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Design Guidelines for High Speed CNC Machine Tool Spindle Bearings


Affiliations
1 Department of Mechanical Engineering, Institute of Aeronautical Engineering, Hyderabad, India
2 Bharat Heavy Electricals Limited- Corporate R&D Division, Hyderabad, India
     

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The manufacturing industries are facing challenges of designing high speed CNC machine tools to meet the demands of machining modern materials for different applications with wide range of higher spindle speeds. The spindle and bearing elements in headstock unit are subjected to structural loads which include cutting force, tool clamping force and bearing preload, thus producing reaction forces on the bearings during machining process. At higher speeds, large amount of heat is generated due to applied torque because of cutting load on bearings and viscous friction in the spindle bearing zone. This causes structural deformations in the bearing with the effect of thermal loads. The structural and thermal loads are calculated using appropriate theories for applying inputs during analysis. In the present study, an integrated thermo-structural couple field for super precision angular contact ball bearings, B7009ETP4S & HCB7009ETP4S in tandem arrangement is modelled, and design of experiments is simulated with varying boundary conditions in ANSYS Workbench to determine deformation, stresses and temperature variation induced in bearing elements. The temperature variation is also validated in numerical simulation using finite difference method, resistance network and experimental setup. The simulation results are in good agreement with experimental outputs and are within 10% variation, for reliable bearing performance. This approach has provided guidelines for system design to establish accurate prediction of bearing heat transfer and selection method.

Keywords

High Speed Spindle, Tandem Arrangement of Angular Contact Bearings, Thermo- Structural Integration, Design of Experiments, Finite Difference Method, Thermal Image.
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  • Zhenhuan Ye1, Liqin Wang2, Guanci Chen3 and Di Tang1: Analysis of thermo-mechanical coupling of high-speed angular-contact ball bearings, Advances in Mechanical Engineering 2017,Vol.9(6)114_TheAuthor(s)2017DOI: 1 0 . 1 1 7 7 / 1 6 8 7 8 1 4 0 1 7 7 0 2 8 1 2 j o u r n a l s . sagepub.com/home/ade

  • R. Sathiya Moorthy, V. Prabhu Raja: An Improved Analytical Model for Prediction of Heat Generation in Angular Contact Ball Bearing, Arab J Sci Eng (2014) 39:8111–8119, DOI 10.1007/s13369-014-1351-9.

  • Yanfang Dong1,2, Zude Zhou1,2 and Mingyao Liu: A general thermal model of machine tool spindle.

  • O. Kilicay: Determination of bearing deflections The Machine Tool Industry Research Association, Macclesfield, Cheshire , IMechE December 19x3 0263-71 54/83/197C-O277 $02.00 Proc Instn Mech Engra Vol 197.

  • Mohammad Faraji Ghanati ,Reza Madoliat: Theoretical and experimental studies of spindle ballbearing nonlinear stiffness, Akademeia (2013) 3(1): ea0117Applied Sciences.

  • WANG Yan-shuang1, LIU Zhe, ZHU Hai-feng: Heat generation of bearing.

  • Balamurugan.N, C.Bhagyanathan: Analysis and Investigation on Thermal Behaviours of Ball Bearing in High Speed Spindle International Journal of Innovative Science and Modern Engineering (IJISME) ISSN: 2319-6386, Volume-2, Issue-4, March 2014.

  • Viorel Paleu: High-Speed Hybrid Angular Contact Ball Bearings Lubricated by Kerosene Mist, The Annals of University “dunărea de jos“ of galaţi fascicle viii, 2008 (xiv), issn 1221-4590 tribology

  • S. Bharath Subramaniam*, R. V. M. Deva Harsha, M. Vivek, V. V. V. Durga Prasad

  • Thermal Analysis of Ceramic Conventional Ball Bearings, Indian Journal of Science and Technology, Vol 9(35), DOI: 10.17485/ijst/2016/v9i35/94529, September 2016

  • Xiaoping Li1, 2, a *, Yujun Xue1, 2, b, Yongjian Yu1, 2, c, Donghong Si1, 2, d and Dongliang Li 2, e Analysis forThermal Characteristics of High-Speed Angular Contact Ball Bearingunder Different Preload 8th International Conference on Social Network, Communication and Education (SNCE 2018) Advances in Computer Science Research, volume 83.

  • Anurag V. Karande, Static Analysis of VMC Spindle for Maximum Cutting ForceIJSRD- International Journal for Scientific Research & Development| Vol. 4, Issue 05,2016 | ISSN (online): 2321-0613.

  • R. Nathan Kartz James g.hanoosh, cearamics for high performance rolling elements: a review and assessment,army materials and mechanics research centre

  • Pradeep K. Gupta, thermal interactions in rolling bearing dynamics, AFRL-PR-WP-TR-2002-2042

  • M. Chandra Sekhar Reddy ,Thermal stress analysis of a ball bearing by finite element method, International Journal of Advanced Research in Engineering and Technology (IJARET) Volume 6, Issue 11, Nov 2015, pp. 80-90, Article ID: IJARET_06_11_008.

  • K. Tanimoto, K. Rajihara, K. Yanai- Koyo engineering journal ED NO 157E 2000.

  • Hirotoshi Aramaki,Yoshio Shoda,Yuka Morishita, Takeshi Sawamoto The Performance of Ball Bearings With Silicon Nitride Ceramic Ballsin High Speed Spindles forMachine Tools Research Center,Nippon Seiko K.K.(NSK),Fujisawa, Kanagawa, Japan.

  • PETE CENT0 and DON W. DAREING, Ceramic Materials in Hybrid Ball bearing, Tribology Transactions, 42:4, 707-714, DOI:10.1080/10402009908982273.

  • Li Wu 1 and Qingchang Tan 1,* Thermal Characteristic Analysis and Experimental Study of a Spindle-Bearing System Entropy 2016, 18, 271; doi:10.3390/e18070271.

  • 1 School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang China

  • HaitongWang, Yonglin Cai, and Heng Wang, A dynamic thermal-mechanical model of thespindle-bearing system,Mech. Sci., 8, 277–288, 2017https://doi.org/10.5194/ms-8-277- 2017

  • VVSH Prasad, Dr.V.Kamala , High speed machine tool spindle cooling by air throttling – A feasibility study, International Journal of Research in Advent Technology, Vol.6, No.7, July 2018 E- ISSN: 2321-9637.

  • VVSH Prasad and Dr.V.Kamala , Thermo-Mechanical Modeling And Analysis Of High Speed Spindle, International Journal of Advanced Scientific Research and Management, Volume 3 Issue 9, Sept 2018, ISSN 2455-6378

  • MACHINE TOOL DESIGN HAND BOOK CMTI MCGRAWHILL2015.

  • FAG –Super precision bearing-AC-41 130/7 EA April 2oo8 Page 42,43 and FAG Aero space and super precision bearing division,publ.no.AC 41130/3EA June 1998


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  • Design Guidelines for High Speed CNC Machine Tool Spindle Bearings

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Authors

V. V. S. H. Prasad
Department of Mechanical Engineering, Institute of Aeronautical Engineering, Hyderabad, India
Kamala
Bharat Heavy Electricals Limited- Corporate R&D Division, Hyderabad, India

Abstract


The manufacturing industries are facing challenges of designing high speed CNC machine tools to meet the demands of machining modern materials for different applications with wide range of higher spindle speeds. The spindle and bearing elements in headstock unit are subjected to structural loads which include cutting force, tool clamping force and bearing preload, thus producing reaction forces on the bearings during machining process. At higher speeds, large amount of heat is generated due to applied torque because of cutting load on bearings and viscous friction in the spindle bearing zone. This causes structural deformations in the bearing with the effect of thermal loads. The structural and thermal loads are calculated using appropriate theories for applying inputs during analysis. In the present study, an integrated thermo-structural couple field for super precision angular contact ball bearings, B7009ETP4S & HCB7009ETP4S in tandem arrangement is modelled, and design of experiments is simulated with varying boundary conditions in ANSYS Workbench to determine deformation, stresses and temperature variation induced in bearing elements. The temperature variation is also validated in numerical simulation using finite difference method, resistance network and experimental setup. The simulation results are in good agreement with experimental outputs and are within 10% variation, for reliable bearing performance. This approach has provided guidelines for system design to establish accurate prediction of bearing heat transfer and selection method.

Keywords


High Speed Spindle, Tandem Arrangement of Angular Contact Bearings, Thermo- Structural Integration, Design of Experiments, Finite Difference Method, Thermal Image.

References