In view of the problem of deformation in the production and processing of aluminum alloy plate, the problem of deformation will be different according to the appearance of raw materials, processing surplus and production and processing methods. To deal with this problem, it is necessary to find the source of deformation. There are three kinds: internal force, temperature, internal stress and temperature.
The reason of cutting deformation of aluminum alloy profile workpiece is as follows:
There are many reasons for the deformation of aluminum alloy profile parts, which are related to the material, part appearance, processing technology standard and the characteristics of cutting oil. The key points are as follows: deformation caused by internal stress of hair embryo, deformation caused by cutting force and cutting heat, deformation caused by clamping force.
The processing countermeasures to reduce the deformation of workpiece are as follows
1. Reduce the internal stress of hair embryo
The internal stress can be partly removed by using aging and vibration solution or pre-processing technology, and the deformation of the workpiece with large capacity is also large. If the unnecessary part of the hair embryo is removed in advance and the capacity of each part is reduced, not only the deformation of the later process can be reduced, but also the internal stress can be released after a period of time.
2. Main parameters of useful tool geometry
Rake angle: under the standard of maintaining the compressive strength of the cutting edge, the rake angle should be appropriately larger. On the one hand, it can grind the sharp edge, and in addition, it can reduce the cutting deformation to make the milling surface complete, thus reducing the cutting force and cutting temperature.
Back angle: the size of back angle has immediate harm to the damage of back edge and process performance. In rough milling, because of the high cutting speed, heavy cutting load and high calorific value, it is required that the heat dissipation standard of tool heat pipe is good, so the back angle should be selected smaller. In finish milling, the blade should be sharp, and the friction between the back edge and the surface can reduce the ductility deformation, so the back angle should be larger.
Helix angle: in order to make the cutting stable and reduce the cutting force, the helix angle should be larger as far as possible.
Main inclination angle: reducing the main inclination angle can improve the heat dissipation standard of heat pipe and reduce the average temperature.
3. Improve the tool structure
Reduce the number of turning tool teeth and increase the space of chip chamber. Because the plastic deformation of aluminum alloy material is very large, the cutting deformation is very large, and a large space for chip holding room is needed. Therefore, it is better to have a large half diameter at the bottom of chip holding groove and a small number of turning tool teeth.