Cold Rolling Machine Operation Precautions

As the core equipment of metal processing industry, cold rolling machine is widely used in the precision rolling of sheet and strip. Its operating environment is complex, the process parameters are strict, once the operation error may cause serious accidents or affect the product quality. This paper summarizes the key points for attention from the aspects of safety specification, equipment management, process control, etc., to provide systematic guidance for operators.
First, safety operation standards: to eliminate human risk
Check thoroughly ‌ before operation
Ensure that equipment protective cover, scram switch and interlock device are in good condition to avoid mechanical damage.
Check the electrical system insulation, grounding cable connection is reliable, to prevent leakage accidents.
Clean the debris around the roll and conveyor belt to ensure that the working area is free of obstacles.
Personal Protection and Work discipline ‌
Operators should wear anti-cutting gloves, goggles, anti-smashing shoes and other labor protection products, long hair should be put into the safety helmet.
It is strictly forbidden to adjust the roll or perform cleaning and maintenance while the equipment is running. It is necessary to stop the machine and perform the "lock and hang" procedure.
When more than two people work together, it is necessary to identify the main operator and maintain real-time communication.
Second, equipment maintenance and maintenance: extend the service life
Critical component maintenance plan ‌
Roll system ‌ : Regular inspection of roll surface hardness and finish to avoid scratches resulting in plate surface defects. Special spreader should be used to replace the roll to prevent collision.
Lubrication management ‌ : Select the specified type of lubricating oil according to the requirements of the equipment manual, monitor the bearing, gear box oil level and oil temperature, and replace the hydraulic oil every 500 hours.
Drive system ‌ : Check the vibration and abnormal sound of the motor and reducer daily, and the belt tension deviation shall not exceed ±5%.
Preventive maintenance strategy ‌
Set up the equipment site inspection ledger, check the pressure stability of the hydraulic system weekly, and check the leakage of pipelines.
Precision calibration is performed quarterly, including roll parallelism (error ≤0.02mm/m) and roll gap symmetry.
Third, process parameter control: to ensure product quality
Core parameter setting principles ‌
Reduction control ‌ : dynamically adjust according to the yield strength of the material, such as low carbon steel single pass reduction should not exceed 40% to prevent mill overload.
Tension matching ‌ : the inlet and outlet tension ratio should be kept at 1:1.2~1.5 to avoid strip deviation or fracture.
Rolling speed ‌ : at the initial stage, the material is bitten at a low speed (≤30m/min), and the speed is gradually increased to the required value after stability.
Real-time monitoring and adjustment ‌
The on-line thickness gauge is used to monitor the plate tolerance (such as ±0.05mm), and the roll gap is adjusted when it is out of range.
Surface quality inspection should be conducted every 30 minutes, and any defects such as roll marks and vibration marks should be stopped immediately to check roll status.
Iv. Emergency handling and personnel training
The exception handling process is ‌
Card material handling ‌ : immediately press the emergency stop button, manually reverse the exit material, it is strictly prohibited to pull.
Sudden shutdown ‌ : Check the status of the overload protector after the power is cut off. Do not restart the device before troubleshooting.
Skills enhancement mechanism ‌
Operators need to hold the "rolling equipment Operation Certificate" to work, every six months to participate in safety training and practical operation assessment.
The simulation operating system is introduced for fault drill, and the response ability to the sudden situation such as broken tape and rolling is improved.
Conclusion
Standardized operation process and fine equipment management are the basis of efficient operation of cold rolling mill. By strictly implementing safety procedures, accurately controlling process parameters, and implementing preventive maintenance, companies can significantly reduce the failure rate, increase the product qualification rate to more than 98%, and extend the service life of the equipment by 3-5 years. Only by improving technical standards and personnel quality simultaneously, can we achieve the dual goals of production efficiency and safety protection.
This paper is suitable for the reference of the managers, operators and equipment engineers of the rolling workshop, and it is suggested to refine the implementation standards according to the specific working conditions of enterprises.