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굽은 T形 제품의 편심압출가공에 대한 상계굽힘해석과 DEFORM™-3D에 의한 굽힘해석 비교
진인태,김진훈,김한봉 釜慶大學校 1997 釜慶大學校 論文集 Vol.2 No.2
The kinematically admissible velovity field is developed for the analysis of the curving of an eccentric extrusion. The curving of product in extrusion is caused by the difference of the linearly distributed longitudinal velocity on the cross-section of the workpoece at the dies exit. The result of the analysis show that the curvature of product increases with the increase in ecentricity of gravity center of the cross-section of the workpiece at the die entrance from that of the cross-section at the die exit. It also increase with the die land dimension. By the DEFORM-3D analysis, the curving of T-shaped product in extrusion is changed by the eccentricity, die land length and the friction constant. The result of the analysis by DEFORM-3D software shows that the curvature of T-shaped product increases with the eccentricity. The two analysis and one experiment show the curving phenomenon in eccentric extrusion process.
사각형 단면을 가진 제품의 압출가공시 제품의 굽힘현상에 관한 연구
진인태 釜慶大學校 1996 釜慶大學校 論文集 Vol.1 No.2
A kinematically admissible velocity field is developed to analyze the curving phenomenon of extruded products. The curving of a product in extrusion is caused by the linearly distributed longitudinal velocity on the cross-section of the workpiece at the die exit. In the analysis, the longitudinal velocity in extrusion direction is divided into the uniform velocity and the deviated velocity. In order to satisfy the requirement of the kinematically admissible velocity field, the average value of the deviated velocity should be zero. At the same time, it should linearly change with the distance from the center of gravity of the cross-section of the workpiece. The results of the analysis show that the curvature of product increases with increasing eccentricity of gravity center of the cross-section of workpiece at die entrance from that of the cross-section at the die exit.
진인태 釜山工業大學校 1995 論文集 Vol.37 No.-
The kinematically admissible velocity field is developed for the analysis of extruded products. The curving of product in extrusion is caused by the linearly distributed longitudinal velocity on the cross-section of the workpiece at the die exit. In the analysis, the longitudinal velocity in extrusion direction is divided into the uniform velocity and the deviated velocity. In ordr to satisfy the requrement of the kinematically admissible velocity field, the average value of the deviated velocity should be zero. At the same time, it should linearly change with the distance from the center of gravity of the cross-section of the workpiece. The results of the analysis show that the curvature of product increases with increses in eccentricity of gravity center of the cross-section of workpiece at die entrance from that of the cross-section at the die exit.
진인태 釜山工業大學校 1993 論文集 Vol.35 No.-
This paper describes a study of introcuction of Computer Aided Process Design system to recta-ngular deep drawing process widely used in sheet metal forming operation. Computer Aided pro-cess design for metal forming operation needs consideration of plasticity characteristics of material, the selection and calculation of optimal operation conditions such as tool shape and limitation of pass division based on formability. The performance of that system are determination of blank shape and calculation of blank size and maximum drawing ratios at each operation type are calculated based on formability of sheet metal. The number of drawing steps from blank to product is calculated based on maximum dra-wing ratios and at each step tooling parameters such as punch radius, die radius, die clearance are calculated properly as optimal value.
김진훈,진인태 釜慶大學校 1998 釜慶大學校 論文集 Vol.3 No.2
The eccentric extrusion and bending process for the forming of the curved circular hollow tube is newly developed. Generally, the bending process of hollow tube is the secondary bending process followed by the extrusion process of the hollow tube from the round billet. But, many defects such as wrinkling and the difference of wall thichness can be occurred during the secondary bending process. On the basis of the facts about the curving phenomenon being able to occurred during the extrusion process, the new process for the bending is suggested by the control of the curvature of extruded parts during the extrusion process. From the results of the previous researches which the curving phenomenon during the extrusion process is caused by the eccentricity, the eccentric extrusion and bending process is applied to the U-bending of circular hollow tube. During being extruded to the circular hollow tube product from the circular hollow tube billet, the kinematically admissible velocity field between the dies surface and the internal plug boundary surface is developed. By the using this curving velocity field, the curvature of extruded products can be calculated with the parameters such as eccentricity, dies length, friction constant.