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  • It Is Easy To Cause The Workpiece Deformation By Those Factors In Precision Machining.
    Jan 10, 2019

    In the precision machining, the deformation of the workpiece is mainly caused by what factors?


    1. The material and structure of the workpiece. The deformation of the workpiece is proportional to the complexity of the shape, the aspect ratio and the thickness of the wall, as well as to the rigidity and stability of the material. Therefore, in the design should pay attention to reduce the impact of these factors on the workpiece. Especially for large part structure, it is necessary to make the structure reasonable, in addition, it is necessary to strictly control the hardness and looseness of the blank and reduce the deformation of the workpiece.


    2, workpiece clamping. The clamping of the workpiece can easily cause the deformation of the workpiece. In order to avoid this deformation, the correct clamping point should be selected, and the appropriate clamping force should be selected according to the position of the clamping point. So try to keep the clamping point and supporting point of the workpiece consistent and let the clamping force act on the support so that the clamping point can be closer to the machining surface so that the deformation caused by clamping is not easy to be caused. When there are clamping forces in several directions on the workpiece, the order of the clamping forces should be considered. The clamping force of the workpiece and the support should be acted first, and not too big, and the main clamping force of the balanced cutting force should be acted at the end. In addition to completing the above steps, it is necessary to increase the contact area between the workpiece and the fixture or use axial clamping force. Increasing the rigidity of parts is the most effective way to solve clamping deformation. Increasing the contact area between workpiece and fixture is helpful to reduce the deformation of workpiece clamping.


    3, precision machining workpiece cutting tool. In the cutting process, the workpiece will be subjected to the cutting force, which is a kind of elastic deformation in the direction of force. This kind of deformation can be improved on the cutting tool, and the tool is required to be sharp in precision machining, which can reduce the friction resistance between the tool and the workpiece, improve the heat dissipation ability of the cutting tool and reduce the residual internal stress on the workpiece. 


    4. Stress and deformation after precision machining. The internal stress of the part itself is relatively balanced after machining. Although the shape of the part is relatively stable at this time, the internal stress will change after removing some materials and heat treatment, and the workpiece needs to reach the balance of force again. To improve this situation, it can be solved by means of heat treatment. The workpieces that need to be straightened are folded into a certain height, pressed into a flat state by a certain tooling, and then put together with the workpieces into the heating furnace. Choose different heating temperature and heating time according to the material of parts. Hot straightening allows the internal structure of the workpiece to remain stable.