Standardized full-process inspection for the steel rolling process! By time periods, focusing on key points, preventing faults, and ensuring stable production.
Standardized full-process inspection of the steel rolling process! By time periods, focusing on key points, preventing faults, and ensuring stable production.
80% of the sudden failures in the rolling line are caused by missed inspection items and superficial patrol inspections!
Deviation, tailing, high bearing temperatures, oil and water leakage, steel pile-up slipping, abnormal plate shape... Many workshops seem to have production emergencies, but in essence, they are all due to the lack of daily inspections and failure to detect potential hazards in advance.
If the steel rolling production aims to achieve stable production, improvement in quality, and reduction of faults, it cannot rely on post-event firefighting, but only on
standardized, process-based, and closed-loop inspections. 。
Today, I will present to you a set of
standardized inspection procedures for the steel rolling process in a general format.
It covers four major steps: static inspection upon shift change, pre-start inspection, dynamic inspection during the shift, and post-shift closed-loop inspection. It also includes precise parameter standards, frequently overlooked items and handling requirements. Novices can start using it immediately, and experienced teams can use it as a benchmark for improvement.
I. Handover Static Inspection (Idle Standby State | First Thing to Do Upon Onset)
Core Objective: To identify potential static equipment hazards, prevent starting with faults, and prevent machine accidents at their source.
2. Inspection of Core Components of the Rolling Mill
3. Inspection of Transmission and Connection Parts
Check that the universal shaft, coupling, and safety pin are not deformed, not loose, and have no cracks. The transmission clearance is normal; the static condition of the reducer and gearbox is normal without abnormal noises or oil leakage. The base bolts of the equipment are securely fastened without loosening.
4. Inspection of Cooling and Hydraulic Systems
Check that the cooling water pipeline is unobstructed, the nozzles are not clogged, and the water pressure is stable without leakage; the oil level and pressure of the hydraulic station are normal, the valve group has no leakage, all adjusting oil cylinders are reset to zero and in a normal state, and the status meets the startup requirements.
5. On-site and Instrument Inspection
Clear the debris, accumulated steel, and iron oxide scale around the equipment to ensure the rolling channel is unobstructed; reset the temperature, pressure, and speed measurement instrument values to zero normally, and check that the indicator lights and alarm system have no abnormal errors.
II. Pre-start Inspection with No Load (Trial Operation State | Mandatory Inspection Step upon Startup)
Core Objective: To verify the operating condition of the equipment, identify potential dynamic hazards in advance, and prevent startup failures due to carrying materials.
1. Conduct a 3-5 minute no-load test run of the equipment, continuously listen for any abnormal sounds. The rolling mill, motor, and reducer should have no sharp noises or periodic abnormal sounds, and the vibration should be stable without any abnormalities.
2. Check the oil supply pressure of the lubrication system. Under normal conditions, the pressure should be no less than 0.1 MPa. If the pressure is low, investigate the oil pump operation and pipeline blockage issues to ensure continuous oil supply throughout the process.
3. In the no-load state, verify the roll gap, side guide rolls, and tension reference parameters. Ensure they match the production specifications of the current shift to prevent size deviations and runout caused by parameter misalignment.
4. Check the uniformity of the cooling water and lubricating oil spray, with no interruption or biased flow. The cooling and lubrication status of the bearing housing should meet the standards.
5. Test the effectiveness of the instruments, interlocks, and emergency stop functions. The alarm system should be sensitive and reliable. Only after meeting the conditions for starting production can materials be loaded for rolling.
III. Dynamic Inspection During Shifts (During Production Operations | Full Coverage Every 2 Hours)
Core Objective: Real-time monitoring of equipment conditions, dynamic handling of potential hazards, and prevention of small issues from escalating into batch failures or equipment shutdowns.
1. Temperature Inspection (Core Parameters)
Every shift, conduct regular temperature checks on equipment operation. The standard reference is: the temperature rise of motor bearings ≤ 45℃, the temperature rise of reducer bearings ≤ 50℃, the temperature of the bearing seat of the rolling mill remains stable without a sudden spike, and immediate shutdown is carried out to investigate lubrication, cooling, and imbalance issues if there is local high temperature.
2. Operating Status Inspection
Listen to the operating sounds of the equipment throughout the process and observe the vibration status. There should be no abnormal shaking, no impact sounds, and no intermittent stalling. The running trajectory of the strip steel should be centered, without unilateral deviation, no left-right oscillation, and no tail-swing trend.
3. Dynamic Inspection of the Medium System
Verify the lubrication supply pressure and oil consumption status every 2 hours. Timely replenish the consumed oil; check the cooling water flow and pressure, and ensure there is no blockage or scaling in the nozzles. Daily observe the cooling fluid status. If it changes color or deteriorates, replace it promptly to prevent equipment from overheating due to cooling failure.
Continuously investigate and address issues such as oil leakage from bearing seats, valve platforms, and pipelines. For minor oil leakage, promptly apply sealant for patching; for severe leakage, report and immediately stop the equipment for handling. Avoid prolonged operation with faulty equipment.
4. Inspection of Products and Processes
Real-time observation of the plate surface quality, without scratches, wavy shapes, wrinkles, cracks, etc., with stable dimensional tolerances; if there are process abnormalities, prioritize checking the equipment status rather than blindly adjusting parameters.
5. Auxiliary Precision Inspection (Technical Position)
The team cooperates with technicians to regularly use temperature gauges and vibration meters to detect equipment data, record key data such as bearing vibration, temperature, and oil status, providing data support for equipment maintenance and spare parts replacement.
IV. Post-Shift Closed-loop Inspection (Shutdown Completion | Clearing All Hazards and Closing the Loop)
Core Objective: Clear all hazards from the current shift, standardize the standby state of the equipment, and ensure a smooth startup for the next shift.
1. Thoroughly clean the surface iron sheets, oil stains, and residual steel materials on the rolling line equipment, clear the cooling nozzles and drainage pipelines, and keep the equipment clean and unobstructed.
2. Conduct a comprehensive review of all seals, bolts, and pipeline conditions. For minor leaks and loose issues from the current shift, uniformly rectify and close the loop. Issues that cannot be dealt with immediately should be detailedly registered and photographed for archiving.
3. Standardize the resetting of all process parameters, roll gap, guide rail benchmarks, and close the water, electricity, gas, and oil valves to prevent equipment from being under pressure, with materials, electricity, or water overnight.
4. Complete the filling of the inspection record form, truthfully record the equipment operation status, hazard issues, and handling situations, and conduct team handover to ensure that problems can be traced and hazards are not left behind.
V. List of High Frequency Omission Items and Pitfalls in Rolling Steel Inspection
❌ Only check the oil level, without inspecting the emulsification and deterioration of the lubricating oil, resulting in high-temperature burnout of the bearings
❌ Start the machine without conducting no-load test runs, directly introducing hidden abnormal sounds and vibration hazards into production
❌ Ignore the blockage and deviation of the cooling water nozzles, causing local overheating of the bearings and a sudden drop in service life
❌ During production, only focus on product quality, neglecting equipment vibration and abnormal sounds, leading to sudden steel stacking stoppages
❌ Post-shift hazards are not registered or closed-looped, small problems accumulate into major faults and batch scrap
❌ When changing specifications or raw materials, do not re-check the benchmark parameters, resulting in continuous deviation and size deviations
Six. Three Golden Principles for the Implementation of Standardized Inspection
1. Time-based inspection, without going through the motions
Static inspection ensures machine startup, no-load inspection prevents initial faults, dynamic inspection maintains stability throughout the process, and post-shift inspection clears potential hazards. All four steps in the closed-loop process are indispensable, and inspection must not be conducted based on experience or intuition.
2. Parameter alignment, without relying on the naked eye
All temperature, pressure, oil level, and clearance are aligned with standard parameters. Eliminate subjective judgments based on "looking normal" and use data to control the equipment status.
3. Hidden danger closed-loop management, no leftovers
Small hidden dangers are rectified on the spot, major ones are registered and reported, and equipment is shut down for handling. All issues have records, measures, and results, achieving full closed-loop management of inspection.
Conclusion
Rolling steel production:
Steady production depends on equipment, and equipment relies on inspection. 。
Standardized equipment inspection is not just a formal task; it is the key measure to reduce equipment failures, minimize product waste, extend equipment lifespan, and enhance the production capacity of the team. Only by strictly implementing the entire process of equipment inspection can we completely abandon the "passive firefighting" approach and achieve stable and efficient production.
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