Welcome to CDC stacks | Toward Development of a Hard-Rock Mining Machine-Drag Cutter Experiments ~n Hard, Abrasive Rocks; Bureau of Mines Report of Investigations -1987 RI 9131 - 10752 | National Institute for Occupational Safety and Health
Stacks Logo
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.
 
 
Help
Clear All Simple Search
Advanced Search
Toward Development of a Hard-Rock Mining Machine-Drag Cutter Experiments ~n Hard, Abrasive Rocks; Bureau of Mines Report of Investigations -1987 RI 9131
  • Published Date:
    1/1/1987
Filetype[PDF-9.54 MB]


This document cannot be previewed automatically as it exceeds 5 MB
Please click the thumbnail image to view the document.
Toward Development of a Hard-Rock Mining Machine-Drag Cutter Experiments ~n Hard, Abrasive Rocks; Bureau of Mines Report of Investigations -1987 RI 9131
Details:
  • Description:
    The Bureau of Mines conducted drag cutting experiments in hard, abrasive rock in an effort to extend the capabilities of an experimental kerf-core mining machine. The basic kerf-core mining machine cannot be used in hard, abrasive rocks because of the high wear experienced by the kerf cutters. These experiments were conducted in an effort to develop a method of preweakening the rock ahead of the kerf cutters in order to reduce the high cutting loads and hence the higher wear rates experienced by the cutters. The two "preweakening" techniques studied were indenting with mechanical wedges and single and double slotting with diamond saws. The best cutter force reduction achieved with mechanical indenting as 70 pct, whereas double slotting achieved force reductions of up to 99 pct. Conceptual designs of preweakening systems that could be retrofitted onto the basic kerfing cutterhead were developed for both the indenting and the slotting techniques. A high-energy impactor with wedge bit was used for the indenting method, and high-pressure water jets were used for the slotting method. A preliminary technical and economic analysis was performed for both of these full-scale systems to illustrate the methodology and to point out the important technical and economic factors that must be considered.

  • Supporting Files:
    No Additional Files
No Related Documents.
You May Also Like: