What are the most difficult materials for machining?

SCZY LTD is one of the leading manufacturers for Precision Machining Parts, CNC Machining Parts, CNC Milling Parts, etc. What are the most difficult materials for machining? With the vigorous development of aerospace, petroleum, chemical, weapon and atomic energy industries, various difficult-to-machine materials have also been widely used, among which stainless steel, titanium alloy, hardened steel and other materials are the most representative.

1. Stainless steel
Stainless steel is widely used, but stainless steel has high work-hardening properties. During the cutting process, the material to be processed will undergo plastic deformation; the thermal conductivity of stainless steel is low, the chips carry less heat during cutting, and the temperature of the cutting point rises, resulting in cutting tools. The life is shortened; at the same time, the affinity of stainless steel is large, and it is easy to generate built-up edge on the tool tip and attachment on the flank surface, thereby reducing the precision of the machined surface.

2. Titanium alloy
The machinability of titanium alloys is as follows: low density, poor thermal conductivity, and the cutting heat is not easily diffused during cutting, resulting in very short tool life. Titanium alloy has a large affinity; it has high chemical activity and is easy to have affinity with the metal in contact, resulting in increased adhesion, diffusion, and tool wear; titanium alloy has a low elastic modulus and large elastic deformation, which will make the machined surface and the back tool. The contact area of the surface is large and the wear is serious.

3. Hardened steel material

The main features are high hardness, high strength, poor plasticity and thermal conductivity. During the cutting process, the contact length between the chip and the rake face is short, so the cutting force and cutting temperature are concentrated near the cutting edge, which is easy to cause tool wear and chipping.

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