the last process is the heat treatment process of the large gear ring. Although the gear has been formed, the treatment of this last process will still affect the quality of the casting. Next, let's take a look at the heat treatment process of the large gear ring.
There are often coarse dendrites and segregation in the post-casting structure of post-cast heat-treated steel castings. In order to eliminate their influence on the final heat treatment of the large gear, it needs to be homogenized. After the steel casting is solidified and cooled, since each part has different degrees of casting stress, the heating speed during heat treatment must be strictly controlled, and intermediate heat preservation is required.
The original structure of the normalizing process gear should be uniformly refined ferrite and pearlite structure before quenching and tempering. After quenching and tempering, uniform tempered sorbate can be obtained, which can obtain good comprehensive mechanical properties, while reducing deformation and Tendency to crack.
In order to meet the requirements of the internal structure of the castings before quenching and tempering, we first normalize the large gear castings to refine the grains, uniform the structure, improve the effectiveness of the final quenching and tempering treatment, and also help reduce the as-cast structure on the performance of the castings after quenching and tempering. And avoid the possibility of deformation or cracking of the gear during quenching caused by the internal casting stress of the casting.
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