​Stamping die is a special process equipment that processes materials (metal or non-metal) into parts (or semi-finished products) in cold stamping processing, called cold stamping die (commonly known as cold stamping die). Stamping is a pressure processing method that uses a die mounted on a press to apply pressure to the material at room temperature to produce separation or plastic deformation, so as to obtain the required parts.
Different smelting process
The smelting process of Dachang material is electric furnace smelting + off-furnace refining + vacuum degassing. The chemical composition of the steel in this process is controlled accurately, the gas content in the steel is low, and the purity of the steel is high. Small factory materials are generally medium frequency furnace fusion scrap steel and charge, direct casting of flat steel ingot, this process chemical composition deviation is large, more impurities in the steel, high gas content, resulting in more finished products shrinkage, internal cracks, etc., seriously affect the processing performance of steel

The rolling process is different
It is a continuous rolling process in which the ingot is forged and then rolled. The small mill material is made of ingot rolled back and forth directly by single mill. The ingot has small deformation, small rolling ratio, uneven internal microstructure and large non-metallic inclusion particles. It is directly manifested as the local "saw does not move, drill does not move".

Appearance quality difference
Because the dachang material is continuously rolled, and the number of deformation is more, the accuracy of its appearance size is higher, and the two sides are approximately right angles. Because the production process of small factory materials is controlled manually, its appearance size deviation is large, the thickness width tolerance is large, the flat steel round corner is large, and the section deviates from the rectangle.

The heat treatment of the finished wood is different
After the material is finished, the global annealing process is used to ensure that the carbide level in the steel is not more than 4, and to ensure the uniformity of hardness. Small factory materials are used in general softening annealing process, and even natural cooling, which can not ensure the uniformity of carbide grade and hardness in the steel.

Use effect is different
The difference in production process directly affects the use of materials. First of all, the size deviation of small factory materials is large, and the flatness is poor, resulting in a large enough processing margin during processing, otherwise the processing will not come out. Secondly, due to the uneven hardness of the small factory material, the processing is difficult to punch, the processing efficiency is low, the workpiece is easy to deform after processing, and even the phenomenon of mold scrapping.

Third, the impurity content of small factory materials is high, the gas content in the steel is high, and the carbide distribution is very uneven, resulting in serious deformation of the mold during heat treatment, and even heat treatment cracking phenomenon so that the mold is scrapped.
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