Design of Injection Mold for Plastic Parts with Dense Shaped Holes

doi:10.19491/j.issn.1001-9278.2020.11.014

Abstract

Abstract:

Aiming at the shell plastic parts with complex narrow and porous structure， we designed a type of mould structure with core pulling and secondary ejection through the back die insert. In this structure， the rear die insert was designed with a taper structure. Under the control of spring and limit pull rod， the rear die insert was pulled out from the plastic part at first， and then the second ejection action was completed by a thimble. Such a design successfully resolved the demolding problem in the complex， narrow and porous shell plastic parts. The die structure layout is reasonable， the mechanism design is ingenious， and the action is reliable. This structure is advantageous for the reduction of production and manufacturing costs and therefore can provide a useful reference for the design of molding die of similar plastic parts.

Key words: injection mold, mold design, insert design, secondary ejection, mold structure

CLC Number:

TQ320.66⁺2

WANG Jing, LIU Xuemin, CUI Yubo. Design of Injection Mold for Plastic Parts with Dense Shaped Holes[J]. China Plastics, 2020, 34(11): 81-85.

Figures/Tables 6

Fig.1. Structure of plastic parts

Fig.2. Mold cavity structure

Fig.3. Composite insert structure

Fig.4. Mold core structure

Fig.5. Secondary ejection structure

Fig.6. Mold structure

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