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Zhe Zhu Xu(허철수),Chang Choi(최창),Lae-Sung Kim(김래성),Kwon-In Baek(백권인),Sung-ki Lyu(류성기) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.2
Due to the requirement of the development of the precision manufacturing industry, the accuracy of machine tools has become a key issue in this field. A critical factor that affects the accuracy of machine tools is the feed system, which is generally driven by a ball screw. Basically, to improve the performance of the feed drive system, which will be thermally extended lengthwise by continuous usage, a thermal error compensation system that is highly dependent on the feedback temperature or positioning data is employed in the machine tool system. Due to the overdependence on measuring technology, the cost of the compensation system and low productivity level are inevitable problems in the machine tool industry. This paper presents a novel feed drive thermal error compensation system method that could compensate for thermal error without positioning or temperature feedback. Regarding this thermal error compensation system, the heat generation of components, principal of compensation, thermal model, mathematic model, and calculation method are discussed. As a result, the test data confirm the correctness of the developed feed drive thermal error compensation system very well.
Study of the Transmission Error Prediction of a Five-speed Manual Transmission System
Sang-Pil Cho(조상필),Dong-Gyu Lee(이동규),Lae-Sung Kim(김래성),Zhe-zhu Xu(허철수),Sung-ki Lyu(류성기) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.2
For the manual transmission gearbox used in the automotive industry, gear meshing transmission error is the main source of noise known as gear whine, and radiated gear whine noise plays an important role in the whole gearbox. Therefore, in order to keep competitive in the automotive market, the NVH performance of transmission gearboxes is increasingly important for automotive manufacturers when a new product is developed. In this paper, in order to achieve an optimized tooth contact pattern, gear tooth modification is applied to make up for the deformation of the teeth owing to load. A five-speed MT gearbox is firstly modeled in RomaxDesign software and the prediction of transmission error under the loaded torques is studied and compared. From the simulation, the transmission error and maximum contact stress are also simulated and compared after tooth modification of the loaded torques. Finally, the simulation results are used to optimize the whole gearbox design and the final gearbox prototype is testified to obtain NVH performance in a semi-anechoic room.
A Study on the Design of a Gear Transmission Error Test Rig
Qi Zhang(장기),Jing Zhang(장정),Hou-Ling Yan(연후링),Qing-Wang Zhu(주징왕),Zhe-zhu Xu(허철수),Sung-Ki Lyu(류성기) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.1
Transmission error (TE) is the most important cause of gear noise and vibration because TEs affect the changes of the force and the speed of gears. TE is usually expressed as an angular deviation, or a linear deviation measured at the pitch point and calculated at successive positions of the pinion as it goes through the meshing cycle. Accurate measurement of TE for gear transmission will provide a reasonable basis for gear design, manufacturing processes and quality control. Therefore, in order to study the accuracy of the gear transmission, stability, TE, vibration and noise after gear micro-geometry modification, a gear transmission test rig is proposed in this paper, which is based on the existing technical conditions, by using reasonable testing methods, hardware and a signal processing method. All of the details and the experience can be taken into consideration in the next upgraded test rig.
헬리컬 코니칼 인볼류트기어의 3D 모델링과 치면 응력해석에 관한 연구
강재화(Jai-Hwa Kang),이도영(Do-Young Lee),김준성(Jun-Sung Kim),허철수(Zhe-Zhu Xu),류성기(Sung-Ki Lyu) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.1
Generally, marine transmissions contain straight shafts and helical gears, meaning that enginerooms require more space. In order to guarantee a levelengine space forconical 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 thewidth 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 gearswere done.
Study on Bearing Life Calculation for Wind Turbine Gearbox
Long-jun Liang(양용군),Chang Choi(최창),Qi Zhang(장기),Zhe-Zhu Xu(허철수),Sung-ki Lyu(류성기) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.5
Currently, wind power has become a major research field in the area of sustainable development. As one important component of a wind turbine transmission system, most instances of downtime due to a gearbox failure are caused by bearing failures. Gearboxes for wind turbines must have the highest levels of reliability over a period of approximately 20 years, withstanding high dynamic loads. At the same time, a lightweight design and cost minimization efforts are required. These demands can only be met with a well-thought-out design, high-quality materials, a high production quality and proper maintenance. In order to design a reliable and lightweight gearbox, it is necessary to analyze methods pertaining to the bearing rating lifetimes of the standard and of different companies, also including calculation methods for modification factors. This can determine the influence of the bearing lifetime.
김준성(Jun-Seong Kim),이도영(Do-Young Lee),강재화(Jai-Hwa Kang),허철수(Zhe-Zhu Xu),류성기(Sung-Ki Lyu) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.2
Currently, there are many power transmission devices, including gears, friction wheels, chains, and belts. Because the power transmission of gears is most certain in 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 beveloid 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.
5MW 풍력용 피치드라이브의 유성기어 Micro-geometry 최적화에 관한 연구
이인범(In-Bum Lee),김동영(Dong-Young Kim),허철수(Zhe-Zhu Xu),이도영(Do-Young Lee),류성기(Sung-Ki Lyu) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.1
The rotation of a spindle unit must be accurate for high-quality machining and to improve the quality of the machine tools. Therefore, the proper measurement of the rotation accuracy and ensuring a proper analysis are very important. Separate processes are necessary because spindle errors and roundness errors associated with the test balls can both factor into the measured rotation error values. We used three methods to discern test ball errors and analyzed which could be deemed as the most proper technique in a test of the rotation accuracy of the main spindle of a machine tool.