a result, the molded product 1 is taken out, and the excess portion of the secondary insert support member 13 protruding from the secondary molded product 4 is cut and removed, so that the molded product 1 as shown in FIG. −
A molded product 1 is obtained in which the primary molded product 2 into which the secondary insert 3 is inserted and the secondary molded product 4 into which the secondary insert 5 is inserted are combined.

In the above embodiment, the work station including the molding die 7.8 is arranged along the outer periphery of the rotary table 6, but the loose block can be moved relatively between a plurality of work stations. This may be arranged along the outer edge of a movable table such as a reciprocating table, or a semicircular recess may be carved as the locking portion 14 of the secondary insert support member 13. Although shown in the figure, it may be of any other shape, such as a hole, as long as it is suitable for locking and supporting the secondary insert 5 depending on its cross-sectional shape. Of course, this is true.

Effect> As described above, according to the present invention, the primary insert is inserted into the loose block that can be fitted and removed by moving forward and backward relative to the primary molding die and the secondary molding die arranged along the movable table. An object support pin and a side pin are provided in a protruding manner, - In addition to the primary molding molding space, a secondary molding space for molding the secondary insert object supporting member is formed in the blow molding mold, and the side pin is inserted into the mold when the mold is clamped. By having the structure inserted into the sub die-sinking space, during the primary molding operation performed by inserting the next insert, the second insert is held by the side pin together with the primary molded product supported by the next insert support pin. Since the secondary insert supporting member is also molded at the same time, the secondary insert is simply supported by the secondary insert supporting member prior to the subsequent secondary molding operation, and the process can be performed very easily and automatically. An excellent effect is achieved in that an accurate relative positional relationship between the primary molded product and the secondary insert is ensured.

Moreover, - no special equipment such as a robot is required to obtain an accurate relative positional relationship between the secondary molded product and the secondary insert, and - blow molding is used to ensure the relative positional relationship. Since the secondary insert support member as an auxiliary member is obtained in the auxiliary mold carving space in the same mold during the primary molding operation, the entire device does not become larger or more complicated.
Another advantage is that it can significantly reduce equipment costs.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a multi-layer molded product, Fig. 2 and the following are examples of the present invention, Fig. 2 is a plan view, and Fig. 3 is a cross-sectional view of the multi-layer molded product.
x sectional view, FIG. 4 is a view taken along the line A-A in FIG. 3, FIG. - C arrow view, Figure 8 is a D-D arrow view of Figure 7, Figure 9
, 10.11 is an operation explanatory diagram, and Fig. 12 is E in Fig. 11.
-E arrow view. l...Multiple molded product 2...-Next molded product 3...
・L-order insert (nut) 4...Secondary molded product 5...Secondary insert (screw) 6...Rotary table (moving table) 7...-Blow molding mold 7c...・Die-carving space 7d for primary molding... Sub-mold half space 8 for molding the secondary insert support member... Secondary mold 10... Loose block 11...-Next insert support pin 12・・・Side pin

Claims (1)

[Scope of Claims] A primary molding die 7 and a secondary molding die 8 arranged along a moving table 6; The primary molding die 7 has a molding space 7c for primary molding as well as a sub molding space 7d for molding the secondary insert support member 13, The loose block 10 includes:
A multiple injection molding machine characterized in that a primary insert support pin 11 that reaches up to the die-sinking space 7c for primary molding and a side pin 12 that extends as far as the sub-die-sinking space 7d are provided in a protruding manner during forward fitting. .