| 摘要 |
PURPOSE:To increase forming energy and to prevent the failure of a hammer and piston by adding the pressing force of compressed air to the dropping motion of the hammer and applying hammer impact via a liquid layer on a blank material. CONSTITUTION:When a main stop valve 19 of a valve chamber 2 is opened, the compressed air in an air charge tank 1 is fed to a cylinder 3 and presses a hammer 5 to depress a knock 6 engaging with a hammer groove 51 against the force of a spring 8. The hammer 5 exerted with the air pressure falls quickly by its own weight and gives falling impact on a piston 9 via a liquid layer 11 packed above the piston 9 in the lower part, then the piston 9 moles the product blank material 31 in a die base 30 underneath the piston under the large pressure. |
