Static And Modal Analysis Of Laser Cutting Machine Body Based On Finite Element Method

Laser cutting machine is one of the very important categories of CNC machine tool products.In recent years,with the rapid development of laser sheet metal industry,the running speed and processing format of laser cutting machine are continuously improved,but at the same time,there are higher requirements for the bed performance required by machine tool precision machining.In the research process,this paper selects the bed of G12025-H12000 laser cutting machine in the R & D period of a company as the research object,and carries out simulation with ABAQUS software to verify whether the bed design can meet the requirements.The main problems to be solved are:(1)modal analysis of the dynamic performance of the bed to confirm that the bed will not resonate with the excitation servo motor and affect the cutting accuracy.(2)According to the pre reached technical parameters,calculate the working frequency range of the servo motor,compare the natural frequency of the bed,and select the servo motor.(3)Static analysis whether the stress of the bed under different working conditions is within a reasonable range and whether it exceeds the yield strength of the material.The research results can lay an important foundation for the design of larger format and higher precision laser cutting power characteristics,fault analysis and diagnosis in the future.During the finite element analysis,this paper first imports the G12025-H12000 machine tool bed drawing drawn by Solid Works software into ABAQUS.Using the CAE analysis module in the software,the free grid division method is used to mesh the bed,and then the deformation analysis is carried out.At the same time,the constraint conditions are changed to determine the stress distribution and displacement deformation of the bed under normal load conditions and hoisting conditions under the influence of static force.The deformation position and maximum stress value are 116 mpa,which is 106.8mpa higher than the allowable stress of the material.After secondary improvement,the maximum stress value is57 MPa,which meets the requirements.Then through modal analysis,the dynamic performance of the bed and the connection between the bed and the beam are analyzed,and the first eight order main vibration model and natural frequency data of the bed are obtained.According to the technical requirements,there is no overlap between the working state frequency of the servo motor 212.3Hz and the 8th order natural frequency of the bed,and there will be no resonance.It is also confirmed that the preselected servo motor can be applied.Using the method of finite element analysis and computer design,this paper studies the mechanical stability of the body structure of G12025-H12000 laser cutting machine tool,verifies that the stiffness design of the bed is reasonable,and provides ideas and guidance for optimizing the bed structure in the future.