Injection mold

Abstract

The invention relates to the technical field of injection molds, and discloses an injection mold. The injection mold comprises a hydraulic device, a hydraulic rod movable mold and a fixed mold, wherein the hydraulic device is in transmission connection with the movable mold through a hydraulic rod, a mold cavity is formed between the movable mold and the fixed mold, a cooling water channel is formed in the mold cavity, a pouring opening is formed in the middle of the fixed mold, the pouring opening communicates with the mold cavity and communicates with an injection molding machine, the middleof the movable mold is in a groove shape, the groove communicates with the mold cavity, a sealing piece is driven to move downwards under the action of a hollow electromagnet, and therefore gradually-changed negative pressure is formed between the sealing piece and the movable mold firstly. The gradually-changed negative pressure acts on the injection molding piece, slow separation between the outer wall of the injection molding piece and the inner wall of the fixed mold can be guaranteed, bonding resistance between the injection molding piece and the fixed mold disappears, separation from the fixed mold is achieved while the movable mold moves downwards, in the demolding process, the surface of the injection molding piece is not bonded with the fixed mold during demolding, resistance isrelatively small, and the surface quality of the injection molding piece during demolding is improved.

Description

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

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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