1994 年 60 巻 10 号 p. 1485-1489
This paper deals with the temperature and thermal deformation performance of the machine tool spindle with high speed and under-race lubrication. As a result of measurement on rotating test, under-race jet lubrication has succeeded in rotating at a 20000 min-1 (dmn=2.5×106) and achieved a high precision on a small thermal deformation by oil cooling of the spindle inside, and also achieved a smaller power loss than usual oil-jet lubrication, because the amount of lubricant used was much less than that of usual oil-jet lubrication system to get the same speed. In the same way under-race oil-air lubrication achieved a higher rotational speed than usual oil-air lubrication, and also achieved a further high rotational speed by using ceramic ball bearings. Analysis of preload increment showed that oil cooling of the spindle inside is better than the use of ceramic ball bearings in terms of preload restraining effect.