JPH059136Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an injection mold that allows easy removal of residual resin in a molten resin channel.

[Conventional technology]

For example, when molding cases with many different colors, such as floppy discs, there would be no problem if a dedicated mold could be prepared for each color, but having such a large number of dedicated molds There are many problems in terms of cost and management.

Therefore, conventionally, one mold is used to mold products of a plurality of colors (for example, three to four colors). In this case, after a product of one color is finished, it is necessary to remove the resin remaining in the mold before molding a product of the next color.

[Problem that the invention attempts to solve]

By the way, in the above-mentioned conventional injection mold, a bush is provided passing through a plurality of mold plates,
When a torpedo is inserted into this bush and a molten resin passage is formed between the bush and the torpedo, it is difficult to completely remove the resin remaining in this molten resin passage, and There was a problem in that the resin removal work was time-consuming.

This invention was made in view of the above circumstances,
The purpose is to provide an injection mold that can easily remove the resin remaining in the molten resin passage in the bush and that can respond flexibly and quickly to changes in the color of the resin used, etc. .

[Means for solving problems]

In order to achieve the above object, the present invention provides a bushing provided on a mold plate in a state where the bushing surrounds a molten resin passage penetrating the mold plate, the bushing being configured to be separable into a plurality of bushing bodies, and the bushing body is provided with:
An engaging portion is provided which engages with the solidified resin in the molten resin passage.

[Effect]

In the injection mold of the present invention, the solidified resin in the bush is pulled out by engaging the locking portion of the divided bush body, thereby removing the resin remaining in the molten resin passage. Remove smoothly.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a fixed mold plate, and this fixed mold plate 1 is attached to a fixed mounting plate 5 via first and second fixed receiving plates 2, 3 and a spacer block 4. As shown in FIG. Further, a movable mold plate 6 is movably provided opposite to the fixed mold plate 1, and this movable mold plate 6 is attached to a movable mounting plate 9 via a movable receiving plate 7 and a spacer block 8. . and,
Engraved surfaces for forming the outer surface and inner surface of a half case (molded product) for the floppy disk 7 are formed on each opposing surface of these templates 1 and 6, respectively.

A locate ring 10 is mounted on the fixed mounting plate 5, and a sprue bush 11 is inserted through the fixed mounting plate 5. A manifold 12 is connected to this sprue bush 11, and to this manifold 12, a torpedo 13 is provided passing through the second and first fixed receiving plates 3, 2 and the fixed mold plate 1. The proximal ends of are connected. Further, around this torpedo 13, a bush 14 is arranged from the second fixed receiving plate 3 to the fixed mold plate 1. And the sprue bush 11, manifold 12 and torpedo 13
A molten resin passage 15 is formed through the base end of the mold plate 1, the bush 14, and the inside of the fixed mold plate 1. In addition,
Reference numeral 16 in the figure is an ejecting device for ejecting the molded product.

In the manifold 12, a first manifold body 17 in the form of a plate supported by the fixed mounting plate 5 and a second manifold body 18 in the form of a plate supported by the second fixed receiving plate 3 are joined together by fastening bolts 19. This is what is being done. And the above manifold 1
The molten resin passage 15 in the second manifold body 17 includes a through hole 20 that is formed in the first manifold body 17 and communicates with the inside of the sprue bush 11, and this through hole 20.
A circulation groove 21 that communicates with the first manifold body 17 and is formed on the joint surface of the second manifold body 18, and a circulation groove 22 that is formed in the second manifold body 18 opposite to this circulation groove 21. , and an insertion hole 23 formed in the second manifold body 18 from the circulation groove 22 to the base end side of the torpedo 13. Further, the insertion hole 23 formed in the second manifold body 18 is connected to the circulation groove 22.
The diameter of the torpedo 13 is reduced toward the proximal end of the torpedo 13. Furthermore, wiring 24 such as a heater for heating the inside of the manifold 12 is arranged in a concentrated manner in the first manifold body 17.

The bushing 14 also includes a first bushing body 25 mounted on the first fixed receiving plate 2 and the fixed mold plate 1, and a second bushing body 25 mounted on the second fixed receiving plate 3, as shown in FIG. The body 26 is divided into two parts. A protrusion (locking part) 27 that protrudes inward (into the molten resin path) is formed at the base end of the first bushing body 25. The end portion and the first fixed receiving plate 2 are engaged with each other, and the first bushing body 25 is connected to the first fixed receiving plate 2.
It is constructed so that it will not fall off.

In the injection mold configured as described above, after the mold is closed, molten resin is supplied from one end of the sprue bush 11 through the molten resin passage 15 into the cavity 29 to mold the molded product. do. After manufacturing a molded product in one color, when molding a molded product in the next color, the mold is separated while attached to the molding machine, and the first and second fixed receivers are separated. By opening the space between the plates 2 and 3, the resin solidified around the torpedo 13 is
It engages with the projection 27 of the bushing body 25 and separates from around the torpedo 13 together with the first fixed receiving plate 2 (first bushing body 25). In this case, by warming the base of the torpedo 13, the solidified resin 28 can be drawn out smoothly from the base of the torpedo 13 and the inside of the second bushing body 26. The solidified resin adhered to the inside of the first bushing body 25 and the fixed mold plate 1 is hollow by the amount of the torpedo 13 that has come out, so the solidified resin can be squeezed inward and pulled out. , it can be easily taken out from inside the first bushing body 25 and the fixed mold plate 1.

In this way, the solidified resin around the torpedo 13 was removed, and by dividing the manifold 12, the solidified resin inside the manifold 12 was removed, and the solidified resin inside the molten resin passage 15 was completely removed. Afterwards, the mold is reassembled and production of molded products using the next colored resin begins.

[Effect of idea]

As explained above, in the present invention, the bush provided on the template in a state surrounding the molten resin passage passing through the plurality of templates can be divided into a plurality of bush bodies. Since the inner periphery is provided with a locking part that engages with the solidified resin in the molten resin passage, the solidified resin in the bush can be pulled out by engaging with the locking part of the divided bush body. This method has excellent effects in that the resin remaining in the molten resin channel can be easily removed, and changes in the color of the resin used can be flexibly and quickly accommodated.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a sectional view and FIG. 2 being a sectional view of a torpedo portion. 1...Fixed template plate, 2...First fixed receiving plate, 3...
Second fixed receiving plate, 14... Bush, 15... Molten resin passage, 25... First bushing body, 26... Second bushing body, 27... Protrusion (locking part), 28
...Solidified resin.

Claims (1)

[Scope of utility model registration request] A bush provided on the template so as to surround the molten resin passages penetrating through the plurality of templates is configured to be divisible into a plurality of bush bodies, and the inner periphery of the bush body includes the molten resin passages in the molten resin passages. An injection mold characterized by being provided with a locking portion that engages with solidified resin.