| 摘要 |
According to the present invention, a branch pipe is formed on a metal tube with a forming tool comprising a milling part (1a), having a first diameter (L1), which is provided with a prescribed cutting edge on its outer peripheral surface, and a burring part (1b) provided on one end of the milling part (1a) with a slope (1c) having a second diameter (L2) which is larger than the first diameter (L1) and gradually reduced as separated from the milling part (1a). Consequently, it is possible to provide a branch pipe forming tool for forming a branch pipe on a metal tube regardless of the shape of the metal tube and a method of forming a branch pipe on a metal tube with the tool. <IMAGE> |
