• 한국추진공학회:학술대회논문집
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• 한국추진공학회 1999년도 제12회 학술강연회논문집
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• pp.26-26
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• 1999

가장 오래된 금속성형법 중의 하나인 열간 단조는 재결정온도-고상선(강재의 경우, 일반적으로는 1,200-l,28$0^{\circ}C$)의 온도로 재료를 가열하여 간단한 형상의 소재로부터 하나 또는 둘 이상의 공정을 통하여 최종제품을 생산해내는 소성가공법이며, 이것은 절삭 가공에 비하여 재료의 손실이 적으며, 생산속도가 빠르고 또한 단류선(flow line)의 방향으로 인장강도, 충격강도 등의 기계적 강도가 커야 할 필요가 있는 제품의 대량 생산에 적합한 가공법이다.

• 한국산학기술학회논문지
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• 제9권2호
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• pp.327-332
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• 2008

본 논문에서는 반도체 소자와 디스플레이 패널의 제조공정에 사용되는 플라즈마 식각장비의 RF 정합특성을 개선하기 위한 모듈을 제안하였다. 구동부의 기구 중 베벨기어를 웜기어로 새롭게 설계 제작하고 제어부도 원칩 마이크로 프로세서를 이용하여 재구성하였다. 개발된 모듈은 기존의 정합장치보다 다양한 공정변수에 대한 능동적인 대처가 가능하고, 모터의 흐름현상 등을 개선함으로서 RF 정합특성이 개선되어, 플라즈마 식각공정의 생산성을 향상시킬 수 있음을 보였다.

• 한국기계가공학회지
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• 제13권1호
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• pp.45-51
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• 2014

Generally, marine transmissions contain straight shafts and helical gears, meaning that enginerooms require more space. In order to guarantee a levelengine space for conical involute gears or beveloid gears, both of which are important machine parts, a conical gear was used to replace the traditional cylinder gear. Owing to weak points such as the point contact phenomenon of the teeth, a limitation of the width of each tooth in terms of the addendum, the variational modification coefficient,and the difficulty of processing, research about conical involute gears remains at a standstill. Along with the increasing number of applications of conical involute gears, research on conical gear design technology is necessary. In this paper, in an effort to enhance conical gear design technology, research on the 3D modeling and stress analyses of helical conical involute gears were done.

• 한국기계가공학회지
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• 제13권2호
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• pp.100-107
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• 2014

Currently, there are many power transmission devices, including gears, friction wheels, chains, and belts. Because the power transmission of gears is most certainin these devices, gears are widely used in different power transmission fields and environments. In accordance with the gear shape, gears can be classified as cylindrical gears and conical gears. A cylindrical gear, which provides a means of power transmission under parallel axis and skewed axis conditions, contains a spur gear, a helical gear and a worm gear. A conical gear, which can be used on a skewed axis as well as parallel and crossed axes, includes a bevel gear(e.g., straight bevel, spiral bevel, hypoid gear) and a conical involute gear(or a bevel oid gear). In this paper, a conical involute gear which utilizes the fabrication method of other involute gears such as spur and helical gears using a CNC hobbing machine is discussed.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2007년도 춘계학술대회 논문집
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• pp.144-148
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• 2007

In this paper, we present a systematical procedure to develop a precision enclosed die forging process for a bevel gear of a passengers' car. The detailed procedure involves bear gear CAD modeling, process design and CAE simulation, CAM and die making, material preparation, and prototype manufacturing using both the technologies and machines accumulated and equipped in the technology innovation center(TIC) of Gyeongsang National University. It is demonstrated that the presented approach guarantees bevel gears with the second KS grade quality, which can be used for the differential gear of the passengers' car.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2007년도 춘계학술대회 논문집
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• pp.42-47
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• 2007

The characteristics of the tool system give many effects into the costs and qualities for the finished components. Therefore, a tool life is one of the important issues on cold forging industry. However, since variables related with tool life are many complicated, the studies for solution should be investigated by the systematic research approach. The shape and process changes of die, the hardness changes of material and the tolerance of dies to decrease the die stress are analyzed by the FEM software. The heat-treatment of tool material is investigated to improve the tool life. Deep cryogenic treatment of tool steel is very efficient to improve the wear resistance due to the fine carbide. And, it is investigated that the shape and dimension of tool give effect into both tool life and quality of forged product..

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2001년도 추계학술대회 논문집
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• pp.244-247
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• 2001

Lubricanting characteristics in the warm forging have influence on forgeability of products. but Research on deformation characteristic of warm forging on the lubricant and lubricating method lack. This paper deform a bevel gear by warm forging and evaluate deformation loads and quality of products by each lubricants and lubricating method using oil-based lubricants(Soy, Oildag) and water-based lubricants(Deltaforge $\#31$, Renite S-26-X, Deltaglaze $\#151$). In conclusion, the less a deformation load by lubricants the more improvement a quality of product in manufacture of a bevel gear and water-based lubricants in the warm forging reduce a deformation load and improve a quality of products. Especially, Deltaforge $\31$ have excellent characteristic in the warm forging.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 추계학술대회논문집
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• pp.43-46
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• 2003

To develop bevel gear dies that have characteristics of high precision and enough life time, the technology of die manufacturing and design which increase the resistance of wear and fatigue is essentially needed. Here in the study, we have investigated several materials for dies and electrode. And, the most economical and suitable electrode material has been selected through the characteristic analysis of electrode materials such as copper, graphite and chromium copper. With the help of CAD/CAM/CAE, the total manufacturing system of high precision electrode for bevel gear has been established.

• 소성∙가공
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• 제12권3호
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• pp.221-227
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• 2003

Heat treatment is widely used in various manufacturing Processes to enhance the quality of a Product such as strength, surface hardness, and service life. In the heat treatment, there is dimensional change or distortion of the product, which critically influences the dimensional accuracy of precision parts. In this study, the distortion of a straight bevel gear induced by heat treatment is investigated in two cases. In the first case, the distortion induced by heat treatment we compared between a forged bevel gear and a machined bevel gear. In the second case, the distortion of an annealed gen is compared with that of a quenched gear. And finite element analysis has been Performed to predict the distortion of a heat-treated and machined bevel gear. The predicted values are compared with the experimental values.

• 한국정밀공학회지
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• 제25권11호
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• pp.73-82
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• 2008

A dynamic model of reducer for generating facility of electric pourer having bevel gear pair and planetary gear train is developed by lumped method. The model accounts for the shaft and bearing flexibilities, gyroscopic effects and the force couplings among the transverse and torsion motions due to gearing. Vibration/noise analysis as well as strength of bevel gear pair and planetary gear train are considered. Exciting forces of high reducer for generating facility of electric power areconsidered as the mass unbalance of the rotors, misalignment and a function of gear transmission error. A Campbell diagram, in which the excitation sources caused by the mass unbalance of the rotors, misalignment and the transmitted errors of the gearing are considered, shows that, at the operating speed, there are not critical speed.