| 摘要 |
PURPOSE:To improve durability of a roller dies by making the cramp pressure of a die cramping from the left and right a main body with a face to form a V groove at an external periphery, larger than a holding pressure of the roller dies. CONSTITUTION:A mainbody 4 with a face 2 to form V groove of a prescribed width at an external periphery, is cramped from the right and left by cramp dies 3, 4 and rotated by a motor and etc., and by pressing a roller dies with a prescribed number of shevron 10 formed at an external periphery, against the face 2 to form V groove so as to form a V groove 11. Then a cramping pressure holding a main body 1 of cramp dies 3, 4 is made as over 110 assuming that the holding pressure of the roller dies 9 to the main body as 100. Thereby, an elongation of the main body 1 towards the axial direction caused by the pressing of the roller dies 9 is prevented, and a flange like part 12 is formed at relief grooves 5, 6 of excess metal holding faces 7, 8 so that an axial force is not applied for the shevron 10, and the damage of the roller dies 9 is prevented, and as a result, the durability is improved. |
