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Numerical simulation technology for hollow section porthole die extrusion welding process

A numerical simulation technology, technology of hollow profiles, applied in the direction of metal extrusion dies, electrical digital data processing, special data processing applications, etc., can solve problems such as termination of simulation calculations

Inactive Publication Date: 2009-12-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of terminating the simulation calculation due to mesh separation and penetration of the welded surface during the finite element simulation process of the extrusion of the hollow section with asymmetrical section, so as to realize the whole extrusion process of the hollow section with asymmetrical section Finite Element Simulation of Flow Deformation Behavior

Method used

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  • Numerical simulation technology for hollow section porthole die extrusion welding process
  • Numerical simulation technology for hollow section porthole die extrusion welding process
  • Numerical simulation technology for hollow section porthole die extrusion welding process

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Effect test

Embodiment 1

[0045] By adopting the finite element simulation technology of the extrusion welding process of the split mold of the present invention, the problem of the repairing of the interpenetrating unit grids of the welding surfaces is solved, and the realization of figure 1 The finite element simulation of the whole extrusion process of the square tube shown.

[0046] The size of the square tube is L30×t2mm, and the metal deformation body, that is, the billet diameter is Φ90mm, the diameter of the extrusion cylinder is Φ95mm, the extrusion ratio is 31.6, and the split ratio is 12.6. The shear friction model is selected between the blank and the mold, and according to the results of the ring compression experiment, the friction factor m=1 is taken.

[0047] The initial process conditions of extrusion are billet (A6005 aluminum alloy) temperature 480°C, extrusion cylinder temperature 400°C, mold (H13 hot work die steel) temperature 450°C, extrusion pad temperature 30°C, extrusion shaft...

Embodiment 2

[0064] The section and size of the asymmetric porous hollow profile are as follows: Figure 20 As shown, the solid mold structure is as Figure 21 shown. For such hollow sections with inconsistent welded surfaces and symmetrical surfaces, the numerical simulation analysis of the whole process of extrusion can only be completed by using the mesh repair technology of the welded surface of the present invention.

[0065] The finite element software Deform-3D is used for simulation. The absolute grid method is used for grid division. The calculation unit is a tetrahedral grid unit. Set the minimum size of the unit to be 1mm and the maximum to be 30mm during the simulation.

[0066] Assuming that the diameter of the billet and the extrusion cylinder is Φ238mm, and the extrusion ratio is 31, the shear friction model is selected between the billet and the die, and according to the ring compression test results of the billet and the die, the friction factor m=1 is taken.

[0067] T...

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Abstract

The invention discloses numerical simulation technology for a hollow section porthole die extrusion welding process, which belongs to the technical field of metal extrusion. The technology comprises the steps of: adopting finite element software Deform-3D to simulate a porthole die extrusion process; adopting a finite element fractional step method for calculation; transforming a three-dimensional solid model of finite element meshes into a three-dimensional surface model taking small triangular patches as basic description units, namely an STL (Stereolithography) model in the finite element software Deform-3D when the volume of penetration areas of mesh units of a welding surface is equal to that of unfilled areas of the welding surface; repairing triangular patch meshes, which are penetrated with each other, of the welding surface in the STL model to ensure that original penetration areas and the unfilled areas reform the three-dimensional surface model consisting of triangular patch units; adopting a 3X fraction method to import the repaired STL model into the finite element software Deform-3D; and adding nodal data of original units into the model to generate a new data file, and finishing simulation analysis of a porthole die extrusion welding stage and the overall process of the extrusion.

Description

technical field [0001] The invention belongs to the technical field of metal extrusion, and in particular relates to a finite element simulation technology for the repairing of penetration grids of the welding surface of an asymmetric section hollow profile splitter die and the welding process. Background technique [0002] Split die extrusion is the main method for producing various aluminum alloy hollow profiles. Analyzing the influence of die structure on metal flow and deformation behavior during extrusion is a prerequisite for designing reasonable die structure parameters and reducing the number of die trials on the machine. At present, with the increasing application of aluminum alloy profiles in the fields of rail trains, automobiles, ships, and aerospace, the cross-sectional shape of the profiles has become more and more complex. The design method is difficult to meet the needs of hollow profile die design [Liu Jing'an, Xie Jianxin. Large-scale aluminum alloy profile...

Claims

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Application Information

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IPC IPC(8): G06F17/50B21C25/02
Inventor 谢建新黄东男李静媛张志豪
Owner UNIV OF SCI & TECH BEIJING
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