Call number:
ZSP-201-81/26
In:
CRREL Report, 81-26
In:
Mechanics of cutting and boring, Part 7
Description / Table of Contents:
Abstract: This report deals with force, torque, energy and power in machines such as drills and boring devices, where the cutting head rotates about a central axis while penetrating parallel to that axis. Starting from a cosideration of the forces developed on individual cutting tools, or segments of cutters, the thrust and torque on a complete cutting head is assessed, and simple relationships between thrust and torque are derived. Similarly, the energy and power needed to drive the cutting head arc estimated and related to tool characteristics. Design characteristics of existing machines are compiled and analyzed to give indications of thrust, torque, power, effective tool forces, nominal thrust pressure, power density, and specific energy.
Type of Medium:
Series available for loan
Pages:
iv, 38 Seiten
,
Illustrationen
Series Statement:
CRREL Report 81-26
URL:
https://hdl.handle.net/11681/9342
Language:
English
Note:
CONTENTS
Abstract
Preface
Foreword
Introduction
Terminology
Tool forces
Parallel motion tools
Indentation tools
Head thrust, thrust per unit width, and nominal head pressure
Power and power density
Torque
Specific energy
Efficiency and performance index
Power requirements for clearance of cuttings
Minimum power requirements for lifting cuttings in a vertical hole
Power consumption and efficiency in continuous-flight augers
Air circulation
Mud circulation
Literature cited
Appendix A: Vertical conveyance by continuous-fiight augers
Appendix B: Surface areas on a helical flight and its stem
Location:
AWI Archive
Branch Library:
AWI Library
