螺旋压力机铸造机身的设计允许应力很低,安全系数很大,金属材料消耗很多,但仍难免出现机身的早期失效。本文通过对机身失效规律的分析,从应力强度出发,认为机身早期失效可以防止,机身重量可以减轻。笔者通过一系列铸造可靠性试验和超声波检测试验,提出超声波检测方法,能对铸造机身的实际材料强度进行评估,从而使应力强度模型处于轻微干涉的安全状态。 Spiral press casting body design allows low stress, safety factor is large, a lot of metal material consumption, but still inevitably appear early failure of the fuselage. Based on the analysis of the rule of fuselage failure, starting from the stress intensity, this paper considers that the early failure of the fuselage can be prevented and the weight of the fuselage can be reduced. Through a series of casting reliability test and ultrasonic testing, the author puts forward the ultrasonic testing method, which can evaluate the actual material strength of the casting body, so that the stress intensity model is in a safe state of slight interference.