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Grade division, measurement method and influencing factors of machining accuracy of parts
Dec 27, 2018

What is the machining accuracy? It is mainly used for the production of products, it is used to evaluate the quality of parts processing standards. Machining accuracy and machining error are terms used to evaluate the geometric parameters of machining surfaces. The actual parameters obtained by any machining method are not absolutely accurate. From the function of parts, as long as the machining error is within the tolerance range required by the part drawing, the machining accuracy is considered to be guaranteed. Machining precision is generally expressed with IT, IT is to determine the degree of dimensional accuracy, referred to as tolerance. The smaller the tolerance grade, the higher the accuracy of the workpiece represents the product, and the greater the processing difficulty. So how do these processes differ in accuracy? The following xian-ji network subsection for you to introduce the classification of machining accuracy, measurement methods and influencing factors and other relevant knowledge.


Machining accuracy is the degree to which the actual size, shape and position of the surface of the processed parts conform to the ideal geometric parameters required by the drawings. The ideal geometric parameter, for the size, is the average size; For surface geometry, is the absolute circle, cylinder, plane, cone and straight line; For the mutual position between the surfaces, it is absolutely parallel, vertical, coaxial, symmetric and so on. The deviation between actual and ideal geometric parameters is called machining error.

Dimensional accuracy: refers to the degree of conformity between the actual size of the processed part and the tolerance belt center of the part size.

Shape accuracy: refers to the degree of conformity between the actual geometric shape of the processed part surface and the ideal geometric shape.

Position accuracy: refers to the actual position accuracy difference between the surfaces of the processed parts.

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