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Numerical simulation method for analyzing structure dimensions of unequal-length working tape of extrusion die

A technology of structural size and numerical simulation, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem that it is impossible to accurately obtain the influence of metal rheology and temperature change behavior of unequal length working belts

Inactive Publication Date: 2014-03-26
INNER MONGOLIA UNIV OF TECH
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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that in the finite element simulation process of profile extrusion, due to the separation or partial contact between the deformed body and the surface of the unequal length working belt in the calculation process of the existing finite element numerical simulation method, it is impossible to accurately obtain the unequal length working belt. The impact of the belt on the rheological and temperature behavior of the metal, the problem that the finite element numerical simulation method cannot be used to optimize the design of the unequal length working belt, and then the use of the finite element numerical simulation method to realize the unequal length working belt of the special profile extrusion die Accurate analysis of structural dimensions

Method used

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  • Numerical simulation method for analyzing structure dimensions of unequal-length working tape of extrusion die
  • Numerical simulation method for analyzing structure dimensions of unequal-length working tape of extrusion die
  • Numerical simulation method for analyzing structure dimensions of unequal-length working tape of extrusion die

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Embodiment 1

[0035] According to the above situation, in order to facilitate the judgment of the rationality of the simulation results and improve the calculation efficiency, the present invention first takes a small-section rectangular profile with a width of 25mm and a thickness of 4mm as an example, and solves the extrusion of the equal-length working belt by using unequal-length working belts. The knife-bent defects produced by the profile in the process, and then analyze the rationality of the calculation method. In order to obtain the knife bend produced during the extrusion of the equal-length working belt, the position of the die hole along the width direction (x-axis direction) is asymmetric to the center of the extrusion cylinder, such as figure 2 shown. When the working belt with equal length is used, since the metal flow rate near the center of the extrusion cylinder is fast, a knife bend on the left side will inevitably occur during extrusion. In order to eliminate the knife ...

Embodiment 2

[0052] The rational configuration of the structural dimensions of the unequal-length working belt of the large-scale aluminum alloy solid profile extrusion die is the key to obtaining high surface quality, high dimensional precision products and improving the service life of the die. Figure 5 Shown is the cross-sectional shape and main dimensions of large aluminum alloy profiles, of which the cross-sectional area is 31303.9mm 2 .

[0053] according to Figure 5 It can be seen that the wall thickness of the profile varies greatly, and the wall thickness part (B) is located near the center of the extrusion barrel, while the thin wall parts (A, C, D) are far away from the center of the extrusion barrel. According to the extrusion theory, there is no friction between the metal at the center of the extrusion cylinder and the cylinder wall, and the metal flows most easily during the extrusion process, while the metal near the cylinder wall lags behind the flow of the metal relativ...

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Abstract

Provided is a numerical simulation method for analyzing structure dimensions of an unequal-length working tape of an extrusion die. Simulation is carried out on the sectional material extrusion process, a die surface and the working tape are arranged to be two independent entities, a slope working tape is arranged, the inclination angle between the surface of the working tape and the extrusion direction ranges from 1 degree to 2 degrees, after three-dimensional model assembly is carried out, meshing is carried out, split friction boundary conditions are set, and a common friction model is selected for a deformation body, the inner wall of an extrusion barrel and the die surface, namely, a cutting friction model with a constant friction factor is adopted; a Coulomb friction model related to pressure is adopted for the deformation body and the surface of the working tape; extrusion technological parameters are applied to finite element software, data files are generated, and simulation analysis is carried out. According to the numerical simulation method for analyzing the structure dimensions of the unequal-length working tape of the extrusion die, due to the fact that the method of split modeling, the method of the slope working tape, the method of the split friction boundary conditions and the like are integrated, the problem that the deformation body is separated from the surface of the unequal-length working tape, or makes local contact with the surface of the unequal-length working tape is solved.

Description

technical field [0001] The invention belongs to the field of numerical simulation analysis, in particular to a finite element numerical simulation method for analyzing, designing and optimizing the structural size of the unequal-length working belt of an extrusion die. Background technique [0002] With the rapid development of aerospace, rail transit, machinery manufacturing and other fields, the demand for special aluminum profiles with thin walls, large aspect ratios, and complex shapes is gradually increasing. As an important component in the above fields, this type of material is required to have high dimensional accuracy, shape and position tolerance and good comprehensive performance. [0003] The production of special aluminum profiles by extrusion is currently the most feasible and even the only production and processing method. Reasonable matching of unequal length working zones of extrusion die cavity is the key to balance the metal flow rate of profile section o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 黄东男马玉左壮壮李有来
Owner INNER MONGOLIA UNIV OF TECH
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