STEP DRILL BIT AND STEP DRILL BIT MANUFACTURING METHOD
作者： Yamamoto Takahiro
DOI:
关键词: Drill 、 Grinding 、 Drill bit 、 Geometry 、 Grind 、 Rake angle 、 Edge (geometry) 、 Groove (joinery) 、 Materials science
摘要: A step drill and a manufacturing method for in which cutting performance of edge portion can be enhanced are provided. groove (5) includes first ground (50) forming an area embracing second (30) the (3) (51) on heel (7) side relative to (50). Therefore, convex blade part (20a) formed (20) by performing grinding with intersecting each other two passes comprised (51). That is, it is possible form into desired shape during suppress grind stone from interfering radial rake angle suppressed becoming large negative thus enhanced.
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