It is difficult to Turning Titanium .Titanium alloy thermal conductivity is very poor, coupled with the chip and tool contact length is very short, is not conducive to the export of cutting heat, so that the cutting edge area temperature is high, about twice as high as cutting 45 steel. In addition, the tool wear is also very serious. As the chip and the tool front contact length is only cutting steel 1/3 ~ 1/4, resulting in cutting force concentrated in the cutting edge near, the tool is easy to collapse. Therefore cutting titanium alloy tool material, such as the use of high-speed steel, should be used with cobalt, aluminium or high vanadium high-speed steel.So how to Turning Titanium?

The tool and material selection for turning titanium

In order to improve the cutting edge strength and heat dissipation capacity, it is advisable to choose a smaller front angle and edge inclination angle. As the titanium alloy cutting has been processed surface elastic recovery, so the back angle should take a larger value. Tool tip should be used to round the transition edge, cutting edge is not allowed to have burrs, small notches or cracks and other defects, the roughness of the tool surface should be within Ra0.2μm, to ensure smooth chip discharge and avoid chipping.

Selection of tool geometry parameters for turning titanium

The speed of turning titanium should not be too high, the back draft can be larger and the feed should be appropriate. Too much feed will cause the cutting edge to burn; too little feed will cause the cutting edge to wear too fast when machining the hardened layer. When CNC turning titanium alloys, anti-rust emulsions or extreme pressure emulsions can be used for cooling and lubrication.

Cutting dosage selection for turning titanium

Tool material YG8, workpiece material TC4, tool geometry front angle = 5°, back angle = 10°, main offset angle = 75°, secondary offset angle = 15°, tip radius = 0.5mm, depth of cut = 1mm, dry cutting. If cutting fluid is used, the cutting speed in the table can be increased appropriately.