Steel tube mill use and maintenance
In order to strengthen the effective management of equipment, improve equipment utilization, ensure production efficiency and steadily improve the quality of products; reduce the damage caused by improper operation of equipment or maintenance is not timely. Specially formulated this system.
First, the operation points:
1) Before operation, carefully check the equipment condition is normal, with particular attention to the rolling mill movement parts of the situation with or without anomalies, the various parts of the oil eye enough lubricant.
2), According to the production task list of technical requirements and specifications of materials, choose the appropriate rolling mill products and equipment to match.
3) In the rolling process according to process requirements, the reduction of each pass must be carried out in accordance with the provisions of the appropriate pressure. The first pass times the amount of pressure should be controlled in accordance with the different material hardness within a reasonable range, followed by the last 50% of the amount of pressure reduction by the amount.
4) Pressing should be based on the principle of static pressure, dynamic pressure supplement, static pressure time can not exceed 3 minutes to prevent damage to equipment; mill work should comply with the main technical parameters of the device does not allow overload operation.
5), due to process requirements need to adjust the screw down, both sides of the adjustment must be equal, so as not to affect the quality of products; such as: Scythe strip bending and so on.
6), according to the thickness of processed products is inconsistent, the thickness of the current product should be based on the appropriate adjustment of the former force to ensure the flatness of the product.
7), the operator is not allowed to leave the job in the mill work, should pay attention to the strip into the roll, whether there is winding phenomenon, such as the occurrence of rolling should stop immediately to prevent double-rolled steel strip, to prevent safety, equipment accidents occur.
8), carefully check the product and the use of the pressure plate canvas, tarpaulin and other debris on the cleaning cloth, so as to avoid the roller surface serious wear and tear. If the work roll appears this phenomenon, immediately change the work roll so as not to damage the surface of the backup roll.
9). Carry out the next production according to the task requirements. During the roll changing, take an empty car for 2-3 minutes, and press the screw evenly and slowly to preheat the roll. Conducive to roll life and usage.
10), the rolling strip in case of tear or drill into the neck, the hand can not pull, should be stopped after the wire pliers out, the use of cloth clip, the steel strip to be placed on the back of the hand to prevent the Hands rolling in to avoid accidents caused by work-related accidents; stop the screw must be loosened to avoid damage to equipment.
Second, the failure causes:
1), cracks: roll crack is mainly due to the local pressure roller is too large or hot roll caused by rapid cooling;
2), peel off: because the roll cracks continue to use the crack growth, it will Gradually form flaky or peeled, slight problems can be resumed after grinding can be used, leading to serious scrapped.
3) Draw pit: The draw pit is mainly due to the weld of the steel strip or other debris entering the rolling mill so that the roll face is drawn into pits of different shapes. In general, the pit must be changed for roll. When the steel strip enters the roll, it must lift the roll and can not continue to press it down to prevent the roll from scratching.
4), sticky roller: The main reason is sticky roller partial reduction is too large, broken pieces, broken edge, etc., generally slightly sticky rollers can be restored after use by roller surface grinding, but this roller can not be used for high-grade product processing .
5) Roller: Roller Roller is mainly caused by excessive reduction of heavy skin or slight damage to the steel belt and the resulting deviation caused by heavy skin, roller serious roll when the resulting roll, the strip will be rolling ; Le roller slightly when the strip and roll have Le India. 6), broken roller: back-up roll off the main reasons are overpressure (rolling pressure is too large), the internal roll defects (non-metallic inclusions bubbles, etc.) and the rolling temperature stress is too large.
Third, lubrication and maintenance:
1), rack liner twice per class, 20 # oil;
2),depress the stud twice per class, 20 # oil;
3),universal joint twice per shift, 20 # oil;
4),Rewinding studs, support frame for each secondary, 20 # oil;
5), put the reel, the drive shaft, bearing secondary every shift, 20 # oil;
6), the screw box, bearing seat once a week, 20 # oil;
7), the gear box every 2-3 months, 3 # lithium-based lubricants;
8), gear box once every three months, gear oil 220 #;
9),Once, the gear oil 220 # 320 #;
10), check the hydraulic system every 2-3 weeks refueling, HJ46 # hydraulic oil.
Fourth, the basic maintenance operator:
1), in strict accordance with operating procedures and mill operation requirements for operation and operation.
2) The equipment shall be repaired according to the above provisions. When the wearing parts are not in conformity with the requirements, they shall be reported to the metalworker for replacement in time.
3) The equipment is lubricated according to the lubrication and maintenance regulations, adding the corresponding oil and replacing the new oil.
4) During handover, strictly inspect the equipment after using the machine for work, and if there is an abnormal phenomenon, report to the supervisor on duty for reasons and find that the coupling is tightened immediately, then refuel each lubrication point before production.