This paper also discusses bit parameter design to improve the economy of PDC bits, such as negativerake Angle and side rotation Angle.
本文还介绍了为提高复合片钻头经济指标的钻头参数设计问题，如负前角，侧旋角等。
2
Their lower thermal conductivity and relatively higher under high speed cutting and negativerake Angle of heat generated by the compressive strength.
它们的更低的热导性和相对更高的承受高速切削和负前角所产生热量的抗压强度。
3
This error has influenced the precision of gear, especially, when negativerake Angle of gear-shaped cutter is used, the current design method has not reguired the profile precision.