| 摘要 |
PURPOSE:To control the cutting of pipe by means of a metal saw by carrying out feedback control on the number of revolutions of a spindle depending on variation in cutting resistance. CONSTITUTION:Depending on the cutting resistance that varies during machining, the number of revolutions of a spindle motor 9, i.e., the number of revolution of a pipe P can be variably controlled to the optimum value corresponding to the cutting resistance. Therefore, the relationship between the cutting resistance (the amount of metal saw 21 feed) and the number of revolution of the pipe can be always maintained at a certain optimum value regardless of the diameter, material, thickness, etc. of the pipe P. When the teeth of a metal saw 21 are worn off, a machine is prevented from being overloaded since the number of revolutions of the spindle motor 9 is automatically reduced because of increase in the cutting resistance. |
