This book，intencled for engineers in the field of rock bitdesigning，manufacturing and research as well as teachers andstudents disciplinarily related，is a description of the essential part ofthe above technical system with brief introductions to the relevantachievements by our counterparts in foreign countries SO that anoverall view of the current situation of rock bit operational mechanicsis provided． Due to the author’S limited source of scientific andtechnological information，errors or mistak

PREFACE
FOREWORD
Chapter 1 Introduction
1.1 A brief history and prospect of the development of rock bit
1.2 The progress of t he research an d design of rock bit
Chapter 2 The Geometry of The Rock Bit
2.1 The traditional geometry of rock bit
2.2 The fundament al equation s of the modern geometry of rock bit
2.3 The accurate calculation for t he clearance between the adjacent cones
2.4 The transitional zone at the lower en d of bore-hole
2.5 The geometry of the lower part of bit leg
Chapter 3 The Kinematics of The Rock Bit
3.1 The traditional kinematics of rock bit
3.2 The fundament al equation s of the velocity of bit teeth
3.3 The rot at ion of the roller
3.4 The number of teeth contacting with the bottom-hole
3.5 The track of teeth on the bottom-h ole and the lateral scraping of bit
3.6 The acceleration of bit teeth
Chapter 4 The Bearing System of The Rock Bit
4.1 The friction couple of t he bearing
4.2 The analysis for the bearing wear
4.3 The seal ring
4.4 The pressure balancing and lubricant reservoir compensating system PBLRCS
Chapter 5 The Experimental Study on The Interaction Between Bit and Rock
5.1 The axial penetration test by t he single tooth
5.2 The drilling test by t he w hole bit
5.3 The simulation test of the crater-forming process by t he bit teeth
5.4 The advanced approach for digitalized measurement and analysis of the bottom-hole pattern
5.5 The side cutting of t he bit an d the w ell-bore deviation
Chapter 6 The New Methodology for The Rock Bit Design
6.1 The main contents of the new design method
6.2 The distinct feature of the new design method
References