The development of slab continuous casting technology has played a positive role in promoting the application of a large number of large slab continuous casting machines. However, machines are man-made after all. In actual application, as time goes by, the frequency and types of various failures of the machines will increase. If the failures that accumulate over time are not prevented and repaired, the slab continuous casting operation will have many adverse effects on the manpower and material resources required for the technology. It will also slow down the improvement of product quality to a certain extent. It is more harmful than beneficial to the entire process technology. Therefore, it is necessary to analyze and explain the frequent failures of slab continuous casting machines in a targeted and timely manner.
1. Introduction to slab continuous casting machine
1) Operation of slab continuous casting machine
The operation of slab continuous casting machine is now mostly used in steel casting, which is a technology that can operate efficiently in the steel casting industry. During the continuous casting of steel, the metal is first placed in a smelting machine and treated at high temperatures to melt it. Then the melted steel and other metals are poured into the copper mould tube of the continuous casting machine. After the solidification process of the copper mould tube, the finished casting can be produced. Finally, the casting is taken out of the tube, and the continuous casting of the metal is completed.
The slab continuous casting technology has greatly improved the effective utilization rate of metals such as steel, while shortening the time of metal casting, avoiding the loss of raw materials in metal casting, and controlling the cost of manpower and material resources. Therefore, the slab continuous casting operation can be said to have brought good news to the steel casting industry and accelerated the rapid development of the smelting of metals such as steel.
In the smelting industry of steel and other metals, the slab continuous casting technology can cast castings of specific lengths and materials within a specified time. It can reduce production consumption costs and time spent in the continuous casting metal industry, produce a variety of castings, meet many metal casting requirements, and improve the success rate of metal casting. The gradually realized automatic integrated continuous casting also makes the process of metal continuous casting operation more perfect.
2) Common faults of slab continuous casting machine.
The normal operation of slab continuous casting machine requires the effective cooperation of various parts in the machine. Therefore, in the metal slab casting operation, the faults that often occur are mostly concentrated in the more important parts.
Common parts of the slab continuous casting machine that fail include the ladle turntable, the middle ladle car, the copper mould tube, the segment and the billet discharge equipment.
The faults of the ladle turntable of the slab continuous casting machine are mostly the rotary distributor, the slide plate structure and other problems.
In the rotary distributor part, it is common to have oil leakage at the joint of the outer cylinder wall of the machine, which will occur after a long time of use. The slide plate structure often cannot be closed. In the slab continuous casting operation, the temperature is relatively high, and the metal treated at high temperatures also has a lot of radiation, which will cause some damage to the machine. The pressure regulating structure of the slab continuous casting machine sometimes often fails to work properly.
The tundish car part of the slab continuous casting machine is controlled by hydraulic pressure. This part mainly has the function of baking the castings. The common problem is that the baking device cannot be opened and closed normally, which will delay the baking process of the castings, thus bringing adverse effects to the slab continuous casting.
The copper mould tube of the slab continuous casting machine is an important part of the continuous casting machine. It has many functions in the continuous casting operation of metals, such as detecting the position of the liquid and predicting liquid leakage. Therefore, the crystallizer will also have problems such as wear and inaccurate detection and control due to a long time.
The fan-shaped section of the slab continuous casting machine often has the same oil leakage problem as the rotary distributor. The billet discharging equipment also often has problems such as inaccurate control and inability to remove castings normally.
2. Common fault maintenance methods for slab continuous casting machines.
The maintenance measures taken for the frequent faults of the large ladle turntable of the slab continuous casting machine are as follows.
In the oil leakage problem of the rotary distributor, the cause of the oil leakage is analyzed, and most of them are related to the sealing material used in the rotary distributor. The reason for the oil leakage of the rotary distributor is that most of the materials used have good wear resistance, but also have high strength and high hardness. After long-term use, these materials will easily cause a large degree of mandrel wear and oil leakage. Therefore, for these, we should replace them with materials with better wear resistance and replace them regularly. This requires that the mandrel of this material is relatively easy to disassemble and low in cost, so as to ensure regular replacement and normal operation.
The welding position of the rotary distributor also needs to be regularly checked and consolidated to ensure that the welding position is firm.
For the problem of the failure of the tundish car of the slab continuous casting machine to open and close normally, because the current size of the roaster is different during use, the current size is appropriately increased, and the appropriate position of the tundish car is added The ball valve can effectively improve the problem of opening and closing failure.
For the crystallizer failure of the slab continuous casting machine, it is necessary to regularly inspect the copper plate of the crystallizer and ensure the quality of the materials used. The residues left by the metal continuous casting should be handled in time to ensure the cleanliness of the crystallizer and replace some structural parts of the crystallizer such as springs regularly. This requires the filter in the crystallizer to work effectively, so it is necessary to regularly replace the small parts in these machines to ensure the normal operation of the slab continuous casting machine.
In the operation of the slab continuous casting machine, the failure of the fan-shaped segment can also be avoided by regularly replacing new hydraulic valves and other parts to prevent oil leakage. For the failure of the billet discharge equipment to operate normally, it is necessary to regularly reinforce the pipe clamps and valves. After each high-temperature operation, appropriate cooling treatment should be carried out and regular inspections should be carried out.
In addition to these fault maintenance methods, it is also necessary to regularly lubricate the parts of the machine. After each continuous casting work is completed, the machine should be cooled for a certain period of time, which can effectively reduce machine wear and reduce the occurrence of faults.
3. Conclusion
With the rapid development of the smelting and casting industry of metals such as steel, the technical operation of slab continuous casting machines used in the casting industry has made deeper progress and higher requirements. Therefore, the common faults in slab continuous casting machines need to be taken seriously and more effective solutions should be taken to improve the production efficiency of the metal industry, reduce production costs, and make more effective and reasonable use of metal resources. Therefore, the development of the metal industry and the fault maintenance of slab continuous casting machines need to be jointly advanced and developed in the future.
