나선형기어 냉간압출금형의 파손해석

권혁홍 대진대학교 생산기술연구소 2000 생산기술연구소 논문집 Vol.3 No.-

This paper suggests to predict the failure of helical gear extrusion die. The basic assumption that constitutes the framework for any combined stress failure theory is that failure is predicted to occur when the maximum value of stress becomes equal to or exceeds the value of the same modulus that produces failure in a simple uniaxial stress test using the same material. The stresses which were calculated to each critical points are applied maximum normal stress theory and distortion energy theory. The theoretical analysis and experimental results for Samanta process and New process dies were compared. 주요기술용어 : Failure Analysis(파손해석), Cold Extrusion Die(냉간압출 금형), 최대수직응력 이론(maximum normal stress theory), 비틀림에너지이론(distortion energy theory)

냉간단조 금형설계에서의 탄성변형 분석에 관한 연구

권혁홍,송승은 한국특허학회 2011 특허학연구 : 한국특허학회지 Vol.13 No.2

CAE 팩캐지를 利用한 기어 金型의 强度解析에 關한 硏究

權赫洪 대진대학교 1993 大眞論叢 Vol.1 No.-

In forging die design, pre-stressing is useful in preventing excessive tensile circumferential stresses which may cause die failure during forming. The finite element analysis (F.E.A) package ANSYS reversion 4.4A was used to this study F.E.A., that is, static analysis was accomplished for insert-dies of helical gear. Die model was constructed with 8 node isoparametric solid finite, elements. Static load analysis was performed for internal and outer pressure Also, stress distribution and deformed shapes are shown. Results of the F.E analysis and failure analysis for Samanta and new process dies were compared. The results of F.E Analysis were in good agreement with that of experimental results. It is expected that the results of this study can be applied to designing various kinds of extrusion gear die.

겹판스프링의 設計프로그램 開發에 관한 硏究

權赫洪,崔善準 대진대학교 1994 大眞論叢 Vol.2 No.-

Springs for vehicle suspension control the vibration of a car and influence on the ridability, safety, and life of a car In the paper, the computer aided design program has been developed, which design the leaf spring shape from the given specifications using basic theory and the expert's knowledge, and the design results are checked by the analysis theory in order to increase the accuracy, and feed back to the design input For the purpose of easy use, this program consists of pull-down menu and interactive input mode To prove the effectiveness of this program, two springs, of which one is symmetric, other asymmetric, are designed and analyzed, and the outputs are compared to the experiments. Considering the tolerance of the given specifications, the results are good.

인텀샤프트 일체형 유니버셜 파이프 조인트용 다단조금형의 단조공정해석

권혁홍,문관진,송승은,Kwon, Hyuk-Hong,Moon, Kwan-Jin,Song, Seung-Eun 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.3

This study was aimed at the design of the dies for the unified pipe joint of the intermediate shaft using the computer simulation to shorten the period of production, on the basis of the process planning which was designed by the field experts. In the computer simulation, 'Deform-3d' and 'eesy-DieOpt' have been used, which are the commercial process analysis and die design program. Through the process analysis, we could know the propriety of the forming process, the inner pressure of the die and the suitable fitting pressure between the insert and the sleeve which was not showing any positive tangential stresses in the insert. Through the simulation of die design, we could know the number of the stress ring, the diameter ratios, the stresses of the die, the shrink fitting tolerance and temperature in the condition of the already determined maximum outer die diameter of the multi-stage former. The validity of the die design using the computer simulation was analyzed by the experiments and the results were satisfactory. As the results of this study, the new and easy die design system for multi-forging has been developed.

박판스프링 교정시스템 구축에 관한 연구

권혁홍,김선호 대진대학교 1997 大眞論叢 Vol.5 No.-

This paper describes that study which construct a theoretic and experimental algorithm in order to make the automatic correction system of detent spring, and when load for correction pressed at spring, it can be found elastic and plastic deformation quantities by Finite Element Analysis. As a result, it has been found that the simulation datas are in good agreement with experimetal results.

반쪽 롱테이퍼 스프링과 공기스프링의 조합시 특성해석 연구

권혁홍,최선준 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.5

Air spring has the advantages to be nearly constant in natural frequency in spite of load change, and to be able to control height level. Half-long taper string has the advantages to function as well link as spring. Thus to utilize two type spring's advantages, half-long taper spring and air spring are combined and used. In this study, the theory to calculate the characteristics in combination is developed.

동부스바 인발 금형설계

권혁홍,이정로 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.4

Copper bus-bar is made by drawing process and used in many part of industry. When design drawing die for copper bus-bar, design factor is focused on the deformation of die-land by drawing force and shrink fit. In this paper it is analyzed to determine shrink fit value by shrink fit analysis program which is used with APDL/UIDL language in a commercial FEM package, ANSYS. The shrink fit analysis has been developed that enables optimal design of the dies taking into account the elastic deflections. Elastic deflection is generated in shrink fitting the die inserts and that caused by the stresses generated using DEFORM software for drawing process analysis. This data can be processed as load input data for a finite element die-stress analysis. Process simulation and stress analysis are thus combined during the drawing die design. The stress analysis of the dies is used to determine optimized dimension of die-land.

Hexagonal 인서드용 열간압출 금형설계

권혁홍,이정로 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1

The use of hexagonal ceramic inserts for copper extrusion dies offers significant technical and economic advantages over other forms of manufacture. In this paper the data on the loading of the tools is determined from a commercial FEM package as the contact stress distribution on the die-workpiece interface and as temperature distributions in the die. This data can be processed as load input data for a finite element die-stress analysis. Process simulation and stress analysis are thus combined during the design, and a data exchange program has been developed that enables optimal design of the dies taking into account the elastic deflections generated in shrink fitting the die inserts and that caused by the stresses generated in the process. The stress analysis of the dies is used to determine the stress conditions on the ceramic inset by considering contact and interference effects under both mechanical and thermal loads.

헬리컬기어 냉간압출금형의 파손해석

권혁홍 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.2

This paper suggests to predict the failure of helical gear extrusion die. The basic assumption that constitutes the frame-work for any combined stress failure theory is that failure is predicted to occur when the maximum value of stress becomes equal to or exceeds the value of the same modulus that produces failure in a simple uniaxial stress test using the same material. The stresses which were calculated to each critical points are applied maximum normal stress theory and distor-tion energy theory. The theoretical analysis and experimental results for Samanta process and New process dies were com-pared.