The processing accuracy of transfer machine is guaranteed by the accuracy of the machine tool itself, including geometric accuracy, positioning accuracy, repeated positioning accuracy and so on.

First, geometric accuracy: also known as static accuracy, is a comprehensive reflection of the integrated geometric shape error of the key parts of CNC machine tools after assembly.

Second, positioning accuracy: indicates the accuracy of the movement of the measured parts of the machine tool under the control of the numerical control device. According to the measured positioning accuracy value, we can judge the good workpiece that can be achieved in the automatic machining process of the machine tool.

Machining accuracy refers to the gap between the actual position of the part or tool and the standard position (theoretical position, ideal position), the smaller the gap, the higher the accuracy. It is the premise that the machining accuracy of parts can be guaranteed.

Third, repeated positioning accuracy: refers to the consistency of position accuracy obtained by repeatedly running the same program code on the CNC machine tool. It is the consistency of continuous results obtained by processing a batch of parts under the same conditions (on the same transfer machine, different operation methods, and the same part program).

Machining accuracy is mainly used to produce the degree of product, machining accuracy and machining error are the terms to evaluate the geometric parameters of the machined surface. Machining accuracy is measured by tolerance grade, the smaller the grade value, the higher the accuracy; The machining error is expressed by numerical value, and the larger the numerical value, the larger the error. High processing accuracy means small processing error, and vice versa. There are 20 tolerance levels from IT01, IT0, IT1, IT2, IT3 to IT18, of which IT01 indicates that the machining accuracy of the part is higher, and IT18 indicates that the machining accuracy of the part is lower. Generally, IT7 and IT8 are medium levels of machining accuracy.

The actual parameters obtained by any processing method will not be completely accurate. From the point of view of the function of the parts, as long as the processing error is within the tolerance range required by the part drawing, the processing accuracy of the transfer machine is considered to be guaranteed.

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