Optimization Design Of Gantry Laser Cutting Machine

As a common equipment in the modern processing industry,laser cutting machine has always been an important criterion for measuring the pros and cons of laser cutting machines.Among the various components of the laser cutting machine,the stability of the beam is particularly important.As a moving component carrying a laser transmitter and a servo motor,the comprehensive performance will directly affect the machining accuracy of the laser cutting machine.In this paper,a small and medium-sized laser cutting machine with a processing width of 3000mm× 1500mm is used as the research object,and a three-dimensional model of the whole structure of the laser cutting machine is established.The ANS YS software is used to perform static analysis and modal analysis on the laser cutting machine and the beam assembly..In order to optimize the performance of the beam,the relationship between the stiffness,stability and quality of the key components(beam components)of the laser cutting machine and its structural parameters was studied.The structural parameters of the five laser cutting machine beam components were selected as design variables(installed separately The thickness of the side wall of the ram on the beam of the laser cutting machine,the thickness of the upper wall of the beam of the laser cutting machine,the wall thickness of the rib in the middle of the beam of the laser cutting machine,the thickness of the side wall of the beam of the laser cutting machine,and the thickness of the lower wall of the beam of the laser cutting machine)The orthogonal test was used to establish the data relationship between the structural parameters of the five laser cutting machine beams and the three performance indexes(the stiffness of the beam cutter beam,the first-order natural frequency and the beam quality),and the second-order response surface model was used to construct the orthogonal test.The functional relationship between the structural parameters of the middle beam component and the performance index.Aiming at improving the rigidity and stability of beam components,the multi-objective optimization model with three performance indexes is established by using the response surface model function,and the global search algorithm is used to obtain the optimal solution after screening.The optimization results show that the displacement of the laser emitting hole position of the laser cutting machine is reduced by 10.15%,and the beam stiffness is improved.The first-order natural frequency of the laser cutting machine beam is increased by 9.17%,which reduces the probability of resonance;the beam component quality remains basically unchanged change.In order to verify the reliability of the optimized structure,a multi-body dynamics model of the beam component is established by using the rigid-flexible multi-body dynamics principle to simulate the dynamics.The simulation results show that the structural performance of the beam component is better after optimization,which indicates that the structure has certain reliability and the structural stability of the beam component is improved.