Thermal characteristics analysis and error prediction for lubricated multi-link high-speed precision presses

Abstract

Thermal models are important in the process of predicting the thermal characteristics and corresponding thermal error of multi-link high-speed precision presses (MLHSPPs) with an oil-lubrication system. Previous models only involved the effects of bearing stiffness, temperature change of bearings, flexibility of crank shaft on the heat generation power, while the influences of revolute clearance joint and flexibility of linkage are seldom considered, which inevitably reduces the accuracy of thermal analysis. To overcome this problem, dynamic models of flexible multi-link mechanisms (MLM) with clearance, lubrication, crankshaft-bearing system are constructed, the interaction forces between pin and bushing are obtained to calculate its heat generation power. Then, an improved model of MLHSPP with lubrication is proposed to analyze the temperature evolution and the thermal error between slider and work table at the position of LDP, by considering bearing stiffness, temperature change of bearings, flexibility of crank shaft, linkage, clearance, lubrication and thermal contact resistance all together. Compared with results from traditional models, the simulation data from this improved thermal model agree well with experiment, which proves the validity of the proposed model. Furthermore, the temperature rise and the thermal error of MLHSPP between slider and work table at the position of LDP under different input speeds, lubricating oil flux and contact angles of ball bearing were also studied.

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Acknowledgments

This work was supported by the following research projects: “The Fundamental Research Funds for the Central Universities”, Grant # KYTZ201603, “Innovation Fund of Science and Technology for Outstanding Youth from College of Engineering, Nanjing Agricultural University” Grant # YQ201606, and “Qing Lan Project of Jiangsu Province”, Grant # 80400103.

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Correspondence to Enlai Zheng.

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Recommended by Associate Editor Hyeong-Joon Ahn

Enlai Zheng received his B.S and Ph.D. in mechanical engineering from Nanjing Institute of Technology and Southeast University in 2008 and 2013. He is currently an Associate Professor of mechanical engineering at Nanjing Agricultural University. His research field is mainly focused on dynamic design and control of machine.

Yuanzhao Yang received his B.S. in mechanical engineering and automation, Nanjing Agricultural University in 2018. He is currently a postgraduate student and pursuing the M.S. in mechanical engineering from Nanjing Agricultural University. His research interest is thermal error modelling, analysis and compensation of machine.

Zhaohui Peng received his B.S. in material forming and control engineering from the College of Engineering, Nanjing Agricultural University in 2017. He is currently a postgraduate student pursuing the M.S. in mechanical engineering from Nanjing Agricultural University. His research interest is thermal error modelling, analysis and compensation of machine.

Yue Zhu received his B.S. and M.S. in mechanical engineering from Jiangsu University of Science and Technology, and Southwest University of Science and Technology in 1998 and 2007. He received his Ph.D. degree in mechanical engineering from Nanjing University of Aeronautics & Astronautics in 2011. He is currently a lecturer in mechanical engineering at Nanjing Agricultural University. His research interest is focused on model updating and validation, and vibration control.

Xiao Zhao received his B.S and Ph.D. in materials science and engineering from Huazhong University of Science and Technology in 2011 and 2016. He is currently a research fellow in the Faculty of Engineering and the Environment in University of Southampton. His research interest is focused on thermal error modelling and compensation of mechanical system.

Xiangze Lin received his B.S. and M.S. from Southeast University in 2000 and 2006. He received his Ph.D. from Nanjing University of Science and Technology in 2012. He is currently an Associate Professor in the College of Engineering, Nanjing Agricultural University. His main research interests include design and control of machine.

Min Kang received his B.S. and M.S. in mechanical engineering from North-eastern University and Xi’an Jiaotong University in 1986 and 1989. He received his Ph.D. in mechanical engineering from Nanjing University of Aeronautics and Astronautics in 2003. He is currently a Professor in the College of Engineering in Nanjing Agricultural University. His research interest is focused on design and control of machining technology and machine.

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Zheng, E., Yang, Y., Peng, Z. et al. Thermal characteristics analysis and error prediction for lubricated multi-link high-speed precision presses. J Mech Sci Technol 33, 2537–2559 (2019). https://doi.org/10.1007/s12206-019-0503-y

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Keywords

  • Oil lubrication
  • Angular contact ball bearing
  • Absolute nodal coordinate formulation
  • Finite element method
  • Multi-link mechanism
  • Flexibility