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We all know that aluminum alloys are widely used in various fields. It is easy for aluminum alloy precision parts to deform during processing. There are many reasons for the deformation of aluminum alloy precision parts, which are related to the material, production conditions, part shape, cutting fluid performance, etc. The following are some tips to avoid deformation of aluminum alloy precision parts processing.
First: Reduce the internal stress of the blank.
Reduce the internal stress of the blank. The internal stress of the blank can be partially eliminated by natural or artificial aging, vibration treatment and other methods; or the cutting ability of the tool can be improved. Reasonable selection of tool geometric parameters and improvement of tool structure.
Second: Improve the clamping method of the workpiece.
For aluminum alloy thin-walled bushing parts, if a three-jaw self-centering chuck or spring collet is used for radial clamping, the workpiece will inevitably deform once it is loosened after processing. At this time, a method of axial end face clamping with good rigidity should be adopted. According to the positioning of the inner hole of the part, a self-made threaded mandrel is inserted into the inner hole of the part, and the end face is pressed with a cover plate, and then tightened with a nut. When processing the outer circle, clamping deformation can be avoided, thereby obtaining satisfactory processing accuracy.
When processing aluminum alloy thin-walled and thin-plate workpieces, it is best to use a vacuum suction cup to obtain a uniformly distributed clamping force, and then process with a smaller cutting amount, which can well prevent the deformation of the workpiece.
Third: Reasonable arrangement of processes
During high-speed cutting, due to the large machining allowance and intermittent cutting, vibration often occurs during milling, affecting the machining accuracy and surface roughness. Therefore, the CNC high-speed cutting process can generally be divided into roughing-semi-finishing-clearing-finishing. For parts with higher precision requirements, sometimes a second semi-finishing is required, and then finishing. After roughing, the parts can be cooled naturally to eliminate the internal stress caused by roughing and reduce deformation.
If you need to process aluminum alloy, you can contact us at any time, we will quote you as soon as possible and provide you with a preferential price.