【摘要】 采用等距螺旋线和变距螺旋线作为ＰＤＣ钻头的布齿基线，解决了ＰＤＣ钻头设计中的布齿问题；详细介绍了这两类螺旋线布齿的方法及各应用实例．更多还原

【Abstract】 The helix model may be used as a fundamental model in placing cutter in thedesign of PDC bit. The paper in detail discusses and introduces this model and application ofthe method.更多还原