Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/9518
Title: Mechanics of cutting and boring : part VI, dynamics and energetics of transverse rotation machines
Authors: Mellor, Malcolm.
Keywords: Boring machines
Drilling machines
Machine design
Excavating machines
Permafrost excavation
Permafrost
Frozen ground
Excavation
Rock cutting
Ice cutting
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: CRREL report ; 77-19.
Description: CRREL Report
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.
Rights: Approved for public release; distribution is unlimited.
URI: http://hdl.handle.net/11681/9518
Appears in Collections:CRREL Report

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