JPS606768B2 - Injection mold for deep molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an injection mold from which a deep molded product molded by an injection molding machine can be easily removed.

[Prior art] Conventionally, it has been common practice to remove shaped injection molded products from the mold using a template device that uses ejector pins or air pressure. However, there was a problem in that the stroke of the ejecting pin was large, resulting in an increase in the size of the device.

As a measure to improve this problem, for example,
As described in Publication No. 54, there is a known method in which the molded product is taken out by injecting air between the male mold and a partially modeled molded product by knockout from the tip of the nozzle. Since the mold is raised and lowered by movement as the mold opens and closes, it has the disadvantage that the device becomes complicated and large, and the equipment becomes bulky. [Object of the Invention] The present invention solves the above-mentioned drawbacks and provides an injection mold that can be reliably separated from and taken out from a deep-bottomed molded product.

[Summary of the invention]

In the split surface of the mold of the present invention, which does not constitute a mold surface, an insert is attached to a hole drilled inward from the split surface, and the molded product is damaged by the insert. A mold for injection molding of a deep-bottom molded product is provided with a gas jet hole opening in the exit direction, and the gas jet hole is passed through a compressed gas source outside the mold.

[Structure of the invention]

Next, an example of the injection mold for deep-bottomed molded products of the present invention will be explained with reference to the drawings.

This example shows a mold for molding a deep-bottomed, thick-walled container, and in the figure, 1 is a stationary mold, which is equipped with a nozzle touch 2 and a female mold surface 3.

4 is a movable mold and has a male mold surface 5.

Further, 6 is a dividing surface of the movable mold 4, a hole 7 is provided from the dividing surface 6 toward the outer surface of the mold, and a stepped portion 8 is provided at a location near the outer surface of the mold 7. The diameter of the outer part of the rod part 8 is larger. Reference numeral 9 denotes an insert fitted into the hole 7, and the insert 9 is fitted with iron from the outside of the mold and fixed with a holding plate 10.

Further, the tip end surface of the insert 9 forms a part of the dividing surface 6 of the movable mold 4, but is a portion that does not constitute the mold surface 5.
Therefore, the insert 9 is provided with a gas ejection hole 11, and the gas ejection hole 11 has a small diameter portion 12 whose tip is opened in the most effective direction for extrusion of the injection molded product, and a flannel portion 4. 12 and is bored in the koji direction of the insert 9.
It consists of The gas ejection holes l i are connected to a compressed gas source (not shown) installed outside the mold. Note that 14 is a nipple screwed onto the inlet of the gas jet hole 11.

A method of molding using the injection mold described above will be explained.

As shown in FIG. 1, the fixed side mold and the movable side mold 4 are closed to form a mold 15, and an injection nozzle (not shown) is attached to the nozzle touch 2, followed by an injection cylinder (also not shown). The molten resin is injected through an injection nozzle into the mold bran 15 and cooled to form a molded product 16.

Next, as shown in FIG. 2, while opening the mold, the molded product 16 is slightly released by a pneumatic template device (not shown) provided in the movable mold 4, and then the gas injection holes are released. 1
Compressed gas is ejected from 1 to the rear of the molded product 6 and press-fitted into the gap created between the molded product 16 and the male mold surface 5, thereby moving the molded product 16 into the movable mold 4. This will ensure that they leave. In the device of the present invention, the insert 9 extends from the outer surface of the mold to the dividing surface 6 of the mold as in the above embodiment.
In addition to being provided in a hole 7 shallowly drilled inward from the dividing surface 6 of the mold, the gas injection hole 11 may be connected to a compressed gas source outside the mold. In order to urge
The lotus hole is directly drilled into the mold.

Also, the diameter of the gas outlet provided in the insert depends on the shape of the molded product,
Although it can be set arbitrarily depending on the size, weight, etc., it is usually about 1 to 5 wear, and the tip is preferably closed in the direction most effective for removing the molded product. Also, “Gas outlet 1
A plurality of inserts 1 may be provided in the same insert if necessary, and the number of inserts is not limited, such as providing a plurality of inserts at symmetrical positions in the mold. Further, the material of the insert does not necessarily have to be the same as the material constituting the mold, and any soft material that is easy to perforate, such as gunmetal or European steel, may be selected as appropriate. The gas ejection holes in the present invention must be provided on the mold parting surface, and if they were provided on the mold parting surface as in the conventional mold release device, the molten resin would enter and the purpose could not be achieved. do not have. In addition, the timing of the jetting of compressed gas from the gas jetting holes is set appropriately in conjunction with the injection molding cycle, and the mold is usually split open, and the molded product is slightly released by a conventional mold release device, and the mold is separated from the mold. It is preferable to perform this after a slight gap has been created between the molded product, but depending on conditions such as accelerating the injection molding cycle,
Compressed gas may be ejected from the gas ejection hole simultaneously with the operation of a conventional mold release device.

〔Effect of the invention〕

In the device of the present invention, an insert is placed in a hole drilled inward from the dividing surface in a part of the mold that does not constitute the mold surface, and the insert is placed in the insert in the direction in which the molded product is taken out. Since the structure is equipped with a gas ejection hole that opens into the □, its purpose can be achieved by modifying conventional equipment.The equipment does not need to be enlarged, making it possible to reduce equipment costs and save space. .

Further, it is easy to make the gas ejection holes, and it is convenient because gas ejection holes with different directions and numbers can be attached to the same mold by simply replacing the insert.

[Brief explanation of drawings]

Figures 1 and 2 are partially cutaway vertical cross-sectional views showing an example of an injection mold for deep-molded products of the present invention. 2 shows a state in which the mold is being opened and the injection molded product is slightly molded, and FIG. 3 is an enlarged sectional view showing the insert provided with gas injection holes. 1...Fixed side mold, 4...Moving side mold 6...
...Dividing surface of moving side mold, 9... Insert, 11
...Gas outlet, 15...Mold dealer, 16...Injection molded product. Talent! Diagram na 2 Diagram 3 Diagram

Claims (1)

[Claims] 1. In the part of the mold that does not constitute the mold surface, an insert is fitted into a hole drilled inward from the dividing surface, and the insert is opened in the direction of taking out the molded product. 1. A mold for injection molding a deep-bottomed product, characterized in that a gas jet hole is provided, and the gas jet hole is communicated with a compressed gas source outside the mold.