Design Theory Analysis And Numerical Simulation Of Three Roller Symmetrical Bending Machine

Three Roller Symmetrical Bending Machine is forming equipment for bending of sheet metal, can be plate material bending into a cylinder shape, arc, cone shape or other shape. Three roller bending machine is an indispensable part of heavy machinery industry, widely used in petroleum、chemical industry、pressure vessel, etcetera With the development of rolling machine in larger scale and higher precision, the structural optimization of rolling machine is becoming more and more important.Now, The industry of bending machine develop to more greater,more meticulous, and have more problem of optimization design. The following aspects have been studied in this thesis with some three roller bending machine by Shou gang Group, Chang gang Forging and Manufacturing Machinery Company.Firstly, the force of the working roll and supporting roll are obtained by the analysis of process parameters on the bending machine, and the force of lathe bed are also calculated, which make basic for the structural optimization of and lathe bed.Secondly, the lathe bed of three rolling model is built in SolidWorks and analyzed by using ANSYS/LS-DYNA, the relation ship of bending-radius and the upper roll decent quantity and stress of the working roll, and lathe bed are researched, and the simulative results with the theoretical results is compared and analyzed the reason of error.Thirdly, In order to ensure quality, roundness and linear of forming sheet, so we must ensure that the top roller has sufficient rigidity and deflection. In this paper, using the software simulation of AutoCAD Mechanical, assuming the support reaction force, and simulate situation of bending machine roller by uniform load, Mechanical is used to inverse solution, to add the deflection on top roller, to ensure the quality of sheet metal.Lastly, according to static and modal analysis is results, the weight optimization of the lathe bed are implemented by using ANSYS optimization module and the optimization of design documents in the case of meeting the maximum stress and deformation. Increasing the stiffness of the lathe bed is implemented through the finite element ANSYS is and structural optimization. The result is used for production.