8 Tons Of Press Pressure And Synchronous Drive System Dynamic Modeling And Structural Analysis

Giant forging presses can be used to produce large-scale productions of light metal alloys, and also can be used to produce other ferrous metal forgings such as a variety of steel with low plasticity and high strength, heat-resistant steel and carbon steel and low-alloy steel and so on. It has a vital role in the production of forging of large-scale in defense and aviation industries.For overcome the adverse effects of eccentrically loaded which caused by the factors of uneven distribution of temperature, varying width of rough, resistance of deformation anisomerous and so on, both the main drive system and synchronization system of giant forging presses use spherical connections. The connections reduce the lateral force and wear effectively, improve service life of parts also.In this past, the study of the spherical connections, which is widely used in the press, is only on theory and set up just static analysis model, and the complexity of dynamic contact state didn't take into account. In this paper, we analyze the characteristics of the spherical connections, and put forward a general approach of meshing spherical structure, research the significance of stick-slip model and dynamic contact model for the dynamic model of spherical bearing structure, bring up the ways how to load the dynamic boundaries of the dynamic model of spherical bearing structure, and establish a dynamic model which can simulate the actual situation more accurate.Combination of both the structure of the main drive system and synchronization system of 800MN forging hydraulic press are use spherical bearing structure, establish the dynamic model of hydraulic cylinder system, as well as synchronous balance system by using hexahedral element and make following analysis:1,Check stiffness and strength of the main cylinder and the synchronous cylinder, and find there is high stress on the fuel feed hole of cylinders, for overcoming the problems we bring up some optimization programs as follow: Change the shape of the hole in the middle, and the stress of the fuel feed hole decrease to 238MPa from 356MPa; For synchronous cylinder, transfer the hole to the flange, which make equivalent stress of the hole decrease to 131MPa from 391MPa.2,Studied the connections between the cylinder plunger and moving beams, analyze the performance of the seal of main cylinder, and calculate the size of the lateral thrust when different connections were used. The results show that double spheres connections have more advantageous than single speres connections.3,Analyze the distribution of stress and deformation of the synchronous system of press, and inspect its connections; Study the connections between the axis and the piston, and set up a new structure of synchronous system.Finally, stress values of parts of key points of the press were obtained by measuring. Combine the result of test with the finite element analysis, the dynamic model which established in this paper of the sphere bearing structure is effective and correct has been verified.