What factors in precision CNC machining will cause deformation of the workpiece ?

- Nov 21, 2019-

With the rapid development of this society, industrialization has also been replaced with newer generations. 

Precision CNC machining has occupied a leading position in industrialization, bringing quality improvement to industrialization. However, it is also bad, for example, it will cause work. 

Deformation, then what causes the work to deform? If you want to know,  

The shape and size of the deformation amount is proportional to the width and thickness ratio and the width and length, and is proportional to the material stability and rigidity. Therefore, the influence of these factors on the deformation of the workpiece is minimized when designing the part. Especially in the structure of large parts, the structure should be reasonable. Before processing, the defects such as hardness and looseness of the blank should be strictly controlled to ensure the quality of the blank and reduce the deformation of the workpiece.


When clamping the workpiece, first select the correct clamping point and then select the appropriate clamping force according to the position of the clamping point. Therefore, the clamping point and the supporting point should be made as close as possible, so that the clamping force acts on the support, the clamping point should be as close as possible to the working surface, and the position where the force is not easy to cause the clamping deformation is selected.

When there is a clamping force in several directions on the workpiece, the order of the clamping force should be considered. The clamping force should be applied first to make the workpiece and the support contact, and it is not too large. The main clamping force for balancing the cutting force Should act at the end.

Secondly, the contact area between the workpiece and the clamp should be increased or the axial clamping force should be used. Increasing the rigidity of the part is an effective way to solve the clamping deformation, but due to the shape and structure of the thin-walled part, it has a lower rigidity. In this way, deformation occurs due to the application of the clamping force.

Increasing the contact area between the workpiece and the fixture can effectively reduce the deformation of the workpiece when it is clamped. For example, when milling thin-walled parts, a large number of elastic pressure plates are used, the purpose is to increase the force receiving area of the contact parts; when turning the inner diameter and the outer circle of the thin-walled sleeve, 

whether using a simple open transition ring or an elastic mandrel The entire arc claws, etc., are used to increase the contact area when the workpiece is clamped. 

This method is advantageous for carrying the clamping force and thus avoiding deformation of the part. The axial clamping force is also widely used in production. 

The special fixture designed and manufactured can make the clamping force act on the end surface, which can solve the bending deformation of the workpiece due to the thin wall of the workpiece and the poor rigidity.


For more detailed information, Welcome to check the website : www.lemo-machining.com

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