| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a machine tool which can perform an appropriate warm-up operation for a spindle condition, does not uselessly increase a warm-up operation time before machining, and does not damage bearings due to the warm-up operation. <P>SOLUTION: A control part 7 stores a supply amount of the lubricant into bearings 4, 4, , and the rotational speed of the spindle 2 in a memory part 22 as the time-series data. When starting to rotate the spindle 2, the control part 7 calculates a residual amount of lubricant in the bearings 4, 4, , by using the time-series data stored in the memory part 22, determines whether or not the warm-up operation is required based on the residual amount of lubricant, and controls the rotational speed at the time of starting of the spindle 2 according to the determination result. Therefore, necessity of the warm-up operation can be accurately determined, the machining efficiency is not deteriorated by the useless warm-up operation before machining, and an efficient machining can be performed. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
