通常情况下机械加工上的精度主要是指四点:尺寸精度、几何形状精度、相互位置精度、表面粗糙度。在机械加工过程中,误差是无法避免的,不过误差必须控制在一定的允许的范围内。通过误差分析掌握一定的规律,通过这样的规律采取相应的措施减少加工误差来提高加工精度。 Under normal circumstances, the accuracy of machining mainly refers to four points: dimensional accuracy, geometric shape accuracy, mutual position accuracy, surface roughness. In the machining process, the error is unavoidable, but the error must be controlled within a certain allowable range. Through the error analysis to grasp a certain law, through such a law to take appropriate measures to reduce processing errors to improve processing accuracy.