Abstract

Premature failure of machine tool spindle bearings is a major problem in production that can result in enormous loss in production and spindle rehabilitation cost. The bearing internal contact force tends to change when the spindle is subjected to abnormal operating conditions. In this paper, the complicated variations in the condition of a grinding spindle in a three-shift production line were studied with a focus on examining the relative magnitudes of the main components of the race/roller contact force, e.g., the bearing initial preload, thermally induced preload, and grinding load, over an extended period of time. The results show that, a stable operating condition was achieved and that the dominant contact force component is the thermal preload. Significant preload variations were observed between shifts when the spindle was restarted. Excessive thermal preload which grew to a value of more than nine limes of the initial preload was also observed. Consequently, excessive preload is likely to be the ...

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.