Design of injection mold for automobile elbow joint

doi:10.19491/j.issn.1001-9278.2023.08.015

Abstract

Abstract:

Based on the analysis of the structural characteristics of a plastic part in an automobile elbow joint and its appearance and performance requirements， a complex injection mold was designed， including a core⁃pulling mechanism comprising a fixed mold and a moving mold， a fixed distance priority mold opening mechanism， a mold opening and closing sequence protection device， and a forced mold closing mechanism. Through using a fixed mold inclined slider core⁃pulling mechanism， the problem in lateral undercutting of the plastic part was successfully solved. Aiming at the problems of possible grain peeling and impact on the surface of the plastic flanging structure， a method for side parting and oblique core pulling was adopted to solve these problems. The fixed distance priority mold opening mechanism provided an effective guarantee for the core pulling sequence. The design of a forced mold closing mechanism could avoid collision between the fixed mold slider and moving mold slider during mold closing. The combination of the two sliders with the mold opening and closing sequence protection device ensured the safety and stability of mold production.

Key words: elbow, side parting inclined core pulling mechanism, fixed mold inclined slider core pulling mechanism, fixed distance priority mold opening mechanism, mold opening and closing sequence protection device, forced mold closing mechanism

CLC Number:

TQ320.66⁺2

YE Weiwen, ZHANG Xiaojuan, ZHAO Liping, HOU Xianzhou. Design of injection mold for automobile elbow joint[J]. China Plastics, 2023, 37(8): 107-112.

Figures/Tables 7

Fig.1. Structure of the parts

Fig.2. General assembly drawing of the mold

Fig.3. 3D structure diagram of side parting and oblique core pulling mechanism of the moving mold slider

Fig.4. 3D schematic diagram of mold closing collision state during simulated fixed mold core pulling and first reset

Fig.5. 3D structure diagram of the forced mold closing mechanism

Fig.6. 2D structure diagram of fixed mold inclined slider core⁃pulling mechanism and fixed distance priority mold opening mechanism

Fig.7. 3D schematic diagram of the exhaust system

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