Hangzhou, China
Hangzhou, China

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Deng S.,Hubei University of Automotive Technology | Deng S.,Zhejiang Tianma Bearing Co. | Hua L.,Hubei University of Automotive Technology | Shi D.,Zhejiang Tianma Bearing Co.
Materials Science and Technology (United Kingdom) | Year: 2016

Bearing ring blanks of the high-speed rail bearings, machine tool spindle bearings and wind power bearings have been manufactured through the ring rolling technology. Yet, the microstructure evolution of bearing ring in cold ring rolling remains unclear. In this work, the plastic strain distribution of the rolled ring is first simulated. Then, the microstructure of bearing ring is studied by the electron backscatter diffraction technique. Furthermore, the microstructure changes in cold ring rolling are investigated through band contrast images, and the texture evolutions after various deformation ratios are analysed by the technique of 3D-Euler space distribution. This work provides valuable guidelines for enhanced understanding the role of the cold ring rolling technology on the microstructure evolution of bearing rings. © 2016 Institute of Materials, Minerals and Mining


Song X.,East China University of Science and Technology | Cui L.,East China University of Science and Technology | Cui L.,Zhejiang Tianma Bearing Co. | Zheng J.,East China University of Science and Technology
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2013

Considering backlash, radial clearance of bearing and unbalance force, the mass, stiffness and damping matrixes of a rotor system were obtained by using finite element method, then they were assembled by an integrated method. Nonlinear dynamics model of a flexible rotor bearing system with helical-gear was established. Runge-Kutta method was used to solve nonlinear dynamics equations, and the dynamic behaviors of the system were analyzed. The nonlinear dynamics behaviors of the flexible rotor bearing system with helical-gear were discussed for effect of speed, shaft stiffness and unbalance. The results show that periodic, quasi-periodic and chaos motion occur as the speed changes. With the decrease of shaft stiffness, the range of chaos motion is decreased and the amplitude is also changed. As the unbalance increases, the range of chaos motion state is increased and range of the chaotic motion is changed.


Kang J.,China Jiliang University | Dong X.,China Jiliang University | Zhao C.,China Jiliang University | Zhao Y.,Zhejiang Tianma Bearing Co.
2011 Symposium on Photonics and Optoelectronics, SOPO 2011 | Year: 2011

A Sagnac loop sensor with a long-period grating (LPG) inscribed in polarization maintains fiber (PMF) for refractive index (RI) and temperature measurement is proposed. Taking using of the different responses of the LPG and the Sagnac loop to RI and temperature, simultaneous measurement can be achieved by monitoring the wavelength shifts and the intensity changes of the resonance peaks. One of the transmission minimum of the Sagnac loop sensor was measured, whose wavelength varied with temperature and the intensity changed with refractive index. The experiments show that sensitivity of RI and temperature are 49.9 dB/RIU and -0.65 nm/°C, respectively. The sensor system shows advantages of high sensitivity, small size and low cost. © 2011 IEEE.


Qian D.-S.,Wuhan University of Technology | Qian D.-S.,Huazhong University of Science and Technology | Qian D.-S.,Zhejiang Tianma Bearing Co. | Shi D.-F.,Zhejiang Tianma Bearing Co. | And 2 more authors.
Suxing Gongcheng Xuebao/Journal of Plasticity Engineering | Year: 2013

Wind power bearing is the key part of wind power devices. As the crucial component of bearing, the bearing ring plays a decisive role in the life and the reliability of the devices. Radial axial ring rolling is an advanced rotary plastic forming technology for manufacturing large seamless bearing rings, slewing bearings and flange rings. Currently, the bearing ring raceways of many typical ball bearings used in wind power devices are processed by cutting, which has large material consumption and low productivity. Moreover, the poor distribution of metal flow line weakens the mechanical properties. Focusing on the typical large double-raceway wind power bearing ring, this paper carried out a numerical and experimental study on raceway rolling. The design methods of the main forming parameters were proposed through theoretical analysis of ring rolling at first. Then a coupled thermal-mechanical finite element model for radial-axial rolling of bearing ring was established, and the feeding procedure of the rolling process was optimized by simulation analysis. Finally, the rolling experiment was performed and the qualified bearing ring was successfully rolled based on the simulation result. The research in this paper achieved the direct forming of raceway of large wind power bearing ring by rolling, which could provide an effective technological and theoretical instruction for processing the large bearing rings and slewing bearings in wind power and other fields with savings of material and energy.


Cui L.,East China University of Science and Technology | Shi D.F.,Zhejiang Tianma Bearing Co. | Zheng J.R.,East China University of Science and Technology | Song X.G.,East China University of Science and Technology
Advanced Materials Research | Year: 2014

Considering backlash, radial clearance of bearing and time-varying mesh stiffness, nonlinear dynamic model of gear bearing rotor system is established considering unbalance and loosening fault. Nonlinear dynamic equations are solved using Runge-Kutta method and Newton-Raphson method. Numerical simulations of the dynamic equations and the affection of the depth of crack and length of wear to the nonlinear dynamic behavior are studied. The results shows that tooth off, bilateral impact phenomenon are occurred, with increasing gear failure when unbalance occurs, and the gear system exhibits a diverse range of periodic, quasi-periodic and chaotic motion. When loosening fault occurs, the range of chaos motion is increased, and gear burnishing is also intensified. © (2014) Trans Tech Publications, Switzerland.


Kang J.,China Jiliang University | Kang J.,University of Shanghai for Science and Technology | Dong X.,China Jiliang University | Zhao C.,China Jiliang University | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

A Sagnac loop sensor with a long-period grating (LPG) inscribed in polarization maintains fiber (PMF) for simultaneous strain and temperature measurement is proposed. Taking using of the different responses of the LPG and the Sagnac loop to strain and temperature, simultaneous measurement can be achieved by monitoring the wavelength shifts and the intensity changes of resonance peaks. The experiments show that sensitivity of strain and temperature are 6.4×10 -3 dB/με and 0.65 nm/°C, respectively. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).


Zhou G.,Wuhan University of Technology | Hua L.,Wuhan University of Technology | Qian D.,Wuhan University of Technology | Qian D.,Zhejiang Tianma Bearing Co. | And 2 more authors.
International Journal of Mechanical Sciences | Year: 2012

Radial-axial ring rolling (RARR) is an advanced plastic forming technique which is widely used to manufacture large-scale seamless rings. Compared with pure radial ring rolling, a pair of axial rolls are added to control the axial deformation of the ring during the RARR process. The motions of the axial rolls are very important to the RARR process since they have enormous influence on the stability of the process as well as the quality of the rolled ring. But during the RARR process, the motions of the axial rolls are very complicated, and how to reasonable control them always is a difficulty in the actual RARR production which limits the development and application of the RARR. In this paper, the ranges of motion parameters of the axial rolls are reasonable determined firstly, then a 3D elastic-plastic and coupled thermo-mechanical FE model of RARR is explored using the dynamic explicit code ABAQUS/Explicit. Based on the reliable 3D FE model, the effects of the axial rolls motions on the RARR process are investigated. The research results provide valuable guidelines for the motion control of the axial rolls in the actual RARR production. © 2012 Elsevier Ltd. All rights reserved.


Cui L.,East China University of Science and Technology | Cui L.,Zhejiang Tianma Bearing Co. | Shi D.,Zhejiang Tianma Bearing Co. | Zheng J.,East China University of Science and Technology | Song X.,East China University of Science and Technology
Applied Mechanics and Materials | Year: 2013

Coupling faults diagnose methods of gear rotor system are studied. Moment invariants are extracted from axis orbit of rotor system, which used to identify imbalances, loosening faults. Mode functions with different characteristic time scales are obtained based on the EMD method. Marginal spectrum is obtained by Hilbert transform, which can used to identify the wear faults of gear system. Moment invariant and BP neural network are used to identify the unbalanced fault and loosening faults. Hilbert transform method is used to diagnose gear wear fault. Experiments prove the effective of the methods. © (2013) Trans Tech Publications, Switzerland.


Qian D.S.,Wuhan University of Technology | Qian D.S.,Zhejiang Tianma Bearing Co. | Zhou G.,Wuhan University of Technology | Hua L.,Wuhan University of Technology | And 2 more authors.
Ironmaking and Steelmaking | Year: 2013

Radial-axial ring rolling, which is widely used to manufacture large scale seamless rings, is an advanced but complicated plastic forming technique with multiprocess factors coupling with interactive effects. During the radial-axial ring rolling process, the blank size is a decisive parameter because it influences directly the degree of deformation of the ring and the rolling parameters of the process. In this paper, the blank size design method of the radial-axial ring rolling process is first proposed, then a valid three-dimensional (3D) coupled thermomechanical FE model of the process is explored under ABAQUS software environment. Based on the valid 3D FE model, the blank size effects on radial-axial ring rolling are investigated. The research results provide valuable guidelines for blank size design and optimisation in the actual radial-axial ring rolling production. © 2013 Institute of Materials, Minerals and Mining.

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