In daily life, aluminum alloy frames are widely used in separated aluminum alloy shells, industrial control computers and other intelligent equipment hardware shells. Aluminum alloys are favored by the electronics manufacturing industry because of their light weight and high strength. However, for the thinner aluminum alloy frame, it is easy to deform during processing, how to effectively reduce this problem? Here are a few ways to do this:
1. Reduce blank stress
The internal stresses of the blank can be partially eliminated by natural or artificial aging treatment and vibration treatment. In addition, pre-processing is also an effective method. For larger blanks, large deformation may occur due to the large machining allowance. Removing the excess part in advance not only reduces the subsequent processing distortion, but also releases some of the residual stress by leaving it for a period of time.
2. Optimize the clamping method
When machining thin-walled aluminum alloy frames, it is recommended to use vacuum suction cups to evenly distribute the clamping force and to process with a small amount of stock removal, thus effectively reducing deformation.
3. Adopt reasonable processing technology
In the process of high-speed milling, due to the large machining allowance and intermittent cutting, it is easy to produce vibration, which affects the machining accuracy and surface quality. Therefore, machining is usually divided into the following stages: roughing - semi-finishing - corner machining - finishing.
For aluminum alloy frames that require high precision, it is sometimes necessary to carry out secondary semi-finishing and then finishing.
1) After roughing, the workpiece is allowed to cool naturally to relieve some of the stress caused by machining to reduce deformation.
2) When finishing, a uniform machining allowance (generally 0.2~0.5mm) should be maintained to keep the tool in a stable state, so as to reduce machining deformation, improve surface quality, and ensure product accuracy.
4. Control the tool parameters and cutting amount
Selecting the appropriate tool parameters, such as tool radius, feed rate and cutting depth, can effectively reduce the heat accumulation during cutting and avoid the deformation of the aluminum alloy frame due to the increase in temperature. At the same time, the use of a suitable coolant can reduce the influence of cutting heat on the material and further improve the machining stability.
Through the above methods, the deformation of the aluminum alloy frame during CNC machining can be effectively reduced to ensure the accuracy and stability of the product.