Design of new stacked injection mold of microwave oven inner cover

doi:10.19491/j.issn.1001-9278.2025.02.017

Abstract

Abstract:

A new stacked injection mold was designed according to the structural characteristics of the microwave oven inner cover. The mold adopts a new product layout， an interflow injection method， and a new lifter structure of hot and cold runners were adopted for the designed mold， resulting in a reduction in the mold cost by 40 % and a decrease in the tonnage of injection machines by 45 %. Through using a minimalist action control mechanism instead of the conventional stacked gear and rack action control mechanism， the molding cycle was shortened by 10 %. Square guide pillars and guide sleeves were adopted for the mold guiding and positioning system， improving the accuracy and lifespan of the mold greatly.

Key words: microwave oven inner cover, new stacked injection mold, new lifter structure, minimalist action control mechanism, injection method of hot and cold runner

CLC Number:

TQ320.5

LI Guolin. Design of new stacked injection mold of microwave oven inner cover[J]. China Plastics, 2025, 39(2): 91-93.

Figures/Tables 6

Fig. 1. Inner cover of the microwave oven

Fig. 2. Layout of the part and injection system

Fig. 3. Undercut of the part

Fig. 4. Structure of the lifter and schematic diagram of the sequence of actions

Fig. 5. Structural diagram of a new type of stacked injection mold of inner cover of a microwave oven

Fig. 6. Stereoscopic diagram of a new type of stacked injection mold of inner cover of a microwave oven

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