an injection mold

Abstract

The invention relates to the technical field of injection molds, and discloses an injection mold, which includes a hydraulic device, a hydraulic rod movable mold and a fixed mold, and the hydraulic device and the movable mold are connected through a hydraulic rod to form a The mold cavity is equipped with a cooling water channel, and the middle part of the fixed mold is provided with a pouring port. The pouring port is connected with the cavity and the pouring port is connected with the injection molding machine. The action of the iron drives the seal to move down, so that a gradual negative pressure is formed between the seal and the movable mold. The gradual negative pressure acts on the injection molded part, which can ensure that the outer wall of the injection molded part and the inner wall of the fixed mold They can be slowly separated from each other, so that the bonding resistance between them disappears, and they are separated from the fixed mold while the movable mold moves downward. From the perspective of the demoulding process, when the injection molded part is demoulding, its surface and the fixed mold are separated. The mold is not bonded, and the resistance is relatively small, which improves the surface quality of injection molded parts when they are demolded.

Description

technical field [0001] The invention relates to the technical field of injection moulds, in particular to an injection mould. Background technique [0002] Injection molding, also known as injection molding, is a molding method of injection and molding. It stirs a completely molten plastic material with a screw at a certain temperature, injects it into the mold with high pressure, and after cooling and solidifying, a molded product is obtained. Mass production of parts with complex shapes. [0003] See attached manual Figure 13 , when the existing mold is formed, the molten plastic material is injected into the cavity between the fixed mold 4 and the movable mold 3 through the injection port, and is cooled and formed through the cooling water channel 5 of the fixed mold 4 and the movable mold 3. After molding , the movable mold 3 is driven by the hydraulic device 1 to separate from the fixed mold 4. After the movable mold 3 is separated from the fixed mold 4, the molded in...

AI Technical Summary

Problems solved by technology

[0005] 1. Since the injection molded part itself still has a certain temperature when it is withdrawn from the mold, there is too much stress inside, the molding strength is not enough, and it has a certain degree of plasticity. The moment the hydraulic device 1 is driven, the inner walls of the movable mold 3 and the fixed mold 4 Create a resistance along the outer wall of the injection molded part on the outer wall of the injection molded part, which will cause the surface deformation of the injection molded part and reduce the molding quality of the injection molded part;

[0006] Secondly, when the mold is withdrawn, the ejector rod 2 will eject the injection molded part. When ejecting, the internal stress of the injection molded part will also be large, which will cause the injection molded part to bend when it is ejected, which will further affect the molding quality of the injection molded part.

[0007] 2. Due to the different resistance between the injection molded part and the fixed mold 4 and the movable mold 3, it often happens that the molded part cannot be withdrawn from the mold together with the movable mold 3, which makes it difficult to take out the molded part and affects the injection molding efficiency

[0008] 3. During the mold ejection process, since the initial state of the injection molded part is molten, after its molding, some residual injection molded particles will remain on the inner wall of the cavity 6 (the inner wall of the movable mold 3 and the fixed mold 4), especially There will be cold material at the gate area. If it is not cleaned up in time, stains and injection marks will appear on the surface of the injection molded part when it is injected again, resulting in a decrease in the quality of the injection molded part.

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