JPS6110969Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a device for releasing a molded product formed in a mold, especially a bellows-shaped boot, from the mold in a molding method such as an injection molding machine. be.

Conventionally, the molding method for molded products with hollow parts such as bellows-shaped boots generally involves filling synthetic rubber or the like into a cavity formed between an outer mold 1 and an inner mold 2, as shown in FIG. It is filled and shaped using an injection molding machine or the like. As a method for releasing the molded product 6, as shown in FIG. The molded product 6 is brought into contact with the bottom of the U-shaped bottomed cylindrical portion 7, and at the same time, fluid such as air is ejected from the spout formed after the ejector rod 5 moves, and the molded product 6 is ejected. The molded product 6 is released from the surface of the middle mold 2 by the action of pressurizing fluid between the inner mold 2 and the surface of the inner mold 2 to which the molded product is attached.

However, in such a conventional mold release method, the mold structure is complicated because the bottomed cylindrical part 7 is provided at the end of the molded product 6 that comes into contact with the protruding rod 5, and after mold release, the bottomed cylindrical part Since 7 is no longer needed, a step is required to remove it, and additionally, the part is filled with extra material, which is extremely uneconomical.

The object of the present invention is to provide a mold release device for molded products that eliminates such conventional drawbacks.

An embodiment of the present invention is shown in FIG. An outer mold 1, an inner mold 2, and a protruding rod 5 forming a part of the inner mold 2
Synthetic rubber or the like is filled and shaped using an injection molding machine or the like into the cavity formed between the protruding portion 4 provided in the cylindrical body. As shown in FIG. 2, a part of the middle mold 2 is a protrusion rod having a protrusion 4 that comes into contact with a wall on the side in the protrusion direction of the molded product 6 (on the left side in the drawing), and in the embodiment, a first wall 31. 5. The molded product 6 is released from the mold first by the second step.
The mold is opened from the mold closed state shown in the figure, and then the ejecting rod 5 provided in the middle mold 2 is moved to the ejecting direction side of the molded product 6 (left side in the drawing). While jetting fluid such as air onto the inner circumferential surface of the molded product 6 from the jet port formed between the shaped portion 4 and the middle mold 2, the protrusion 4 is inserted into the first molded product 6. The molded product 6 is brought into contact with the wall portion 31
is projected and released from the surface of the middle mold 2.

In addition, in the embodiment, the protruding portion 4 of the protruding rod 5
Although the part that comes into contact with is provided on the first wall part 31 on the protruding direction side of the molded product 6, the present invention is not limited to this, and depending on the second wall part 32 and the shape of the boot, other parts may be provided. It may be provided on the wall.

As described above, the mold release device of the present invention is different from the conventional mold release device by bringing the protrusion provided on the ejection rod forming a part of the inner mold into contact with any part of the molded product in the ejection direction and releasing the mold. By eliminating the need for the bottomed cylindrical part that was required for mold release, materials can be saved, and the process of removing the bottomed cylindrical part can be reduced.
This simplifies mold production.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional mold release device for molded products, and FIG. 2 is a sectional view of the mold release device of the present invention. DESCRIPTION OF SYMBOLS 1...Outer mold, 2...Middle mold, 31...First wall part, 32...Second wall part, 4...Protrusion part, 5...Protrusion rod, 6...Molded product.

Claims (1)

[Scope of utility model registration request] In a mold release device for a molded product, which includes an outer mold and an inner mold, and has a mechanism for ejecting and ejecting fluid for releasing the molded product in the inner mold, a wall portion on the side in the direction in which the molded product is ejected. A part of the middle mold is formed by a protruding rod having a protrusion that comes into contact with the mold, and after the mold is opened, fluid is ejected between the middle mold and the molded product, and the protrusion causes the molded product to be A mold release device for a molded product, characterized in that it releases the mold by protruding it.