Aluminum parts processing technology to solve the problem of aluminum parts processing deformation（3）

Shenzhen aluminum parts processing manufacturers summarized the technical measures and operating skills to reduce the deformation of aluminum processing

　　There are many reasons for the deformation of aluminum parts, which are related to the material, the shape of the parts, and the 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 and cutting heat, and the deformation caused by the clamping force.

　　Technical measures to reduce processing deformation

　　 1. Reduce the internal stress of hair culture

　　Natural or artificial aging and vibration treatment can partially eliminate the internal stress of the blank. Pre-processing is also an effective process. Due to the large margin, the blank with fat ears has large deformation, so the deformation after processing is also large. If the excess part of the blank is pre-processed and the remaining part of the part is reduced, not only can the processing deformation of the subsequent process be reduced, but also a part of the internal stress can be released after being pre-processed 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. Proper selection of the tool is essential to reduce the machining deformation of the part.

　　 (1) Reasonable selection of tool geometry parameters.

　　①Front angle: Under the condition of maintaining the strength of the blade, the rake angle should be properly selected. On the one hand, the sharp edge can be ground, and the cutting deformation can be reduced, so that the chip evacuation is smooth, thereby reducing the cutting force and cutting temperature. Never use negative rake tools.

　　②Back angle: The size of the back angle has a direct impact on the wear of the flank and the quality of the processed surface. Cutting thickness is an important condition for choosing the relief angle. During rough milling, due to the large feed, heavy cutting load, and large heat generation, the tool requires good heat dissipation conditions. Therefore, the back angle should be selected to be smaller. When fine milling, the cutting edge is required to be sharp, to reduce the friction between the flank face and the processed surface, and to reduce the elastic deformation. Therefore, the back angle should be selected larger.

　　 ③ Helix angle: In order to make milling stable and reduce the milling force, the helix angle should be selected as large as possible.

　　 ④ The main declination angle: Appropriately reducing the main declination angle can improve the heat dissipation conditions and make the average temperature of the processing area drop.

　　 (2) Improve the tool structure.

　　 ①Reduce the number of cutter teeth and increase the chip space. Due to the greater plasticity of the aluminum parts, the larger the cutting deformation during processing, the greater the chip-retaining space. Therefore, the radius of the chip-receiving groove bottom should be large and the number of cutter teeth should be small.

　　②Fine grinding of the teeth. The roughness value of the cutting edge of the cutter tooth should be less than Ra=0.4um. Before using a new knife, you should use a fine whetstone to lightly grind a few times in front of and behind the teeth to eliminate the burrs and slight jagged lines that remain when sharpening the teeth. In this way, not only can the cutting heat be reduced but also the cutting deformation is relatively small.

　　 ③ Strictly control the tool wear standard. After the tool wears, the roughness value of the workpiece surface increases, the cutting temperature rises, and the deformation of the workpiece increases accordingly. Therefore, in addition to choosing a tool material with good wear resistance, the tool wear standard should not be greater than 0.2 mm, otherwise it is easy to produce built-up edge. When cutting, the temperature of the workpiece should generally not exceed 100°C to prevent deformation.