Causes and Reduction Methods of Deformation in Aluminum Stamping Parts Processing

Stamping manufacturers produce various materials of stamping products, among which aluminum stamping materials have a relatively large coefficient of thermal expansion, especially when using free forging blanks, the processing allowance is large, resulting in increased deformation defects.

Causes of deformation in the processing of aluminum stamping parts:

There are many reasons for deformation, mainly related to the material of the part, the shape of the part, production conditions, and the performance of the cutting fluid. The main manifestations are;

Deformation caused by internal stress in the blank during punch die process, deformation caused by cutting force and cutting heat, and deformation caused by clamping force.

How to reduce the occurrence of deformation during the processing of aluminum stamping parts?

• Reduce the internal stress of the blank; natural or artificial aging and vibration treatment can partially eliminate the internal stress of the blank. Pre-machining is also an effective process method. For larger blanks, because of the large allowance, deformation may increase after processing. If the excess part of the blank is machined first to reduce the excess portion, placed in advance for a period of time, not only can release some internal stress, but also reduce deformation during processing;

• Reasonable selection of tool geometry parameters to improve the cutting ability of the tool; the material and geometry parameters of the tool have an important impact on cutting force and cutting heat. Choosing the right tool is crucial to reduce part processing deformation;
  

• Adjust the clamping method of aluminum stamping parts; for thin-walled aluminum alloy workpieces with poor rigidity, if a three-jaw self-centering chuck or spring chuck is used for radial clamping, the workpiece will inevitably deform after processing. At this time, the method of pressure compression of the axial end face with better rigidity should be used. Positioning the inner hole of the part, making a threaded through shaft, and inserting it into the inner hole of the part. Use a cover plate to press the end face and then back it up with a nut. When processing the outer circle, clamping deformation can be avoided, thereby achieving satisfactory processing accuracy.
  

When processing thin-walled and thin-plate workpieces, using a vacuum suction cup to obtain evenly distributed clamping force, and then processing with a smaller cutting amount can effectively prevent workpiece deformation.

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