IE S010RESTORATIVE REPAIR ACTS · DECEMBER 2002 — SEPTEMBER 2003
Gears and gear couplings: tooth body grew in service, no-load current dropped
Tooth body built up on all units, pitting disappeared, drive idle current dropped. 0.05–0.95 mm — tooth body thickness of gear pairs and couplings, 320–450 h of service; 4.9–20 % — no-load current of the drives, 8.2 → 7.8 A on the lathe and 75 → 60 A on the hammer (2003).
signed by the shop commissions
What repeated on every machine
| MACHINE, INV. No. AND SHOP | TREATED ASSEMBLIES | SERVICE BEFORE MEASUREMENT | ACT |
|---|---|---|---|
| M 4140 hammer, inv. No. 420141, UGM forge shop | Compressor gearbox, compressor cylinder, bearing No. 3632 | over 350 h | 18.02.2003 |
| N-483 guillotine shears, inv. No. 420313, TsMK | Main gearbox: worm and worm wheel | over 320 h | 13.02.2003 |
| Billet furnace pusher and mill drive, SPTs-2 | Stage I gearbox, gear couplings No. 9 (N-14) and No. 3 (N-11) | over 450 h | 16.09.2003 |
| 16K20 lathe, inv. No. 420699, RMTs-2 | Headstock drive gearbox | 300 h | 18.02.2003 |
Tooth body thickness — comparison across machines
| MACHINE | PART AND MEASUREMENT POINT | BEFORE, mm | AFTER, mm | GAIN, mm |
|---|---|---|---|---|
| M 4140 hammer | Compressor gearbox gear wheel, three points | 10.35–10.75 | 10.40–10.80 | +0.05 |
| M 4140 hammer | Compressor gearbox pinion shaft, three points | 10.50–10.60 | 10.60–10.65 | +0.05–0.10 |
| N-483 shears | Worm sector of the main gearbox | 18.6 | 19.05 | +0.45 |
| N-483 shears | Worm wheel tooth, measurement depth 15 mm | 16.1 | 17.05 | +0.95 |
| Furnace pusher, SPTs-2 | Stage I herringbone gear tooth, module 8 mm, depth 6.00 mm | 10.25 | 10.65 | +0.40 |
| Coupling No. 9 (N-14), SPTs-2 | External tooth, measurement depth 12.00 mm | 14.60 | 15.40 | +0.80 |
| Coupling No. 9 (N-14), SPTs-2 | Internal tooth, measurement depth 12.00 mm | 14.50 | 15.40 | +0.90 |
| Coupling No. 3 (N-11), SPTs-2 | External tooth, measurement depth 12.00 mm | 13.40 | 14.30 | +0.90 |
| Coupling No. 3 (N-11), SPTs-2 | Internal tooth, measurement depth 12.00 mm | 13.50 | 14.35 | +0.85 |
Measurements at marked points at a fixed depth — before the repair and again after the service hours; in SPTs-2 with a ShZN-18 No. 1741 gear tooth caliper.
No-load current of the drives
| MACHINE | MEASUREMENT | BEFORE, A | AFTER, A |
|---|---|---|---|
| M 4140 hammer | Compressor gearbox drive, phases A and C | 75 | 60 |
| N-483 shears | Main gearbox drive, all phases | 45 | 44 |
| 16K20 lathe | Headstock drive, phase by phase | 8.2–9.4 | 7.8–8.5 |
Measured at no load before the repair and after the service hours; on the SPTs-2 furnace pusher gearbox the current was not measured.
M 4140 hammer — compressor cylinder and bearing
| ASSEMBLY | PARAMETER | BEFORE | AFTER | CHANGE |
|---|---|---|---|---|
| Compressor cylinder | Inner diameter, point a | 690.08 mm | 689.88 mm | −0.20 mm |
| Compressor cylinder | Inner diameter, point b | 690.17 mm | 689.75 mm | −0.42 mm |
| Bearing No. 3632 | Radial clearance | 0.15 mm | 0.10 mm | −0.05 mm |
The cylinder diameter decreased owing to the layer built up on the wall: wall thickness gain of 0.20 and 0.42 mm.
What the shop commissions recorded
Current equivalent
- Revitalizant gel for gearboxesGearboxes · transmissions · gear drives
- Revitalizant gel for compressors and bearingsCompressors · bearings · spindles
How such units are treated:
About this result:
Limits of this report: The results refer to the gear drives, couplings and drives of the listed machines of KGGMK Krivorozhstal at 300–450 hours of service; on other equipment and duty cycles the figures may differ. The work was performed by CJSC Krivbassrudprom under contract No. 4626 of 28.11.2002.