(1) The rolling guide sticks the steel;
(2) The guide wheel does not turn or the bearing burns out;
(3) The rolled piece split;
(4) The guide or the roll ring is installed incorrectly;
(5) The roll gap is not set properly or the incoming material size is not reasonable;
(6) The guide is not fastened.
16. What are the reasons for the poor wire loop of the laying head outlet?
(1) The tension between the rolling mills is too large;
(2) the alignment deviation of the water cooling section, the nozzle duct wear and corrosion cause the rolling operation to be unstable;
(3) The clamping force of the pinch roller is not appropriate due to the wear of the pinch roller ring or the failure of the cylinder link mechanism;
(4) The deviation of the bending line of the spinning tube, the spinning tube is seriously worn, and the spinning tube is sticky connected, the unbalance of the spinning tube causes the loop formation difference;
(5) Improper speed configuration of the finishing mill, pinch roll, and laying head, serious speed fluctuation of the rolling mill, causing the rolling speed to be faster or slower, resulting in uneven coil size;
(6) When the temperature of the rolled piece is high, the coil is too soft, and the coil falls on the receiving platform, and it will become an ellipse or a random circle.
17. What are the common types of damage to rolling guides in finish rolling? What are the causes? How to prevent it?
1) The guide roller bearing is broken, so the guide roller cannot rotate;
2) The guide roller is short of oil, and the bearing is locked;
3) The guide roller lacks water, causing the guide roller to not rotate or burst;
4) The guide roller shaft is broken;
5) The guide roller moves, the screw of the pin is loose;
6) The guide arm is loose.
Solutions:
1) Strictly control the size of the red billet, ensure the same size as the guide, and prevent the thickness of the material from impacting the guide roller.
2) Prevent misalignment of the roll ring, prevent twisting of the rolled piece, and the rolling guide is damaged. The bottom surface of the roll ring needs to be aligned with copper skin.
3) To prevent the roll ring from moving, due to the roll ring movement, the torsion moment is generated in the rolled piece.
4) The guide guard must be aligned to prevent excessive force on one side of the guide roller.
5) Strictly control the installation quality of the rolling guide, prevent the guide roller from moving, the guide guard arm is loose, and the cap screw is tight.
6) Strictly check whether the oil pipes and water pipes are working properly.
18. What common accidents will occur during the production of 27 high-speed roll rings with misaligned holes? How to solve it?
1) The serious slope of finished product;
2) The rolled parts are twisted, are unstable in the water-cooled channel, and are easy to get out of the waste box;
3) Due to the torsion of the rolled parts, the finished guides are easy to damage, resulting in the quality accident;
4) The guide is not easy to align.
Solution: Add copper skin to the bottom of the roller ring.
19. How to deal with the sudden stoppage of the high-speed wire mill?
1) Immediately start flying shearing machine #1, #2, and #3;
2) Emergency stop finishing and pre-finishing;
3) Notify the dispatch room to find the reason;
4) After stopping, ask an operator to the finishing mill to check the condition inside the machine;
5) Roller ring was all replaced or slowly cooled, it is strictly prohibited to cool the roller ring with water.
More Articles You May Be Interested:
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2. How to Choose Steel Rolling Mill Machine?
3. Heat Treatment Method for Steel Rolling Mill
4. Rolling Steel Pressure Processing Technology
5. Rolling Steel Production System
6. The practice of Direct Rolling without Heating
7. What Adjustment Devices Are There in the Rolling Mill?
8. What Are the Rolling Process Systems?
9. Key Factors Affecting Rolling Mill Prices
10. Should Customers Choose Used Rolling Mill?
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