机械加工精度是指零件加工后的实际几何参数(尺寸、形状和位置)与理想几何参数相符合的程度。它们之间的差异称为加工误差。加工误差的大小反映了加工精度的高低。误差越大加工精度越低,误差越小加工精度越高。本文简要介绍了加工精度与加工误差基本知识。结合生产教学实际,详细介绍了各种误差极其形成原因,并就如何减小误差,提高机械加工精度提出了自己的观点。 Machining accuracy is the degree to which the actual geometrical parameters (size, shape and position) of the part after machining correspond to the ideal geometrical parameters. The difference between them is called the machining error. The size of machining error reflects the level of machining accuracy. The greater the error the lower the machining accuracy, the smaller the error the higher the machining accuracy. This article briefly introduces the basic knowledge of machining accuracy and machining error. Combined with the production of teaching practice, describes in detail the causes of various errors extremely formed, and put forward their own views on how to reduce the error and improve the machining accuracy.