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A study on the technology of in-mold punching process for integrated hole piercing of plastic hollow parts  

Lee, Sung-Hee (Department of Molding & Metal Forming R&D, Korea Institute of Industrial Technology)
Publication Information
Design & Manufacturing / v.15, no.4, 2021 , pp. 1-7 More about this Journal
Abstract
A study on in-mold punching technology for hole piercing during molding of hollow plastic parts was conducted. Considering the non-linearity of the HDPE plastic material, mechanical properties were obtained according to the change in temperature and load speed. A standard specimen for the in-mold punching test was designed to implement the in-mold punching process, and the specimen was obtained through injection molding. In order to analyze the influence of process variables during in-mold punching, an in-mold punching mold capable of controlling variables such as temperature and support pressure of the specimen was designed and manufactured. Mold heating characteristics were confirmed through finite element analysis, and punching simulations for changes in process conditions were performed to analyze punching characteristics and reflected in the experiment. Through simulations and experiments, it was found that the heating temperature, punch shape, punching speed, and pressure of the back side of the specimen were very important during in-mold punching of HDPE materials, and optimal conditions were acquired within a given range.
Keywords
In-mold punching; HDPE; Standard specimen; Mold heating; Loading velocity; Internal pressure; Punch shape;
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