Simulation Analysis And Optimization Of Floor Type NC Boring And Milling Machine Based On TK6813

TK6813CNC floor type boring and milling machine is an important equipment in industrial production which is widely used in national defense, aerospace, shipbuilding, automobile, engineering machinery industry. Spindle box and Ram are essential parts of the machine tool. Their comprehensive performance is directly related to the characteristics of the complete machine. There are weight balanced force, operation of cutting force, weight force on the Spindle box. The structure stiffness and dynamic performance must meet the processing complex environment. In the long time running, the ram generate thermal deformation. It affects the machine’s accuracy. The ram generate deflection deformation when it reach out from the spindle box in the processing. The deflection deformation comes from the action of gravity and cutting forces. The long range of the ram reach out the more serious for deflection deformation. For the compensation of the deflection, it is necessary to improve the ram internal structure. So the paper main work includes:1、Research on TK6813CNC Floor Boring and milling machine structure composition and working principle of the machine tool. This machine geometric model is built. Fo cus on designing and modeling of boring and milling machine spindle box and ram. Fi nally analyzes deformation sources of the ram.2、Based on the static, dynamics finite element theory, complete the static, dynamic simulation of the spindle box. At the same time, it can calculate the deformation of the structure, natural frequency, harmonic. In order to improve the spindle static stiffness and dynamic performance, the maximum stress, deformation, quality, natural frequencies are set as the output response. The25results are acquired by the design of six factors and five levels of orthogonal tests. Using the grey theory to solve the simulation results, and calculate the best combinations of dimensions L4W3H1D2t5d4. Studying on the optimization model, the maximum stress and deformation were reduced to23.812Mpa and0.0408mm, and the first-order natural frequency is326.52Hz. At the end, the static, dynamic performance of the spindle box improved.3、Based on the temperature field and the thermal stress finite element theory, a finite element model of the temperature field is built. Studying on ram steady state, the transient temperature field. Research on front surface thermal deformation at it reach out from spindle box in1200mm,600mm,200mm. Studying the relations between spindle speed and distribution of temperature field and thermal deformation through analysing the spindle speed in1000r/min,1600r/min,2000r/min operation. Set the slide deformation test of temperature field and thermal pillow, measuring ram face, side, bearing oil film, the change of environmental temperature. The highest temperature is obtained in135min and reach thermal equilibrium. The temperature is54.9℃, thermal deformation for a maximum of236.47μm. By comparing the two sets of experimental datas of the temperature field and the thermal deformation error respectively at10.2%,9.7%. Analysis the sources of error, verify the correctness of the finite element model. In order to improve the ram thermodynamic properties, the structure of ramare improved. And then optimize ram inner front rib plate by the ANSYS workbench.4、Research on the ram deformation from the theoretical angle based on the mechanical modelof cantilever beam. Study on deflection under two kinds of comprehensive effect only selfweight and gravity, cutting force deformation. Using three degree polynomial least squaresfitting only consider the relationship between weight case maximum deflection and extend thelength of the spindle box. Calculation of eccentric compression theory based on the theory ofdesign and deflection, re-rod combination deflection compensation scheme, get tension,pressure of hydraulic cylinder and ram extension curve. Studying on the spindle speed of1000r/min condition, the maximum deformation compensation backward pillow from99.65μm to20.15μm, within21μm deflection, achieve the expected purpose of compensation.