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本文着重分析了钛合金ＴＣ４小孔攻丝困难的主要原因，在于钛合金材料本身的弹性模量低、工件弹性变形大引起的攻丝总扭矩中的摩擦扭矩太大，而标准丝锥的结构及几何参数又不适应钛合金这种特殊材料物理、化学、机械性能的要求。参照国外资料，我们设计、试制了齿形角修正了的丝锥（即齿形角 ，简称修正齿丝锥），它用轨迹法切成螺纹，所切螺纹仍为齿形角 的标准螺纹。 试验结果表明，用切削锥角 的Ｍ６修正齿丝锥并使用４９０１极压切削液，攻丝总扭矩比标准丝锥降低６０～７０％，攻制螺纹质量完全合乎要求，效果显著。此结构丝锥及４９０１切削液可在钛合金类加工材料上进行小孔攻丝时推广使用。
This article focuses on the analysis of titanium alloy TC4 holes tapping the main reason is that the titanium alloy material itself has a low elastic modulus, elastic deformation of the workpiece caused by the total torque tapping torque is too large, and the standard tap structure and Geometric parameters do not meet the titanium alloy of this special material physical, chemical, mechanical properties. With reference to foreign materials, we designed and piloted a taps modified tooth profile angle (ie, tooth profile angle, referred to as the modified tooth tap), it is cut into the thread track method, the cut thread is still the standard angle of the tooth profile. The test results show that using taper M6 to correct tooth taper and using 4901 extreme pressure cutting fluid, the total torque of tapping is reduced by 60 ~ 70% compared with that of standard tapping. The quality of tapping thread is totally satisfactory and the effect is remarkable. The structure of tap and 4901 cutting fluid can be used in titanium alloy tapping when processing materials.