| With the development of industrial automation,especially the proposal of industry 4.0,the development of automation technology plays a role in promoting,automated welding technology has an important role in modern automobile production,the advantages and disadvantages of welding technology are directly related to the quality of products,digital twin technology in the industrial automation industry gradually flourished,combined with material science and digital twin technology to optimize the welding process,especially the optimization of the robot welding process,so that the welding process is more compact,the welding process is more reasonable.According to the welding process of the actual welding production line,this paper analyzes the welding steps,studies the process parameters and methods of the welding process,divides the welding process into two parts,welding parameters and robot welding path,and makes corresponding adjustments for these two parts of the welding process,so that the parameters and welding path are more in line with the actual welding operation.First of all,the software carrier Tecnomatix using digital twin technology is used to simulate the actual automobile production line in an all-round way,and the welding workflow of the welding production line is experimented,especially the connection between the welding processes,which has been fully verified,especially the determination of the welding joint information and the preliminary design of the welding path of the welding manipulator,according to the welding data obtained by the simulation,the next welding process research work is laid.Then for the optimization and verification of welding parameters,adjust according to the number of set welding joints,specify two welding schemes with different number of welding joints,and make corresponding simulations for the two schemes,the number of spot welding and the solder joint spacing directly affect the structural strength of the wheel cover and the reliability of use,and also affect the timeliness and cost of welding processing.Using the power spectral density function PSD,simulating the load of the car wheel cover in the real use environment,the vibration during the car driving is random,the model uses two connection methods of co-node solder joint connection and coupling solder joint connection,by using ANSYS workbench software to simulate the deformation and stress performance of the car wheel cover under real vibration load,so as to verify the various effects of different solder joints and different solder joint spacing on the performance of automotive wheel shrouds,and according to the results of simulation analysis,Optimize the solder joint spacing and number of solder joints,redesign the number of solder joints in the wheel cover,and optimize the welding process of the wheel cover.Finally,for the design of the welding path of the welding manipulator and the adjustment of the welding path,by establishing the D-H coordinate system,determining the D-H parameters of the manipulator,modeling the kinematics and dynamics of the manipulator,performing the kinematic positive solution and kinematic inverse solution of the manipulator arm through the method of mathematical model,verifying the effectiveness of the mathematical model,obtaining the torque,torque and other related parameters of the manipulator according to the help of the dynamic model,using Matlab software to simulate the manipulator,and designing the welding path of the manipulator.According to the initial parameters of the welding path,the optimized objective function is established,and the constraints are determined,and the multi-objective genetic algorithm of non-dominated ordering is used to perform a limited number of legacy iterative calculations of the objective function,and a series of optimal solutions of Pareto frontier are obtained,and the optimal solution of the most suitable welding operation is selected according to the needs to achieve the purpose of optimizing the welding process. |
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