The original error of the process system: the geometric error of the process system, such as the machining principle error, the geometric accuracy of the machine tool, the manufacturing error of the tool and the fixture, the installation error of the workpiece, etc. The mechanical deformation of the process system, thermal deformation, and errors caused by internal stress will affect the accuracy of parts processing. Processing principle error
Such as the approximate processing of production, forming processing, etc., as long as the processing principle error is limited within the allowable tolerance, the productivity can often be greatly improved. The error of the geometric accuracy of the machine tool is such as the radial and axial runout error when the spindle rotates. The straightness error of the machine guide rail in the horizontal and vertical directions, and the parallelism error between the guide rail and the guide soft. Errors in the machine tool drive chain. The tool error measurement error, the thermal deformation error of the process system. Thermal deformation of workpiece, tool, cutting heat, friction heat, incidental heat, etc.
Therefore, many precision machine tools are placed in the constant temperature workshop. (Slow wire machine CNC machine tools, etc.). The deformation caused by the internal stress of the workpiece Among them, the residual stress in the cutting process causes the workpiece to deform. Therefore, in order to reduce the machining accuracy caused by the original error, we usually think of self-turning, self-milling, self-grinding, and self-cutting of the machine tool to try to restore the machining error caused by the original error. For example, the parallelism, perpendicularity and flatness of each surface of aluminum alloy products with a shape of 200*20*400 are processed by the old milling machine, and the flatness is within 0.03. The old wire-cutting machine can process sets of parts with inner and outer circle coaxiality within 0.02, etc. When we think that the machining accuracy is uncontrollable, we have to think of adopting,The original error of the process system and the processing principle