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With the development of the tool machine industry, the precision and quality demand for processing is more exquis-ite, from the traditional industrial manufacturing equipment in the past, to the current development of high-speed, high-pre-cision, high-efficiency intelligent automation tool machine equi-pment, in the face of today's globalization,customerization andenvironmental awareness trend. Taking the vertical milling machine as an example, the feed system drives the machining in the direction of the tool machining to complete the cutting process.The rail c-ontact surfac-e of the feed system is grinding. It produces noise, bad vibration, processing rigidity is reduced, processing accuracy is reduced, friction almost thermal energy is generated, etc. Finally it reduces the service life of the servo motor. In this study, the contact between the slide rail and the slide seat was obtained by using the homemade device to obtain the influence of the contact area of the rail on the thickness of the lubricant. When the same contact area, the oil film thickness of the lower oil injection amount is small. The thickness of the oil film with higher oil injection amount is thicker. When the same oil injection volume, the thickness of the oil film of the larger contact area is small.

The Influence of Contact Area on Oil Film Thickness