These defects are caused during the heating of the billet due to the unreasonable formulation of the heating process (heating specification) or improper heating operation. The correct heating method is to formulate reasonable heating specifications and strictly enforce the heating specifications. Defects should be minimized or fundamentally prevented from occurring, and the billet should have excellent heating quality.
The basic principle for determining the forging temperature range, the metal forging start temperature and the forging end temperature, that is, the temperature interval between the forging temperature and the forging temperature is called the forging temperature range.
Starting from improving the plasticity and reducing the resistance to deformation, it is hoped that the heating temperature of the metal can be increased as much as possible. However, starting from ensuring the quality of the product and avoiding defects during heating, the heating temperature is too high and not good. In order to reduce the number of fires, save energy and improve labor productivity, not only the heating temperature is high, but also the temperature at the end of forging is expected to be lower; but in order to avoid severe work hardening and the occurrence of forging cracks, the temperature should not be too low. It can be seen that these factors are contradictory and mutually restrictive, so the determination of the forging temperature range must be fully considered.