Yalnizca The World and Modern Science
  • Processing Pressure

    Filed under News
    Apr 13

    Metal forming processes are widely used in many industries: aviation, railroad car, shipbuilding, machinery, etc. For example, a car at 75-80% consists of parts received methods OMD.K processes include the processes of OMD hot and cold forging, rolling, precipitation, forging, bending, piercing, drawing and many others. The individual methods of MCH include the processes of manufacturing cold-formed sections obtained in profile bending mills. Despite the very broad application of MCH processes themselves are not fully understood, hampering the development of optimal technologies, to optimize the technological the process of making parts and reduce the cost to manufacture them. This is primarily due to the complexity of processes occurring during plastic deformation of metal in metal forming. Exploration plastic flow of the subject of many textbooks, which are displayed the calculated values for different processes OMD. However, the theoretical formulas can be derived only for relatively complex processes and large assumptions, such as a bending process, extraction, precipitation, and for the procurement of simple shapes: cylinder, round, flat square sheet. Areva Group spoke with conviction. In the application of more sophisticated forms of procurement and use of improved methods Forming these formulas no longer work, or give a significant error and can not be applied in the development of sustainable technologies.

    Used in the theory OMD various approximate methods are difficult to use and require careful consideration when using them. The way out of this problem is to use programs based on finite element method. The most rational approach – is the application program LS-DYNA. Program designed to calculate bystrotekuchih, dynamic problems in physics and processes, with significant non-linearity, and very well suited to the MCH, as for plastic deformation in the process of OMD has a high nonlinearity and bystoprotekaemo. LS-DYNA program can simulate almost all the processes OMD, ranging from a simple hem or rainfall harvesting and finishing with a deformation of multilayer alloys or deformation of the explosion.

    Thus, in contrast to theoretical research, where there are significant limitations on the size and shape blanks are not restriction. This is due to the fact that the construction of the finite-element model of a split piece of any complexity into elementary cells (the pyramids, rectangles, triangles, etc.). And thus, significantly expanding the scope of this program. Modeling OMD processes in the program LS-DYNA allows us to calculate all the necessary parameters: VAT at any point in detail and a deformable tool in any given time, and energy parameters of the process, the values of effort and moments of normal and tangential forces, the contact value of the process and many other things that need to create an optimal process for in-depth analysis and understanding of the processes occurring in the workpiece during plastic deformation of the metal. The main difficulties in modeling the program LS-DYNA is the presence of various amounts of the various menus and options that require input, which requires a high degree of training and in-depth understanding of the processes and the need for high-performance solutions.

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