Pressure Compensation Technique Based On Finite Element Bending Machine Research

Bender is the pressure equipment used to bend sheet metal. By the simple common mold, it not only can press the metal sheet into certain geometry, but also be used as light stretching, notching, punching, wave pressing, etc. With the rapid development of industrial technology, the bender has been widely used in industry segments, such as the electrical, electronics, container, metal structure, instrumentation, hardware, building materials and so on.The traditional design method of pressure machine including bender is based on the Mechanics of Materials or the Theory of Elasticity to calculate structural stress and deformation. But to the actual structure, the formulas often make large errors, particularly in high stress areas. So it is hard to accurately calculate, and the design only works by experience, which will result in the lack of local strength or excessive safety margin and so on.With the development of computer technology, computational mechanics theory, especially the finite element method, it makes possible to research the bender by modern design methods. Taking a 100 ton bender as the object of this study, we make the static finite element analysis. Combining the experimental test for updating the model, the structure is optimized on this basis. Then using Theory of Elasticity, we analysis the stress and deformation of the workbench, and optimize the design of hydraulic compensation with the emphasis on workbench. The main contents are as follows:First, the bender is experimental tested, and the stress and deformations of the main components is got.Second, using the general finite element analysis software ANSYS as the tool, the whole model of the bender and the contact model between slider and workbench are established, and linear static analysis of the bender is performed, which gets the stiffness and intensity of each part. Combination of test results to modify the bender model, which provides the basis for the structure optimization.Third, according to the structural weaknesses and characteristics, the main parts of the bender are optimized, in order to improve the structure, increase the partial strength of bender and reduce the structure weight.Forth, by the Theory of Elasticity, the elastic deformation of simplified workbench structure is analyzed, which provides a theoretical basis for the deflection compensation.Finally, taking pressure homogenization of the workbench as objective function, the hydraulic compensation structure is analyzed and optimized.