| 摘要 |
PROBLEM TO BE SOLVED: To forge a hollow parts having the size more than two times of the diameter of a stock material out of the long stock material without producing any scrap, and to remove only a butted terminal section between a preceding stock material and a succeeding stock material during the forging. SOLUTION: A long stock material A is fed so as to be projected by a predetermined length from a die 3. The stock material A is gripped by a grip feed 11, and in this condition, a punch 7 provided with a cylindrical punch body 70 having a forming recess 70a, extrusion pins 72, and a center pin 71 having the dimension same as the diameter of the stock material is advanced to the die side, a front face of the punch body 70 is tightly attached to a front face of the die 3 to form a forming space R. The center pin 72 is advanced into the forming recess 70a, and a projecting part of the stock material A is pressed back into the forming space R and forged into a desired shape. The grip feed 11 is opened, and the center pin is advanced into the die 3, and separated into a hollow parts B having a through hole b and the stock material A. During the forging, the forging load is detected by a detector 15, and when the detected value is equal to or less than the predetermined value, the hollow parts is eliminated as a defective one. COPYRIGHT: (C)2011,JPO&INPIT
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