Analysis And Research On Head And Tailstock And Bed Of Large Heavy-duty CNC Roll Grinder

Heavy CNC roll grinding machine which is over large, over wide and overweight is used to grind the back-up roll of wide-thick steel plate with hundred ton, large low-pressure rotor of steam turbine and large-size rollers. The headstock, tailstock and bed is the important support structure of roll whose synthesizing stiffness determines the positioning precision of the work pieces during the center tight grinding. The deformation itself and the contact deformation between parts are caused by the action of various loads influences the machining accuracy.The FEM is referenced to the analysis, the rebuilding and the optimization of the MK84160 CNC roll grinding machine's structure in this article. The purpose is promoting the maximum grinding roll from 40 t to 100 t without decreasing the positioning accuracy and stability. The research contents and methods are as follows:(1) Make the roll grinding machine's working principle, structure form, technical characteristics and force bearing status clear, determine the modification and optimization goals by theoretical analysis and participating the design actually.(2) The 3D model of the roll grinding machine is established correctly by Solidedge. Then import it to ABAQUS/CAE to finish the analysis. The principle of the selection of key parameters, the method of meshing, the definition of interaction relation and boundary conditions is determined by pre-phase analysis of the MK84160 under the 40 t grinding operating condition. Explore the methods for improving the analysis precision and reduce the analysis cost.(3) The weak link of headstock and tailstock structure is determined by combining the analysis result of FEM and the need of actual working conditions, on which the optimization and rebuilding is based.(4) Research the effect of center tight force during the grinding, explore the method of defining the center tight force in the analysis. Curve the plotting of the effect to the center contact area, the position of roll and the stress of box. Finally, determine the best range of center tight force.(5) Verify the rationality of the optimization and the rebuilding of structural and put forward the suggestions for the improvement of grinding machine stability by analyzing the dynamic characteristics of the headstock, tailstock and bed.