This is a process in which effectively two draws are carried out in a single stroke of the press. It involves the use of all three cylinders and provides a means of achieving very deep draws in symmetrical compinenets such as saucepans etc. Double reverse drawing is a further development of this method in which a fourth cylinder is employed to produce the re- quired diameter. The material is reversed twice during the single working stroke of the press to obtain extremely high draw ratios. |
![]() Fire extinguisher (left), reverse drawn with subsequent reduction of diameter. In the middle, the bottom section of a compressed air canister which has been reverse drawn at the same time as three holes have been punched. Horizontal silencer part manufactured in one operation with simultaneous hole punching and flanging. |
![]() Oil filter in 0.7 mm sheet metal. An example of double reverse drawing. | ![]() Cylindrical can in 0.22 mm sheet steel and spotlight in 1 mm aluminium, both components reverse drawn. |