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A Numerical Simulation Method for Analyzing the Structural Dimensions of Extrusion Dies with Unequal Lengths

A numerical simulation and structural size technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem that the influence of metal rheology and temperature change behavior of unequal length working belts cannot be accurately obtained

Inactive Publication Date: 2017-09-22
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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  • A Numerical Simulation Method for Analyzing the Structural Dimensions of Extrusion Dies with Unequal Lengths
  • A Numerical Simulation Method for Analyzing the Structural Dimensions of Extrusion Dies with Unequal Lengths
  • A Numerical Simulation Method for Analyzing the Structural Dimensions of Extrusion Dies with Unequal Lengths

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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

A numerical simulation method for analyzing and optimizing the structural size of the unequal-length working belt of an extrusion die. The profile extrusion process is simulated. The die surface and the working belt are set as two independent entities, and the working belt surface and the extrusion direction are 1 to 2 For the slope working belt with an inclination angle of °, after the three-dimensional modeling is assembled, the grid is divided, and the split friction boundary condition is set. The conventional friction model is used between the deformed body, the inner wall of the extrusion cylinder, and the surface of the mold, that is, the shear with a constant friction factor is used. Friction model: Coulomb friction model related to pressure is adopted between deformed body and working belt surface. Apply extrusion process parameters in finite element software, generate data files, and carry out simulation analysis. The invention integrates methods such as split modeling, inclined working belt, split friction boundary conditions, etc., and solves the problem of separation or local contact between deformed bodies and surfaces of unequal-length working belts.

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 Patents(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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