IE S046GEARBOX TREATMENT REPORT · BAKU STEEL COMPANY
Rolling mill gearbox: radial clearance reduced at 11 of 12 points, scoring filled without teardown
Radial mesh clearance decreased at most points, galling and pitting filled in, the contact area evened out. 0–0.6 mm — radial clearance in the mesh, 1.2–1.6 → 0.9–1.2 mm; 0.05 mm — radial play of the shafts, 0.75 → 0.70 and 0.60 → 0.55 mm (2001).
with signatures and stamps of both parties
Key results
| EQUIPMENT | CONDITION AT START OF TESTING | WHAT WAS MEASURED |
|---|---|---|
| CONTI – 1 (FLANDER) power gearbox, roughing group of the stand No. 5 line | Pinion and gear wheel teeth worn due to overheating; pitting and scoring on the teeth | Radial (S) and backlash (N) clearances in the mesh — 12 points; condition of the tooth surfaces |
| High-speed and low-speed shafts of the same gearbox | Scatter of clearances across measurement points — a sign of heavy tooth wear on both shafts | Radial play of each shaft before treatment and after 950 h of operation |
Gear mesh clearances — before treatment and after 950 h of operation
| SHAFT ROTATION | PART | RADIAL CLEARANCE S, BEFORE → AFTER | BACKLASH N, BEFORE → AFTER |
|---|---|---|---|
| 0° | left | 1.6 → 1.0 mm | 1.2 → 1.0 mm |
| 0° | right | 1.3 → 1.0 mm | 1.4 → 1.0 mm |
| 0° | middle | 1.3 → 1.2 mm | 1.4 → 1.0 mm |
| 90° | left | 1.6 → 1.0 mm | 1.4 → 1.0 mm |
| 90° | right | 1.5 → 0.9 mm | 1.4 → 1.2 mm |
| 90° | middle | 1.5 → 1.0 mm | 1.4 → 1.0 mm |
| 180° | left | 1.3 → 1.1 mm | 1.0 → 1.0 mm |
| 180° | right | 1.2 → 1.2 mm | 1.0 → 1.0 mm |
| 180° | middle | 1.5 → 1.0 mm | 0.8 → 1.0 mm |
| 270° | left | 1.4 → 1.0 mm | 1.0 → 1.2 mm |
| 270° | right | 1.4 → 1.1 mm | 1.4 → 1.0 mm |
| 270° | middle | 1.5 → 1.2 mm | 1.4 → 1.0 mm |
Measured with lead plates, values in mm. The radial clearance (C) decreased at 11 of 12 points and did not change at “180°, right”. The side clearance (H) decreased at 8 points, did not change at “180°, left” and “180°, right”, and increased by 0.2 mm at “180°, middle” and “270°, left” — the report gives no explanation for this. According to the report, the build-up on the pinion and gear wheel teeth reached 0.3–0.4 mm.
Radial play of the gearbox shafts
| SHAFT | BEFORE TREATMENT | AFTER 950 HOURS OF OPERATION | CHANGE |
|---|---|---|---|
| High-speed | 0.75 mm | 0.70 mm | −0.05 mm |
| Low-speed | 0.60 mm | 0.55 mm | −0.05 mm |
The report states the same value in prose: “the radial play values of the high-speed and low-speed shafts decreased by 0.05 mm”.
Tooth condition: inspection before treatment and after 950 h of operation
| WHAT WAS INSPECTED | BEFORE TREATMENT | AFTER 950 HOURS OF OPERATION |
|---|---|---|
| Tooth surface | Pitting and scoring, wear due to overheating | Scoring and pits filled with a ceramic layer |
| Layer on the teeth | No coating, worn metal in operation | Build-up on the pinion and gear wheel teeth 0.3–0.4 mm |
| Tooth contact area | Scatter of readings across the points — heavy tooth wear on both shafts | Contact area evened out across all teeth of the high-speed and low-speed shafts |
Surface condition and build-up thickness were recorded by visual inspection of the commission, as stated in the report.
Commission conclusion
Current equivalent
Revitalizant gel for gearboxes →
Industrial gearboxes, final and central drives, truck and tractor gearboxes, open gear and chain drives.
How such units are treated:
About this result:
Limits of this report: The results relate to the CONTI – 1 (FLANDER) power gearbox of the Baku Steel Company (BSC) rolling mill and to its operating conditions; on other gearboxes the figures may differ. RVS is an obsolete XADO designation, the zero-generation formulations; the current product generation is revitalizants.