。 Under certain conditions, it is reasonable to directly process products with rolled profiles. Nevertheless, the tool steel that needs to be forged in the manufacturing plant still accounts for a considerable proportion. In addition to the reasons that hot forging can reduce cutting and make full use of steel, the change of forging of tool steel is conducive to improve the internal quality of steel, which has the following functions.

1)—般说来，钢材的截面愈小，锻造比愈大，冶金质量本身就愈好。出此凡是需要先经过改缎再坦行加上的工具毛坯，席尽可能选用较小截面的钢材改锻为较大截向的毛坯，这样有利于保证工具钢内部有较好的冶金质量。

1) Generally speaking, the smaller the section of steel, the larger the forging ratio, and the better the metallurgical quality itself. Therefore, for the tool blanks that need to be changed into satin and then added, the steel with smaller section shall be changed into the blank with larger section as far as possible, which is conducive to ensuring the better metallurgical quality inside the tool steel.

2)改锻使工具钢内部的流线分布比较合理。例如盘形铣刀如果用略大于具外径的钢材落料后直接进行机械加工，从钢材利用率和降低加工成本方面考虑是合理的，然而钢内央杂物排列的方向、碳化物偏析的排列方向都和切削刃口平行，即处于大的受力方向，对使用性能不利c如果用小规格的俐材经过改锻

2) Changing forging makes the streamline distribution in tool steel more reasonable. For example, if the disc-shaped milling cutter is directly machined after blanking with steel slightly larger than the outer diameter, it is reasonable in terms of steel utilization and reducing processing cost. However, the arrangement direction of sundries in the center of the steel and the arrangement direction of carbide segregation are parallel to the cutting edge, that is, they are in the direction of large force, which is unfavorable to the service performance. C if the small-size sharp material is changed and forged

(镦粗后打扁)，则流线呈放射状(径向)分布，改善了铣刀的性能.

(flattening after upsetting), the streamline is distributed radially, which improves the performance of the milling cutter

3)通过改锻商可能改善关键部位的材质，使上具受力严重的部他的材质获得改善，从而收到大幅度提高工具钢寿命的效果。

3) It is possible to improve the material of key parts by changing the forging manufacturer, so as to improve the material of parts with serious stress on the, so as to greatly improve the service life of tool steel.