Thin wall low-pressure injection molding secondary forming mechanism

Abstract

The invention belongs to the technical field of mold equipment and provides a thin wall low-pressure injection molding secondary forming mechanism. The thin wall low-pressure injection molding secondary forming mechanism comprises a front mold assembly and a lower mold assembly. The front mold assembly comprises an upper fixing plate, a female mold plate and a hot runner; a valve needle is arranged at the front end of the hot runner; the female mold plate is fixed to the upper fixing plate; the hot runner is arranged inside a female mold. The lower mold assembly comprises a lower fixing plate, a supporting block and a male mold plate, wherein the supporting block is fixed to the lower fixing plate. The lower mold assembly further comprises a secondary forming device located below a male mold core. The thin wall low-pressure injection molding secondary forming mechanism has the advantages that a core of a mold, namely an ejector block adopts the through hole and insert mode, the ejector block can vertically move in the oil cylinder driving mode, and the ejector block moves to drive the thickness of a cavity to change; an oil cylinder is controllable in stroke, so that the thickness of products changes with the controllable wall thickness, the injection molding pressure is low, pressure maintaining is even, internal residual stress of formed products is low, and products deform a little.

Description

technical field [0001] The invention belongs to the technical field of mold equipment, and relates to a secondary molding mechanism for thin-wall low-pressure injection molding. Background technique [0002] For some long or thin-walled products, multi-glue ports, product pre-deformation, high-pressure and high-speed injection molding process are generally used to improve product deformation and performance problems, but this method has high mold costs and pre-deformation The risk is high, the product qualification rate is low, the mold life is reduced, the product size is unstable, the qualification rate is low, and shrinkage and flashing will occur locally. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a thin-walled low-pressure injection molding secondary molding mechanism for the current situation of the prior art, which can compress the product after injection molding the product, and the internal residual...

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Problems solved by technology

[0002] For some long or thin-walled products, multi-glue ports, product pre-deformation, high-pressure and high-speed injection molding process are generally used to improve product deformation and performance problems, but this method has high mold costs and pre-deformation The risk is high, the product pass rate is low, the mold life is reduced, the product size is unstable, the pass rate is low, and shrinkage and flash will occur locally

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