It is a key factors of good spraying of mould lubricant for obtaining excellent surface quality of the castings.However

the used spraying techniques could not cover the whole surface of the mould

leading to the occurrence of poor spraying effects

partial soldering and pull-failure.Through adopting inner-spraying technology

the problems can be eliminated effectively.The inner-spraying apparatus is composed of spraying channel designed in the mould and an atomizer

exhibiting the features of fully utilizing the pipeline and control unit on the die casting machine.Atomizer directly connect with coating pipe and gas pipe on spraying robot in one end

and connect with inlet of inner-sprayed channel in the mould in other end

realizing the synchronous operation with spraying robot on the die casting machine.The practical verification reveals that the inner-spraying technique can greatly decrease the scrap rate of the die castings.