Reasons for not forming wax film when injecting wax into cavity

Hot air was not used at the beginning of wax injection process, so the temperature control was wrong and the hot air temperature was too low.

The special antirust wax for the inner cavity was not heated to 1 15℃, the melted wax was not injected into the reserved wax injection holes with a special pump, the excess wax liquid was not allowed to flow out automatically within a certain period of time, and it was not blown to normal temperature with cold air in the cooling area, and all the wax injection holes were not sealed.