Wax models of baking is an important procedure to ensure normal casting.In general, 18 k gold molding baking time is 6 ~ 12 hours, platinum molding baking time is 12 ~ 20 hours.Baking mainly include: the effect of dewaxing, drying and casting heat preservation.Roasted with 18 k gold as an example, the temperature of dewaxing of 0 ~ 350 ℃, holding time 2 hours.Drying temperature is 350 ~ 700 ℃, holding time 2 ~ 3 hours.Casting heat preservation temperature is 600 ~ 500 ℃, holding time 1 ~ 2 hours.Finally is the steel casting to make shell.