Mold Design for Mobile Phone Cases Based on Hot⁃cutting In⁃mold

doi:10.19491/j.issn.1001-9278.2020.04.015

Abstract

Abstract:

Aiming at the current situation that the traditional cold runner mold requires the manual removal of freezing materials in the gating system and the poor technical effect of cold?cutting gate, a mobile phone case was taken as an example to design a injection mold for the mobile phone case with a hot?cutting gate function. According to the structural characteristics of the lapping and side gate, an accurate motion cutting device was designed to ensure the clean gate cutting, and then a drive cylinder with appropriate infeed time was established by the finite element analysis method. Moreover, a reasonable ejector and cooling mechanism were designed to ensure the product and gating system ejected safely after separation and cooling.

Key words: gate, hot?cutting, cutter, drive cylinder

CLC Number:

TQ 320.66

Xin WANG, Linfang DU, Longfei CAI, Chi ZHANG. Mold Design for Mobile Phone Cases Based on Hot⁃cutting In⁃mold[J]. China Plastics, 2020, 34(4): 90-95.

Figures/Tables 15

Fig.1. Effects comparison of cold?cutting gate and hot?cutting one

Fig.2. Plastic structure

Fig.3. Cavity layout

Fig.4. The structure of the mold core

Fig.5. Gating system design

Fig.6. Hot?cutting system

Fig. 7. Timing controller

Fig.8. Cutter device

Fig. 9. Mesh analysis model

Fig. 10. Fill time analysis

Fig.11. Pressure analysis at the gate of the product

Fig.12. Ejection mechanism design

Fig.13. Cooling pipe distribution

Fig.14. Combined assembly drawing

Fig.15. Cross?sectional assembly drawing

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