METHOD AND DEVICE FOR BALLS HEAT TREATMENT Russian patent published in 2017 - IPC C21D9/36 

FIELD: machine engineering.

SUBSTANCE: method for balls heat treatment after hot stamping or rolling includes levelling of balls temperature in air, quenching from water quenching temperature by cooling the balls in the rotating quench drum, and tempering; at the same time temperature equalization of balls in the air is carried out up to the temperature of quenching, at their separate placement the balls are quenched to the temperature below the start point of the martensitic transformation Mh, at uniform distribution of the balls on the quenching drum working surface and their separate placement in cells, with the washing the balls with water, then low-temperature tempering of the balls carried out in the tempering furnace where the balls are first heated up to the tempering temperature, and then their thermostating is carried out. A device for balls heat treatment is also claimed.

EFFECT: increased service life of grinding balls, production of balls of stable high quality.

26 cl, 7 dwg, 1 tbl