| 摘要 |
In a forming tool having a die (1) of steel, especially sintered hard metal, and a prestressing ring (2) surrounding the die (1), to avoid formation of cracks or other fissures in the region of critical die cross sections where stress is concentrated the prestressing ring (2) is constructed so that the radial prestress exerted by it on the die (1) in the region of a transition (3) from one to the other of two converging inner faces (4, 5) of the die (1) which together form an internal angle of less than 180 DEG , is less than in the regions adjacent to the transition. |
