Design and Optimization of Gating System for Low Pressure Die Casting of Automobile Steering Valve Housing

Author of the article:TAO Jian, SU Xiaoping, KANG Zhengyang, ZHOU Dashuang

Author's Workplace：School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211800, China

Key Words：numerical simulation; gating system; DOE; signal to noise ratio analysis

Abstract：The structure of the valve shell of the steering gear was analyzed. According to the technological requirements of low pressure casting, two kinds of gating systems were designed, and their numerical simulation was carried out. After analyzing the defects, the better scheme was selected and the structure was improved. The effects of filling speed, pouring temperature, preheating temperature of upper die and preheating temperature of lower die on shrinkage porosity and porosity of casting were studied by using Taguchi orthogonal DOE method and SNR analysis. The results show that when the filling speed is 35 mm/s, the casting temperature is 690 ℃, the preheating temperature of the upper die is 370 ℃, and the preheating temperature of the lower die is 340 ℃, the casting defects of shrinkage cavity and porosity in the valve shell of the steering gear are basically eliminated.