| 摘要 |
PURPOSE:To form a longitudinal hole in a solid T-shaped crude material by a forging machine having only a longitudinal cylinder by mounting a solid T- shaped crude material in two-segmental dies in inverted T-shape, inserting said dies in an external die and pressing in a punch. CONSTITUTION:A heated solid T-shaped material 100 is inserted in two-segmantal dies 2 in inverted T-shape and this two-segmental dies 2 are inserted into an external die 1 and held. Then, a guide jig 4 havng a through hole 4a corresponding to maximum diameter of a punch 3 and outer diameter of which fits to forming face of two longitudinal grooves of sectional dies 2 is placed on upper end face of the solid T-shaped material 100. The external die 1 is fixed on the table of a forging machine and the tip of the punch 3 is inserted into the through hole 4a of the guide jig 4, and pressed in the solid T-shaped material 100 guiding the punch 3 to the through hole 4a. By this way, a longitudinal hole 100a is formed, and at the same time, excess metal pushes up the guide jig 4 and goes up in the two-sectional dies, and the products such as a T-shaped tube joint etc. are forged. |
