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Analysis of mechanical tool force reductions when using water-jet assist.

Authors
Evans RJ
Source
Water-jet-assisted cutting. Proceedings: Bureau of Mines Open Industry Meeting, Pittsburgh, Pennsylvania, June 21, 1984.Taylor CD; Evans RJ, eds. Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9045, 1985 Jan; :21-28
Link
NIOSHTIC No.
10002303
Abstract
Water-jet-assisted cutting is the synergistic combination of a mechanical pick and a directed moderate-pressure water jet which greatly facilitates the cutting process. The water jet assists the mechanical pick by lubricating the cutting process, by cleaning the crushed zone directly in front of the bit to reduce friction, by cooling the mechanical tool to improve bit life, and by exploiting cracks close to the bit to promote chip fragmentation. An In-Seam Tester, which is aa hydraulically activated single pick instrumented to measure and record cutting forces, was designed and fabricated by the Bureau of Mines to obtain design data for a rotary drum cutting system using moderate-pressure jets (3,000 to 10,000 psi). Data are presented for cutting trials in a simulated coal block, underground in the Pittsburgh coal seam, and on test blocks of sandstone and limestone for water-jet-assisted and dry cutting. Data are presented which indicate that pick forces are significantly reduced when using water-jet-assisted cutting.
Keywords
Hydraulic jets; Underground mining; Rotary drill bits; Cutting tools; Jet drills; Mining industry; Drilling; Mining equipment
Publication Date
19850101
Document Type
IH Conference/Symposia Proceedings
Editors
Taylor CD; Evans RJ
Fiscal Year
1985
NTIS Accession No.
NTIS Price
NIOSH Division
PRC
Source Name
Water-jet-assisted cutting. Proceedings: Bureau of Mines Open Industry Meeting, Pittsburgh, Pennsylvania, June 21, 1984
State
PA
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