Simulation Analysis Of Cutting And Breaking Performance Of Hard Rock Tunneling Cutter Tooth

At present,the cutting tools used in traditional operation equipment for long-distance and high-burial hard rock tunnels and full-rock roadways are mainly pick-type picks and edge scrapers.When the cutter cuts the rock,it applies a load exceeding its compressive strength to the rock to break the rock.This makes cutting operations more energy-consuming and severe tool wear.It can be seen from the research that the compressive strength value of rock is much higher than the shear strength value and tensile strength value of rock.Based on the mechanical properties of the rock,a cutterhead structure with tensile-shear failure as the rock-breaking mechanism is proposed.The cutter head is combined with the flexible cantilever roadheader to establish a cutter head hard rock cutting system.This structure reduces cutting energy consumption while increasing the service life of the cutter.The mechanical properties and crushing mechanism of the hard rock are analyzed,and the theoretical model of the cutting force and cutting heat of the cutter head is established for the cutter head structure,which provides a theoretical basis for the subsequent simulation analysis and experiment of the cutter head cutting hard rock.A finite element analysis model was established to study the cutting force of the cutter head,and the non-linear elastoplastic D-P model is used as the constitutive model of hard rock to analyze the wedge face angle and the cutter head in the hard rock.This model is used to analyze the influence law of the cutter head wedge angle,the cutter head speed,the cutter head cutting depth and other factors on the cutter head cutting force in the process of cutter head cutting hard rock.Research shows that the cutting depth of the cutter head has the greatest influence on the cutting force of the cutter head,followed by the wedge angle of the cutter head,and the speed of the cutter head has the least influence on the cutting force of the cutter head.As the speed of the cutter head increases,the impact on the cutter head becomes smaller.The cutting force of the cutter head decreases first and then becomes larger.The cutting efficiency of the cutter head decreases first and then becomes larger.The cutting specific energy of the cutter head becomes smaller.As the wedge angle of the cutter head increases,the impact on the cutter head becomes greater.The cutter head tangential force and side force become larger.The vertical force of the cutter head increases first and then decreases.The cutting efficiency of the cutter head becomes larger.The cutting specific energy of the cutter head becomes larger.As the cutting depth of the cutter head increases,the impact on the cutter head becomes greater.The cutting force of the cutter head becomes larger.The cutting efficiency of the cutter head becomes larger.The energy consumption of cutter head cutting is reduced.A finite element analysis model was established to study the cutting force of the cutter head,and the non-linear elastoplastic D-P model is used as the constitutive model of hard rock to analyze the wedge face angle and the cutter head in the hard rock.This model is used to analyze the influence of the cutter head wedge angle,the cutter head speed,the cutter head cutting depth and other factors on the cutting heat of the cutter head in the process of cutting hard rock.Research shows that the speed of the cutter head has the greatest influence on the cutting heat of the cutter head,followed by the cutting depth of the cutter head,and the wedge face angle of the cutter head has the smallest effect on the cutting heat of the cutter head.As the rotating speed of the cutter head increases,the cutting heat of the cutter head increases.As the wedge angle of the cutter head increases,the cutting heat of the cutter head decreases.As the cutting depth of the cutter head increases,the cutting heat of the cutter head increases.A simulation analysis model of cutter head wear was established to study the influence of the cutter head angle,the cutter head speed,the cutter head depth and other factors on cutter head wear in the process of cutter head cutting hard rock.Research shows that the cutting depth of the cutter head has the greatest impact on the wear of the cutter head,followed by the wedge angle of the cutter head,and the speed of the cutter head has the least effect on the wear of the cutter head.As the rotation speed of the cutter head increases,the wear of the cutter head becomes smaller.As the wedge angle of the cutter head increases,the wear of the cutter head increases first,then decreases,and finally increases.As the cutting depth of the cutter head increases,the wear of the cutter head increases.Based on the simulation analysis data,a regression model of cutter head cutting force,cutter head cutting heat,and cutter head wear was established.The three regression models are coupled together to establish a cutter head life analysis model,which provides a certain theoretical basis for the quantitative analysis of the cutter head wear in the process of cutting hard rock by the cutter head.From the cutter head life analysis model,it can be seen that as the cutter head cutting force and the cutter head cutting heat increase,the cutter head wear becomes larger.As the rotation speed of the cutter head increases,the wear of the cutter head becomes smaller.According to the cutter head life analysis model,when the cutter head speed n=150r/min,the cutter head wedge angle α=65°,and the cutter head depth h=10mm,the cutter head wear,cutter head cutting force,and cutter head cutting The heat is minimum.At this time,the cutter head has the best performance in cutting and breaking the rock.