Failure Mode and Casting Process Optimization of Automobile Brake Drum

Author of the article:YU Xiang hai 1 , TAO Lei 1 , YU Weili 2 , ZHANG Xiangzhong 1 , LI Jian 1 , QIN Pengpeng 1 , JIANG Hao 1

Author's Workplace：1.Zhumadian CIMC Huajun Casting Co., Ltd., Zhumadian 463000, China; 2. Gree Electric Appliances, Inc.of Guangdong, Zhuhai 519000, China

Key Words：cracks; isometric crystal; columnar crystal; bottom note; resistance to thermal fatigue

Abstract： Longitudinal crack on brake surface of truck brake drum is more harmful than network cracks. The short
columnar crystal on the braking surface and the fine equiaxed crystal in the center can effectively avoid the generation of
longitudinal cracks. The bottom pouring casting process produces a large number of fine equiaxed grains at the upper brake
surface of the brake drum, which inhibits the growth of columnar grains at the lower part.