| 摘要 |
PURPOSE: To shorten machining time to a great extent by letting each step section having been formed by deep cutting and rough machining, be furthermore formed into an appropriate number of step sections which are so formed as to be easily finished up with its pitch made small.∥CONSTITUTION: In the rough blanking and machining method, let the pitch in elevation of a raw material m for one time cutting be equivalent to a depth which can be cut out by the entire length of a tool t, so that each step section is thereby formed one after another from an upper section A1 to a lower step section A3 . Next, in a run-up machining work, each step section having been formed by deep cutting and rough machining, is furthermore formed into an appropriate number of step sections a1 through a6 which are so formed as to be easily finished up with its pitch made small. Since the aforesaid machining is carried out upward in such a way as to start at the lower step, and end up at the upper step one after another, cutting can be performed most efficiently by using the entire length or the wide range section of a tool t at the time of machining. Biting of chips and the like is thereby eliminated, the wear of each tool is lessened to a great extent, and the wear of each tool mounting section can also be remarkably reduced.
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