Kinetic Research Of HTM125 Turn-milling Complex Machining Center Key Functional Parts

With the rapid development of technology,CNC machine tools turn in the direction of high-speed,high-efficiency and high-precision.It is more widely used in engineering machinery,automobile,ship building and aerospace industries.However,the static and dynamic performance of the machine is an important indicator of determining the quality of machine design,and performance evaluation,it's necessary that the machine must have good static and dynamic characteristics to achieve high efficiency,precision machining.Therefore,it's very necessary to finite element analysis of static and dynamic characteristics for key components of machining centers.The main purpose of this paper is to study the HTM125 model milling machining center which is developed by the Shenyang Machine Tool Group,the machining center is a heavy?dual turret and five-axis milling machining centers,Its distinguishing feature is to set up a dual headstock and a plurality of self-centering device,also equipped with dual turret structure.It is able to achieve the milling machining of 30 ton large-scale rotary part.This paper analyzes and summarizes the current research of milling machining centers,obtaining the development history,current situation and future trends of milling machining center.Building a three-dimensional solid model of center column,headstock and other key components of the bed of milling machining by a three-dimensional modeling software which named SolidWorks,and on this basis,Completing the assembly of column,headstock and bed parts and development of the center virtual prototype of HTM125 turning milling.By importing the three-dimensional solid model of established column,headstock and bed to finite element analysis software ANSYS Workbench to establish the corresponding finite element model,conducting the appropriate analysis of corresponding statics and modal harmony of column,headstock and bed.Firstly,by the comparative analysis of the deformation of the column unload and load,and the situation of the stress and strain shows that the deformation of the column at work,the stress and strain is relatively large,but the biggest stress is far less than the limit stress of the material of column,and column design is too conservative,there is still much room for optimization.Modal analysis has got the top 10 natural frequencies and mode shapes of the pillar,it can be seen that swing,twisting and breathing vibration occurs mainly in the column by describing modes of cloud,Larger deformation occurs at the top of the column and the part of middle rail,it should be setting the stiffener or changing the thickness of wall in the corresponding weaknesses,in order to improve the dynamic stiffness of the column.Harmonic response analysis gets the harmonic amplitude-frequency response curve when the column subjected by external excitation force,According to the curve,it can be drawn that the column should be avoided the resonance frequency region in the actual process.Secondly,modal analysis of the headstock has got its top 10 natural frequencies and mode shapes,the modal cloud of the headstock indicates that a certain degree of swing,twisting and breathing vibration also occurred,moreover,the cabinet top of the headstock and the part of intermediate support ribs are the corresponding weaknesses,it can be optimized in the subsequent design.When the headstock suffered by external excitation force,harmonic amplitude-frequency response curve of the headstock can also be given by harmonic response analysis.From the harmonic amplitude frequency response curve,it can be seen that the importance of fundamental to the headstock,in the actual process,the headstock should try to avoid these resonant frequency region.Finally,modal Analysis of the combination bed of milling machining center,by obtaining the natural frequencies and mode shapes of combination bed,it can be seen that the combination bed occurs mainly bending and wavy bending modes,in the future optimization process,stiffeners or increasing the thickness of ribs should be set in the weak links of the bed,in order to improve the dynamic stiffness of the bed.