METHOD FOR CASTING RING CASTINGS FROM ALUMINUM OR MAGNESIUM ALLOYS Russian patent published in 2022 - IPC B22D13/04 B21H1/06 

FIELD: foundry production.

SUBSTANCE: invention relates to the field of foundry production of aluminum and magnesium alloys, in particular to the production of castings by centrifugal casting, and can be used for the manufacture of large-sized ring castings. A method for producing ring castings from aluminum or magnesium alloys, including putting the alloy into a rotating mold, deformation treatment of castings and annealing of the resulting ring castings. The melt is fed into a rotating mold using an autonomous stationary metal dispenser located coaxially with it, consisting of a receiving bowl and a riser connected to it, having hollow nozzles at the end, each of which has a length equal to 0.7-0.95 of the inner radius of the resulting casting, and a conical channel shape tapering to the output end at an angle of α = 45-60°. In the second embodiment of the method, the melt is fed into a rotating mold using an autonomous stationary metal dispenser located coaxially with it, consisting of a receiving bowl and a riser connected to it, having at the end a horizontal disk with internal through channels whose diameter is 0.7-0.95 of the inner diameter of the resulting casting, while the channels are made with a radius of 0.25-0.45 of the inner radius of the resulting casting. Annular castings with an adjustable structure, homogeneous and fine grain in cross section are obtained.

EFFECT: low anisotropy of the mechanical properties of the semi-finished product after rolling is achieved, as well as an increase in the metal utilization factor due to a reduction in machining tolerances.

5 cl, 4 dwg, 1 ex