用本文采用的计算大圆角矩形桥管W方法计算斯太尔桥管W与斯太尔工厂提供的W数值极为相近。利用QT42—10球铁桥壳P—σ_u—N_(50)弯曲疲劳曲线估算出桥壳台架试验要求寿命N_(50)=80万次时的应力σ_u,并按台架试验加载工况计算出桥管必需的W,再利用创立的计算大圆角矩形桥管W方法确定桥管的截面尺寸,设计出了龙江—斯太尔汽车轻量化的铸造桥壳。 Calculating the W-value at the Steyr Bridge with the W-value provided by the Steyr plant is very similar to that used in this paper. The stress σ_u at the required life of N_ (50) = 800,000 was estimated by using P-σ_u-N_ (50) bending fatigue curve of QT42-10 ball-bearing steel shell and calculated according to the test load condition Out of the bridge required W, and then use the founding of the calculation of large rectangular rectangular bridge W W method to determine the cross-sectional size of the bridge to design a Longjiang - Steyr lightweight cast axle housing.