Experimental and Theoretical Study on Forming Film Properties of Hollow Cylindrical Rollers

Abstract

Bending deformation of a hollow cylindrical roller (HCR) was calculated by curve bending theory and slice technology. Furthermore, an elastohydrodynamic lubrication (EHL) model involving hollow rollers was established by coupling the finite line EHL model and bending deformation. Measurements of film thickness for hollow rollers were carried out by using a line-contact optical EHL test rig, and the experimental data and theoretical results agreed well with each other. For a roller with a straight-line profile, the hollow structure could reduce pressure peak at the roller ends, but the edge effect was still present. The film thickness at the ends unfortunately could not be improved by such hollow structures, unless a profile modification for the operating surface is designed.

Keywords:

• Hollow cylindrical roller
• EHL
• film thickness
• profile modification

Acknowledgements

The authors gratefully acknowledge professor senior engineer Jiaming Gu, the general manager of Shanghai Tian Hong Bearing Co. Ltd., for processing the hollow rollers with a straight line, and Jincai Lu, the chief engineer of Zhejiang Hejin Rollers Science and Technology Co. Ltd. for processing the logarithm profile of the hollow rollers.

Disclosure statement

There are no conflicts of interest.

Additional information

Funding

This work was carried out with financial support from China’s national twelfth five-year project for science and technology under contract D.50-0109-12-001.