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Hollow balls are the other main consumables in E-mill which essentially aid in crushing. Fill in balls are used in certain sizes of mills after a certain running hours when there is additional space on track, because of wear of initial Hollow balls.
They are supplied in both machined and un-machined condition, with close tolerances, so that there is minimal vibration in the initial start up of the mill.
SBIPL supplies Hollow balls and Filler balls for the below sizes of mills.
| Sr. No. | Mill Size | Hollow Balls | |
|---|---|---|---|
| Main Ball | Filler Ball | ||
| 1. | E – 70/62 | Sph. Ø 534 x 83 Thick | Sph. Ø 482 x 57 Thick |
| 2. | EL – 76 | Sph. Ø 312 x 100 Thick | – |
| 3. | 8.5 E.9 | Sph. Ø 734 x 102 Thick | Sph. Ø 663 x 67 Thick |
| 4. | 8.5 E.10 | Sph. Ø 656 x 97 Thick | Sph. Ø 585 x 61 Thick |
The specification for Hollow Balls in Low Alloy composition is as below. Specification for Hi-Cr is available on request.
| C | Si | Mn | S | P | Cr | Mo | Ni | Hardness | |
|---|---|---|---|---|---|---|---|---|---|
| MIN. % | 0.70 | 0.40 | 0.80 | – | – | 2.20 | 0.40 | 0.60 | 350 BHN |
| MAX. % | 0.85 | 0.50 | 1.00 | 0.04 | 0.04 | 2.40 | 0.60 | 0.80 | 425 BHN |