How to drill the hole on the circles
The invention discloses a method for machining a flange of a drill hole of a pipe. The pipe to be machined is fixed to a clamping die of a CNC machining center, first, a round hole is drilled in the surface of the pipe to be machined through a drill, then the round hole is modified into an oval hole, the drill for the drill hole is replaced to be a drill with a protruding portion, the drill with the protruding portion extends into the inner wall of the pipe from the oval hole, the drill with the protruding portion is driven by the CNC machining center to rotate and lift the flange upwards, the height of the flange of the drill hole is decided by the lifting stroke of the drill with the protruding portion, the lifting stroke is set by the CNC machining center, and after the flange hole is preliminarily formed, the flange hole is polished to be smooth through an edge grinding cutter. According to the method for machining the flange of the drill hole of a pipe, the control machine is automatic, the machining process is fast and simple, if a plurality of flange holes need to be machined in the surface of the pipe, it can be ensured that the multiple flange holes are on the same straight line, the distance between the multiple flange holes also can be precisely controlled, and a machining precision is high.
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