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Dalian machining positioning error is mainly divided into positioning vice manufacturing error and benchmark does not overlap, positioning in the location of the fixture location, positioning auxiliary manufacturing not standard and benchmark does not overlap will lead to production of mechanical product deviation, affect the accuracy of the workpiece processing, if there is a deviation between positioning reference and design reference, it is difficult to judge through the trial cutting error, machining process of inevitable deviation, but the size of the deviation directly affects the quality and accuracy of the workpiece processing, the value between the positioning reference and positioning manufacturing error is the positioning error value.

The workpiece is easily subjected to the breakdown of the inertia in the production process. The role of knife cutting, transmission and power, in the processing process is easy to cause the workpiece deformation due to improper operation, and then change the accurate position between the workpiece and the tool, so that the workpiece error. Secondly, the hardness and strength of the tool will directly affect the accuracy of the workpiece. If the strength of the tool is too high, the workpiece will not bear the strong cutting force, resulting in deformation, the hardness of the tool and the type of the tool directly affect the error value of the workpiece processing. For example, the rigid outer round blade can bear higher force and is not easy to deform, so the error is small and the accuracy is high. The process error is mainly calculated by the mechanical related formula.