During the processing of hardware parts, there will be some problems that affect the accuracy. So what are the factors that affect the accuracy of machining? Let's take a look at it together:
The original error of the process system: the geometric error of the process system, such as the processing 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 errors such as approximate processing of production, forming processing, etc., as long as the processing principle errors are limited within the allowable tolerance, productivity can often be greatly improved.
The error of the geometric accuracy of the machine tool for the processing of hardware parts, such as the radial and axial runout error when the spindle rotates. The straightness error of the machine tool guide rail in the horizontal and vertical directions, and the parallelism error between the guide rail and the guide rail. Errors in the machine tool drive chain.
The tool error measurement error of hardware parts processing, the thermal deformation error of the process system. The thermal deformation of the workpiece and the tool, cutting heat, friction heat, incidental heat, etc., so many precision machine tools are placed in the Tanwen workshop, (slow wire machine, CNC machine tools, etc.). The deformation caused by the internal stress of the workpiece includes the cutting process. The residual stress in the workpiece causes plastic deformation of the workpiece.
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 tools process sets of parts with inner and outer circle coaxiality within 0.02, etc. When we think that the machining accuracy is uncontrollable, we must think of adopting self-turning, self-milling, self-grinding, These methods are self-cutting to lift.