Characteristics of cnc aluminum alloy machining and cutting processability

2021/11/10

Since the people's living standard has improved, the precision of aluminum parts crafts has become more and more strict, thus improving the aluminum alloy cnc machining process. The demand for aluminum alloy products is also rising. There are more and more people doing aluminum alloy machining, so the following I am going to introduce to you about the characteristics of cnc aluminum alloy machining and cutting machinability, welcome to read!
 
The characteristics of cnc aluminum alloy machining.
 
First, the aluminum alloy hardness is low.
 
Aluminum alloy hardness is lower than titanium alloy and hardened steel, of course, heat treatment or die-casting aluminum alloy also has a higher hardness. Ordinary aluminum plate HRC hardness is usually lower than HRC40. so, in aluminum alloy machining, the tool load is small. In addition, aluminum alloy has good thermal conductivity, thus the milling temperature is lower and the milling speed can be improved.
 
Second, the plasticity of aluminum alloy is low
 
The plasticity of the alloy is low, and the melting point is also low. When machining aluminum alloy, the problem of bonding edge is very serious, the chip removal is poor, and the surface roughness is also high. In fact machining aluminum alloy, the main problem is that the cutting edge and roughness effect are not good. If we can solve the two problems of fixed edge and processing surface quality, we can solve the problem of machining aluminum alloy.
 
Third, the tool is easy to wear
 
Due to the use of inappropriate tool material, when machining aluminum alloy, the tool wear is accelerated due to the bar edge, debris and other problems.
Aluminum alloy machining
Aluminum alloy cutting machinability.
 
As the processing of industrial aluminum alloy parts has high requirements on the knife, especially for aviation aluminum alloy, it must meet the need for high quality processing while meeting high cost performance. Because carbide tools have very sharp cutting edges and grooves, their cutting forces are small in aluminum alloy finishing, and they have the advantages of large chip space and smooth chip removal, so the integral carbide tools have gradually replaced the traditional high-speed steel tools.
 
Because the strength and hardness of aluminum alloy are relatively low, the plasticity is small, the wear on the tool is small, and the thermal conductivity is high, so that the cutting temperature is low, so the cutting processability of aluminum alloy is good, it is an easy-to-machine material, the cutting speed is high, and it is suitable for high-speed cutting. However, the lower the melting point of aluminum alloy, the higher the temperature, the higher the plasticity, and the greater the interface friction under high temperature and pressure. It is easy to stick to the knife, especially in the annealed state, and it is not easy to get the surface small roughness. In order to make the surface of the workpiece smooth, a combination of rough cutting and fine cutting should be used, because various qualified workpieces always have some oxidation layer, causing greater tool wear. The above requirements can be achieved by using polished sharp tools for cutting and machining.
 
The silicon content below 12% can be adopted ISOK10-K20 tungsten steel tools, silicon content in more than 12% that is adopted diamond tools, aluminum alloy processing should not be adopted Al2O3 ceramic tools, aluminum alloy processing should not be adopted Al2O3 ceramic tools, cutting due to aluminum oxide chips can be adopted ISOK10-K20 tungsten steel tools, silicon content in ISOK10-K20 tungsten steel tool on, aluminum alloy processing is not suitable for Al2O3 ceramic tool. In the process of ultra-precision machining, once the formation of chip tumor will replace the cutting edge for cutting, the sharpness of the tool blade has lost its significance. Moreover, the bottom of the tumor is relatively stable, while the top is very unstable and highly susceptible to rupture, and after the rupture is discharged together with the chips, another part remains on the processing surface, making the processing surface rough, which will also directly lead to the roughness of the processing surface being cut.
 

Thanks for reading, the above is the introduction of the characteristics of cnc aluminum alloy machining and cutting machinability. 

If you want to know more detailed matters about aluminum alloy machining, welcome to call for more details for your service.