"REPORTER of the Association of Drilling Contractors" N 3, 2013

ANALYTICAL STUDY OF CUTTING AND SHEARING ACTION OF PDC BITS
Neskoromnykh, Vyacheslav V. – Dr.Tech.Sci., professor, head of the mining department of the Siberian Federal University, info@sfu-kras.ru
Borisov, Konstantin I. – Dr.Tech.Sci., senior lecturer of the drilling department of the Institute of Mineral Resources of the National Tomsk University of Technology, kibor@tomline.ru


Key words: PDC bits, wear resistance, rock behavior, shearing-cutting process.
The paper presents an analysis of a steady-state regime of shearing-cutting of rocks by PDC bits. It is shown that different types of rocks require different negative rake angle on the cutting edge of the bit, and negative rake angle should increase to the maximum (15-20º) if cutters are located closer to the center of the bit. Cutters’ diameter should decrease (with equal extension of cutters) from the centre and out. Engineers may use the research findings in their design work and for the purposes of optimization of PDC bit cutting structures.

 




 

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