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Grinding method

Grinding method

Grinding balls produced by the <Dzulakentron> JSC  are used for dry and wet grinding of ore, clinker, limestone, coal and other materials.  Due to the equal hardness along the ball surface and high hardness trought the whole section of grinding balls, they are wear-resistant and keep their shape during exploitation. Consider the surface hardness of balls, as well as the inner layer of high hardness, during the operation balls are developed slowly and equally. Grinding balls quality certificate is issued by the attested laboratory of metals of the Plant Energosteel. The technical support department provides quality guaranties. Grinding balls packing: products are loaded in big-begs with 1-1,5 tn; in bulk; on customers request in metal drums, wooden crates and in bulk with covering under shields.

 Technological scheme of balls production

The method of balls rolling on ball- rolling mill is one of the most modern and economical methods of production and has a number of significant advantages compared to casting and forging ones.  Casting or forging of the balls are not very efficient, and are accompanied by significant loss of the metal. Transversal rolling of balls from the round billet is economical. It differs from other methods due to the possibility to produce grinding balls on the uninterrupted automated aggregates, that allows 2 to 8 times to increase the output and 10-15% to reduce the consumption of metal.

ձձձ  Pre-production control of billet.

For the production of grinding balls the <Dzulakentron> JSC uses hot rolled round bar from carbon and low alloy steel, produced by leading Russian and Ukrainian metallurgical companies according to GOST 2540-88 and GOST 1050-88. Before the production process the billet passes through the rigorous control on geometrical parameters and chemical composition.

222  Heating of billet.

Heating is performed in modern inductive heating furnace, which ensures accurate temperature of rods at the outlet. Most ball manufacturers use gas furnaces which have a lot of significant disadvantages compared to inductive smelting furnace:

  • they don’t allow to heat billet for the precise rolling and necessary hardening because of its large lifetime;

  • in the process of billet heating in the gas furnace the cinder layer is formed on the surface. It leads to the steel decarbonization, and thus to the loss of balls surface hardness and strength;

333  Grinding of balls.

The heated billet enters the inlet of screw gauges where it is grinds:

666  Heat treatment.

Grinding balls come from screw gauges outlet to shelves of the quenching drum through the inclined chute.  After the quenching bath hardened balls come into package where self-tempering of the balls before loading takes place.