This paper also discusses bit parameter design to improve the economy of PDC bits, such as negative rake 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。

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XuanTou hold a second rise pressure design with the sword, and increase the heating device and side effect finished flat not hair Angle, improve quality shoes.

楦头撑台第二次上升压着设计配合扫刀加热装置，增进结帮效果使成品平坦不发角，提高鞋子品质。

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