Features of CNC Machining Aluminium Parts
August 24,2022
As the level of CNC machining increases, the precision of aluminium parts crafts is becoming more and more stringent. This also leads to improved CNC machining processes for aluminium alloys. It is a mechanical machining method that uses CNC machine tools for part machining processes. And a method that uses digital information to control the displacement of parts and tools.
Features OF CNC machining of aluminium parts
Low hardness of aluminium alloys
Compared to other metal materials, aluminium alloys have a low hardness and good cutting properties. However, it is characterised by a low melting point and high ductility. It is easy to melt on the finishing surface or tool, and easy to produce burrs and other shortcomings.
Of course, heat-treated or die-cast aluminium alloys also have a high hardness. The general HRC hardness of aluminium sheets is generally below HRC 40 degrees. Therefore, in the case of machining aluminium alloys, the load on the tool is low. In addition, the excellent thermal conductivity of aluminium alloys means that the cutting temperature of aluminium alloy milling is low, enabling higher milling speeds.
Low plasticity of aluminium alloys
The low plasticity and low melting point of aluminium alloys result in poor chip removal and high surface roughness when CNC machining aluminium alloy parts. In fact, the CNC machining of aluminium alloy parts is mainly due to the poor effect of the knife and roughness. If you solve the two problems of fixed knife edge and the quality of the machined surface, you can solve the problems of aluminium alloy machining.
The tool is easy to wear
Because of the use of unsuitable tool materials, there are more cases of accelerated tool wear due to problems such as bar edges and chip discharge. If a tool with a negative leading edge shape is used, fusion dressing tends to occur on the cutting edge. This makes machining more difficult while at the same time causing problems such as poor surface roughness and poor machining accuracy due to chip build-up.
It is therefore important to choose a tool that minimises cutting temperatures, has good roughness and can discharge chips smoothly. Tools with a sharp, positive cutting edge and sufficient chip evacuation space are most suitable.
Conclusion
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