전주기법 홀로그램이 부가된 금속패턴붙박이 도어 제작

권혁홍 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.1

I developed a high-quality metal door with a hologram-pattern design using a high-speed electroforming process. In this study, the major processes were master production, conducting grant, nickel-sulfamate acid electroforming, ablation treatment, and final dressing. The processing system was provided with a nickel sulfamate pole, and a rotary-pole PP-plating jig in a circular tank. This approach could reduce defects and errors, as much as possible, by its use of a hologram pattern to create the master of a metal door. The thin-sheet metal-creation process for the door built-in metal pattern using electroforming with hologram was successful.

Hexagonal 인서트용 열간압출 금형설계

권혁홍,이정로 한국생산제조학회 2001 한국생산제조시스템학회 학술발표대회 논문집 Vol.2001 No.4

CATIA를 이용한 고속가공용 탭핑머신의 구조해석

권혁홍,김지용,하종국 대진대학교 2002 大眞論叢 Vol.10 No.-

In this study the structure analysis of tapping m/c is developed to improve dynamic characteristics. To this purpose a tapping m/c is mathematically modelled and dynamic response analysis of the model are investigated by use of Finite Element Method(FEM). The investigation procedures are as follows. The finite element modelling of the tapping m/c is done with triangular and rectangular plate elements and each node of the elements has 6 degrees of freedom. And this model is idealized as a forced vibration system under impulse load by cutting force. Model parameters, natural frequency and mode shape, and dynamic response for displacement and stress are analyzed by use of mode superposition method. To reduce computing time of dynamic response analysis, lower vibration mode is analyzed with master-DOF and mass participation factor. In this case maximum relative displacement is occured at 17.483 Hz in the right column.

전주기술을 이용한 로터리스크린 제조에 관한 연구

권혁홍,박상호 대진대학교 2004 大眞論叢 Vol.11 No.-

To simple the manufacturing process of rotary screen, this study was adopted electroforming technology and produced silicon rubber mandrel. Furthermore, to indicate the optimal condition for the acquisition of high-qualified rotary screen product, the experiment was executed with pH, time, sulfamate nickel solution according to density which were the main factors to decide the condition, then compared it with the product made by original "S" Company in Holland. As a result, the figure of Hole was more obvious and correct. Also the open size increased more than 2-3%.

세라믹 인서트를 이용한 단조 금형설계

권혁홍 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.3

The use of ceramic inserts in steel forging tools offers significant technical and economic advantages over other materi-als of manufacture. These potential benefits can however only be realised by optimal design of the tools so that the ceramic asserts are not subjected to stresses that lead to their premature failure. In this paper the data on the loading of the tools is determined from a commercial forging simulation 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 forging process. The stress analysis of the dies is used to determine the stress conditions on the ceramic insert by considering contact and interference effects under both mechanical and thermal loads. Simulation results have been validated as a result of experimental investigations. Laboratory tests on ceramic insert dies have verified the superior performance of the Zirconia and Silicon Nitride ceramic insert in order to prolong maintenance life.

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.

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.

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.