• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.251-254
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• 2000

In this paper, we developed an automated program for the modeling and manufacturing of three-dimensional roller gear cams. A computer program employing the theory of gearing and coordinate transformation is developed for synthesizing and animating cam mechanisms. A method using wire frame modeling and shading by triangular element is presented, and effectively used for modeling of example with reduced computation time. Then a module for generation NC program for a five-axis CMC machine to manufacture roller gear cam is established.

• 한국공작기계학회논문집
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• 제17권4호
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• pp.1-7
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• 2008

Fine grained superplastic Zn-22%Al alloy was extruded using a laser machined micro-die to produce a micro-gear shaft. Extrusion process was conducted under a constant pressure at constant temperatures ranging from 503 to 563K. Laser machining was capable to machine a micro-die with close tolerances and adequate surface quality. The extrusion rate increased with extrusion load under constant extrusion temperature. The rate reached a steady state and became constant after a certain period. There was a small instantaneous stroke on application of the load and then a very brief primary stage which preceded steady-state flow. The micro-extrusion process was proven to produce a micro-gear shaft successfully using a fine grained superplastic Zn-22%Al alloy.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1994년도 춘계학술대회 논문집
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• pp.129-136
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• 1994

Differential side bevel gears have been produced by machining process, but recently cold forging process for the bevel gear is under development in domestic industry. This study presents the possibility to form not only bevel gear but also spline gear at the same time using the experiment and numerical analysis. The preform shape is designed to form both bevel gear and spline gear simultaneously by the backward tracing scheme of the rigid-plastic finite element method(FEM). The experimental results confirm that the numerically-designed preform is satisfactory to form both bevel gear and spline gear. It is noted that the backward tracing scheme is helpful in designing preforms.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 춘계학술대회 논문집
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• pp.13-14
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• 2010

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.460-463
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• 2005

Gear is an important machine element to be used transmission in case short between axis. We drew gear using automatic design program to solve problem when it draw gear. We manufactured gears that it have different pressure angles using W-EDM. And we got a 2D profile of manufactured gear using reverse engineering. So we got to manufacturing error in comparison with CAD data and measured data. In result we could manufacture precise gear through improvement of manufacturing processes.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.756-757
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• 2006

P/M enables the economical production of components for many kinds of gears. Functionally, the sub gear requires high tooth accuracy and bending fatigue strength. The whole tooth profile was sized after sintering to satisfy the gear tooth accuracy specification. The part was redesigned to reduce machining requirements. The required bending fatigue strength was achieved through appropriate material choice and induction of compressive residual stress by shotpeening after carburizing. The P/M sub gear replaced a forged steel gear, satisfied performance requirements, expanded the use of P/M applications and provided over 30% cost reduction.

• 소성∙가공
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• 제19권5호
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• pp.283-289
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• 2010

Extrusion process in the bulk material for fabrication of miniature helical gears has problems such as a high forming load and short tool life because the cross-section is complex and asymmetry. To overcome these problems, in this study, miniature helical gears were fabricated by Zn-22Al powder hot extrusion. The included die angle for minimum extrusion load and improving die filling was determined by FE-simulation. The Zn-22Al spheroidal powder produced by gasatomization were compacted and sintered for extrusion experiment. The dimension of helical-gear is 0.3mm in module, 3.35mm in pitch diameter, $15^{\circ}$ in helix angle and the number of teeth is 12. All of the extrusion experiments were performed with internal helical gear die which was machined by precision electric discharge machining using the electrode. The experiment was conducted at $190^{\circ}C$ to $310^{\circ}C$ to obtain extrusive and mechanical properties. The extruded helical gears were analyzed through extrusion load, Vickers hardness and SEM images for each extrusion temperature. The powder hot extrusion process was successfully applied to fabricate a miniature helical gear.

• 한국융합학회논문지
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• 제2권2호
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• pp.27-34
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• 2011

본 연구는 호빙 가공공정 없이 워엄 휠 기어 형상을 만들기 위한 워엄 휠의 개발을 위한 제품을 만드는 것이다. 호빙 가공 공정이 없기 때문에, 증가된 생산성과 등가의 품질을 가지는 플라스틱 워엄 휠이 결국 만들어지게 된다. 그 결과, 이 제품은 현대 모비스, 만도, TRW, KOYO/NSK/Showa(Japan), Delphai(Amercia)에 판매 될 것이다. 핵심 기술 및 전략은 다음과 같다. 워엄 휠의 성형을 위한 기술 보호는 최근 "헬리컬 기어(No. 10-2008-0105908) 성형"이 특허 공정으로 되어 있다. 나아가, "보스 삽입을 위한 위치 결정을 위한 성형 시스템"을 위한 특허 절차가 준비 중이다. 기어 기계가공 절차 없이 호빙 머신에 기어 성형 절차로서, 무엇보다 먼저, 기어를 만드는 코어 개발 기술이 주된 주제이다. 따라서, 코어 및 성형 기초가 초기 순서로 개발되지 않아서, 현재 개발되는 워엄 휠의 경우, 기어는 이차적으로 호빙 M/C로 기계가공 된다. 최종적으로는, 성형 기초 구조체를 위한 특허가 본 연구결과로 만들어질 예정이다.

• 한국기계가공학회지
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• 제19권10호
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• pp.24-30
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• 2020

The high speed of an engine balance box may cause significant additional gear noise. Gear accuracy is the most useful key to reduce gear noise, but the small tooth width and thin-walled anti-backlash gear introduce challenges to the manufacturing process. In order to reduce the gear noise caused by gear pitch error, this paper investigates the correlation between influencing factors and gear pitch error by analyzing the processing technology, tooling fixture, and equipment accuracy. By improving the process and optimizing the gear design, the gear machining accuracy was improved and the processing cost was saved.

• 소성∙가공
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• 제23권5호
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• pp.275-281
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• 2014

Broaching is widely used for the machining of inner shaped slots in work-pieces. The broach tool is moved vertically (usually by hydraulic power) through the work-piece. Broaching occurs with the work-pieced fix while the broach tool traverses through material and shears it. To produce a T/F driven gear both an outside cutting and an inside cutting are needed. The outside cut determines the tooth profile and the inside cut determines the inner dimension. Broaching can cause problems with concentricity. In the current study, the characteristics of shearing along the cutting blade and the broaching of a T/F driven gear are considered.