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高精度滑动轴承的形位公差要求较高,它的内、外圆的同轴度要求为0.014～0.018 mm。如冷冻机8FS10-LN.的主轴承,其内、外圆的同轴度为0.015mm,因此夹具的定心精度要保持在0.005mm以下,才能加工出高精度的滑动轴承。滑动轴承的精加工,一般是先精磨其外圆,然后以其外圆作定位基准面精加工内圆。滑动轴承的内圆表面是一层耐磨合金材料,一般是锡基或铜基材料,其硬度为HB20～35,不能在磨床上用砂轮磨削加工,必须在车床上精车。这样就要设计出定心精度为0.005mm以下的精车内圆夹具。一般车床上常用夹头的定心精度为0.02～0.16mm,不能满足高精度滑动轴承的精车要求。今设计一种夹具,如图1所示。它是利用膜片1受外力后所产生的弹性变形来对工件定位和夹紧的。
High-precision plain bearings require high geometric tolerances, and their concentricity requirements for the inner and outer rings are 0.014 to 0.018 mm. Such as the freezer 8FS10-LN. The main bearing, the concentricity of the inner and outer circles is 0.015mm, so the centering accuracy of the fixture should be kept below 0.005mm, in order to produce high-precision plain bearings. The finishing of the sliding bearing is generally the first to finely grind its outer circumference, and then use its outer circumference as the positioning datum to finish the inner circle. The inner surface of the sliding bearing is a layer of wear-resistant alloy material, usually tin-based or copper-based materials, the hardness of HB20 ~ 35, can not grind on the grinding wheel, must be fine on the lathe. This will be designed to centering precision of 0.005mm below the fine car inner fixture. General lathe commonly used chuck centering accuracy of 0.02 ~ 0.16mm, can not meet the requirements of precision car bearings. Now design a fixture, shown in Figure 1. It is the use of diaphragm 1 by the external force generated by the elastic deformation of the workpiece positioning and clamping.