Surface treatment method of insert in vacuum casting and APG processes

The invention relates to a surface treatment method of an insert in vacuum casting and APG processes, which is realized by the following steps: preparing adhesive: mixing 100 parts of epoxy resin, 50 parts of phenolic resin, 175-200 parts of toluene and 175-200 parts of butanone, and stirring the mixture for 2-2.5 hours at the normal temperature; adding 1.5 parts of 2-ethyl-4-methylimidazole and stirring for 0.4-0.6 hour at the normal temperature; adding 8-10 parts of QS toughening agent and stirring for 0.4-0.6 hour; standing for 12-24 hours; cleaning the insert; airing; sealing insert: sealing the non-adhesive part with a transparent adhesive tape according to the pattern requirement, and tearing the transparent adhesive tape after the adhesive is solidified; gluing for 2-4 times at the normal temperature, wherein after the glue coated in the previous gluing process is aired, the next gluing process is carried out; preheating the glued insert, wherein the preheating temperature is 135-145 DEG C, and the preheating time is 1-1.5 hours; and taking out the insert and reserving the insert by covering for later user. The invention has the beneficial effect that because a buffer layer is additionally arranged between the insert and an epoxy material, the invention prevents gaps from occurring between the insert and the epoxy material because of larger difference of thermal expansion coefficients.