Retreat-preventing mechanism for core loosing of die, and die

Abstract

The invention provides a retreat-preventing mechanism for core loosing of a die. The retreat-preventing mechanism comprises a die body, a drive unit mounted on the die body, a driving member connectedwith the output terminal of the drive unit, an internal drawing fixed block, an internal drawing arranged on the internal drawing fixed block and a retreat-preventing block, wherein a guide groove extending along an interior-to-exterior direction is arranged in the internal drawing fixed block; the retreat-preventing block is embedded in a guiding groove; the driving member is provided with an active part; the retreat-preventing block is provided with a passive part mating with the active part; and a spacing groove is arranged on the die body. When the drive unit pushes the driving member tomove forward, the driving member pushes the retreat-preventing block, the internal drawing fixed block and the internal drawing head to move forward, and the driving member also pushes the retreat-preventing block to extend outward and then to be embedded into the spacing groove in the die body; and when the drive unit pulls the driving member to move backward, the driving member pulls the retreat-preventing block to contract inwardly and retreat from the spacing groove, and the driving member pulls the retreat-preventing block, the internal drawing fixed block and the internal drawing head tomove backward.

Description

technical field [0001] The invention relates to a mold core-pulling mechanism, in particular to a mold core-pulling anti-retreat mechanism and a mold. Background technique [0002] When using an injection mold to process a product with a through hole, groove, or boss, the product cannot be directly released from the mold during the demoulding process, but must be used to form the through hole, groove, or boss first. The core is pulled out from the mold body, that is, core pulling. This requires a mechanism that can extract and reset the core, that is, a core-pulling mechanism. [0003] The fixed mold core is usually driven by an oil cylinder. In the production process, the core is first moved forward relative to the mold body through the oil cylinder; then the injection molding process is performed; after the injection molding is completed, the core is pulled back relative to the mold body through the oil cylinder, thereby realizing core pulling. However, during the injec...

AI Technical Summary

Problems solved by technology

However, during the injection molding process, the core will retreat along the core-pulling direction due to the injection pressure, which will cause the product to be unqualified

At the same time, because it is a fixed mold core pulling, ordinary locking blocks cannot be added

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