Application of CBN tool in high material centrifugal roll processing
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Introduction to the manufacture and use of Xingtai Delong Machinery Niu Xinqiang Centrifugal Roller 
Roll turning scene 
Roll Grinding Site High-material centrifugal roll processing Today, the roll processing we discuss is no longer the processing of general-purpose rolls such as ordinary high-nickel-chromium, semi-steel, alloy-cast steel, and integral alloy ductile iron. Rather, it represents the processing of high-hardness, high-wear, anti-accident high-material centrifugal rolls used in the large-scale hot strip mills of the major steel mills. They are: high-speed steel, high-chromium steel, high-chromium iron, Improved high nickel chrome roll. These are all superhard material processing and special processing. 1. Unified characteristics and processing characteristics 1) The content of Cr, Ni, Mo and other alloys is about 15%, the highest can reach 20%, and the alloy content is high. 2) The hardness of the working layer of the roll is high (HSD82~86). After heat treatment, the highest hardness of the surface of the roll can reach HSD93 before the fine addition. When cutting, the cutting edge is affected by the high temperature of cutting and severe impact. 3) Roll working layer, distributed and dispersed in the martensite matrix about 15-30% (vanadium, molybdenum, tungsten, chromium, etc.) hard, tiny, dispersed carbide, carbide microhardness 2000-3000. It has a scratching effect on the cutting edge of the tool, and the cutting edge is easy to form a gap. 4) The excellent hardness of the casting rolls, the hardness drop is small at the high cutting temperature, and the tool wear is accelerated. In short, their processing is special processing, resulting in cutting resistance is 1.5-2.5 times that of hardened steel of the same hardness, and the plunge is very poor, which is easy to cause the crescent wear of the rake face of the tool, the edge of the blade and the chipping of the tool. , belonging to super difficult processing materials. 2, the revolutionary CBN tool traditional sense of processing methods to take them is helpless, no longer have any meaning: high-speed steel tools can not be used at all, can not choose cutting parameters; carbide tools can only make do, the tool lead angle is 5 - 10°, cutting depth 3mm, workpiece rotation speed 2-3 rpm, similar to light knife processing, cutting resistance, resistance are very large, tool wear is fast, low life. The processing efficiency is very low, which is extremely devastating and wasteful for workers and equipment. After the CBN tool was introduced in the roll processing, it brought us a new idea of ​​processing, which led the revolution in roll processing. CBN tool processing method: ¢20, cutting depth 8mm, workpiece rotation speed 20 rpm, workpiece line speed 70-100m/min. It is impossible to realize the traditional method in the use of the round blade car body. 
CBN tools have the advantages of high hardness, high wear resistance, thermal stability, chemical stability, low friction coefficient, high thermal conductivity, etc., which have great selectivity in tool design. 
Our company's roll processing, after the application of CBN in recent years, after groping, the production efficiency is rapidly improved, the cutting efficiency is improved by more than 6 times, and the actual whole roll efficiency is increased by about 3 times. In short, to say that it is a revolution, the cutting method has undergone innovation, and efficiency improvement is not a traditional quantity increase, but a qualitative change, so it is called revolution. High NiCr roll: hardness 75HSD Cutting speed: 60m/min Cutting depth: 10mm Feed: 1.5-1.8mm/rad 
3, CBN tool processing differentiation CBN tools in the super-hard material processing is beyond the traditional processing, but for the specific four kinds of high-material centrifugal roll processing, each one is different. Four material texture performance comparison .jpg)
Chemical composition and hardness comparison 
Gold relative ratio (carbide form) CBN tool is tested under the conditions of four kinds of roll processing , and the cutting parameters are selected under the same conditions, as follows: 1. Experimental conditions 
2, test cutting parameters 
3. Test results and conclusions 
From the failure mode, as the hardness and strength of the four materials increase, the wear amount increases after the tool is processed, and the service life decreases in turn. After selecting another manufacturer's CBN blade, the comparison is as follows: 
Processing high nickel chromium It can be seen that the quality of Fu Nike's products is comparable to that of foreign products; there is a clear gap between CBN tools of other domestic companies and Fenike. Then, CBN tools are also improving. Recently, we have tried Fenike's F9000 products on high-chromium steel. Under the same conditions as the above test conditions, the use effect is higher than that of the previous F3500, the life expectancy is obviously increased, and the wear amount is reduced compared with the past. 
As can be seen from the above, FNC's CBN products not only bring a new era of processing to the rolls, but also lead the technological revolution, and they insist on it, always focus on this, continue to improve, and continue to innovate with the improvement of the roll material. Adapt to it, I believe it is the same in other areas. As mentioned above, we also selected suppliers at the beginning of the plant construction, but after repeated trials, the survival of the fittest, and finally selected their company. Advantages of Fenike: 1. Stable product quality and high cost performance; 2. First-class service before, during and after delivery; able to provide us with satisfactory technical support and service, and solve the versatility and use of tools. Accelerate the resolution of on-site problems and timely discover the weak links on the scene. Increase the convergence and common improvement of supply and users. Product value and service are priceless, which is the decisive factor for many years of cooperation. The technical service team led by Zhang Tai and the chief engineer can always appear when we need the most help, give us ideas, find ways, and tide over the difficulties. Hope 1. The development of new materials and new processes has brought about the rapid development of wear-resistant materials such as rolls. The field of difficult-to-machine materials will inevitably lead to the development of new tools in the direction of high hardness, high speed, high precision and dry machining. I hope that Fenike will continue to lead the development and progress of CBN tools. 2. At present, not only in the tool industry, but also in many other high-end, new technology industries, and even general competitive industries, domestic brands are greatly affected, even in a weak position. However, in the CBN tool industry, domestic brands have strong vitality and market share. I hope that Fenike can make the national enterprises in the CBN tool industry better. Xingtai Delong Machinery Profile: Delong Roll was established in 2007. It is a Singapore-listed company and is affiliated to Delong Group (Holdings) Co., Ltd., the full name of Xingtai Delong Machinery Roll Co., Ltd. The company's existing production capacity of 15,000 tons of rolls per year. The main products include hot-rolled strip mill, medium and wide plate mill, cold-rolled strip mill, large-scale steel mill, universal mill and other modern rolling mills. The main machining equipment includes 17 large lathes, 5 roll grinders and 4 boring and milling machines. The roll material mainly includes high-NiCr, high-Cr steel, high-Cr steel, high-speed steel, semi-high-speed steel, semi-steel, alloy steel and other hot-rolling work rolls; composite cast steel, integral cast steel; forged steel backup roll, forged Cr2, Cr3 Cold rolling work rolls such as Cr5. Since the establishment of Delong Roller, Fu Nike has been accompanied by the company's growth. In the past six years, it has provided great technical support and material support, which has played a very important role in promoting high-speed and efficient processing of rolls, making the company limited. The processing equipment has a huge potential to meet production and user needs.