Design And Analysis Of Key Components Of An Intelligent Drilling And Milling Machining Center For 3C Product Manufacturing With An In-Machine Robot

The market demand of numerically-controlled(NC)machine tool presents the trend of high efficiency,high precision,high flexibility and intelligence.And the installation of industrial robots in the NC machine tool can achieve the above demand,but also has the characteristics of reducing the working space.Therefore,the design and optimization of NC machine tool structure which is suitable for industrial robots in the machine have theoretical and practical significance.Based on the requirements of high precision,high speed and high flexibility for the production of metal parts of 3C products,this paper designed and configured a triaxial overlapping vertical drilling and milling machining center for the robot inside the machine.To solve the problem of insufficient dynamic and static stiffness of this structural configuration,the structural optimization design of key structural parts of the machine tool is carried out to ensure the machining accuracy of the machine tool.The main content of the paper is as follows:First of all,the industrial robots and pallet changer is used to improve processing efficiency.Therefore,in the saddle point,the XYZ axial feed is overlapped.Based on the new configuration scheme of the in-machine robot triaxial overlapping vertical machining center,the rotary table,column,spindle box,sliding saddle,bed and industrial robot mounting base are designed.The dynamic and static stiffness of each structural member is analyzed by finite element method.Secondly,according to the finite element analysis results of the machine,the relationship between the height and thickness of the element structure and the quality,deformation and first order natural frequency is analyzed.The influence of the dimension parameters of machine tool reinforcement on the dynamic and static stiffness is studied.The dimensional parameters with a correlation of more than 5% are taken as design variables,and the quality,first-order natural frequency and deformation of the whole machine are taken as the design objectives,and the key components are optimized in size under the whole machine state.After optimization,the mass of whole machine increased by only 6.2kg,and the static stiffness of the machine increased by 25.34%,the first-order natural frequency increased by 8.808 HZ,and the maximum node displacement decreased from 79.48 mm to 2.473 mm.Finally,by finite element analysis of the optimized machining center,it is found that the dynamic stiffness and static stiffness are improved.At the same time,LMS TEST Lab system was used to conduct experimental modal analysis of the whole machine,and the real dynamic characteristics of the whole machine were obtained.The error between the results of finite element analysis and experimental modal analysis is within the allowable range.It is proved that the multi-objective optimization of key dimension parameters of the whole machine is accurate and feasible.Then the machine tool harmonic response analysis to determine the machine tool under the cutting load when the steady-state response.