Search | Korea Science

Lim, S.;Koh, D.H.;Kim, S.D.;Song, D.J.
- Proceedings of the Korean Society of Propulsion Engineers Conference
- /
- 2008.03a
- /
- pp.756-760
- /
- 2008
Optimum shape of Double-cone supersonic inlet is studied by using numerical methods. Double-cone intake shape is used for the design optimization study. And the total pressure recovery at the exit is used to assess the aerodynamic performance of the inlet.
PDF

Kim B. J.;Kim D. K.;Kim D. J.;Moon Y. H.
- Transactions of Materials Processing
- /
- v.14 no.9 s.81
- /
- pp.756-763
- /
- 2005
The applicability and productivity of hydroforming process can be increased by combining pre- and post-forming processes such as the bending, piercing and embedding process. For the fabrication of automotive parts, the hollow bodies with connecting nuts are widely used to connect parts together. Hollow body with connecting nuts has been conventionally fabricated by welding nuts or screwing in autobody screws. It requires multiple steps and devices fur the welding and/or screwing Therefore in this study, hydro-embedding process that combines the hydraulic embedding of connecting element(nut) with hydroforming process is investigated. Studies on the hydro-embedding technology have been performed to optimize the shape of the connecting element by analyzing the deformed mode of the embedded tube The effects of the shape of the screw tip, screw thread and shape of thread on the connection force between the tube and the connecting element have been investigated to optimize the shape of connecting element. Finite element analysis has also been performed to provide deformation behaviors of the tube surrounding a hole produced by hydro-embedding.
https://doi.org/10.5228/KSPP.2005.14.9.756 인용 PDF KSCI

Park, K.S.;Kim, B.J.;Jang, J.H.;Moon, Y.H.
- Proceedings of the Korean Society for Technology of Plasticity Conference
- /
- 2006.05a
- /
- pp.211-214
- /
- 2006
The outer race of the constant velocity(CV) joint is an important load-supporting automotive part, which transmits torque between the transmission and the wheel. The outer race is difficult to forge, because its shape is very complex and the required dimensional tolerances are very stringent. Therefore, the internet based shape inspection system is developed in this study to provide quick and accurate data through the easy control from users. Proposed system uses mechanical displacement sensors to measure the shape of CV joint that has six inner ball grooves, and commercially available Lab-View program is used to process measured data into the dimensional shape. Developed program provides a simple user interface that enables users real-time access of data measured from industrial production lines. Furthermore, it can exchange measured data via the internet between users and forging system operators. A java applet helped the system connection via internet. A data, IP access, is transmitted to the packet by TCP/IP. Our proposed system has many advantages over current measuring systems including fast and efficient data processing by real-time control, and system flexibility.
PDF

Yeom J.T.;Park N.K.;Lee Y.H.;Shin T.J.;Hong S.S.;Shim I.O.;Hwang S.M.;Lee C.S.
- Proceedings of the Korean Society for Technology of Plasticity Conference
- /
- 2004.05a
- /
- pp.114-117
- /
- 2004
The isothermal forging design of a Ti-6Al-4V wing shape was performed by 3D FE simulation. The design focuses on near-net shape forming by the single stage. The process variables such as the die design, pre-form shape and size, ram speed and forging temperature were investigated. The minimization of forging load and uniform strain distribution in a given forging condition were considered as main design factors. The FE simulation results fur the final process design were compared with the isothermal forging tests. Finally, the modified process design for producing the uniform Ti-6Al-4V wing product without forming defects was suggested.
PDF