The invention relates to the field of
casting evanescent dies, in particular to the technique for
casting a gray
cast iron thin-wall
pipe fitting evanescent die. The purpose that the technique for
casting the evanescent die is applied to the field of gray
cast iron thin-wall
pipe fitting production is achieved. The technique for casting the gray
cast iron thin-wall
pipe fitting evanescent die comprises the steps of bead pre-foaming, die manufacturing and forming, white die
drying and bonding,
coating,
drying, encasing, vacuum-assist pouring and out-casing and
grinding. The die manufacturing and forming comprises that the steps of operating a make-up
machine to close the die, filling a model of the make-up
machine with EPS beads obtained in the step of bead pre-foaming, filling the model of the make-up
machine with steam, cured EPS beads and the formed white die, filling the model of the make-up machine with cooling water to be cooled and operating the make-up machine to open the die and taking out the white die. The technique is improved reasonably, the defect of
caliber of a gray cast iron thin-wall
pipe fitting can be effectively avoided, the quality of the gray cast iron thin-wall
pipe fitting is improved, and the technique is suitable for being used for manufacturing a high-precision and high-quality gray cast iron thin-wall
pipe fitting.