| 摘要 |
A hot shaping die for the production of steel shaped parts comprises first and second die parts 2,3 which can be moved from a feed position to a shaping position. The working surfaces of the dies have surface portions having different roughnesses. The smoother surface portions provide more rapid cooling and so produce a pressed component zone 5 which is stronger, preferably martensitic. The lesser surface contact area of the rougher surface portions provides slower cooling and so softer more ductile pressed component zones 8, preferably bainitic. The rougher surface may be provided by a linear or punctiform structure or raised areas with a waffle, ribbed or honey-comb structure. The rougher surface may comprise linked channels opening to the edge of the rougher surface. A temperature sensor may be utilised for control of a pump supplying cooling medium to cooling channels of the die. The ductile zones may provide for post production processing such as stamping or drilling. May be used to produce parts requiring differing strengths such as those relating to the crash behaviour of a vehicle. |
