Zhe-Zhu Xu

Gyeongsang National University

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Co-Authors

Sung-Ki Lyu

Gyeongsang National University

Hong Xiao

Northwestern Polytechnical University

Dongyang Li

University of Alberta

Lae-Sung Kim

Gyeongsang National University

Qi Zhang

Changchun University of Technology

L. J. Liang

Qingdao Agricultural University

Xiaojing Liu

Qingdao University of Science and Technology

Chong-Hun Choi

Jai-Hwa Kang

Gyeongsang National University

Jing Zhang

Inner Mongolia University of Science and Technology

Cooperative Institutions

Gyeongsang National University

Seoul National University

Pusan National University

Korea Gas Corporation (South Korea)

Northwestern Polytechnical University

Samsung (South Korea)

Chongqing University

Shanghai Jiao Tong University

Chongqing University of Posts and Telecommunications

Xi'an Jiaotong University

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Study on the Total Design of a Conical Involute Gear

Journal of the Korean Society of Manufacturing Process Engineers (2014)

Jun-Seong Kim Do-Young Lee Jai-Hwa Kang Zhe-Zhu Xu Sung-Ki Lyu

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.

Bevel gear

Hobbing

Involute gear

Cycloid gear

Non-circular gear

10.14775/ksmpe.2014.13.2.100

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Citations (2)

A Study on Effect of Various Cooling Methods in Motion of High-Precision Ball Screw

Journal of the Korean Society for Precision Engineering (2013)

Su-Sang Kim Zhe-Zhu Xu Hyun-Koo Kim Sung-Ki Lyu

Ball screw system is widely used as a precision mechanical linear actuator that translates rotational motion to linear motion for its high efficiency, great stiffness and long life. Recently, according to the requirements of high accuracy and stiffness, the pre-load on the ball screw which means of remove the backlash in the ball screw is usually used. Because of the preload which means the frictional resistance between the screw and nut, becomes a dominating heat source and it generates thermal deformation of ball screw which is the reason for low accuracy of the positioning decision. There are several methods to solve the problem that includes temperature control, thermal stable design and error compensation. In the past years, researchers focused on the error compensation technique for its ability to correct ball screw error effectively rather than the capabilities of careful machine design and manufacturing. Significant amounts of researches have been done to realtime error compensation. But in this paper, we developed a series of cooling methods to get thermal equilibrium in the ball screw system. So we find the optimum cooling type for improving positioning error which caused by thermal deformation in the ball screw system.

Ball screw

Ball (mathematics)

Machine tool

Linear motion

10.7736/kspe.2013.30.3.254

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Citations (2)

Study on Optimization of Temperature Jump-Bending Process for Reducing Thickness Attenuation of Large-Diameter Steel Pipe

Journal of the Korean Society of Manufacturing Process Engineers (2015)

Zhe-Zhu Xu Lae-Sung Kim Jeonghwan Jeon L. J. Liang Hyo-Gyu Choi

Induction bending is a method that allows the bending of any material that conducts electricity. This technology applies a bending force to a material that has been locally heated by an eddy current induced by a fluctuating electromagnetic field. Induction bending uses an inductor to locally heat steel through induction. This results in a narrow heat band in the shape to be bent. In general, the reduction of thickness attenuation of a large-diameter steel pipe is not allowed to exceed 12.5%. In this paper, in order to meet the standard of thickness attenuation reduction, a non-uniform heating temperature jump-bending process was investigated. As a result, the developed bending technique meets the requirements of thickness attenuation reduction for large-diameter steel pipes.

Induction Heating

10.14775/ksmpe.2015.14.4.021

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Citations (0)

The evaluation of contact fatigue strength for 20MnCr5 carburized gear

International Journal of Precision Engineering and Manufacturing (2014)

Qi Zhang Jing Zhang Changhong Wu Zhe-Zhu Xu Sung-Ki Lyu

Spall

Pinion

Contact Mechanics

Fatigue limit

Gear tooth

10.1007/s12541-013-0313-6

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Citations (17)

Numerical study of shock/vortex interaction in diatomic gas flows

International Journal of Precision Engineering and Manufacturing (2016)

Hong Xiao Ke Tang Zhe-Zhu Xu Dongyang Li Sung-Ki Lyu

Diatomic molecule

Enstrophy

10.1007/s12541-016-0004-1

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Citations (3)

A Study on 3D Modeling & Stress Analysis of Helical Conical Involute Gear

Journal of the Korean Society of Manufacturing Process Engineers (2014)

Jai-Hwa Kang Doyoung Lee Jun‐Sung Kim Zhe-Zhu Xu Sung-Ki Lyu

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.

Involute gear

Cycloid gear

Non-circular gear

10.14775/ksmpe.2014.13.1.045

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Citations (2)

A Study on Tooth Micro-geometry Optimization of Planetary Gear for 5MW Wind Turbine Pitch Drive

Journal of the Korean Society of Manufacturing Process Engineers (2014)

In-Bum Lee Dongyoung Kim Zhe-Zhu Xu Do-Young Lee Sung-Ki Lyu

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.

Roundness (object)

Machine tool

Hobbing

Ball (mathematics)

10.14775/ksmpe.2014.13.1.085

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Citations (1)

Study on positioning accuracy of nut/shaft air cooling ball screw for high-precision feed drive

International Journal of Precision Engineering and Manufacturing (2014)

Zhe-Zhu Xu Xiaojing Liu Sung-Ki Lyu

Ball screw

Ball (mathematics)