When purchasing and using universal joint die forgings, it is necessary to correctly understand the main factors that affect the quality of die forgings, mainly including defects of raw materials, heating specifications, die forging process, etc., to better ensure the quality of die forging.

When producing die forgings such as steel ingots and steel, there are residual shrinkage holes, bubbles, pores, slag inclusions, etc., which may cause the forgings to crack. Even if there are scratches, scabs, folds and cracks on the surface of raw materials, it will also cause defects to the forgings. Therefore, raw materials must be inspected in die forging production.

When forging large die forging and alloy steel die forging, if the heating speed is too fast and the temperature difference between the inner and outer layers is large, the central part will crack due to temperature stress and structural stress. However, when the heating temperature is too high and the holding time is too long, resulting in slight overheating, crystal clear intergranular fracture will occur. Therefore, we must control the heating specification well. In order to refine the grain, improve the structure and improve the mechanical properties, the steel with this structure must be completely annealed and recrystallized.