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- 검색키워드
- 저자 : Trung Dac Nguyen (검색결과 4 건)
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Thu Thi Nguyen,Trung Nguyen Dac 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.2
Forming process and product quality in hydroforming of sheet metal have been considered to be significantly influenced by numerous technological parameters, and one of those is blank holder pressure. This parameter keeps an important role in not only maintaining stability on rim of workpiece but preventing leakage of high-pressure liquid as well. In this paper, a parametric study was conducted to investigate a relationship between the blank holder pressure and forming pressure during the shaping process. Moreover, effect of the blank holder pressure on product quality was also experimentally scrutinized through thinning and real shapes of different finished products. The researched object was chosen to be a cylindrical cup made of steel DC04 with various thicknesses. The experiments were implemented for two cases of the blank holder pressure during forming process: constant and varied pressures. The results indicate a covariant relationship between the blank holder pressure and forming pressure. Furthermore, it should be noted that the forming pressure can be maintained at higher values in the case of varied blank holder pressure, thereby improving shape quality and thinning rate of the product. The relationship between two types of pressure as well as impact of the blank holder pressure on the bottom radius and the maximum thinning of the product is demonstrated as functions through empirical studies. This study is believed to make contribution to optimizing technological parameters within forming process to manufacture high-quality products.
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On the High Fluid Pressure in Hydrostatic Forming for Sheet Metal
Thu Thi Nguyen,Trung Dac Nguyen 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.12
In hydrostatic forming, technological parameters have a significant influence on the thin shell product formation. One of the most important factors is the forming liquid pressure. This pressure exerts directly on the workpiece, pulling the workpiece closely to the die’s profile. Therefore, this parameter should be kept large enough for shaping the product with the required shape and size. In practice, however, it is very difficult to achieve and maintain the high value of this parameter. In addition, it is also necessary to set up a mathematical model of this parameter to support the calculation and control. This paper has suggested a simple solution for maintaining fluid pressure during forming. The solution has been applied into the experimental system. Using this system to investigate forming liquid pressure parameter, the paper has given a suitable mathematical model when shaping cylindrical details from sheet metal. The results of the study contribute to data in die design, parameter calculation and control as well as forming process stabilization in hydrostatic forming for sheet metal.
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Solid-State Scrolls from Hierarchical Self-Assembly of T-Shaped Rod–Coil Molecules
Hong, Dong-Je,Lee, Eunji,Jeong, Haemi,Lee, Jeong-kyu,Zin, Wang-Cheol,Nguyen, Trung Dac,Glotzer, Sharon C.,Lee, Myongsoo WILEY-VCH Verlag 2009 Angewandte Chemie Vol.48 No.9
<P>On a roll: Attachment of flexible coils to the middle of a rigid rod generates T-shaped rod–coil molecules that self-assemble into layers that roll up to form filled cylindrical and hollow tubular scrolls, depending on the coil length, in the solid state (see picture); the rods are arranged parallel to the layer plane. <img src='wiley_img_2010/14337851-2009-48-9-ANIE200804307-content.gif' alt='wiley_img_2010/14337851-2009-48-9-ANIE200804307-content'> </P> <B>Graphic Abstract</B> <P>On a roll: Attachment of flexible coils to the middle of a rigid rod generates T-shaped rod–coil molecules that self-assemble into layers that roll up to form filled cylindrical and hollow tubular scrolls, depending on the coil length, in the solid state (see picture); the rods are arranged parallel to the layer plane. <img src='wiley_img_2010/14337851-2009-48-9-ANIE200804307-content.gif' alt='wiley_img_2010/14337851-2009-48-9-ANIE200804307-content'> </P>
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