The vacuum heat treatment technology is combined with the traditional heat treatment technology,modern vac-uum technology,computer technology,automation technology,which is a high-performance,high-quality,energy-saving ad-vanced heat treatment technology,with no CO2,no oxidation,and can keep bright surface of parts,skim parts,have the ad-vantages of gas-separation.Deformation-proof,energy-saving,and easy-control,etc.It has been widely used at home and abroad.In this paper,we introduced vacuum oil quenching ...