γ-titanium aluminide alloy has the advantages of high temperature resistance,high performance of anti-oxidation effect, low-density, high specific strength and rigidity etc. But high strength, hardness and brittleness of the material also make processing difficultly. This problem is more acute in deep hole drilling.

We analyzed the cutting performance of γ-titanium aluminide and designed a deep-hole drills with appropriate tool material and geometric parameters herein.The experimental results show:(1)YG8 cemented carbide is the appropriate tool material for drilling γ-titanium aluminide. (2)small rake angle of external edge (γ_o=-1°) and big clearance angle of external edge (α_o is about 10°～12°) should be chosen.

γ-TiAl合金具有耐高温、抗氧化、密度低、比强度和比刚度高等特点,但其高强度、高硬度和高脆性也给机械加工带来了很大困难，这在深孔钻削中尤为突出。在研究γ-TiAl合金切削性能的基础上,针对γ-TiAl合金的特点,选用三种国内常用的硬质合金刀片,对γ-TiAl合金进行了深孔钻削试验,结果表明：YG8硬质合金较适合用于钻削γ-TiAl合金;钻头角度应选择零前角或者微负前角（γ_o=-1°）以及尽可能大的后角（α_o为10°～12°）。

&gamma, -TiAl合金, 深孔钻削, BTA深孔钻头, 硬质合金