大连精密零部件加工精度是加工后零件表表的现实尺寸、状态、地位三种几何参数与图纸要求的梦想几何参数的切合水平。梦想的几何参数
，对尺寸而言
，就是均匀尺寸；对表表几何状态而言
，就是绝对的圆、圆柱、平面、准和直线等；对表表之间的相互地位而言
，就是绝对的平杏注垂直、同轴、对称等。零件现实几何参数与梦想几何参数的偏离数值称为加工误差。

尺寸精度

指加工后零件的现实尺寸与零件尺寸的公差带中心的相切合水平。

状态精度

指加工后的零件表表的现实几何状态与梦想的几何状态的相切合水平。

地位精度

指加工后零件有关表表之间的现实地位精度差距。

互有关系

通常在设计机械零件及划定零件加工精度时
，该把稳将状态误差节造在地位公差内
，地位误差又应幼于尺寸公差。即精密零件或零件沉要表表
，其状态精度要求应高于地位精度要求
，地位精度要求应高于尺寸精度要求。

The machining accuracy of precision components in Dalian refers to the degree of conformity between the actual dimensions, shape, and position of the surface of the processed parts and the ideal geometric parameters required by the drawings. The ideal geometric parameters, in terms of size, are the average size; For surface geometry, it refers to absolute circles, cylinders, planes, cones, and straight lines, etc; For the mutual position between surfaces, it refers to absolute parallelism, perpendicularity, coaxiality, symmetry, etc. The deviation between the actual geometric parameters of the part and the ideal geometric parameters is called machining error.

dimensional accuracy 

The degree of conformity between the actual size of the processed part and the center of the tolerance zone of the part size. Shape accuracy

The degree of conformity between the actual geometric shape of the machined part surface and the ideal geometric shape.

Position accuracy

The actual positional accuracy difference between the surfaces of the processed parts.

interrelation

Usually, when designing machine parts and specifying the machining accuracy of parts, attention should be paid to controlling the shape error within the positional tolerance, and the positional error should be less than the dimensional tolerance. The shape accuracy requirements of precision parts or important surfaces of parts should be higher than the positional accuracy requirements, and the positional accuracy requirements should be higher than the dimensional accuracy requirements.