The invention discloses a heat-resisting steel connecting
pipe shell
investment casting process. The process comprises the following steps that S1, paraffin is subjected to injection forming, a paraffin pattern is obtained, and an electric
soldering iron is subjected to
welding sticking to assemble a paraffin mold; S2, silica
sol serves as a bonding agent,
zirconium powder filler, a
cracking-prevention agent, a
wetting agent, and a defoaming agent are doped,
slurry is made, the paraffin mold is immersed in the
slurry to subjected to
slurry loading,
zircon refractory is removed, a mold shell isformed, after hardening, repeated operation is carried out for four times, and a mold shell is obtained; S3, the mold shell is placed in a paraffin removal furnace, steam is led in until the paraffincompletely flows out, the mold shell is placed in a modeling
machine to be subjected to sand filling,
roasting is carried out, and a high-strength mold shell is obtained; S4, a heat-resisting steel connecting
pipe raw material is put into a
smelting furnace to be subjected to heat preservation, and
molten metal is obtained; S5, component detection is carried out; S6, pouring is carried out; S7, heat treatment is carried out; and S8,
casting inspection is carried out, and the heat-resisting steel connecting
pipe shell
investment casting process is finished. According to the investment castingprocess, the high-quality
casting can be produced, the
casting yield is high, and phenomena of inclusion and cold shut are not prone to happening.