Reduce the Scrap Rate of 4A Cylinder by Process Design
Author of the article:GUO Dandan;DUAN Suhong;YANG Chunxia;GAO Cunzhen;YIN Dongxue
Author's Workplace：First Tractor Company Limited,Luoyang 471004,China;College of Agricultural Equipment Engineering,Henan University of Science and Technology,Luoyang 471004,China
Key Words：cylinder block burn-in sand defect sand inclusions process design
Abstract：In view of the sand inclusion, burn-in sand defect, block leaking and other defects in the production of 4 A cylinder block, casting process design of 4 A cylinder block was optimized. The upper and bottom molds in the original design were reversed, the sand core easy to cause burn-on was separated and made specially using 140/70 mesh coated sand and dipped by resistant burn-in and burn-on coating. lean production was applied in the production. The results showed that sand burn-in and burn-on defects were completely eliminated, and the casting rejection rate decreased from24.6% to 6.28%.
