浇注温度、充型速度、增压压力和同步压力是差压铸造过程中对充型过程以及凝固过程影响较大的工艺参数.室温条件下，采用升降法，应力比为0.1进行了疲劳强度测试，并利用田口方法探讨了充型工艺参数对石膏型差压铸造A357疲劳强度的影响.测试结果表明，在1×106循环周次下，不同充型工艺参数下，疲劳强度范围为115～166 MPa.充型速度对A357疲劳强度的影响最大，增压压力、浇注温度、同步压力对疲劳强度的影响依次减弱.%Pouring temperature, filling speed, boost pressure and synchronous pressure are filling parameters of counter pressure casting, which have great influence on the filling and solidification process. At the room temperature, the stairs fatigue test was performed at the condition of stress ratio equal to 0.1. The Taguchi method was used to investigate the relationship between the fatigue performance and filling parameters. Results show that the value of fatigue strength with 1.0 ×106 cycle times variables with the filling parameters from 115 MPa to 166 MPa. Filling speed is the most significant factor among the four parameters. Effects of boost pressure, pouring temperature and synchronous pressure on the fatigue strength decrease successively.
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