Starting from improving plasticity and reducing deformation resistance, we hope to increase the heating temperature of metal as much as possible; However, in order to ensure product quality and avoid heating defects, the heating temperature is too high, which is not good. In order to reduce fire, save energy and improve labor productivity, it is hoped that not only the heating temperature is high, but also the temperature at the end of forging is low; However, in order to avoid forging cracks caused by severe work hardening, the forging temperature should not be too low. Therefore, these factors contradict and restrict each other, and the forging temperature range of aluminum alloy forgings must be fully considered
The basic principle for determining the forging temperature range of aluminum alloy: the temperature interval between the start temperature of metal forging and the end temperature of forging is called the forging temperature range.
Basic principles for determining forging temperature range:
1. Ensure that the metal has good plasticity and low deformation resistance within the forging temperature range.
2. Ensure good quality of forgings (referring to internal organization and mechanical properties).
3. The forging temperature range shall be expanded as far as possible to reduce the fire, save energy and improve the forging productivity.
When considering the above principles, we should establish the concept of quality. First, we should ensure good blank heating, aluminum alloy forgings and good plasticity, reduce heating fires, improve labor productivity, and reduce heat loss.
Develop metal heating specifications
In order to achieve the purpose of high quality, high output and low consumption, the relationship between furnace temperature or material temperature and time is specified in each stage of metal heating, namely heating specification. Blank temperature refers to the regulation that furnace temperature and blank temperature change with time. For the convenience of use, the heating specification adopts the temperature change curve, usually the furnace temperature change curve (also known as the heating curve).
The basic principles for formulating the metal heating specification are high quality, high efficiency and low consumption. It is required that aluminum billets do not produce heating defects (cracks, overheating, overheating, gasification, less decarburization), have uniform temperature, short heating time, high production efficiency, fuel saving, etc. during the heating process.