Continuous casting is a process in which liquid steel is poured, condensed, and cut in a continuous casting machine to directly obtain cast slabs. The molten steel is injected into the crystallizer from the ladle through the tundish, and then condenses to form a cast slab of a certain shape and thickness. Then it enters the secondary cooling zone and continues to be cooled by water spray until complete solidification. After straightening, the cast slab is cut to a fixed length and then transported to the specified place by a conveyor roller. The whole process is a continuous production process.
According to the shape and size of the cross-section of the cast billet, it can be divided into bloom billet, small billet, slab, rectangular billet, round billet and special-shaped billet. The straightening and conveying of the cast slab after condensation forming are completed by guide rollers. Since the working environment of the guide roller bearings has a high temperature and must maintain a very low speed under heavy load, and is also subject to the intrusion of moisture (water vapor), oxide scale and other debris, the continuous casting equipment The working conditions are very harsh, including high temperature, heavy load, extremely low speed, water (water vapor) and oxide scale.
To date, the proportion of dry oil lubrication used in continuous casting equipment is still high, and it is the most common lubrication method used in old continuous casting equipment. Although the lubrication effect is poor and the operating cost is high, this traditional lubrication method has not been fundamentally changed due to various reasons. Of course, price is also a factor. People often compare the prices of
oil-air lubrication systems and dry-oil lubrication systems as the main basis for whether to adopt
oil-air lubrication systems. This is very one-sided. Two completely different technologies, two completely different systems, with no comparison in terms of price. What we should compare is how much benefit will the use of oil-gas lubrication system bring compared to the use of dry oil lubrication system, including economic benefits and social benefits. Environmental factors must not be ignored, and this is precisely what people compare when choosing a lubrication system. Easy to ignore. However, with the vigorous promotion and successful application of oil-gas lubrication technology in recent years, more and more new continuous casting equipment have adopted oil-gas lubrication technology, and some have changed the dry oil lubrication of old continuous casting equipment to oil-gas lubrication. Because lubrication engineers have realized the considerable benefits that using oil and gas lubrication will bring.
Facts have proved that after continuous casting equipment adopts
oil and gas lubrication, the bearings can operate flexibly, the resistance to drawing is significantly reduced, the service life is greatly extended, the consumption of lubricating oil and water treatment costs are significantly reduced, and the operation of the equipment is reduced. cost and maintenance costs, greatly improving the on-site environment.
News