| 摘要 |
PROBLEM TO BE SOLVED: To provide uniform chamfering by press-holding a columnar die having a conical shape part to work. SOLUTION: A die, which has a conical shape part and chamfers a work and, prevents the work from plastic deformation in a peripheral inside direction and has a hole and a columnar part which is insertable at a spigot and vertically inserted into a hole of work and held with pressure.
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