Optimal Preform Die Shape Design through Controlling Deformation Uniformity and Deforming Force in Metal Forging

Zhao, Xinhai; Li, Jianfeng; Xiao-hui, Huang; Guo-qun, Zhao; Wang, Guangchun

doi:10.3901/jme.2009.05.193

Cited by 7 publications

(6 citation statements)

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“…The maximal forging load of the deforming body is also one of the key parameters of determining a forming process and tool design. Ideally, the maximal forging load should be as small as possible because a smaller forging load requires a smaller forging facility and causes lower die stress [30,31].…”

Section: Maximal Forging Load (Fl)mentioning

confidence: 99%

The use of function-driven shape definition method and GRA–EMM-based Taguchi method to multi-criterion blade preform optimization

Liu

Zhou

2018

J Braz. Soc. Mech. Sci. Eng.

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For a blade with complex shape, preform design plays an important part in the quality of an achieved part in the forging process. So many optimization methods were developed in many researches to obtain an optimal preform. However, in these researches, they lack accuracy and efficiency in defining preform shape, and there is no systematical strategy of implementing multi-criterion optimization processes. In order to overcome these defects, a function-driven shape definition method was proposed in this paper. This method can transform geometrical shape into numerical variables which define geometrical shape easily and can be used in mathematical functions in such methods as Taguchi method and response surface method. Besides, a novel Taguchi method coupling with gray relational analysis (GRA) and entropy measurement method (EMM) was developed, which provides a systematic way of optimizing preforms from the perspective of multicriterion. In this method, GRA transforms multiple objectives into gray relational grade and EMM determines the weights of objectives. Finally, these two methods were applied in blade preform optimization to validate their effectiveness and efficiency. The results showed that the optimized blade was decreased by 16.6% in strain variance and by 20.2% in total load.

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Section: Maximal Forging Load (Fl)mentioning

confidence: 99%

The use of function-driven shape definition method and GRA–EMM-based Taguchi method to multi-criterion blade preform optimization

Liu

Zhou

2018

J Braz. Soc. Mech. Sci. Eng.

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“…Forming methods for hollow parts are also more and more widely used. In this context, it is worth mentioning cold extrusion methods which are more frequently used to produce parts for the automotive industry [ 10 , 11 , 12 ]. It must, however, be emphasized that these processes must be performed in several operations due to their complexity [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

A Rotary Compression Process for Producing Hollow Gear Shafts

et al. 2020

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This paper presents selected numerical and experimental results of a study investigating the process of forming hollow stepped gear shafts from tubes by rotary compression. The objective of the study was to determine whether the rotary compression process is an effective method of producing hollow stepped gear shafts and to identify limitations of this manufacturing method. A theoretical analysis involved the numerical modeling of the proposed process by the finite element method (FEM). 3D simulations were performed using the commercial simulation software package Simufact Forming. The analysis involved examining the material flow pattern along with thermal and force parameters of the process. The FEM results were verified with experimental tests conducted under laboratory conditions. The experiments were performed on a machine specially designed for the rotary compression of hollow parts. Results demonstrate that it is difficult to form a stepped gear shaft in one operation. For this reason, such parts should be formed in two operations. The first operation involves the forming of a hollow stepped shaft by rotary compression, while in the second operation, a gear is formed on one of the steps of the shaft.

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“…The temperature was in the different zone of the dimensional change based on the rules. Zhao et al [9,10] studied the relationship of the internal organization, the temperature, and the dimensional change based on the finite element analysis of the sensitivity analysis. The optimal parameters of temperature and dimension were obtained by taking the best internal organization as the standard.…”

Section: Introductionmentioning

confidence: 99%

The interplay between the measured dimension and temperature of hot large forgings

Zhang

et al. 2015

Int J Adv Manuf Technol

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During the forming process of hot forgings, the dimension and temperature are key parameters for improving the forging technology. In the paper, based on the mathematical physics methods, a mutual relationship model between the measured dimension and the temperature is proposed. This relationship model is displayed by the temperature field model and the dimensional model. Firstly, according to the law of conversation of energy, using the Dirichlet function and the measured dimension, the power-transfer function of heat source is established. Taking the measured temperatures as the boundary conditions, the temperature field model influenced by the dimensional change is established using the method of the moving virtual heat source. Secondly, based on the variation characteristics between the mesoscopic structure and the stress, using the function of the deformation energy is analyzed. Using the differential calculus of the pluralistic function, the dimensional change model influenced by the measured temperature is established. Based on the temperature field model and the dimensional model, this mutual relationship of the two ones can be clearly and directly displayed. Finally, the verifiable experiments and simulations are obtained using the forging experiments and the Deform-3D. Using the contrastive analysis method, the feasibility of the two relationship models is verified and the change trends of the dimension and temperature are analyzed. Combining the parameters of the forging technology in the thermal forming process, the application and the practical significance of the model are further cleared. The mutual relationship model provides a theoretical basis for improving the forging technology.

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Optimal Preform Die Shape Design through Controlling Deformation Uniformity and Deforming Force in Metal Forging

Cited by 7 publications

References 0 publications

The use of function-driven shape definition method and GRA–EMM-based Taguchi method to multi-criterion blade preform optimization

The use of function-driven shape definition method and GRA–EMM-based Taguchi method to multi-criterion blade preform optimization

A Rotary Compression Process for Producing Hollow Gear Shafts

The interplay between the measured dimension and temperature of hot large forgings

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