| 摘要 |
PURPOSE:To permit the reasonable grinding work without making the machine complicated, by supplying air into an air grinder incorporated into a machining center from the contiguous outside part installed onto the machine and controlling the feed speed by detection the overload. CONSTITUTION:In use of an air grinder 1, an air feeding joint piece 30 and an air feeding pipe are installed onto a transverse-shaft type machining center, etc., and the air grinder 1 is installed onto a spindle 42. When the number of revolution reduces because of the load applied onto an abrasive wheel 17, the detected value of the number of revolution by an electromagnetic sensor in the grinder 1 is input into a tachometer and compared with a set number of revolution by a comparator. When each value is over the set value in each comparator starting from the first comparator in succession, the work is continued by the first feed, and when the value is less than the set value, the drive controlling part of a feed mechanism is operated within the range up to the detection of overload in the next stage, and the feed speed of a table is reduced, and thus the reasonable grinding work can be executed efficiently during the work by the machining center. Further, the necessity of making the spindle part of the machine complicated eliminated. |
