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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.
남경오(Nam Kyoung O),염성호(Yeom Sung Ho),박현진(Park Hyeon Jin),홍성인(Hong Sung In) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
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.
다양한 롤러 단면형상을 적용한 유동성형의 성형력에 관한 평가
남경오(Nam Kyoung O),원종호(Won Jong Ho) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
The flow fanning has been used to produce long thin walled tube parts, with reduced fanning force and enhanced mechanical and surface quality for a good finished part, compared with other method formed parts. Therefore, flow forming technique is used widely in industrial production. Spinning and flow forming techniques are used frequently in automotive, aerial, defense industry. Factors for the flow forming machine design are consist of motor power, bed rigidity, mandrel stiffness, spindle power, roller profile, etc. Especially, mandrel, spindle power and roller are important factors for flow forming machine capacity. In this paper, three dimensional finite element method analysis of one-roller backward flow forming of a workpiece is carried out to study effects of roller profile on forming force. Applied roller profile have roller lead geometries of angle 20°, 30°, 40°, concave and convex. Axial and radial forming forces on various roller profiles are obtained and compared with each analysis cases.
다양한 롤러 단면형상을 적용한 유동성형의 성형력에 관한 평가
남경오(Nam Kyoung O),원종호(Won Jong Ho) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The flow fanning has been used to produce long thin walled tube parts, with reduced fanning force and enhanced mechanical and surface quality for a good finished part, compared with other method formed parts. Therefore, flow forming technique is used widely in industrial production. Spinning and flow forming techniques are used frequently in automotive, aerial, defense industry. Factors for the flow forming machine design are consist of motor power, bed rigidity, mandrel stiffness, spindle power, roller profile, etc. Especially, mandrel, spindle power and roller are important factors for flow forming machine capacity. In this paper, three dimensional finite element method analysis of one-roller backward flow forming of a workpiece is carried out to study effects of roller profile on forming force. Applied roller profile have roller lead geometries of angle 20°, 30°, 40°, concave and convex. Axial and radial forming forces on various roller profiles are obtained and compared with each analysis cases.
남경오(Nam Kyoung O),김범년(Kim Bum Nyun),원종호(Won Jong Ho) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.4
The flow forming has been used to produce long thin walled tube parts, with the reduced forming force and the enhanced mechanical and surface quality for a good finished part, compared with the formed parts using other method. Therefore, flow forming technique is used widely in industrial production. Spinning and flow forming techniques are used frequently in automotive, aerial and defense industries. The main factors for the flow forming machine design are motor power, bed rigidity, mandrel stiffness, spindle power, roller profile, etc. Especially, mandrel, spindle power and roller are important factors for flow forming machine capacity. In this paper, three dimensional finite element method for analysis of one-roller backward flow forming of a workpiece has been carried out to study effects of roller profile on forming force. Applied roller profile have roller lead geometries of angle 20°, 30°, 40°, concave and convex. Axial and radial forming forces on various roller profiles are obtained and compared with each analysis cases.
최우석(Woo-Seok Choi),남경오(Kyoung-O Nam),방경식(Kyung-Sik Bang),이주찬(Ju-Chan Lee),서기석(Ki-Seog Seo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
According to IAEA regulations, a transport system of radioactive material should be subjected to the impact test, which is one of hypothetical accident conditions. Impact limiters attached to a transport cask absorb the impact energy. So, it is appreciated to determine properly the shape, size and material of impact limiters. A material data needed in this determination is a dynamic one. In this study, several materials considered as those of impact limiters were tested by a drop weight equipment to acquire dynamic material characteristics data. Impact absorbing volume of the impact limiter was derived mathematically for each drop condition. A size optimization of impact limiter was conducted. The derived impact absorbing volumes were applied as constraints. These volumes should be less than critical volumes generated based on the dynamic material characteristics. The derived procedure to decide the shape of impact limiter can be useful at the preliminary design stage, where the transport system's outline data are roughly determined and applied as input values.
장승용(Jang Seung Yong),박현진(Park Hyun Jin),우호길(Woo Ho Kil),남경오(Nam Kyoung O) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
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. The forming parameters affecting metal flow and forming force in the flow forming are lead angle, feed rate, thickness reduction ratio, mandrel revolution and material property etc. Especially, lead angle, feed rate of the working roller, build-up and thickness reduction ratio are important parameters for the flow forming. In this paper, one-roller backward flow forming analysis is carried out to study effects of the build-up creation affecting the contact area. The forming force is related to the contact area between roller and workpiece. To calculate accurate contact area and forming force, the geometric method and numerical analysis was proposed in this paper.
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.