Parts processing accuracy classification

Part processing accuracy can be divided into shape accuracy, dimensional accuracy, surface roughness and relative position accuracy.

1. Shape and position accuracy

Geometric accuracy mainly refers to whether the geometric position relationship between various parts of the part meets the design requirements, generally including straightness, parallelism, perpendicularity, roundness, coaxiality, inclination, etc. Among them, straightness, parallelism, and perpendicularity refer to the difference between the straight line or surface detected on the surface of the part and the projection surface, roundness refers to the deviation of the symmetry axis detected from the part and the symmetry axis required by the design, and coaxiality It refers to the deviation of the through hole or screw hole of the part from the circumference or axis of symmetry of other surfaces. The inclination refers to the angle between the surface of the part and the datum plane.

2. Dimensional accuracy

Dimensional accuracy mainly refers to whether the size of the part meets the design requirements, generally including tolerances, positioning dimensions, non-positioning dimensions, diameter, length, etc. Processing, grinding, spraying, etc. can be used during the manufacturing process to control the dimensional accuracy of the parts.

3. Surface roughness

Surface roughness refers to the difference between the average height deviation and the spacing deviation of the part surface, which also indicates the size of the surface waviness. Surface roughness is one of the more important quality factors in the manufacturing process, affecting the service life and performance of parts.

4. Relative position accuracy

Relative position accuracy refers to the requirements for relative position accuracy between different parts of the part. Specifically, it refers to the plane or axis symmetry accuracy of the part, as well as the relative angle, direction and position of the pipe fittings used.

In short, the classification of parts processing accuracy mainly includes four aspects: shape accuracy, dimensional accuracy, surface roughness and relative position accuracy. In actual production, different types of parts need to meet different processing accuracy requirements, so manufacturers need to adopt different processing methods and processes according to actual needs to achieve the corresponding processing accuracy.