The Forging Effect Of Tool Steel

Under certain conditions, it is reasonable to use rolled profiles to directly process products. The tool steel that needs to be forged in the manufacturing plant still accounts for a considerable proportion.

In addition to hot forging forming can reduce cutting processing and make full use of steel and other reasons, the reform forging of tool steel is conducive to improving the inherent quality of steel, and its effects are mainly reflected in the following aspects.

1. Generally, the smaller the cross-section of steel, the larger the forging ratio, the better the metallurgical quality itself. Out of this, for all tool blanks that need to be modified first and then added, the seats should be forged as much as possible from steel with smaller cross-sections to blanks with larger cross-sections, which will help ensure that the tool steel has a better metallurgical quality.
2. The forging is changed to make the streamline distribution inside the tool steel more reasonable. For example, if a disk milling cutter is directly machined with steel with a slightly larger outer diameter after blanking, it is reasonable in terms of steel utilization and reducing processing costs. However, the direction of the arrangement of impurities in the steel and the segregation of carbides The arrangement direction is parallel to the cutting edge, that is, it is in the direction of the greatest force, which is not good for the performance. If a small size material is used for reforming (upsetting and flattening), the streamlines are distributed radially (radial) , Improve the performance of the milling cutter.
3. It is possible to improve the material of key parts by changing the forger, so that the material of the most severely stressed parts can be improved, and the effect of greatly improving the life of tool steel can be achieved.
4. The heating process of forging considers the effect of diffusion annealing. The heating temperature of tool steel for forging can be slightly higher than the heating temperature of steel ingot breaking, because after the billet and rolling, the segregation in the product and the product has been significantly improved. When the steel is changed to silver, the tendency to locally melt when heated is reduced. The higher the heating temperature, the longer the length of the heat preservation, the more significant the effect of eliminating segregation. Obviously, the austenite grains of the die steel grow during the high temperature heating process. It seems that the pressure processing is performed immediately after the high temperature heating, and the English grains can be refined. If the final forging temperature is well controlled, the cooling method after forging Reasonable, it can suppress the appearance of network carbides. It is very important to ensure the RJ workability of the steel and the final use of the parts. Therefore, the final forging temperature of the tool steel is controlled, and should generally be controlled within the range of Table 3.2. .

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