Internal-Oil-Feed-type High-Speed Spindle Mechanism to Prevent Cutting Oil Flow

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Abstract
The use of cutting oil is essential during the machining of precision parts by grinding for improving the quality of the machined surface and for cooling tools used. To this end, an internal-oil-feed-type high-speed spindle, which obtains rotational power using cutting oil, is widely employed. However, repeatedly used cutting oil contains small metal fragments, which reduces the bearing durability inside the spindle. This study investigated a new mechanism to improve the bearing life of internal-oil-feed-type high-speed spindles. Two designs were considered: The first uses a magnetic coupling principle to deliver power in a contactless manner, the second is a multiple bearing module structure that mitigates the limitation of contact-rubber-seal-type bearings. Furthermore, we analyzed the features and limitations of the proposed mechanism by fabricating actual models with the two designs.
Funding Information
  • Ministry of Trade, Industry and Energy
  • Korea Institute for Advancement of Technology (P0002092)

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