Injection mold design for an automotive storage box plastic part

doi:10.19491/j.issn.1001-9278.2025.10.020

Abstract

Abstract:

This study presents the design of a high⁃precision injection mold for a complex automobile storage box component. To meet the part's strict technological requirements， a single⁃cavity structure and a tailored gating scheme were adopted， complemented by a dedicated mold balancing device for smooth operation. Two design schemes were compared to determine the optimal parting surface location， resulting in a two⁃parting⁃plane structure and a long⁃stroke， two⁃stage core⁃pulling system. The first parting plane （PL1） offers two key advantages： firstly， it facilitates the early removal of the fixed mold core insert to prevent the part from adhering to the stationary side； secondly， it employs an angled pin mechanism for the initial breakaway of the core to overcome high pellet packing forces. A hydraulic cylinder then executes a second core⁃pulling stage to achieve reverse withdrawal. This approach guarantees cylinder stability during the final ejection phase， leading to marked improvements in both production efficiency and product quality.

Key words: automobile storage box, type surface, spacing priority opening, core extraction mechanism, cylinder, die balancing device

CLC Number:

TQ320.66⁺2

ZHAO Liping, YANG Zhanpeng, CHEN Yinghua, CHENG Yu, HUANG Qiye, QIN Ruiliang. Injection mold design for an automotive storage box plastic part[J]. China Plastics, 2025, 39(10): 129-134.

Figures/Tables 7

Fig.1. 3D diagram of the structure of plastic parts

Fig.2. A schematic diagram of the subtyping scheme

Fig.3. 3D diagram of feeding glue

Fig.4. 3D schematic diagram of the core pumping mechanism layout

Fig.5. 3D schematic diagram of sequential parting and core pulling states

Fig.6. 3D schematic of the exhaust system， insert， and thimbl

Fig.7. Schematic diagram of the mould 3D

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