XH2130 Gantry Machine Crossbeam System Static And Dynamic And Thermal Properties Research

Gantry Machines are widely used in a variety of industries including automobile, aerospace, shipbuilding. That increasing the research of technology and products have the important role in achieving the leaping development of the equipment manufactur-ing industry. Because the crossbeam system is the main bearing member in the gantry machine. The static and dynamic thermal performance of beam system have much influence on the machining accuracy and cutting performance for the machine. Therefore, the design and performance of the crossbeam system is more and more important.The paper is concern with the static, dynamic and thermal properties of the crossbeam system of XH2130 gantry machine. Research method combines the finite element analysis with theoretical calculation. The programme is carried out, which provides the theory reference for performing optimization of crossbeam system, to test whether the parts designing and performance parameters of crossbeam system meet the design requirements. The main contents are as followed:(1) Static performance analysis of crossbeam system. Firstly, the finite element models of gantry machine and crossbeam are established. Then the restraint and boundary condition for thefinite element analysis are introduced. When doing the force analysis, the impact that balance cylinders have on the key components is fully considered. The crossbeam maximum deformation for loading balancing cylinder is 0.0809 mm. It can reduce total deformation of the crossbeam very well. Under many kinds of operating conditions, static characteristic analysis of the crossbeam through the multi-model computation is obtained.(2) Dynamic performance analysis of crossbeam system. The equations of vibration analysis are obtained by summarying the theory of modal analysis. Six order vibration mode and natural frequency are gotten by the modal analysis. It can be seen that the result of the natural frequency of theoretical calculation and finite element analysis is very close. It prove that the structural design is reasonable. The harmonic response analysis for the crossbeam is based on modal analysis. Displacement-response curve on X,Y,Z direction are obtained for guide. And the method of improving harmonic response is put forward. Six order vibration mode and each order critical speed are gotten by the modal analysis for the ball screw system. Ball screw resonance does not occur on the limited range.(3) Thermal characteristics analysis of ball screw and the analysis of guide rail’s deformation. Through the finite element modeling and analysis, the temperature field and thermal deformation field of ball screwd rive system are established on the X,Y,Z directions. Main influencing factors about the thermal deformation of the ball screw system are found. And the main measures are put forward to improve the thermal characteristics of the ball screw system.(4) The distortion curve and the compensation curve of guide rail are obtained, and the equation of a fitting compensation curve is also deduced through numerical analysis. This research is expected to provide a theoretical guide for distortion compensation of the crossbeam. Finally, comparing deformation under thermal characteristics and static load find that analysis of thermal characteristics has an important effect on static characteristics for guide rail. Some effective measures are put forward to reduce the guide rail’s deformation.