| 摘要 |
PURPOSE:To press in a lot of parts in a perfect press-fitted state, by independently suspending each punching member and connecting them to each other by a fluid circuit, when the parts are pressed into plural holes of an object to be pressed in, simultaneously by the punching member whic has been provided multiaxially on a press ram. CONSTITUTION:On a loading base 5, for instance, in 4 press-in holes 2 of a brake drum 1, a hub bolt 3 is positioned temporarily. Subsequently, a press ram 6 is lowered to a prescribed position, a head part 3a of each hub bolt 3 is pressed down simultaneously by each punching member 7. In this case, if there are variations in installed height of the hub bolt 3 placed in the press-in hole 2 of the brake drum 1, since the punching member 7 is connected by a fluid circuit 8, the punching member 7 expands and contracts in accordance with height of the hub bolt 3 by incompressibility of a fluid, absorbs the variations of height, and makes pressing force to each hub bolt 3 equal. |
