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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.
權赫洪,李正魯 대진대학교 2000 大眞論叢 Vol.8 No.-
The structure analysis of tapping M/C is developed to improve dynamic characteristics in this study. 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 22.74 Hz in the right column.
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.
권혁홍,정준호 한국지식재산교육연구학회 2020 지식재산 교육과 연구 Vol.8 No.1
최근 중국 내에서 K-브랜드의 인지도가 높아짐에 따라 많은 국내 기업들이 중국에 진출하고 있으나 상표와 같은 지식재산권에 대한 사전 검토나 준비 없이 중국 시장에 진출하는 경우가 많다. 이에 따라 중국의 상표 브로커들이 이를 악용해 상표를 미리 선점한 후 거래를 요구하거나 선점한 상표를 활용해 유사 사업을 진행하여 피해를 주는 등 상표분쟁으로 어려움을 겪는 사례들이 종종 발생하고 있다. 본 논문에서는 중국에서 악의적 상표 선점 사례들과 이에 대한 실제 기업들의 대응 결과, 상표법상 악의적 선점에 대응할 수 있는 제도 등을 통해 유사한 피해가 발생하지 않도록 하는 방안을 제시하고 실무적 차원에서의 시사점을 고찰한다. Recently, as K-brand's awareness in China has increased, many domestic companies have entered China. But they often entered the Chinese market without prior review or preparation for intellectual property rights such as trademarks. As a result, they had often difficulties in which trademark brokers in China were struggling with trademark disputes by exploiting them to preempt the trademark in advance, requesting a transaction, or conducting similar business using the preempted trademark to damage it. In this paper, we propose ways to prevent similar damages from the cases of malicious trademark preemption in China and actual companies' response to it, and a system that can respond to malicious preemption in the trademark law, and consider the implications at the practical level.
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.
權赫洪,金善浩 대진대학교 1994 大眞論叢 Vol.2 No.-
In this study the structure analysis of chamfering m/c is developed to improve dynamic characteristics To this purpose a chamfering 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 chamfering 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. this result
권혁홍,최선준 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.6
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 spec-ifications using basic theory and the expert's knowledge, and the design results arc 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 effec-tiveness of this program, two springs, of which one is symmetric, other asymmetric, arc designed and analyzed, and the outputs are compared to the experiments. Considering the tolerance of the given specifications, the results are good.
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.
권혁홍,이정로 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
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-work piece 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 insert by considering contact and interference effects under both mechanical and thermal loads.
권혁홍 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.1
In this study, a high-speed procedure to be used in composite molding technology is developed for the production of a hybrid supercapacitor in a progressive and revolutionary current in a production system, as are the related operating conditions. Mold parts with solid modeling, the ease of programming of future mold product designs, tolerance management, and pre-explode tests by the building of a progressive die design system using Cimatron_E10 Die Design Software for the strip layout are done. The capacity of the super-hybrid composite mold design will save time and money through its verification of the manufacture of molds. We plan to apply this to future related products for production cost savings of more than 30% achieved by considering the components of the production costs, labor, and material costs of production as compared to conventional production methods.