The invention relates to the technical field of
casting, in particular to an exhaust riser-free gold type
evanescent mode modeling method which comprises the following steps: S1, treatment of the bottom surface of an
evanescent mode model: before modeling, a
slag discharge channel placement procedure is not reserved any more, and the bottom surface of a gold type
evanescent mode is directly prepared; s2, sand box overturning operation: overturning the sand box; s3, air
pipe arrangement, wherein an electric or
pneumatic tool is used for
punching; s4, mounting and sealing an air
pipe: inserting one end of the air
pipe into the bottom surface of the evanescent mode model, treating a gap between the air pipe and the model by using
putty or a
paper adhesive tape, and sealing the other end of the air pipe; and S5, post-treatment is conducted after modeling is completed, specifically, a
slag discharging channel and an exhaust riser are not placed on the bottom face any more, and an air pipe channel is filled with molten iron after
casting is completed. According to the invention, residual substances after foam
combustion can be smoothly discharged out of the sand box, so that the risk that residues are generated on the surface of a
casting is further reduced.