For cracking of large components arising from the heat process

the factors

such as quenching thickness

heating temperature and cooling speed will be considered during normal production

while over-quenching will be always ignored.By taking a large sprocket wheel cracking after the heat process as an example

the over-quenching is point out as the main factor of forming such cracking based on analysis of chemical composition of the material and heat process.Moreover

a mechanical machining method is proposed aiming to repair such cracking and a finite element analysis is used for stress analysis on machined sprocket wheel to provide theoretical basis for the production.