Titanium alloy can be divided into: heat-resistant alloy, high-strength alloy, corrosion resistant alloy (ti-mo, ti-pd alloy, etc.), low-temperature alloy and special functional alloy (ti-fe hydrogen storage material and ti-ni memory alloy).
Although titanium and its alloy application history is not long, but because of its superior performance, it has won many honorary titles. The first to win the title is "space metal". It is light, strong and high temperature resistant, especially suitable for manufacturing aircraft and a variety of spacecraft. About three-quarters of the titanium and titanium alloys produced in the world are used in the aerospace industry. Many parts that used aluminum alloy have been converted to titanium alloy.
Titanium alloy is mainly used in aircraft and engine manufacturing materials, such as forging titanium fan, compressor disc and blade, engine cover, exhaust device and other parts and aircraft girders and other structural frames. The spacecraft mainly USES titanium alloy high specific strength, corrosion resistance and low temperature resistance performance to manufacture various pressure vessels, fuel tanks, fasteners, instrument binding, frame and rocket shell. Artificial earth satellite, lunar module, manned spacecraft and space shuttle also use titanium alloy plate welding.
First of all, titanium alloy has a low thermal conductivity, which is only 1/4 of that of steel, 1/13 of aluminum and 1/25 of copper. Because the cutting area heat dissipation is slow, not conducive to thermal balance, in the cutting process, heat dissipation and cooling effect is very poor, easy to form high temperature in the cutting area, after processing parts deformation resilience, resulting in cutting tool torque increases, cutting edge wear fast, durability reduction.
Secondly, the low thermal conductivity of titanium alloy, so that the cutting heat production in the small area near the cutting tool is not easy to send out, the front cutting surface friction is increased, not easy to chip discharge, cutting heat is not easy to send out, accelerate tool wear. Finally, the titanium alloy has high chemical activity, which is easy to react with the tool material when it is processed at high temperature, forming dissolution and diffusion, resulting in adhesion, burning and breaking of the tool.
