What Factors Affects the Deforamtion in CNC Machined Process
In CNC machined process, it is easy to cause the deformation of work piece due to some misoperation. Creatingway meet this kind of cases a lot in our working experience, material problem, process problem and also some other aspects lead to the problem. These problems are difficult for operators to solve it.
Firstly, you should to determine the specific cause of the deformation, then take measures to solve the related problems. So, what are the main causes of the deformation of the work piece? Let’s talk something about this problem.
What factors affect the deformation in cnc machined process?
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The material and structure of the parts
The deformation size is in direct proportional to the shape complexity, the length-width ratio and thickness of the wall. At the same time, in proportional to the rigidity and stability of material, too. Therefore, it is important to reduce the impact of these factors on the parts when designing, especially the large part need to be make the structure reasonable. Besides, it is necessary to strictly control the blank hardness, slagking and other problems to reduce the deformation.
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Work piece clamping
Workpiece clamping is easy to cause deformation of parts. To avoid this deformation, need to choose the correct clamping point and select the appropriate clamping force according to the position of clamping point. So try to keep the clamping points and supporting points consistent, let the clamping force work on the support role, that clamping point can be more close to the machined surface, so it will not easy to cause deformation due to clamping.
When the workpiece has several directions of clamping force, consider the order of clamping forces. In addition to completing the above steps, also increase the contact area between the workpiece and the fixture or use the axial clamping force, Increase the rigidity of the parts. This is the most effective method to solve the clamping deformation problem.
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Machining process
During the cutting process, the workpiece will be affected by the cutting force. This is a kind of elastic deformation to the force direction. This kind of deformation can be improved on the tool. The tool is required to be sharp when finishing, which can reduce the friction resistance of the tool and the workpiece, and also improve the heat dissipation ability of the cutting workpiece, reduce the residual internal stress on the workpiece.
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Stress deformation after processing
After processing, the parts themselves have a relatively balanced state of internal stress. Although the shape of the parts is relatively stable at this time, when some materials and heat treatment are removed, the internal stress will change, and the workpiece needs to regain the balance of force. For this to be improved by heat treatment, to keep the stable of internal organization of the workpiece after hot straightening.
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