JPH036406Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a mold for forming resin products.

<Conventional technology> In conventional R-RIM molding of resin molding molds, resin is injected into the product molding cavity through a runner from a mixing head, and in injection molding, resin is injected into the product molding cavity through a spool bush. In compression molding, a resin material is placed on a lower mold and the upper mold is lowered to perform press molding.

<Problems to be solved by the invention> In the above conventional method, it is necessary to separately manufacture molds for R-RIM, injection molding, and compression molding, which increases mold manufacturing costs and shortens the manufacturing period. I had a problem with it being long.

<Means for solving the problems> In order to solve the above-mentioned conventional problems, the present invention enables three different types of resin molding with one mold, and its configuration is as follows. It consists of a combined mold and a lower mold, and the combination of the upper and lower molds creates a molding cavity for the product, a runner that leads to this molding cavity, a mixing head that injects resin into this runner, and a mixing head that injects resin from the injection molding machine. a spool bushing insertion hole provided in the upper mold for injection into the molding gap; a first partial insert that closes the replaceable spool bushing insertion hole in the passage of the runner and opens the runner passage; and a second partial insert that allows the spool bushing to be inserted into the spool bushing insertion hole and closes the runner passage, and a third partial insert that closes the spool bushing insertion hole and the runner passage. It is something that exists.

<Function> The present invention is capable of molding three different types of resin with one mold by alternately arranging three types of partial inserts with different structures in the runner passage.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, 1 is an upper mold, and 2 is a lower mold. The upper mold 1 and the lower mold 2 are combined molds, and when combined, they form a molding cavity 3 for the product, a runner 5 that communicates with this molding cavity 3, a mixing head 6 that injects resin into this runner 5, and an injection molding It has a spool bushing insertion hole 7 provided in the upper mold 1 for injecting resin from the molding machine into the molding gap.
Reference numeral 4 denotes a mold temperature adjustment hole provided near the molding gap 3.

In the passage of the runner 5, partial inserts having different configurations as described below are replaceably installed. That is, as shown in FIG. 1, first partial inserts 8 and 9 close the spool bush insertion hole 7 and open the passage of the runner 5, and as shown in FIG. Second part inserts 8a, 9a (in this case, the lower die 2
The partial insert 9a is used in common with the partial insert 9 of the lower die 2 of the first partial insert. ), as shown in Figure 3, the spool bush insertion hole 7 and the runner 5.
third partial inserts 8b, 9b that close both passages of
This is due to the following.

Since the present invention has the configuration as described above, the above 1.
Three different types of resin molding are performed for the upper and lower molds 1 and 2 by replacing the first to third partial inserts 8, 9, 8a, 9a, 8b, and 9b.

That is, in the case of the first partial inserts 8 and 9 shown in FIG. 1, R-RIM molding is performed by injecting resin from the mixing head 6. Further, in the case shown in FIG. 2, by replacing only the partial insert 8a of the upper mold 1, the resin from the injection molding machine is guided through the spool bush 11, and injection molding is performed. Furthermore, in the case shown in FIG. 3, the upper mold 1 is opened, a resin material is placed on the molding cavity 3 of the lower mold 2, and the upper mold 1 is closed, whereby the resin material is press-molded based on the molding cavity 3. It is.

In addition, the mold temperature adjustment hole 4 is provided as shown in FIGS.
Cooling is performed during R-RIM molding and injection molding as shown in the figure.
Heat is applied during compression molding as shown in FIG. In this case, the cooling medium and heating medium are supplied by connecting them to the hose insertion port with a quick joint so as to correspond to each molding method.

<Effects of the invention> As described above, according to the invention, it is possible to mold several different types of resin with one mold by simply replacing the partial inserts of the structure corresponding to each molding method in the runner passage. This has the effect of reducing mold costs and significantly shortening the manufacturing period.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are cross-sectional views showing different states of resin molding using the same mold. 1... Upper mold, 2... Lower mold, 3... Molding gap, 5
...Runner, 6...Mixing head, 7...
Spool bush insertion hole, 8, 9...First part insert, 8a, 9a...Second part insert, 8b, 9b...
...Third part nest.

Claims (1)

[Scope of utility model registration request] It consists of an upper mold and a lower mold that combine to create a molding cavity for the product, a runner that communicates with this molding cavity, a mixing head that injects resin into this runner, and a resin from the injection molding machine. a spool bushing insertion hole provided in the upper mold for injecting the spool bushing into the molding cavity, and a first part that closes the spool bushing insertion hole and opens the runner passage, the spool bushing being replaceable in the passage of the runner. a second part insert that allows the spool bush to be inserted into the spool bush insertion hole and closes the runner passage, and a third part insert that closes the spool bush insertion hole and the runner passage. A resin mold that is characterized by: