Lightweight Design Of Key Parts Of GL-2013Z Gantry Machining Center

Gantry machining center is a large-scale CNC machining equipment.The design and performance of its parts directly affect the machining accuracy of the machine tool.Vibration and stress during machining are the main reasons for the decline in machining accuracy.Severe vibration can even cause damage to parts and reduce the service life of the machine.How to reduce the quality of parts and components on the premise of ensuring the performance of parts and machine tools is a hot issue at present.In this paper,the GL-2013 Z gantry machining center is taken as the research object.The static and dynamic analysis of the whole machine is used to obtain the performance parameters of the machine tool,and the beam,saddle and bed are optimized.The main contents are as follows:(1)Use Solidworks software to establish a three-dimensional model of the entire machining center,calculate the cutting force in the milling state,and perform static characteristic analysis,modal analysis,and harmonious response analysis on the model to obtain the static deformation of the machine tool and the first six order modes Parameters such as frequency,mode shape and frequency response curve lay the foundation for the optimal design of components.(2)According to the topology optimization design theory,and based on the Ansys workbench platform,the beam is subjected to topological optimization and the combination of ribbed plate selection for lightweight design.Then,through analysis and comparison,the “X”-shaped stiffener plate was selected as the rib plate of the new beam,and the beam mass was reduced by 2.1%.By comparing the static and dynamic performance of the single piece and the machine tool before and after optimization,the effectiveness of the optimized design is verified.(3)Based on the sensitivity analysis theory,the sensitivity of the critical size of the saddle to mass,first-order natural frequency and static stiffness is analyzed,and the size that has a greater impact on performance is used as the optimal size through analysis.Finally,the multiobjective genetic algorithm is used to counteract the sliding Saddle for optimization.The optimized analysis results show that when the static and dynamic performance are significantly improved,the quality of the saddle is reduced by 2.7%,which effectively reduces the energy consumption of the machine tool and improves the acceleration performance and flexibility of the moving parts.(4)Firstly,the meta-structure optimization method was researched,and then based on the previous scholars' research conclusions,the bed was optimized based on the meta-structure,and the shortage of the meta-structure optimization method was combined with the sensitivity analysis and optimization method to perform the secondary optimization of the bed..Finally,the optimization results of the bed were verified,and the results showed that while the bed quality was reduced by 6.8%,the static and dynamic performance of the bed single piece and the machine tool were significantly improved.