With the rapid development of material science and manufacturing skills, aluminum alloy parts, especially aluminum alloy shell parts, are increasingly used in the industrial field and daily life. With the expansion of the scope of application and the increase in the number of applications, the requirements for the processing quality of aluminum alloy shells are also getting higher and higher. For this reason, the processing technology and processing quality of aluminum alloy shells have attracted more and more attention. The editor who has been engaged in aluminum alloy casings for a long time explored the actual production and summarized effective methods to reduce deformation during the processing of aluminum alloy casings.

For workpieces with poor rigidity, aluminum alloy shells can be reduced in deformation by improving fixtures and stuffing.

Regarding the thin-walled aluminum alloy shell workpiece, the three-jaw self-centering chuck or stretch spring chuck cannot be clamped from the radial direction, because the workpiece will be deformed once it is loosened after processing. Therefore, the compression method of the axial end face with better rigidity should be fully utilized to reduce the deformation of the workpiece. Positioning by the inner hole of the part, it is recommended to make a self-made threaded mandrel, insert it into the inner hole of the part, and then use a cover plate to press the end face, and back it with a nut. The clamping deformation can be prevented when the outer circle is processed, and then the satisfactory processing accuracy can be obtained.

When processing aluminum alloy shell workpieces, it is recommended to use vacuum suction cups to obtain evenly distributed clamping force. During processing, use a small amount of cutting to process, and then effectively prevent workpiece deformation.

The editor concluded from the processing practice that the packing method can also be used in the processing of aluminum alloy shells. In order to increase the process rigidity of the shell workpiece, a medium can be filled inside the workpiece to reduce the large deformation of the workpiece during the clamping and cutting process. For example, pour the urea melt containing 3%-6% potassium nitrate into the workpiece, after finishing the processing, immerse the workpiece in water or alcohol, and then dissolve the filler and pour it out.

If there are multiple cavities on the aluminum alloy shell parts, it is not advisable to process one cavity by cavity one by one, because it is easy to cause uneven stress and deformation of the parts. Multi-layer processing is adopted, and each layer is processed as much as possible to all the cavities, and then the next layer is processed to make the parts uniformly stressed, and then achieve the purpose of reducing deformation.

The aluminum alloy shell workpiece is often deformed due to clamping during processing. In order to greatly reduce the deformation of the workpiece, it is possible to loosen the compression piece before the finishing process reaches the final scale to restore the workpiece to its original state. , And then perform a slight compaction, whichever is the only way to clamp the workpiece (completely based on personal experience), so as to ensure the ideal processing effect. The machining experience of the editor proves that the point of action of the clamping force is very good on the supporting surface, and the clamping force should act in the direction of good rigidity of the workpiece. Under the premise of ensuring that the workpiece does not loosen, the smaller the clamping force, the better.

In addition, when processing aluminum alloy shell workpieces, try not to let the milling cutter plunge directly into the part like a drill bit when processing the cavity, which will cause the milling cutter to have insufficient chip holding space and unsmooth chip removal, and then cause the part to overheat and expand. As well as the phenomenon of collapsed knife, broken knife and so on. Therefore, the editor recommends to drill the hole with a drill of the same size or one size larger than the milling cutter, and then mill it with a milling cutter, or use the CAM software to produce the spiral cutting program, and then reduce the deformation of the aluminum box shell workpiece to ensure the workpiece quality.

The editor believes that today, as the application range of aluminum alloy casings is expanding, as an aluminum alloy casing processing enterprise, it is necessary to improve the skill level of operators, and summarize different processing techniques for aluminum alloy casing processing according to different uses and working environments of different workpieces. And methods to effectively improve the processing quality of aluminum alloy shells.