The 3D CAD Model Of Cold Ring-rolling Mill And Optimization

Ring rolling is a high efficient rolling method for manufacturing seamless rings, which is a progressive partial plastic forming technology. The diameter of the ring is increasing as the area of the cross-section decreasing in ring rolling. Ring rolling is of many characteristics such as saving forming force and production cost, increasing utilization ratio of energy and material, rising productivity, widening processing range of ring products etc., and so widely employed in many industrial domains of machinery, metallurgy, chemical engineering, energy sources, and aeronautics etc. Ring rolling mill is the core equipment of the rolling technology.The study in the dissertation briefly introduces the classifications and the advances of ring rolling mills and has taken an insight into the cold ring rolling mill with type of D56G90. The structure and capability of the cold ring rolling mill with type of D56G90 are expounded and the 3D CAD models of the spindle assembly, mandrel, guide roll, main block, feed system, main drive, manipulator, machine tool bed, and the whole machine tool are proposed. The kinematical model is established on the base of 3D CAD models and ADAMS which is one of the virtual prototyping technology soft wares, the kinematical system model is simulated and the working course of the cold ring rolling is reappeared. The regulations of displacement, velocity and acceleration of the main components are drawn by the analysis of thekinematics. The mechanical models of the components--the mill housing and ballscrew are proposed based on three-dimensional finite element analysis with FEM software ANSYS. The strain and equivalent stress distributions are drawn. Then, an optimization method is proposed to design the main parameters of the mill housing and the ball screw based on the parameter geometrical models of the housing and the ball screw.According to the finite element analysis, the maximum stresses of the housing and the ball screw are less than the allowable stresses. So the stiffness should be focused. Through optimization, the weight of the mill housing lessened 17.9 percent, the stiffness of the housing increased 10.48 percent; the stiffness of the ball screw increased 29.62 percent. The materials are used more sufficiently, and the precision ofthe ring is also improved. The study of the cold ring rolling mill with type of D56G90 in the dissertation has great-applied significant, and can be used as a basis for design and production of new types of cold ring rolling mills.