In the current era of numerical control and information, numerical control machine tools are fundamentally required to acquire competitiveness and improve product quality, and aluminum alloy cnc machining is indispensable for high-end intelligence. If you want to reach this goal, you need to improve the aluminum alloy cnc machining technology. What are the aluminum alloy cnc machining technologies? From which aspects can we improve? YIXIN PRECISION METAL AND PLASTIC LTD is a professional aluminum alloy cnc machining customization manufacturer.
1. Elimination of prescription
Aging elimination method Aging elimination method is a traditional method to reduce quenching residual stress. As aluminum alloy materials, especially aviation aluminum alloy materials, are very sensitive to temperature, the increase of aging temperature will obviously reduce the strength index, resulting in excessive precipitation of MgZn2 and other strengthening phases and over-aging. Therefore, the aging treatment after quenching is usually carried out at a lower temperature (less than 200-250), thus affecting the stress relief effect (only 10-35%)
2. Mechanical stretching method
The principle of stress relief by mechanical stretching method is to apply a certain amount of permanent tensile plastic deformation to the quenched aluminum alloy plate along the rolling direction, so that the tensile stress and the original quenching residual stress will be superposed and plastic deformation will occur, and the residual stress will be relieved and released. Relevant research results show that mechanical stretching method can eliminate more than 90% of residual stress. However, this method is only suitable for parts with simple shapes, and has higher requirements on the uniformity of the structure of aluminum alloy plates before stretching, and is mostly used in aluminum processing plants.
Die cold pressing method is to eliminate residual stress in aluminum alloy die forgings with complex shapes by strictly controlled limited cold shaping in a special finishing die. In fact, the term "die pressing" is not exact enough because its main mechanism is to make the local material of aluminum alloy die forgings subject to "stretching" or "compression". When the finishing die is pressed down, the finishing punch is embedded on the draft angle of the end face and the edge (rib) strip of the aluminum alloy die forging, which actually causes the web part of the die forging to produce a "stretching" effect. Therefore, this method is to adjust rather than eliminate the overall stress level of the parts. It can release the residual stress in some parts of the aluminum alloy die forging and increase the residual stress in other parts at the same time.
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