Every steel rolling mill has certain quantity of spare parts to replace the failure parts, some key spare parts of rolling equipment and supportive devices need to be ordered for urgent replacement timely.
1. Rolls
- Working Rolls: The number varies depending on the number of rolling stands, typically each stand has at least 2-4 spare rolls.
- Backup Rolls Each rolling stand usually requires 1-2 spare backup rolls.
- Guide Rolls:
2. Bearings
- Roll Bearings: Each roll requires a pair of bearings; spare quantities are usually 50%-100% of those in use.
- Other Bearings: Such as gearbox bearings, motor bearings, etc., spare quantities depend on wear rates.
3. Gearboxes
- Depending on the length and complexity of the production line, one to two spare gearboxes may be needed per production line.
4. Hydraulic Cylinders
- Used to adjust the gap between rolls; each rolling stand may require 1-2 spare hydraulic cylinders.
5. Motors
- Spare quantities depend on the type and number of production lines; typically, one to two spare motors are kept for each model.
6. Couplings
- At least one spare coupling is provided for each drive connection.
7. Brakes
- One to two spare brakes are kept for each braking system.
1. Cooling System Components
- Cooling Pumps: Each pump has one spare pump.
- Nozzles: Several spare nozzles are prepared based on consumption rate.
2. Lubrication System Components
- Oil pumps, filters, one to two spare parts are provided for each system.
3. Automation Control System Spare Parts
- Sensors, actuators, PLC modules, etc.: Several spare parts are kept for each model.
4. Electrical System Spare Parts
- Circuit breakers, contactors, inverters, etc.: One to two spare parts are kept for each model.
5. Shearing Machine Spare Parts
- Shear Blades: Several spare shear blades are prepared based on usage frequency.
- Shearing Shafts: One spare shearing shaft is kept for each shearing machine.
6. Conveyor System Spare Parts
- Chains, rollers, idlers, etc.: Several spare parts are prepared based on wear rates.
7. Inspection Equipment Spare Parts
- Various sensors, probes, etc.: Several spare parts are kept for each model.
1. Seals
- Several spare seals are prepared based on the number of equipment and wear conditions.
2. Fasteners
- To prepare some screws, nuts, washers by actual needs.
3. Wear-resistant Parts
- According application conditions to store wear-resistance parts like guides,etc.
4. Tooling Components
- To store some dies,blades and ecoders for processing machines, the quantity is based on usage frequency.
- The quantity of spare parts should be determined based on factors such as repair history, failure rate statistics, planned maintenance schedules, and supplier delivery times.
- It is important to regularly review spare part inventories for reasonable store.
- For some critical and expensive spare parts, it may be advisable to enter into service agreements with suppliers to reduce inventory pressure.
These spare parts are crucial for ensuring the normal operation of a rolling mill. The actual spare parts list should be customized by professional maintenance teams according to the specifics of the factory.
