Structure Design of Hot Runner Injection Mold and Hot Cutting Mechanism in Mold for Door Hook Base Cover

doi:10.19491/j.issn.1001-9278.2020.09.016

Abstract

Abstract:

Aiming at three defects in the current mold, we designed a hot runner two?plate injection mold with two cavities for a bottom cover plastic part. In view of the difficulty in demolding plastic parts, we first designed an inclined roof mechanism consisting of an inclined head and a round rod lifter to reduce the machining and assembly difficulties of the lifter mechanism. Afterward, we designed a lifter mechanism with a flat lifter guided by a round rod to overcome the short lifetime of the flat lifter and improve the overall service life of the mold. Thirdly, we designed a hot side gate removing mechanism in the mold, which could effectively improve the production efficiency of plastic parts and reduce the cost of manual gate removing. The reliability of the mold was guaranteed by setting the equal distance type exhaust slot, one side positioning and pressing installation of the forming part, closing the balance block of the mold, and slotting and ventilation of the guide sleeve. The cold side-gate hot removing mechanism in the mold was composed of a gate remo-ving mechanism and a driving mechanism. The mechanism has a simple structure and exhibits a potential for future practical application.

Key words: hot runner, injection molding, lifter mechanism, gate hot removing, structural design

CLC Number:

TQ320.66⁺2

LIU Shaohua, XIONG Jianwu, XU Wenqing, HU Zhiqing, CHEN Liming, WANG Zheneng. Structure Design of Hot Runner Injection Mold and Hot Cutting Mechanism in Mold for Door Hook Base Cover[J]. China Plastics, 2020, 34(9): 90-95.

Figures/Tables 9

Fig.1. 3D model of plastic part

Fig.2. Structure analysis of plastic parts

Fig.3. Analysis of gating system

Fig.4. Setting of parting and demoulding

Fig.5. Principle of gate hot removing in the mold

Fig.6. Mold structures

Fig.7. Demoulding mechanism installation

Fig.8. Hot removing part in mold mechanism

Fig.9. Plastic molded parts

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