TRACE EQUATION AND METHODS FOR COMPUTING CUTTING PARAMETERS O OF PDC BITS

It is necessary to calculate the cutting area,cutting volume,and contact arc of PDC bit cutters in bit’ design and analysis.In this paper,the Trace Equation and Methods for Computing Cutting Parameters of PDC Bits is studied on the basis of the theories of three dimensional geometry and the numerical method.The coordinate systems to describe the location and moving trace of PDC bit down hole are build.The equations of moving trace and cutting trace of bottom hole PDC bits are established.The methods of cutting area,cutting volume and the length of cutting arc,of PDC cutters are given.These equations and methods are valuable for PDC bits design and analysis.