MANUFACTURING OF MILL BALLS

Mill balls.

Bodies for crushing of mineral ore are of various forms, such as a ball, cylinder, cylindrical pebbles and etc., and are made by means of casting, rolling, pressing and forging. The most widespread there are technologies of rolling and casting.

 

Rolled ball.

A technology of cross-rolling is most advanced technology from all technologies applied today. Though this technology has the low cost price and high efficiency, but in the course of thermal processing only the surface part receives high hardness, and after certain time when the limit of internal metal fatigue came at the level of ball 2/3 bodies, intensive deterioration of a ball begins. In other words, unit expense and wear resistance of this technology are rather low.

 

Cast ball.

It is already proved by practical use that the mill ball, made by a method of casting from pig-iron with the high content of carbon and improving additives as chrome, manganese, ferrosilicium etc., is used much longer and has higher wear resistance. Improvement of structure of pig-iron at the expense of chrome, manganese and other precious metals alloys considerably reduces abrasion and accordingly the ball consumption, therefore despite the high cost price and low productivity of this method, many mining enterprises in the world widely use balls, which were cast of pig-iron with the high maintenance of chrome and manganese, for the purpose to lower the end-product cost price.
 

STANDARD SPECIFICATIONS: 

Diameter:         40, 60, 80, 100 and 120 mm
Standard:        Russian Standard ГОСТ 7524-89 (ТУ 1141-1697) 
Hardness group:     2-3
Hardness:         375-500 НВ (42-51 HRC)

 

C

Mn

Si

Cr

S

P

Hardness HB

Hardness HRC

1.7-3.5

0.9-1.5

0.9-1.8

2,0-3.8

to  0,15

to 0,15

401-500

42-51

 
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