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Optimal preform Die design through Controlling Deformation Uniformity in Metal Forging

Journal of Materials Science & Technology 2002年第5期18卷 465-467页

作者： XinhaiZHAO GuoqunZHAO GuangchunWANG TonghaiWANG Mould and Die Eng. Cent. Shandong Univ. Ji'nan 250061 China

A finite element based sensitivity analysis method for preform die shape design in metal forging is developed. The optimization goal is to obtain more uniform deformation within the final forging by controlling the deformation uniformity. The objective function expressed by the effective strain is constructed. The sensitivity equations of the objective function, elemental volume, elemental effective strain rate and the elemental strain rate with respect to the design variables are constituted. The preform die shapes of an H-shaped forging process in axisymmetric deformation are designed using this method.

关键词： Metal forging preform design Sensitivity analysis Deformation Strain

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维普期刊数据库

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Buster Die Shape design of a Track Link Forging Using FEM Based Back-Tracing Method

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Journal of Materials Science & Technology 2001年第1期17卷 139-140页

作者： Guoqun ZHAO Xue DENG Mold&Die Engineer Technology Research Center Shandong University of TechnologyJinan 250061China

For the preform design of a complex track link forging, fifteen critical sections were selected for two dimensional back-tracing using FEM. The preform shapes of the critical sections are designed and integrated into an ideal 3D busting shape. The buster dies are finally designed according to the ideal busting shape with a little of modification. The 3D simulation of the busting stage is carried out.

关键词： two dimensional preform design

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维普期刊数据库

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Optimization of preform Shapes by RSM and FEM to Improve Deformation Homogeneity in Aerospace Forgings

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Chinese Journal of Aeronautics 2010年第2期23卷 260-267页

作者：杨艳慧刘东贺子延罗子健西北工业大学材料学院

This article, in order to improve the deformation homogeneity in aerospace forgings, proposes an approach that combines the fnite element method （FEM） and the response surface method （RSM） to optimize the preform shapes. New expressions that take into account the influences of equivalent effective strain distribution are developed to evaluate the homogeneity of deformation distribution in aerospace forgings. In order to reduce the number of design variables, the domain-division method is put forward to determine the optimal design variables. On the basis of FEM results, the RSM is used to establish an approximate model to depict the relationship between the responses （deformation homogeneity and die underfilling） and the design variables repre- sented by geometric parameters of the preform shape. With a typical aeroengine disk as an example, the proposed method is verified by achieving an optimal combination of design variables. By comparing the preform shape obtained with the proposed method to that with the existing one, it is evidenced that the former could achieve more homogeneous deformation in forging.

关键词： response surface method optimization preform design finite element method

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维普期刊数据库

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The Microstructure Optimization of the H-shape Forgings Based on preforming Die design

The Microstructure Optimization of the H-shape Forgings Base...

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第五届国际材料与热加工物理模拟及数值模拟学术会议

作者： Jing GUAN Guangchun WANG* Tao GUO Libin SONG Guoqun ZHAO School of Materials Science and Engineering Shandong University Jinan 250061

The microstructure optimization design method of the forging process is proposed. The optimization goal is the fine grain size and homogeneous grain distribution of the forgings. The optimization object is the preforming die shape. The microstructure optimization code is developed using the micro-genetic algorithm and the finite element method. The two forming steps including the preforming process and the final forging process of the H-shape forgings are analyzed using the self-developed code. The optimization results show that the fine grain size and the homogenous grain distribution can be achieved by controlling the shape of the preforming die. The samples with the same size as optimization are preformed and then forged to the desired H-shape forgings under the same deformation conditions as optimization. Micrographs in the symmetry section of samples show that the grain sizes of the forgings are almost coincident with the optimization results.

关键词： forging microstructure optimization preform design

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