| 摘要 |
PROBLEM TO BE SOLVED: To provide a boring method for a hole inclined to the surface of a work piece which can elongate a service life of a press die without applying transverse stress to a blanking punch, and a press die. SOLUTION: The method is constituted of a forging press process, a pad removing process, a tapering process, and a taper pad removing process. In the forging press process, an inclined face W1 is formed on the upper face of a work W by operating a punch 10 for forging press to a boring part THx in the inclined work W. In the pad removing process, the pad Wy stuck out on the lower face W2 of the work W caused by the formation of the inclined face W1 is removed. In the tapering process, a tapered recessed part is formed to the work W by operating a tapering punch in the direction approximately perpendicular to the inclined face W1 of the work W. In the taper pad removing process, a tapered hole TH inclined to the work W is formed by removing a protruding pad stuck out on the lower face of the work W caused by the formation of the tapered recessed part. COPYRIGHT: (C)2003,JPO
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