Acceptance Rules and Quality Control Methods Of Grinding Balls
Technological process control of forged steel grinding balls production
Metrological assurance the technological production process and quality control of steel grinding balls should comply with Table. 1.
Table.1. Metrological assurance the technological production process and quality control of the grinding balls
| Technological operation | Controlled parameter | Measurement units | Measuring tools | Measurement range | Accuracy class, graduation value | Measuring tool error |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Loading billet into the furnace | Billet diameter
Billet length
Billet curvature |
mm
mm
mm |
Slide Calipers
GOST 166 Measuring roulette GOST 7502 Measuring ruler GOST 427 |
0-300
0-10000
0-150 |
2class,
0,1 3 class, 1,0 1,0 |
± 0,5 |
| Billet heating at induction furnace | Billet temperature at the furnace exit | 0С | Photo Pyrometer «Quartz-M» | 0-1300 | ± 1 | |
| Acceptance of rolling rolls | Caliber dimensions in the calibration section | – | Cake Size Patterns | ± 0,5 | ||
| Rolling rolls setting | Rolling rolls inclination angle | 0С | Arrowhead with a degree scale
|
0,5 | ||
| The rolling:
– Rolling temperature regime
– Rolling control process |
Metal temperature before rolling
Grinding balls diameter
|
0С
mm |
Photo Pyrometer «Quartz-M»
Slide Calipers GOST 166
|
0-1300
0-250
|
2 class, 0,1 |
± 1
± 0,5 |
| Grinding balls quality control | Grinding balls hardness
Grinding balls diameter
Impact resistance
|
HRC, НВ
mm
J |
Hardness tester НRA-2 Emco Test
Slide Calipers GOST 166
Copper installation of vertical type |
20-70
0-250
0-6737,5 |
2 class, 0,1 |
± 2
± 0,5
|
| Grinding balls thermal hardening | Drum rotation frequency
Movement rate of the chain bucket conveyor |
V (volt)
m/с
|
2……9
0,06…0,3
|
|||
| Grinding balls self-release duration |
hour |
Clock |
0-96 | 0,1 | ||
| Shipment | Grinding balls mass | tone
tone |
Carriage scales PC-150TS13V1
Tensiometric, non-foundational, automobile scales PULSAR 2.791.029 RE |
7,5-150
0,6-60 |
0,05
Normal |
From ± 20kg Tо ± 60kg
|
Allowed to use newly developed or other similar means of measuring equipment that meet the accuracy requirements of the instruction, attested in the established order.