Research And Development Of Positioning Error Compensation System For Three-Head Laser Marking Machine

Laser marking technology is a new processing technology developed after laser heat treatment,laser welding,laser cutting and other technologies.Laser marking technology can solve the difficult or even unsolvable problems of traditional processing technology easily,and plays an extremely important role in many processing and manufacturing industries.As a typical application of laser marking technology,laser marking machine is more and more widely used in various fields.With the development of laser equipment toward high precision and automation,its working requirement is also higher and higher.Therefore,high positioning precision and control mode is a great significance to improve the automation of laser equipment and the development of laser industry.The design,research and experiment of this paper are carried out with the support of Guangdong zhengye Technology Co.,Ltd.The specific tasks are as follows:1)Through the research on the structure of traditional marking machine and the analysis of current demand,the corresponding scheme design is carried out.Using SolidWorks three-dimensional software,the design models of laser marking module,linear transmission mechanism,base,pipeline positioning platform and other components are established,and the dimensions of each component are determined to complete the selection of relevant components;the components are assembled into three-head laser marking machine.As a whole,the prototype is manufactured and debugged to provide a platform for the development and research of the error compensation system.2)Determine the contact and restraint types of each part of marking machine,simplify the key parts which affect the analysis of the whole machine,that is,simulate the point contact position of ball bearing with the help of link 10 bar element,simplify the contact position of linear rolling guide with COMBIN14 spring element,then calculate the main force situation of marking machine,mesh division,etc.,and complete the preprocessing stage of simulation analysis.3)With the movement direction as the research focus,static analysis is carried out,thermal load is added to carry out steady-state thermal-structural coupling analysis,and the overall deformation and deformation in all directions of the marking machine are extracted.Through the total potential nephogram,xyz direction displacement nephogram and stress map obtained,it is found that under the steady-state thermal-structural coupling,the stress and deformation in the movement direction are larger.By comparing the natural frequencies of the whole machine in each order,it can be seen that the whole machine will not have resonance.This process mainly checks the design quality through analysis and determines the main factors affecting the deformation of the whole machine,which provides data support for the calculation of the total error of the whole machine in the moving direction.4)The main factors affecting the positioning accuracy are analyzed.Isometric points are selected in the effective travel to extract the x-direction and y-direction deformations of each point under the steady-state thermal-structural coupling analysis.The original equipment errors of the corresponding points are obtained by experiments,and the total positioning errors of each set point are approximately obtained by superimposing the two parameters.In order to improve the accuracy of the system,a weighted Lagrangian quadratic interpolation algorithm is proposed to fit the calculated total error value,and the compensation value of any position in the whole journey can be obtained according to the fitted curve.Finally,through the design of experiments to test the compensation effect,the error compensation system developed on the laser marking machine can stabilize the positioning accuracy within ±0.03 mm of the machine in the x-axis direction and y-axis direction,and all the results within the design requirements of ±0.06 mm.Compared with traditional compensation methods,this method has the advantages of convenience,accurate and stable compensation and portability.