零件的生产和完工过程中都需要就其尺寸进行合格性的验收。合适的尺寸信息处理和表达,可以有效地提高零件的成品质量,并降低零件的加工成本。本文针对造成零件尺寸误差产生的原因进行了详细的分析。通过对尺寸公差、上下验收极限的讨论,据此给出了选用计量器具的方法,对机械零件可靠性检验具有一定的指导意义。 Parts of the production and completion of the process needs to be the size of the acceptance of their qualifications. Appropriate size information processing and expression, can effectively improve the quality of finished parts, and reduce the processing costs of parts. In this paper, a detailed analysis of the causes of part size errors is given. Through the discussion of dimensional tolerance, upper and lower acceptance limits, the method of selecting measuring instruments is given, which is of guiding significance to the reliability test of mechanical parts.