| 摘要 |
PURPOSE:To prolong the service life of a cutter and to reduct the frequency of cutter change by setting the machining of a workpiece in such order as, for example, rough cutting of the right side of the workpiece cutter reversing rough cutting of the left side finishing of the left side cutter reversing finishing of the left side. CONSTITUTION:For example, in an inner surface machining unit suitable for cutting the inner surface of a differential gear case of a car, if a spindle 23 is retreated at a specified speed, and also a spindle 24 is advanced a little faster than the spindle 23 provided that the force to advance is less than that of retreating (In this case, the force to advance is greater than cutting load.), a cutter 11 is rotated being clamped between the spindles 23 and 24 performing rough cutting of the left side of the internal section of the workpiece. Completing the cutting to the specified position, the cutter 11 does the same motion as in the rough cutting in the opposite way performing the finish cutting of the right side of the internal section of the workpiece. Thus, the service life of a cutter can be prolonged and the frequency of cutter change can be reducted. |
