Wear And Life Prediction Of Disc Hob Tools Based On Wear Mechanism

With the economic growth and the continuous improvement of urbanization level,China's tunnel engineering has developed rapidly.The tool is used as a key tool for shield tunneling in tunnelling construction,and its cost is an important part of construction cost.In-depth study of tool wear mechanism is of great significance for reducing tool consumption and controlling construction costs.Different construction methods and geological environments can cause changes in the amount of tool wear.Based on a hard rock tunnel project in Shaanxi,this paper analyzes the wear mechanism of the hob cutter ring and establishes the cutter ring wear model.It reduces the tool wear by optimizing the structural parameters and construction parameters,and predicts the life of the disc hob.Based on the analysis of rock breaking length and CSM model rock load,the rock breaking mechanism and main wear mechanism are analyzed,and the cutter ring wear model is established.The optimization algorithm is used to optimize the ratio of different wear mechanisms.The discretization fit corrects the volume wear of the hob.The corrected wear calculation is less than 20%compared with the engineering data,indicating that the wear model has good accuracy and can be used to calculate the total volume wear of the cutter ring.The hob wear simulation model was established by finite element analysis software,and the volume wear of the disc hob was calculated.The rock breaking force and wear depth of single and double knives under different penetration degrees were compared.The results show that as the penetration and the knife spacing increase,the corresponding force and wear depth of the single and double knives will increase continuously,but the simulation results of the double knives are closer to the theoretical calculation results.Analyze the influence of cutter disc arrangement,construction parameters and structural parameters on tool wear.By calculating the tool wear of different cutter head distributions,it is shown that the tool installation radius is an important factor affecting the tool wear.The cutter arrangement using the Archimedes spiral method can reduce the volume wear of the tool and help to increase the tool's volume.Digging distance.Based on the artificial fish swarm algorithm,the optimal value of each target is solved first,then the overall evaluation function is established,and the minimum point of the evaluation function under all constraints is solved.Comparing the design parameters,the optimized parameters satisfy both constraints and the objective function value is better,which is a set of feasible parameters.Based on the support vector machine nonlinear regression model,the modern optimization algorithm is used to optimize the parameters and penalty parameters of the kernel function,and the optimal parameters are used to establish the prediction model of the tool life.By comparing and analyzing several different algorithms,the gravity search algorithm has small error,high prediction accuracy and short prediction time.