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염성호(Yeom Sung Ho),박현진(Park Hyun Jin),홍성인(Hong Sung In) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In the rigid-plastic analysis, forming analysis results are depends on the flow stress of materials. The flow stress are calculated by the material test such as a compression and tension test. The general FEM programs are used the flow stress of a tension test. But the flow stress in the forging using compression forming are not satisfied with the flow stress of a tension test. Especially in the hammer forging of the high strain rate, the flow stress are very different. In the FEM analysis, the flow stress are effect on fatigue lifes of the forging die. In this paper, the hot forging experimental material, the flow stress of the plasticine are calculated by the compression test. The preform was designed by Genetic algorithm analysis using the flow stress. through the experimental and FE analysis, know the effect of flow stree on preform design in hot forging.
염성호(Yeom Sung Ho),이병섭(Lee Byoung Seob),양형석(Yang Hyung Suk),김동락(Kim Dong Lak) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
ADRs are completely cooling devices with no external plumbing and no moving parts. They are particularly well suited to maintaining a constant-stage temperature, and their thermal cycle is easy to automate. A ADR consists of a paramagnetic salt, salt pill housing and Cu wire connected thermally to a paramagnetic salt. The salt’s entropy depends on both temperature and magnetic field. As the salt absorbs heat at a constant temperature, its entropy slowly increases. Temperature control is aided by the fact that raising or lowering the magnetic field causes heating or cooling with a very short time constant. In this paper, designed the SPH using analysis that consider ADR's cryogenic cooling cycle. The salt's temperature rely on the SPH height and a distance of Cu wire. the ADR's cryogenic cooling experimental and heat transfer analysis use to the basic data for design a distance of Cu wire and the SPH height.
남경오(Nam Kyoung O),염성호(Yeom Sung Ho),박현진(Park Hyeon Jin),홍성인(Hong Sung In) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The flow forming has been used to produce long thin walled tube parts, with reduced forming force and enhanced mechanical and surface quality for a good finished part, compared with other method formed parts. Therefore, spinning and flow forming techniques are used frequently in automotive, aerial, defense industry. Forming parameters effecting metal flow in the flow forming are lead angle, feed rate, thickness reduction ratio, mandrel revolution and material property etc. Especially, lead angle and feed rate of the working roller are important parameters for the formed metal flow. In this paper, finite element method analysis of one-roller two-path backward and forward flow forming is carried out to study effects of lead angle and feed rate on the formed workpiece geometry. Various lead angles and feed rates are applied in flow forming process analysis. As a result of analysis, build-up, bulging and bell-mouth dimensions on various forming conditions are obtained and compared with each analysis cases.
Composite-steel 접합을 위한 접착제의 강성과 온도변화에 따른 접착강도 특성
장승용(Jang Seung Yong),박현진(Park Hyun Jin),염성호(Yeom Sung Ho),이종호(Lee Jong Ho),남경오(Nam Kyoung o),우호길(Woo Ho Kil) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The large size construction which is joined by adhesion undergoes various temperature changes according to a change of environment temperature. Adhesion mechanical properties according to the temperature change of adhesives of a long term used construction is changed. In this paper, we get the mechanical property and adhesive strength property of two types adhesive, normal adhesive and thermal adhesive. The material property of adhesive was tested under the temperature change environment. Adherend materials are composed by a composite-steel. We know the used temperature of the two types adhesive.
남경오,염성호,박현진,홍성인 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
The flow forming has been used to produce long thin walled tube parts, with reduced forming force and enhanced mechanical and surface quality for a good finished part, compared with other method formed parts. Therefore, spinning and flow forming techniques are used frequently in automotive, aerial, defense industry. Forming parameters effecting metal flow in the flow forming are lead angle, feed rate, thickness reduction ratio, mandrel revolution and material property etc. Especially, lead angle and feed rate of the working roller are important parameters for the formed metal flow. In this paper, finite element method analysis of one-roller two-path backward and forward flow forming is carried out to study effects of lead angle and feed rate on the formed workpiece geometry. Various lead angles and feed rates are applied in flow forming process analysis. As a result of analysis, build-up, bulging and bell-mouth dimensions on various forming conditions are obtained and compared with each analysis cases.