Cutting experiment of the picks with different conicity and carbidetip diameters

Abstract

To study the cutting property of the different picks,five type picks were developed.Based on this,the experiments of cutting property of the five different picks were carried on the cutting testbed of the coal and rock,and the statistic(the maximum,the minimum,the mean,the variance) of the cutting torques of the five picks were analyzed.The cut particles were graded for studying the lump coal percentage of the different picks,and the law of the cutting lumps distribution was studied.The results indicate that the cutting force and the lump coal percentage are change along with the changes of the carbidetip diameter and pick conicity for different types picks.The load fluctuation increases,the cutting force and the lump coal percentage decrease along with the decreasing of the carbidetip diameter and the increasing of the pick conicity for the step picks.The relation of the cutting force and the pick conicity and the carbidetip diameter obeys index distribution,and the law of the cutting lumps distribution obeys index distribution.When the pick conicity is bigger and the carbidetip diameter is smaller,the cutting force is smaller,the load fluctuation is smaller and the lump coal percentage is bigger for the coniform picks.