A STUDY OF THE FORCES ACTING ON A SINGLE COAL CUTTER PICK:AN EXAMINATION OF A STANDARD PICK AND A STRAIGHT BAR, PICK CUTTING IN CWMTILLERY (GARW) COAL

摘要

The work described in the Report concerns laboratory invest-igations in which a groove was cut in specimens of Cwmtillery (Garw) coal, using a 'standard' forged pick and a straight bar pick with a tungsten carbide insert. The object of the work was to examine the effect of variations in cutting speed and depth of cut on pick performance. Measurements were made of the cutting force required, and the coal produced from the cut was weighed and sized.nIt was found that the cutting speed had no significant effect on the basic measurements of mean cutting force, total weight of coal, and weight of fines, over the range of speeds examined of 200 to 600 ft/min. Additionally, cutting speed did not signific¬antly influence the quantities derived from the basic measure¬ments, viz. energy consumption per unit weight of coal, percent¬age fines, and the degree of “breakout” from the geometric cut.