薄壁轴瓦在自由状态下呈现椭圆形状,瓦口在直径方向有较大的弹张量,无法用通用量具直接检验轴瓦的半圆周长。在国家标准《内燃机主轴瓦及连杆轴瓦技术条件》(GB1151—82)中,规定轴瓦半圆周长的检验按图1所示的方法进行。这种检验方法不仅需要设计制造大批高精度半圆检验模具和加载设备,而且需要进行复杂计算,以适 Thin-walled bush in the free state showed an oval shape, watts mouth in the diameter direction has a larger amount of elastic tension, can not be used directly to measure universal bearing half-circumference. In the national standard “internal combustion engine main bearing and connecting rod bearing technical conditions” (GB1151-82), the provisions of the semi-circular circumference of the bearing inspection shown in Figure 1 method. This test method not only need to design and manufacture a large number of high-precision semi-circular test molds and loading equipment, and the need for complex calculations to