Usually the problems that need attention in the process of rolling and heat treatment of titanium plates

The thermal conductivity of titanium alloy is small, about 1/3 of that of iron, and the heat generated during machining is difficult to release through the workpiece; at the same time, because the specific heat of titanium alloy is small, the local temperature rises quickly during processing. Therefore, it is easy to cause the tool temperature to be very high, sharply wear the tool tip, and reduce the service life. Experiments have proved that the temperature of the tip of the tool for cutting titanium alloy is 2-3 times higher than that of cutting steel. Thermal conductivity, elastic modulus, chemical activity, alloy type and microstructure are the main factors affecting the machining performance of titanium alloys. The low modulus of elasticity of titanium alloy makes the machined surface easy to spring back, especially the processing spring back of thin-walled parts is more serious, which is easy to cause strong friction between the flank face and the machined surface, thereby wearing the tool and chipping. Titanium alloys have strong chemical activity, and can easily interact with oxygen, hydrogen and nitrogen at high temperatures, increasing their hardness and decreasing plasticity. It is difficult to mechanically process the oxygen-rich layer formed during heating and forging. Titanium alloys have different alloy compositions and different processing properties. In the annealed state, a-type titanium alloy has better mechanical processing performance; a+β-type titanium alloy takes the second place; β-type titanium alloy has high strength and good hardenability. But the machining performance is the worst.

There are many machining methods for titanium alloys, mainly including: turning, milling, boring, drilling, grinding, tapping, sawing, EDM and so on.
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