Casting Process Design of Rear Template of Injection Molding Machine
Author of the article:GENG Xiaoxiao;ZHANG Jucheng;WANG Hao
Author's Workplace：School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing100083,China;School of Materials Engineering,North China Institute of Aerospace Engineering,Langfang065000,Chin;ChangzhouKaida Heavy Industry Technology Co.,Ltd.,Changzhou213151,China
Key Words：rear template ductile iron process design
Abstract：
In view of the characteristics of large ductile iron castings with rear formwork,such as tall castings and more side concave and protruding,three boxes of modeling were adopted,which was convenient for mould extraction and convenient for core placement.The open pouring system with bottom gating system was adopted,and the temperature was balanced,which was beneficial to realize simultaneous solidification.In order to solve the problems of uneven wall thickness and many hot joints of castings,high strength resin sand mold was adopted to eliminate shrinkage porosity and pore shrinkage defects by graphitization expansion.The molting filling of the thick top surface was carried out by using a direct practical riser to eliminate the shrinkage hole and surface collapse.Casting cavity was formed by integral core,combined core modeling,accurate positioning,and tooling design.The results show that the process design improves the production efficiency and quality of castings and saves the production cost.
