Development of wheel spindle for ultra-high speed surface grinding machine - Studies on ultra-high speed grinding (1st report)

Yutaka Inada, Katsuo Syoji, Tsunemoto Kuriyagawa, Kunihiko Un'no

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

This paper describes the development of a high-frequency wheel spindle for an ultra-high speed surface grinding machine. This project aims to achieve a high efficiency grinding of steel with cBN wheels, in which a stock removal rate is over 300 mm3/(mm·s) at a wheel peripheral speed of 400m/s. At such a speed, the power loss caused by air and coolant friction is larger than grinding power. At first, a theoretical analysis of grinding forces was carried out to estimate the grinding power. From this analysis the wheel diameter of φ250mm and motor power of 22kW at 30000min-1 were decided. Also, an eigenvalue analysis by FEM was carried out to decide the diameter of the spindle shaft that avoids the resonance caused by a heavy wheel. In the spindle unit, a newly developed lubrication method called the "retainer lubrication" was adopted to achieve dn value of 195 × 104. The retainer lubrication reduces the no-load power and the temperature rise of bearings. Furthermore, constant pre-load mechanism was adopted to achieve a high stiffness without burning out the bearings. Finally, the advantage of a small diameter wheel is confirmed experimentally by measurement of air friction loss, which conformed to calculated results using the logarithmic law.

Original languageEnglish
Pages (from-to)569-573
Number of pages5
JournalSeimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering
Volume62
Issue number4
DOIs
Publication statusPublished - 1996 Jan 1
Externally publishedYes

Keywords

  • Air friction loss
  • Constant pressure preload mechanism
  • Eigenvalue analysis
  • High efficiency grinding
  • High-frequency wheel spindle
  • Retainer lubrication
  • Ultra-high speed grinding

ASJC Scopus subject areas

  • Mechanical Engineering

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