Titanium alloy has the characteristics of high strength, small specific gravity, corrosion resistance, low temperature resistance and high temperature resistance. According to the structure after annealing, it can be divided into α-phase titanium alloy, β-phase titanium alloy, and α-β-phase titanium alloy. The α-phase titanium rectangular bar alloy (TA type) cannot be strengthened by heat treatment, so the room temperature performance is not high, it has medium plasticity, and the machinability is acceptable. The β-phase Grade 3 Pure Titanium Sheet alloy can obtain higher room temperature performance through quenching and aging treatment. When α β phase titanium alloy (TC type) is processed, the contact length between the chip and the front is short, and the cutting force acts near the cutting edge. Due to the small thermal conductivity, the temperature of the cutting edge is high, which accelerates the wear of the drill bit, and due to work hardening The phenomenon is more serious, and the elastic coefficient is smaller, so the shrinkage of the drilled hole is larger, which also affects the life of the drill bit.
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