• 한국기계가공학회지
• /
• 제17권3호
• /
• pp.87-92
• /
• 2018

As gas turbines for power generation become increasingly more important for high capacity and high efficiency, the technological development and investment of companies are increasing globally. Gas turbine manufacturing technology is only owned by a few companies such as GE, Siemens, and MHI, and our country currently depends on imports of processing technology and component parts. The core part of the gas turbine is curvic coupling tooth processing technology that improves turbine efficiency by smoothly transmitting power to the turbine rotor. Curvic coupling tooth machining and evaluation research is restricted overseas, and it is not underway in Korea. Therefore, in this study, roughing and finishing process technology for curvic coupling tooth machining is developed and a quantitative evaluation method is proposed. For the development of machining technology, the analysis of critical parameters was performed through C & E analysis. In the roughing process, the conditions considering the minimum machining time and tool load ratio were determined. Finishing process conditions were determined based on the contact ratio between the tooth surfaces. The image-processing method is presented for evaluation of the contact ratio and a verification test was performed.

• 한국추진공학회:학술대회논문집
• /
• 한국추진공학회 2009년도 춘계학술대회 논문집
• /
• pp.22-25
• /
• 2009

본 연구에서는 커빅커플링의 설계, 구조해석, 고온 비틀림시험 및 실형상 축-디스크를 제작/조립성 검토를 통해 터보펌프 터빈에의 적용 가능성을 타진하였다. 커플링의 치형은 Gleason 치형을 기본형상으로 하여 설계운용조건의 1.5배의 토크값을 기준으로 설계를 진행하였다. 구조해석 및 고온비틀림 시험을 통해 하중조건하의 안정성을 확인하였으며 특히 비틀림시험 후 커플링의 변형은 미미함을 확인하였다. 커빅커플링을 적용한 실형상 디스크 제작 및 조립시험을 통해 설계요구조건을 하회하는 디스크의 외주 및 축방향 흔들림 그리고 조립재현성을 확인하였다.

• Tribology and Lubricants
• /
• 제40권1호
• /
• pp.8-16
• /
• 2024

This study conducts numerical modeling and eigen-analysis of a rod-fastened rotor, which is mainly used in aircraft gas turbine engines in which multiple disks are in contact through curvic coupling. Nayak's theory is adopted to calculate surface parameters measured from the tooth profile of the curvic coupling gear. Surface parameters are important design parameters for predicting the stiffness between contact surfaces. Based on the calculated surface parameters, elastoplastic contact analysis is performed according to the interference between two surfaces based on the Greenwood-Williamson model. The equivalent bending stiffness is predicted based on the shape and elastoplastic contact stiffness of the curvic coupling. An equation of motion of the rod-fastened rotor, including the bending stiffness of the curvic coupling, is developed. Methods for applying the bending stiffness of a curvic coupling to the equation of motion and for modeling the equation of motion of a rotor that includes both inner and outer rotors are introduced. Rotordynamic analysis is performed through one-dimensional finite element analysis, and each element is modeled based on Timoshenko beam theory. Changes in bending stiffness and the resultant critical speed change in accordance with the rod fastening force are predicted, and the corresponding mode shapes are analyzed.