What is machining accuracy and what are its main aspects?

Machining accuracy is the degree of conformity between the actual size, shape and position of the surface of the machined part and the ideal geometric parameters required by the drawing. The ideal geometric parameter of size is average size; For surface geometry, it is an absolute circle, cylinder, plane, cone and straight line.

For the mutual position between faces, it is absolutely parallel, vertical, coaxial, symmetrical, etc. The deviation between the actual geometric parameters and the ideal geometric parameters of a part is called machining error.

Extended data

Machining accuracy is mainly used to produce products. Machining accuracy and machining error are terms to evaluate the geometric parameters of machined surfaces. Machining accuracy is measured by tolerance grade, and the smaller the grade value, the higher its accuracy; The machining error is expressed by numerical value, and the greater the numerical value, the greater the error. High machining accuracy means small machining error, and vice versa.

There are 20 tolerance levels from IT0 1, IT0, IT 1, IT2, IT3 to IT 18 * *, in which IT0 1 indicates the highest machining accuracy of the part, and IT 18 indicates the lowest machining accuracy, generally IT7 and IT8.

The actual parameters obtained by any processing method will not be absolutely accurate. As far as the function of parts is concerned, as long as the machining error is within the tolerance range required by the part drawing, it is considered that the machining accuracy is guaranteed.

The quality of the machine depends on the processing quality of the parts and the assembly quality of the machine. The machining quality of parts includes two parts: machining accuracy and surface quality.