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Why aluminum alloy processing deformation, how to solve, how to choose aluminum alloy milling cutter?
Release time:
2021/11/16
In the aircraft structure, in order to reduce its own weight, a large number of thin-walled parts of aluminum alloy materials are used, but the thermal expansion coefficient of aluminum alloy parts is relatively large, and it is easy to deform when processing thin-walled aluminum alloy, especially when the free forging blank is used, the processing workload is large, so its deformation problem is more serious. Shenzhen Hanchuan company to analyze the causes and solutions of aluminum alloy processing deformation, hoping to help the staff.
1. Causes of processing deformation
There are many reasons for the deformation of aluminum alloy processing, which are related to the material, part shape and production conditions. There are mainly the following aspects: the deformation caused by the internal stress of the blank, the deformation caused by the cutting force, the deformation caused by the cutting heat, and the deformation caused by the clamping force.
2. Process measures to reduce processing deformation
(1) Reduce the internal stress of the blank by natural or artificial aging and vibration treatment, can partially eliminate the internal stress of the blank. Pre-processing is also an effective process method. For the blank of fat head and big ear, due to the large allowance, the deformation after processing is also large. If the excess part of the blank is processed in advance and the allowance of each part is reduced, not only can the deformation of the later process be reduced, but also a part of the internal stress can be released after being processed in advance for a period of time.
(2) Improve the cutting ability of the tool The material and geometric parameters of the tool have an important influence on the cutting force and cutting heat. The correct selection of the tool is essential to reduce the deformation of the parts.
Reasonable selection of tool geometry parameters. Front angle: under the condition of maintaining the strength of the blade, the front angle should be selected larger. On the one hand, it can grind out a sharp edge, and on the other hand, it can reduce the cutting deformation, make the chip removal smoothly, and then reduce the cutting force and cutting temperature. Never use negative rake angle cutters.
Back angle: The size of the back angle has a direct impact on the wear of the flank and the quality of the machined surface. Cutting thickness is an important condition for selecting the relief angle. During rough milling, due to the large feed rate, heavy cutting load, and large heat generation, the tool is required to have good heat dissipation conditions. Therefore, the rear angle should be smaller. When milling, the cutting edge is required to be sharp, reduce the friction between the flank and the machined surface, and reduce the elastic deformation. Therefore, the rear angle should be selected to be larger.
Helix angle: In order to make the milling smooth and reduce the milling force, the helix angle should be as large as possible.
Main deflection angle: Appropriately reducing the main deflection angle can improve the heat dissipation conditions and reduce the average temperature of the processing area.
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