The invention discloses a hole-
machining tool with an independent
drill tip in center. The hole-
machining tool with the independent
drill tip in center comprises a tool body and the
drill tip, the drill tip comprises an inner drill tip and an outer drill tip which are independent from each other, the outer drill tip is arranged on the tool body, the inner drill tip is arranged at the center of theouter drill tip in a penetrating mode and is arranged on the tool body, and the
cutting depth of the inner drill tip is larger than the
cutting depth of the outer drill tip. The drill tip is composedof the inner drill tip and the outer drill tip, the inner drill tip and the outer drill tip sequentially
cut into a workpiece in a layered mode along the
cutting depth direction, the inner drill tipcuts into the workpiece stably and then the outer drill tip cuts into the workpiece, so that the time for the drill tip to
cut into the workpiece is prolonged and the stability of the drill tip duringdrilling into the workpiece is greatly improved; due to the fact that the inner drill tip is independent from the outer drill tip, the inner drill tip is provided with a small drill tip angle, the outer drill tip is provided with a large drill tip angle, the tool can be prevented from drilling excessively fast in the
cut-in process, so that excessive
extrusion to cutting edges by cut chips can beprevented, and the stability of the tool during cutting into the workpiece is improved; and the inner drill tips can be interchanged in batches, flexibly combined and installed on the outer drill tip, so that the inventory of hole drilling tools is greatly reduced.