High-temperature lubricant selection is a critical step for long-term equipment operation, production continuity, and safe operation. Incorrect lubricant selection can lead to wear, carbonization, and failures in bearing, gear, chain, or screw systems. Here's a detailed guide:
1. Selection Criteria
A. Operating Temperature
- Maximum operating temperature should be determined.
- High-temperature lubricants are generally resistant up to 200–300°C.
- Examples: Oven, plastic injection barrel bearings, gearboxes.
B. Viscosity and Adhesion
- Oil viscosity decreases as temperature increases.
- In chain and gear systems, the fluidity and adhesion of the oil must be at a level that reduces friction.
C. Oxidation and Carbonization Resistance
- Oil degradation at high temperatures → carbonization and residue formation.
- Oils with antioxidant additives should be preferred.
D. Food Compatibility
- On food production lines, it is mandatory to use NSF H1 or FDA-compliant food grade oils.
- Even if there is no contact with food, safe options can be preferred for hygiene.
E. Load and Pressure Conditions
- For bearings or gears operating under high loads, EP (Extreme Pressure) additive oils are more suitable.
F. Application Area and Part Type
- Oil of appropriate consistency should be selected for bearing, chain, gear, or screw systems.
- High-temperature greases may be softer for delicate parts, while a thicker or EP additive grease is preferred for gears.
2. Example Use Cases
| Part / System | Recommended Lubricant | Maximum Temperature |
|---|---|---|
| Bearings | High-Temperature Grease | 200–250°C |
| Gears | High-Temperature Gear Oil | 200–300°C |
| Chains | Food Grade Chain Oil | 180–220°C |
| Screw and Barrel Systems | High-Temp Food Grade Grease | 200–250°C |
3. Preventive Measures
- Temperature Monitoring: Critical parts' temperatures should be monitored with thermometers or sensors.
- Regular Maintenance: Lubrication intervals should be planned according to high-temperature conditions.
- Correct Amount: Too much or too little lubrication can lead to carbonization and friction.
- Contamination Prevention: Contact with water, dust, or chemicals should be prevented.
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