Blind hole drilling method and blind hole drilling system

摘要

PROBLEM TO BE SOLVED: To provide a blind hole drilling method capable of simplifying a work process and significantly reducing the number of working steps. SOLUTION: A blind hole machining method includes a preparatory step of preparing a workpiece W having a blind hole 11 formed on a surface WS thereof, and an inner peripheral wall surface 12 of the blind hole 11 closer to a bottom portion 13 than an inner peripheral wall surface 12. An annular groove forming step of forming an annular groove 15 having a large diameter, and a large-diameter hole forming cutting tool 1 having a cutting edge 5 on the outer peripheral side of the tip portion 3 are inserted into the blind hole 11 to remove the cutting edge 5. Inserting step into the annular groove 15, and while pulling out the cutting tool 1 for forming a large-diameter hole, pull out from the annular groove 15 of the blind hole 11 toward the surface WS, cut the inner peripheral wall surface 12 of the blind hole 11, and stop. There is a large diameter hole forming step of forming a large diameter hole 17 having a diameter larger than that of the hole 11. The blind hole drilling system includes a control device that executes the blind hole drilling method. [Selection diagram] Figure 1