普通机床上的内圆磨具,大多数采用滚动轴承,其精度较高,一般均用D级精度以上的轴承。装配工艺也很严格。新装好的磨具一般能磨出(?)9～10的表面光洁度内孔。由于滚动轴承在高速重载荷下易于磨损,精度保持性差,使用不久其加工光洁度即降低为(?)7～8。目前,国内采用的静压轴承内圆磨具,大多是小孔节流,也有部分薄膜节流或内节流。这些磨具轴承较长,温升较高,而有了温升以后,油膜刚度 Ordinary machine tool grinding wheel, the majority of the use of rolling bearings, the higher precision, generally with D-level precision bearings above. Assembly process is also very strict. Newly installed abrasive general grinding (?) 9 ~ 10 surface finish bore. As the rolling bearing is easy to wear under high speed and heavy load, the accuracy of maintenance is poor, the use of its processing finish is reduced to (?) 7 ~ 8. At present, the hydrostatic bearing internal circular grinding tools used in China are mostly small hole throttling, and some thin film throttling or internal throttling. These abrasive bearings longer, higher temperature, and with the temperature rise, the film stiffness