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Qiang H.,Anyang Institute of Technology | Qiang H.,Luoyang Bearing Research Institute | Qiang H.,Tsinghua University | Yong Z.,Anyang Institute of Technology | And 3 more authors.
Recent Patents on Mechanical Engineering | Year: 2012

High speed machining (HSM) is a promising technology for drastically increasing productivity and reducing production costs. Development of high speed spindle technology is strategically critical for researchers to implement HSM. High speed spindles are notorious for their sudden catastrophic failures without alarming signs at high speed due to thermal problems. This paper reviews various patents on thermal characteristics and water-cooling system of high speed motorized spindle and, based on the calculation theory of heat conduction, the finite element software was applied in the simulation and analysis of high speed spindle system aimed at dealing with difficulties in calculating the amount of cooling water and measuring the temperature distribution of helical water-cooling system of the high speed spindle. A finite element thermal model is developed to characterize the heat distribution of a high speed motorized spindle, in particular the characterization of helical water-cooling system. The simulation result, experimental validation and sensitivity analysis show that temperature increase could be significantly reduced with the application of helical water cooling system. Based on the simulation analysis, we can predict the temperature distribution and development of helical water-cooling system when the motorized spindle endures various ambient temperatures and reduces the trial modification times of the water-cooling system design to achieve high efficiency and lower manufacturing cost. © 2012 Bentham Science Publishers.

He Q.,Anyang Institute of Technology | Li A.L.,Anyang Institute of Technology | Yong Z.,Anyang Institute of Technology | Ye J.,Luoyang Bearing Research Institute | Li X.S.,Anyang Institute of Technology
Advanced Materials Research | Year: 2013

By taking the belt spindle of the machining center high speed and high precision as the research object, using the finite element method, the Solidworks software is used to make the thermal analysis. In this paper, we define the boundary conditions and thermal load of the spindle thermal analysis, and establish the finite element model. The steady-state thermal analysis and temperature rise is simulated, and the temperature distribution is predicted by using Solidworks software. The results show that the structural design of the belt spindle is reasonable, and the temperature rise is in the control range. © (2013) Trans Tech Publications, Switzerland.

Yong Z.,Anyang Institute of Technology | Zhao X.,Anyang Institute of Technology | Qiang H.,Anyang Institute of Technology | Ye J.,Luoyang Bearing Research Institute | Niu Q.,Luoyang Bearing Research Institute
Advanced Materials Research | Year: 2011

Cu nanoparticles as N32 base oil additives were studied in the paper. The structure of Cu nanoparticlcs was characterized by Transmission Electron Microscopy (TEM) and X-ray powder diffraction spectroscope (XRD). The widely used steel-steel friction system was chosen to test the feasibility and practicality of Cu nanoparticles as bearing lubricant additives. The results show that N32 base oil with 0.5% Cu nanoparticle can improve the test sample contact fatigue life than pure N32 base oil. © 2011 Trans Tech Publications, Switzerland.

Wang X.,Anyang Institute of Technology | Wang X.,Luoyang Bearing Research Institute | Li Z.J.,Anyang Institute of Technology | Li Z.J.,Luoyang Bearing Research Institute | And 2 more authors.
Recent Patents on Mechanical Engineering | Year: 2012

A new constant scallop-height smooth tool-path planning algorithm is presented in this paper. The algorithm can generate smooth tool path by controlling the curvature of the tool path so as to avoid the tool path's inflexion which is often generated in traditional constant scallop height tool path planning affecting the machining surface quality. Taking a parametric surface for example, the algorithm is programmed using Matlab software and compared with the traditional one, the result shows that this algorithm can acquire the minimum curvature radius of tool-path line and improve machining quality. Especially in high speed milling, the idea of algorithm has obvious merits in practice. The paper ends with some recent patents and further developments in the fields. A method for calculating depth of cut without any milling selfexcited vibration, a system produces orthodontic aligners by CNC machining and etc. © 2012 Bentham Science Publishers.

Li Z.J.,Anyang Institute of Technology | Wang X.,Anyang Institute of Technology | Ye J.,Luoyang Bearing Research Institute
Recent Patents on Mechanical Engineering | Year: 2012

Composite electroforming is a special processing technology. At the beginning of the paper, some recent patents related to it are discussed simply. The electroforming technology is used in the device, for making a micro metal nickel mold and disclosed a Cu-W-Ni copper matrix composite. It can be used for forming coating or free standing deposit of nanocrystalline metal, metal alloys or metal matrix composite. What's more, in this paper, the study of fundamental research on rare earths binary nanocomposite electroforming technology was carried out, using rare earth's nanoparticles and ceramic nanoparticles as suspended particles in electroforming bath. The effects of process parameters on the nanoparticles content in deposits were investigated. By analyzing and testing surface morphology, microstructure and properties of the electroforming deposits, the optimum process of preparing the electroforming deposit was obtained. Furthermore, the mechanism model of two kinds of nanoparticles or more codeposited with metal was put forward. Moreover, the effect of two kinds of nanoparticles on the properties of electroforming deposits was analyzed. The conclusions are presented as follows: the nanocomposite electroforming layer with outstanding properties could be obtained under the conditions of the lower cathode current density and appropriate nanoparticles ratio. Due to the existence of CeO 2 and ZrO 2 nanoparticles, crystal growth patterns of Ni in nanocomposite electroforming deposit change gradually to the growth of matrix metal Ni along (2 0 0) the crystal face; because of CeO2 and ZrO2 nanoparticles codeposition, the rare earths binary nanocomposite electroforming deposit has excellent properties, mainly attributed to dispersion strengthening effect and refining crystal strengthening effect of CeO2 and ZrO2 nanoparticles. © 2012 Bentham Science Publishers.

Li Z.,Tianjin University of Technology and Education | Wang J.L.,Tianjin University of Technology and Education | Ye J.,Luoyang Bearing Research Institute
Recent Patents on Mechanical Engineering | Year: 2012

Sheet metal forming plays an important role in industry nowadays. Drawing is a popular processing for the sheet mental forming. The drawing process is difficult to control because of many factors affecting the whole forming process. In order to solve the problems encountered in practice, some new methods have been invented. This paper reviews various patents of suppressing defect through adopting new structure and new device in recent years, especially the patents on the drawing die structure with floating punch by hydraulic pressure. In addition, this article introduces a method to solve the problem by applying a new structure. These new structures, which are appropriate for the characteristics of the product, adjacent to each other and the forming depth is deep. The article also introduces a method to solve this problem. The new structure has one or more floating punches with the hydraulic pressure according to the characteristics of the product. During the process of sheet mental forming, The drawing force is put on the floating punch, which makes the sheet mental flow into the cavity of the die. Meanwhile the force provided by hydraulic varies according to the curve because that different status of forming needs different forces. The floating punch has a guide post to assure the precision of up-down moving. Comparing with traditional die structure, the new structure can increase the forming depth of adjacent characteristics and reduce the number of drawing. Therefore, the method is useful and the cost can be reduced. © 2012 Bentham Science Publishers.

Chen W.,Zhejiang Sci-Tech University | He Q.,Zhejiang Sci-Tech University | He Q.,Xi'an University of Technology | Liu H.,Xi'an University of Technology | And 2 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2010

A general applicable method for simulation of the fluid state and the thermal distribution was applied based on the software of ANSYS CFX. By changing the boundary conditions in FE mode of water-cooling system, temperature-rise was analyzed and compared according to different flux for cooling water, operation conditions, ambient temperature conditions. The research indicates that when the flow model is intense turbulent-flow, the k-ε dominated equation used to solve the conjugate heat transfer equation is an effective method, the greater the flux of cooling water and the smaller the temperature-rise; when the cooling water velocity increases to a critical value, the temperature rise is unable to be effectively controlled by increasing the flux of cooling water, the ambient temperature has little influence on temperature rise.

He Q.,Xi'an University of Technology | Liu H.-Z.,Xi'an University of Technology | Ye J.,Luoyang Bearing Research Institute
Mocaxue Xuebao/Tribology | Year: 2010

Based on experiments, the structure of Cu nanoparticles was characterized by transmission electronmicroscopy (TEM) and X-ray powder diffraction (XRD). The friction and wear tests of steel-steel tribo-pair lubrticated by oil with and without nano-Cu particles were counducted on a four ball tribo-tester for optimized concentration of nano-Cu particles. Comparisons on vibration, noise and temperature rise of motorized spindle were also included. The results showed that the optimized concentration of Cu nanoparticle for the best tribological performance was 0.5%. Vibration, noise and temperature rise of motorized spindle with 0.5% Cu nanoparticle N32 as additive in oil were lower than that lubricated by pure N32 oil.

Deng S.,Henan University of Science and Technology | Cai W.,Henan University of Science and Technology | Xu Q.,Henan University of Science and Technology | Liang B.,Luoyang Bearing Research Institute
ICCASM 2010 - 2010 International Conference on Computer Application and System Modeling, Proceedings | Year: 2010

Due to the high demands for productivity and quality of bearing and the shortage of traditional detection methods, this paper proposes an automatic detection system based on machine vision technique. The detection system uses digital image processing technology to process the images collected by CCD camera and finish identification for the surfaces of bearing quickly and accurately. Firstly, least squares fitting and annulus scan are used to locate the bearing and the regions which will be detected. Secondly, contrast enhancement and low-pass filtering are used to improve the quality of images. Next, object inspection is applied to determine whether defects exist. Finally, the shape feature is used to finish recognition of defects. Experiments show that the detection system has the features of high efficiency, high accuracy and ease of use. This research has a certain practical value.

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