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Analysis and rheoforming numerical simulation method for alloy semi-solid rheoforming

A technology of semi-solid rheology and analysis method, applied in the direction of CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve the problems of complex and unestablished rheological behavior of semi-solid metal paste, and achieve parameters Less, improve efficiency, reduce cost effect

Active Publication Date: 2021-06-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Judging from the situation reflected in the current data, although some achievements have been made in the description of the apparent viscosity of the semi-solid metal paste, due to the complexity of the rheological behavior of the semi-solid metal paste, it is generally used and can correctly describe the semi-solid metal paste. The uniform apparent viscosity of the rheological behavior of the material has not been established

Method used

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  • Analysis and rheoforming numerical simulation method for alloy semi-solid rheoforming
  • Analysis and rheoforming numerical simulation method for alloy semi-solid rheoforming
  • Analysis and rheoforming numerical simulation method for alloy semi-solid rheoforming

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Embodiment 1

[0052] Viscometer is used to obtain the viscosity data of A356 aluminum alloy at different temperatures and different shear rates, as shown in Table 1, the data in Table 1 is fitted using the viscosity model of the present invention to obtain A356 aluminum alloy semi-solid slurry The relationship between the apparent viscosity of the material and the temperature and shear rate is shown in formula 1.

[0053]

[0054] A356 aluminum alloy melt viscosity changes with melt temperature and shear rate as follows figure 2shown. Comparing the fitted curve with the experimental values, it can be found that the data corresponding to the fitted viscosity model is in good agreement with the experimental values.

[0055] Table 1

[0056]

[0057] The semi-solid viscosity model of A356 aluminum alloy in Equation 1 is coupled with the basic fluid mechanics and flow equations of the simulation software, and the mathematical viscosity model of rheological deformation process is establ...

Embodiment 2

[0059] Adopt viscometer to obtain the viscosity data of AZ91D magnesium alloy under different temperatures and different shear rates, as shown in table 2, utilize viscosity model described in the present invention to figure 2 The data in is fitted, and the relationship between the apparent viscosity of the AZ91D magnesium alloy semi-solid slurry and the temperature and shear rate is obtained, as shown in formula 2.

[0060]

[0061] AZ91D magnesium alloy melt viscosity changes with melt temperature and shear rate as follows Figure 6 shown. Comparing the fitted curve with the experimental values, it can be found that the data corresponding to the fitted viscosity model is in good agreement with the experimental values.

[0062] Table 2

[0063]

[0064] The semi-solid viscosity model of AZ91D magnesium alloy in formula 2 is coupled with the basic equations of fluid mechanics and flow, and the mathematical model of rheological die-casting forming process is established...

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Abstract

The invention discloses an analysis and rheoforming numerical simulation method for alloy semi-solid rheoforming, the model is simple and accurate, has few parameters, can accurately reflect the relationship among temperature (solid fraction), shear rate and viscosity when the solid fraction of metal semi-solid slurry is less than 70%, and can accurately reflect The dynamic change condition of the viscosity in the non-Newtonian fluid flow shearing process. The viscosity model is coupled with a fluid mechanics and flow basic equation, a metal rheoforming process mathematical model is established, the mathematical model can be used for metal semi-solid rheoforming numerical simulation, semi-solid slurry flow characteristics, mold filling and solidification rules and defect prediction in the rheoforming process can be accurately obtained, in addition, optimization of the forming process and mold design is facilitated, and a good guiding effect is achieved on accurate control over the whole process of preparation, conveying and rheological forming of the semi-solid slurry.

Description

technical field [0001] The invention relates to a magnesium or aluminum alloy performance measurement technology, in particular to an alloy semi-solid rheological deformation analysis and rheological deformation numerical simulation method. Background technique [0002] Semi-solid forming is an advanced metal forming technology. The forming process of semi-solid slurry under pressure is complex, and the development of numerical simulation technology for slurry flow and forming process is relatively late. Since the 1990s, scholars at home and abroad have carried out numerical simulations on the forming process of semi-solid metal paste. The use of numerical simulation is helpful to optimize the semi-solid metal forming process, mold design and defect prediction, and promote the research and application of semi-solid metal forming. At present, most of the simulations of the semi-solid forming process are based on some commercial finite element or finite difference software, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/28G06F111/10G06F113/08G06F119/08G06F119/14
CPCG06F30/23G06F30/28G06F2111/10G06F2113/08G06F2119/08G06F2119/14
Inventor 祁明凡李静媛康永林张莹王继成李谷南邓蒨瑜
Owner UNIV OF SCI & TECH BEIJING
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