Views: 0 Author: Site Editor Publish Time: 2021-11-05 Origin: Site
There are many reasons for the deformation of CNC turning aluminum parts, which are related to the material, the shape of the part, and the production conditions. There are mainly the following aspects: deformation caused by internal stress of CNC turning aluminum blanks, deformation caused by cutting force and cutting heat, and deformation caused by clamping force.
Here is the content list:
l Process measures to reduce processing distortion
l Reasonable selection of tool geometry parameters
To reduce the internal stress of CNC turning aluminum blanks, the use of natural or artificial aging and vibration treatment can partially eliminate the internal stress of CNC turning aluminum blanks. Pre-processing of CNC turning aluminum parts is also an effective process method. For CNC turning aluminum parts with fat heads and big ears, due to the large margin, the CNC turning aluminum parts will deform greatly after processing. If the excess parts of the CNC turned aluminum parts are pre-processed and the margins of each part are reduced, not only can the processing deformation of the subsequent processes of CNC turned aluminum parts be reduced, but also a part of the internal stress can be released after the pre-processing is placed for some time.
Improve the cutting force of cutting tools for CNC turning aluminum parts. The material and geometric parameters of the tool have an important influence on cutting force and cutting heat. The correct selection of CNC turning tools for aluminum parts is essential to reduce the deformation of CNC turning aluminum parts.
①Rake angle: Under the condition of maintaining the strength of the cutting edge, the rake angle should be appropriately selected to be larger. On the one hand, it can grind the sharp cutting edge, and on the other hand, it can reduce the deformation of CNC turning aluminum parts, so that the chip evacuation is smooth, and the cutting force and cutting temperature. Never use negative rake angle cutters to cut CNC turning aluminum parts.
②Relief angle: The size of the relief angle has a direct effect on the wear of the flank surface and the surface quality of CNC turning aluminum parts. Cutting thickness is an important condition for selecting the relief angle. When CNC turning aluminum parts for rough milling, due to the large feed rate, heavy cutting load, and large heat generation, good heat dissipation conditions of the tool are required. Therefore, the relief angle should be selected smaller. When CNC turning aluminum parts are finish milling, the cutting edge is required to be sharp, to reduce the friction between the flank face and the surface of the CNC turning aluminum parts, and to reduce the elastic deformation. Therefore, the clearance angle should be selected larger.
Strictly control the wear standard of CNC turning tools for aluminum parts. After the tool is worn, the surface roughness value of CNC turning aluminum parts increases, and the cutting temperature rises, and the deformation of CNC turning aluminum parts increases accordingly. Therefore, in addition to the selection of tool materials with good wear resistance, the tool wear standard should not be greater than 0.2mm, otherwise CNC turning aluminum parts are prone to buildup. When cutting, the temperature of CNC turning aluminum parts should generally not exceed 100°C to prevent deformation.
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