Abstract:

To address the problems of large size of turnover baskets， long manufacturing period for molds， small demolding angle of products， high demolding resistance， and difficult ejection， an unconventional idea for mold design was proposed. A new mold structure was designed by abandoning the mold feet and ejector pin plate parts. A four⁃side sliding block core extraction was used with an oil cylinder， and an innovative design scheme was adopted to use the fixed mold pull rod and pull plate to pull out the product for secondary demolding through a mold opening distance， solving the problem of turnover basket demolding. Such a new mold structure design provided a precise selection for subsequent processing and manufacturing. This design scheme adopted a structural design of hydraulic cylinder pushing out the slider and fixed mold opening stroke distance to pull out the product， simplifying the mold structure and greatly reducing the overall size of the mold. A precision numerical control equipment was used in mold manufacturing to ensure the accuracy of the manufactured molds. This also shortened the mold manufacturing cycle and greatly reduced the mold costs. The mold was operated smoothly in actual production together with a reasonable and reliable mold structure and stable product quality， and it achieved good economic and social benefits in the market.

Key words: turnover basket, injection mold design, hydraulic cylinder ejection, fixed mold, pull rod pull plate, secondary demolding