In the whole process of CNC processing, the deformation of the processed parts is very widespread. The lack of accuracy can be processed for one two times, but the deformation of the processed parts must be reworked rebuilt. The deformation of the processed parts is a difficult problem to deal with. The best way to deal with it is to avoid the deformation of the CNC processed parts for fundamental reasons. The following people discuss how the CNC machining parts are deformed.
1. The damage of the workpiece data structure to the deformation of the workpiece
The size of the deformation its posture complexity, length, total width wall thickness are proportional to the stiffness reliability of the data. -Generally, when designing parts for the project, the damage of this element to the deformation of the workpiece should be reduced. Special-it is necessary to ensure reasonable equipment in the construction of some large parts. In the whole process of unfolding machining manufacturing, it is necessary to carry out operations on the strength looseness of the blank to ensure the quality of the blank reduce the deformation of the workpiece.
2. Deformation caused by workpiece clamping
At the time of workpiece clamping, it is necessary to the appropriate clamping point the appropriate clamping force at this location. Therefore, it is necessary to keep the clamping point the fulcrum consistent, so that the clamping force is effective on the supporting point, the clamping point should be as close as possible to the processing surface, the part that is easy to form the clamping deformation under pressure should be selected. When the clamping force of multiple orientations on the workpiece is effective, it is necessary to order the clamping force in order to make the workpiece the support point touch the clamping force first, it is easy to be too large, for balanced cutting speed The key clamping force should be the final result. Secondly, it is necessary to expand the total contact area between the workpiece the fixture its radial clamping force. The rigidity of the parts is improved, it is very reasonable to deal with the clamping deformation. However, due to the posture structural characteristics of thick-walled parts, they will have lower stiffness. In that way, under the effect of clamping force, it will cause deformation.
3. Deformation caused by workpiece processing
In the whole process of drilling, due to the effect of the cutting speed, the workpiece will form a ductile deformation toward the compression direction, which is to say the tool is given. For similar deformations, effective countermeasures can be adopted on the CNC blades. At the time of deep processing, the CNC blades are sharp, so that on the one hand, the frictional resistance caused by the friction between the CNC blade the workpiece can be reduced, on the other hand, the CNC can be improved. When the blade drills the workpiece, the heat pipe's ability to dissipate heat, thereby reducing the residual internal stress on the workpiece.
The heat generated by the friction between the CNC blade the workpiece during processing will also deform the workpiece, generally will choose high-speed drilling. In this type of machining, because the cutting is removed in a relatively short period of time, most of the drilling heat is taken away by the cutting, which can reasonably reduce the deformation.
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