Numerical Simulation Of The Mechanical Behavior On Conical Pick Cutting Coal

Aimed at investigating pick cutting method with a higher reliability, lowerenergy consumption, quantitatively analyzing the mechanical relationship betweenpick and coal rock interaction, and reseaching the intrinsic relationships betweenability of picks’ breaking coal rock and related factors, this paper studys on themechanical properties of pick cutting coal rock, based on the test, theoretical analysisand simulation.The paper establishes a coal cutting test-bed based on the similarity theory,development of the mathematical model of pick cutting coal according to the shearercutting theory and the maximum tensile stress theory, the description of the cuttingforce theory model under symmetric cutting slots and asymmetric cutting slots onpicks. The nonlinear dynamic contact process of the conical pick to break coal rockwith straight and rotary line is simulated through extended linear Drucker-Pragerplastic constitutive model and the coal rock failure criteria based on the equivalentplastic strain and the dissipation of energy using ABAQUS. The gradient andregularity on three-axis force along with the installation angle and the cone angle areprovided in the straight line cutting and the associativity are analysed. The simulationresults and the similarity of test results are quantitatively analysed through thePearson correlation coefficient. The effects of the installation angle, the properties ofcoal and rock, the drum rotation speed, the pluridentate cutting and the temperature onthe pick cutting performance have been analysed in the rotary cutting. The force ofthree components (temperature field) are obtained on the typical cutting conditionsthrough simulation, quantitatively analysing the statistical value of different forces onthe same project, and the general law is given.The results indicate that sum of the wedge angle and half cone angle is less thanninety degrees, cutting force is in nonlinear variation characteristics. A good fitbetween the simulation result and the theoretical arithmetic result, the error precisionwithin10%，the high similarity of the simulation and experimental results, thePearson correlation coefficient with0.963shows that the simulation results are inconformity with the theoretical value and experimental analysis. The axial tilt angleand secondary rotating angle has a greater impact on picks’ three directional force,which is easy to cause pick wear. The pick tip cone angle has little effect on thetemperature, significant effect on the distribution of high temperature zone. The temperature distribution of pick alloy head is consistent with stress distributionshowing the crescent distribution, which indicates the theoretical model describing theactual operation correctly. The study provides the necessary theoretical basis forcutting theoretical research, and the reference for the simulation of pick cutting andcutting mechanism broking coal rock underconsidering the anisotropy of coal rockand beddings and joints.