Grinding balls are used to grind materials into fine powders. It is used to mix materials such as mineral ores.
Ball Mills
For the ball mill to work properly, it must reach critical speed. This is the speed at which the grinding balls start to spin along the ball mills’ interior walls. If the ball mill does not reach critical speed, the grinding balls will stay at the bottom. They won’t be able to grind the material properly.
Grinding balls are used to grind or blend materials. A grinding ball works on the principle of impact and attrition. These days they are much more scientific and ASE manufactures them in alloys like 70Cr2 which are especially suited to the tasks they have to perform creating less wear and far greater efficiency in production. We will give you advice on which balls are best for your specific needs.
Grinding Ball Media Selection
When choosing a grinding ball and other grinding media, it is best to use a “Less is more” approach. The best course of action is to choose the grinding ball (or grinding rod, for that matter) with the smallest diameter that will break down the material being ground effectively.
Choose the size of the grinding balls with caution. If the selected grinding balls are too small, they may flow out of the mill as part of the waste material. A grate discharge mill will reduce this risk.
For the primary grinding stage, select larger-sized grinding balls.
In the secondary stage when finer grinding is performed, use a smaller grinding ball initially and move down in size.
Density is another important consideration. A grinding ball should be large enough that there is no danger of any of them floating on top of the material being ground.
Grinding balls are made for durability. You will want to ensure that the grinding balls you are looking at aren’t so solid that they will wear the tumbler down more quickly than normal.
Some grinding applications may have specific requirements. If keeping contamination down is a consideration, the grinding balls and media are chosen based on their level of ease of separation from the material.
Quality Control
Several tests performed like Composition, Size & weight Tolerance, Hardness, Impact test, Grain size, Metallographic and Dropping test.
Technical Specification of Steel Ball
| Material Standard | ||
| Europe | Germany | |
| EN | DIN | WR |
| 70Cr2 | 70Cr2 | 1.2007 |
| Physical Properties | |||
| Material | Size | Volumetric Hardness | Surface Hardness |
| 70Cr2 | 20 – 150 mm | 58 – 65 HRC | 55 – 65 HRC |
| Chemical Analysis | ||||||||||
| %C | %Cr | %Mn | %Si | %P | %S | %Cu | %Ni | %Mo | %Sn | %Al |
| 0.65-0.75 | 0.55-0.70 | 0.75-0.90 | 0.2-0.3 | ≤0.03 | ≤0.03 | ≤0.30 | ≤0.4 | ≤0.1 | ≤0.06 | ≤0.1 |
| Packing | |
| Type | Weight |
| Jumbo Bag | 1000 kg |
| Drum | 850 – 950 kg |
| Metallographic structure and crack detection procedure |
| Metallographic structure: Mass production is based on approved temperatures and durations to reach uniform tempered martensitic with low percentage of austenite structure in balls, which shall be validated in test production. |
| Crack detection analysis: Balls are tested to be crack free (Magnetic particle examination method) and ultrasonic testing. According to the results we guarantee least breakage rate of the balls. |