仪器、仪表中轻质旋转件的滑动结合部位的轴颈,尺寸精度和表面光洁度都要求较高,前者是滑动配合的需要,后者是考虑到经硬质阳极化处理后,能得到耐磨、致密、牢固的阳极氧化层。而固定结合部位的尺寸精度较高,可以达到良好的互换性配合。由于铝合金材料强度低、塑性高、熔点低、线膨胀系数大,一般车削加工很难达到光整加工的要求。 Instrumentation, instrumentation, lightweight rotating parts of the sliding joint journal, dimensional accuracy and surface finish are higher, the former is the need for a sliding fit, which is taking into account the hard anodized, can be wear-resistant , Dense, strong anodized layer. The fixed part of the high dimensional accuracy, can achieve good interchangeability. As the aluminum alloy low strength, high plasticity, low melting point, linear expansion coefficient, the general turning is difficult to achieve finishing requirements.