在机械加工过程中,往往有很多因素影响工件的最终加工质量,如何使工件的加工达到质量要求,那就要提高加工精度。加工精度包括如下三个方面:1.尺寸精度:限制加工表面与其基准间尺寸误差不超过一定的范围;2.几何形状精度:限制加工表面的宏观几何形状误差,如:圆度,圆柱度,平面度,直线度等;3.相互位置精度:限制加工表面与其基准间的相互位置误差。在机械加工中,误差是不可避免的,但误差必须在允许的范围内。我们通过误差分析,掌握其变化的基本规律,从而采取相应的措施减少加工误差,提高加工精度。 In the machining process, there are often many factors that affect the final processing of the workpiece quality, how to make the workpiece processing to quality requirements, it is necessary to improve the processing accuracy. Processing accuracy includes the following three aspects: 1. Dimensional accuracy: Limit the size of the machined surface and its reference error does not exceed a certain range; 2. Geometrical shape accuracy: the processing of the surface to limit the macro-geometric errors, such as: roundness, cylindricity, Flatness, straightness, etc .; 3. mutual position accuracy: the processing of the surface and its benchmark to limit the mutual position error. In machining, the error is inevitable, but the error must be within the allowable range. Through error analysis, we grasp the basic rules of its change, so as to take appropriate measures to reduce machining errors and improve machining accuracy.