| 摘要 |
PROBLEM TO BE SOLVED: To provide a control method of a hole opening machine, with which the buckling and the idle-hitting of a drill rod in the hole opening machine are prevented, the hole opening work is quickened, the precision of an iron tapping hole depth is improved and the remote control work can be executed by automatizing the hole opening work so as to release operators from the work in the bad surroundings. SOLUTION: This automatic control method of the hole opening machine is executed by giving the hole opening machine holding the drill rod the hitting and the rotation, and driving so as to advance/retreat the hole opening machine 1 with a hydraulically driven feed motor to open the hole. This control method comprise a step for detecting the feeding load by the detected hydraulic pressure, a step in which, in the case this detected pressure reaches the upper limit setting value of the development of the buckling, the feeding is stopped and only the rotation is succeeded, and a step in which, when the detected pressure lowers to the lower limit setting value or lower, the feeding is restarted.
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