Call number:
ZSP-201-77/19
In:
CRREL Report, 77-19
In:
Mechanics of cutting and boring, Part VI
Description / Table of Contents:
Abstract: The report deals with forces and power levels in cutting machines having adisc or drum that rotates about an axis perpendicular to the direction of advance. The forces on individual cutting tools are related to position on the rotor and to characteristics such as tool layout, rotor speed, rotor size, machine advance speed, and rotor torque. Integration leads to expressions for force components acting on the rotor axis, taking into account tool characteristics, cutting depth of the rotor, and rotor torque. These provide estimates of tractive thrust and thrust normal to the primary free surface. For self-propelled machines, this leads to considerations of traction, normal reaction, weight and balance, and power/weight ratios. Specific energy consumption is analyzed and related to machine characteristics and strength ofthe material being cut. Power per unit working area is discussed, and data for existing machines are summarized. Power requirements for ejection ofcuttings are analyzed, and the hydrodynamic resistance on underwater cuttings is treated. A number of worked examples are given to illustrate the principles discussed in the report.
Type of Medium:
Series available for loan
Pages:
vii, 36 Seiten
,
Illustrationen
Series Statement:
CRREL Report 77-19
URL:
https://hdl.handle.net/11681/9518
Language:
English
Note:
CONTENTS
Abstract
Preface
Foreword
Introduction
Terminology
Forces on individual cutters
Torque force and tool force
Forces on the rotor axis
Tractive thrust and down thrust
Alternative tool force formulations
Vehicle traction
Power/weight ratio
Weight and balance
Force, torque, speed and power
Specific energy
Efficiency and performance index
Power density
Power requirements for ejection of cuttings
Hydrodynamic resistance in underwater cutting
Location:
AWI Archive
Branch Library:
AWI Library
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