The hot rolling mill is the heart of metal rolling production. Its operational condition directly impacts product quality, production efficiency, and operational costs. A scientific and systematic maintenance and repair strategy is crucial for ensuring long-term stable operation, minimizing unplanned downtime, and extending equipment service life. This article provides a comprehensive guide to hot rolling mill maintenance.
Maintenance Focus for Key Systems
Mechanical System:
- Roll Bearings: Ensure clean and adequate lubrication; monitor temperature and vibration—key to preventing burn-up accidents.
- Rolls: Regularly regrind to restore roll profile; check for surface cracks and spalling.
- Gear Drives: Periodically inspect gear tooth wear and pitting; ensure proper lubrication.
Hydraulic & Lubrication Systems:
- Hydraulic System: Regularly check oil cleanliness (NAS level); change hydraulic oil and filters. Inspect pipe connections for leaks.
- Lubrication System: Ensure correct oil type; regularly clean or replace filter elements; check oil lines for blockages.
Electrical & Automation System:
- Motors & Drives: Check winding insulation and cooling fans; clean dust.
- PLC & Control System: Backup programs and data; check the tightness of wiring terminals.
- Sensors & Instruments: Regularly clean and calibrate to ensure accurate and reliable signals.
