Introduction on the Steel Balls of Ball Mill Grinding Machine

During the operation of ball mill, the steel balls are the grinding medium of ball mill to grind materials and playing an important role. Through the collisions and frictions between steel balls with ball mill, and steel balls with materials, it generates the grinding and peeling effect. The following is a brief induction on the steel balls.

The Classification of Steel Balls

1. Forging steel ball. This sort of balls take the raw steel as raw material and is made through heating and high-temperature forging. These balls are of high surface quality, excellent impact resistance, strong toughness, good wear resistance, and invulnerable to breakage and out-of-round.

2. Casting steel ball. In this group, the balls use waste steel residues as raw material, mixed with ferrochrome and other alloys, and is made by die casting. High chromium casting ball is a kind of high-rigidity and high-quality wear-resistant material and has been widely used in the dry-process cement ball mill. But the high chromium casting ball is of poor toughness, so it is liable to breakage in the ball mill grinding machines whose diameters are greater than 3 m, and its price is higher.

The Requirements on Ball Diameter

The output of ball mill is not only influenced by the loading capacity of steel balls, but also related to ball diameter. The balls are requested to have a certain diameter and different diameters should be in line with a certain ratio, generally speaking, ball diameter inside the cylinder should be within the range of 25 mm to 60 mm. The steel ball diameter chosen also have something to do with material thruput in unit volume.

The Influence of the Casting Process on Steel Balls

In the design of ball mill, Fote Machinery holds that the manufacturing process of steel balls is another key factor determining its service life. If there exist any defects on steel ball surface or internal in the manufacture, such as shrinkage cavity, crack, and intracrystalline, it will lower the performance of steel balls, or even result in breakage. Therefore, in the production of steel balls, we must formulate reasonable forging, casting and heat treatment process.