Mechanics of Cutting and Boring. Part 6. Dynamics and Energetics of Transverse Rotation Machines

• Main Author: Mellor,Malcolm
• Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
• Format: Text
• Language: English
• Published: 1977
• Subjects: Machinery and Tools; *MACHINE TOOLS; *EXCAVATION; *BORES; *CUTTING TOOLS; KINEMATICS; DYNAMICS; ROCK; ICE; DISKS; ROTATION; CUTTING; TRANSVERSE; DRILLS; PERMAFROST; PE62719A; AST42; WU004; Ice; permafrost
• Online Access: http://www.dtic.mil/docs/citations/ADA045127; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA045127

The report deals with forces and power levels in cutting machines having a disc 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 of the material being cut. Power per unit working area is discussed, and data for existing machines are summarized. Power requirements for ejection of cuttings 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. (Author) See also Part 4, AD-A040 760.