FORGING METHOD FOR METAL PARTS

• Main Author: NAGAIWA HIROYUKI
• Format: Patent
• Language: English
• Published: 30.07.2002
• Edition: 7
• Subjects: FORGE FURNACES; FORGING; HAMMERING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PRESSING METAL; PUNCHING METAL; RIVETING; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a forging method for forming a hollow parts having a deep hole and a branched part formed in a side thereof without defects. SOLUTION: A manufacturing method of a metal parts having a branched part on an outer periphery of the hollow parts having the deep hole comprises a step of inserting a stock 7 in a die, a step of forming a deep hole in the stock by first punch 3 and a counter punch 5 disposed at the position facing the first punch 3, a step of moving the stock to the position passing the space for forming the branched part without changing the relative position of the first punch 3 to the counter punch 5 in the above step, and a step of expanding the stock sidewise by the first punch 3 and the counter punch 5, and a hollow part is formed in the branched part by a second punch 4 successive to the step of expanding the stock sidewise.