Performance Analysis of Two Different Conical Picks Used in Linear Cutting Operation of Coal

This paper examines linear cutting operation of coal samples by using two kinds of conical picks, each made of different materials. The first one is the conventional pick. It has an abrasive-resistant WC-Co conical tip. The second tool has newly been developed by using cast iron mixed with 21% (by weight) mild steel. The tip of the newly developed pick has been coated with an alloy LH710 (hardness 40 RC). Coal sample was cut linearly by using the picks at different tilt angles. The most optimum tilt angle was selected on the basis of two criteria: (1) the amount of coal removed and (2) the temperature generated during coal cutting. A comparative analysis of both the picks has been carried out on the basis of these findings. A combined multiple attribute decision-making method has also been used to select the best tilt angle and to simultaneously corroborate the results obtained by the experiments. After linear cutting of coals, a brief wear analysis of both the tools has been performed to compare their deteriorated condition.