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When the workpiece is clamped, the correct clamping point should be selected first, and then the appropriate clamping force should be selected according to the position of the clamping point. Therefore, as far as possible to make the clamping point and support point consistent, so that the clamping force acting on the support, clamping point should be as close to the processing surface as possible, and choose the position of the force is not easy to cause clamping deformation.
When the workpiece has several direction of clamping force for use, to consider the sequence of clamping force, for the workpiece and support contact clamping force should be acted first, and not easy to be too large, for the balance of cutting force of the main clamping force, should act in the last.
Secondly, the contact area between the workpiece and the fixture should be increased or the axial clamping force should be adopted. Increasing the rigidity of parts is an effective way to solve the problem of clamping deformation, but because of the shape and structure characteristics of thin-walled parts, it has a low rigidity. In this way, under the action of clamping force, deformation will occur.
Increasing the contact area between the workpiece and the fixture can effectively reduce the deformation of the workpiece during clamping. For example, in the milling of thin-walled parts, a large number of elastic plate, the purpose is to increase the stress area of contact parts; When turning the inner diameter and outer circle of the thin-walled sleeve, whether it is a simple opening transition ring, or the use of elastic mandil shaft, whole arc claw, etc., it is used to increase the contact area of the workpiece clamping. This method is conducive to bearing the clamping force, so as to avoid the deformation of parts. The use of axial clamping force, is also widely used in production, design and manufacture of special fixture can make the clamping force on the end face, can solve the workpiece wall is thin, rigidity is poor, resulting in the workpiece bending deformation.