Design of Injection Mold with Compound Core Pulling Mechanism for End Cover

doi:10.19491/j.issn.1001-9278.2020.10.014

Abstract

Abstract:

Aiming at the difficulties in performing the injection molding automation of plastic parts， a pair of single point submerged gate and two-plate twice-open mold injection mold were designed. The mold layout was set as one mold with two cavities. The single cavity mechanism in the mold was set as a fixed mold side with a fixed mold ejection mechanism driven by oil cylinder. On the side of the moving mold， there were two special compound mechanisms with an inclined roof and a slider block， a universal inclined roof mechanism， a tunnel slider block mechanism and an ejector pin ejection mechanism. The ejector mechanism of the fixed mold was driven by the oil cylinder to drive the fixed mold ejector plate to drive six inclined ejector rods to demold the six inverted buckle features automatically. Two special composite mechanisms were designed to be composed of a double slider with an inclined roof three times composite core pulling mechanism and a single slider inclined roof two times core-pulling mechanism. The function of these two mechanisms was to drive the slide block through the inclined guide pillar so as to drive the inclined top in the slide block to implement the secondary core pulling for the purpose of multiple multi-directional core pulling in the local area of the plastic part. In this mechanism， the use of universal inclined roof mechanism can effectively reduce the height and size of the mold. Moreover， by using the tunnel slider inclined core-pulling mechanism and adding a template opening by the side of the moving mold to drive the tunnel slider to implement inclined core pulling， the mold opening power can be utilized effectively， and the mold manufacturing cost can be reduced.

Key words: compound mechanism of inclined roof slide block, tunnel slide block, injection mold, automation, mechanism design, mold structure

CLC Number:

TQ 320.66⁺2

Hui XU. Design of Injection Mold with Compound Core Pulling Mechanism for End Cover[J]. China Plastics, 2020, 34(10): 80-85.

Figures/Tables 10

Fig.1. Shape of plastic parts

Fig.2. Parting surface setting of single chamber

Fig.3. Design of formed parts

Fig.4. Cooling water path of formed parts

Fig.5. Fixed mould lifter mechanism

Fig.6. Structure of mechanism S1

Fig.7. Structure of mechanism S2

Fig.8. Structure of mechanism D1 and D2

Fig.9. Structure of the mould

Fig.10. Working principle of the mould

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