Method for analyzing and preventing forging through flow and coarse-grain defects

A preventive method, coarse-grained technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of relying on human factors, wasting materials and energy, etc., to improve efficiency, avoid recurrence, save materials and energy effect

Inactive Publication Date: 2012-12-19
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

The traditional method of preventing defects such as forging flow-through and coarse grains is to rely on the knowledge and experience of engineers and technicians, change the forging process conditions, and then trial-produce forgings until qualified forgings are produced. This wastes materials and energy, and strongly relies on Human Factors

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  • Method for analyzing and preventing forging through flow and coarse-grain defects

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Embodiment Construction

[0016] The key to the implementation of the present invention is to accurately obtain the original stress-strain data of the material, construct the material constitutive equation with as high precision as possible, and reasonably set the boundary conditions of the finite element model of the forging process; in the physical simulation test, it is required to obtain as much as possible Upsetting samples close to the actual forging environment.

[0017] Taking the forging process optimization of a 7B04 aluminum alloy forging as an example, the specific method is as follows:

[0018] (1) On the Gleeble-3500 dynamic thermal simulation test machine, the size is Φ The 10×12mm 7B04 aluminum alloy sample is subjected to isothermal constant strain rate compression test, the reduction is about 60%, the equipment automatically controls temperature, displacement and displacement speed, etc., and can automatically collect or calculate load, flow stress-strain and other related data ;

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Abstract

The invention relates to a method for analyzing and preventing the forging through flow and the coarse grain defect, which comprises the following steps of: firstly, acquiring the original flow stress-strain data of a metal through an isothermal constant-strain-rate compression test, and constructing a constitutive model of the material; then, importing the data into finite element numerical simulation software, establishing a numerical analysis model, and calculating the metal flow, the stress strain and the temperature field distribution conditions inside a forging piece after the completion of calculation; additionally, physically simulating the forging process of the metal through an upsetting test to obtain the critical conditions such as temperature, strain and the like of the metal coarse grain; and analyzing the causes to the through flow and the coarse grain by combining the test results of numerical simulation and physical simulation, optimizing the forging process, and simulating to verify the optimized forging process in the finite element software. In the invention, the finite element numerical simulation technology and the physical simulation technology are innovatively combined, the optimization of the forging process is realized, the optimized forging process conditions can be verified, so that the material and energy sources can be saved, and the efficiency is increased.

Description

technical field [0001] The invention relates to a method for analyzing and optimizing forging defects, in particular to a method for analyzing and preventing forging through-flow and coarse grain defects. Background technique [0002] Forging usually has two purposes, forming and forming. "Forming" not only includes obtaining forgings with sufficient precision, but also avoiding defects such as unreasonable internal streamlines and folding and lack of meat; "forming" refers to improving internal as-cast defects and refining grains for subsequent heat treatment etc. Process ready for good initial organizational state. In the forging process, in addition to surface defects, defects in size and geometry, there may also be defects in internal streamlines or structures, such as through-flow, rib-through and low-magnification coarse grains. Therefore, the analysis and research on the internal structure defects of forgings is an important work in the production of forgings. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 王高潮邓同生窦忠林王志录董洪波徐雪峰韩志飞刘秀良
Owner NANCHANG HANGKONG UNIVERSITY
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