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Determination of bit forces encountered in hard rock cutting for application to continuous miner design.

Authors
Demou-SG; Olson-RC; Wingquist-CF
Source
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 8748, 1983 Mar; :1-24
Link
NIOSHTIC No.
10001874
Abstract
Drag bit cutting tests were conducted chiefly to determine bit forces encountered in rock types representing a range of compressive strength and hardness and thus enable the design engineer to estimate a continuous miner's performance in a range of rock types. Testing was carried out on the Bureau of Mines uniquely designed, instrumented rock cutting device (RCD). This device can make 3-ft-long cuts at various depths and speeds to approximate full-scale drag bit cutting by continuous miners. Point attack and cutter bits were tested on four rock types ranging in compressive strength from 7,200 psi (trona) to 29,600 psi (Valders white rock). Cutting tests were made at depths up to 1 in and speeds up to 70 in/sec. Data included normal and cutting forces, groove depth, groove width, and weight of rock broken. The effect of varying the cutting speed was determined, and specific energies were calculated for the various conditions. The bit wear was also observed.
Keywords
Mines-Excavations; Mining-equipment; Drag-bits; Cutting-tools; Rock-excavation; Evaluation
Publication Date
19830301
Document Type
IH; Report of Investigations
Fiscal Year
1983
NTIS Accession No.
PB83-197574
NTIS Price
A03
Identifying No.
RI-8748
NIOSH Division
TCRC
Source Name
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 8748
State
MN
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