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The operating conditions of the rolls in the rolling mill components are the most complex. Rolls are subject to residual stresses and thermal stresses in the preparation process prior to manufacture and use. When used, it is further subjected to a variety of cyclic stress effects, including bending, twisting, shearing, contact stress and thermal stress. The distribution of these stresses along the roll body is uneven and constantly changing, not only because of design factors, but also because of the wear of the rolls in use, the constant changes in temperature and roll shape. In addition, abnormal rolling conditions often occur. Improper cooling of the roll after use can also be compromised by thermal stress. Therefore, in addition to the wear of the rolls, cracks, fractures, peelings, indentations and other local damages and surface damages often occur. A good roll should have a good match between its strength, wear resistance and other various performance indicators. In this way, not only is it durable under normal rolling conditions, but it can also be less damaged when some abnormal rolling conditions occur. Therefore, when manufacturing the rolls, the metallurgical quality of the rolls must be strictly controlled or external measures should be used to enhance the bearing capacity of the rolls. Reasonable roll shape, hole type, deformation system and rolling conditions can also reduce the work load of the roller, avoid local peak stress, and extend the life of the roller. Roll consumption is determined by three factors: 1 mill, rolling material and rolling conditions, and reasonable choice of roll; 2 roll material and its manufacturing quality; 3 roll use and maintenance system.
Heavy machinery plant key production projects Ningxia Juke aluminum plate rolling mill entered the finishing stage in October. To ensure the smooth production of this project, the heavy machinery plant carefully organized and carefully arranged to successfully complete the processing tasks of the key products of the project, making Ningxia Juke aluminum plate production smoothly.
Undertaking the second task of the production task, the heavy machine will position the roll as a key assessment item in October. As early as during the National Day of the 11th, it will be carefully arranged and the organization will be able to work overtime to implement manufacturing. CNC 130 machine operators received processing tasks, in order to ensure the quality of processing, they carefully analyzed the drawings and processes, when the material of the roller is 55Cr, very hard, difficult processing, especially in the processing of splines, splines After symmetry between the four surfaces, high precision requirements, and machining difficulties such as roll attack and M24 threading, first list the optimal machining program, then calculate it repeatedly, correct it, adopt new tools boldly, and finally overcome the material hardness. Difficulties, the use of thread milling cutter threading method, to ensure the smooth processing of the roll attack M24 thread and spline processing, to avoid the size of the error and the use of taps easily break the occurrence of the situation, for the product on time to win valuable time.
On September 11th, in the Guanxi Roll Manufacturing Co., Ltd. (Yiyuan Phase 2) of Bali Metal & Electrical Industry Park, Funing County, the total investment of the project was more than RMB 40 million, and 110 thousand volts Guanxing Roller Substation 80,000. The KVA transformer achieves one-time closing and transmission of electricity, marking the trial production of Guanxing Roller Manufacturing Project.
The Guanxing Roll Manufacturing Project, with a planned total investment of 500 million yuan, is an off-site expansion and reconstruction project of Yiyuan Iron and Steel, a leading company in the iron and steel electromechanical industry in Suining County. It is also one of the major projects implemented by the county this year. At present, the factory buildings and office buildings have been completed, and all steel rolling and steelmaking equipment are ready. After the project is officially put into operation, the total production capacity will reach 700,000 tons, provide more than 300 jobs, and increase tax revenue by more than 50 million yuan, which will greatly boost the county's industrial electricity consumption. (Zhu Meifang)
Fan Yanqing, secretary of the Changzhou Municipal Committee, met with Wu Shengfu, general manager of China First Heavy Machinery Group Co., Ltd., chairman of China First Heavy Machinery Co., Ltd., and Wu Shengfu, chairman of Changzhou Huaye Roller Co., Ltd.
China Yizhong Group is one of the key state-owned enterprises managed by the Central Government. It mainly provides major sets of technical equipment, high-tech products and services for the steel, power, and energy industries. Last year, sales reached 12 billion yuan. This time, the Group has integrated the quality assets of Changzhou Huaye Hengji Roller Machinery Co., Ltd. and established a heavy group, Changzhou Huaye Roller Co., Ltd.
Fan Yanqing welcomed the frequent investment of the Yizhong Group and briefly introduced the economic and social development of Changzhou. He said that Changzhou has always been a developed city of industry and commerce, especially the rapid development of equipment manufacturing industry, which currently accounts for half of the city's total industrial output, which is mainly due to strong industrial supporting capabilities and obvious advantages in location and talent. At present, Changzhou is accelerating the transformation and upgrading, and is committed to the development of five major industries of equipment manufacturing, new energy and environmental protection, new materials, biomedicine and electronic information. As the leader in China's heavy equipment and advanced manufacturing industry, the presence of Yizhong Group will surely further optimize the industrial structure of Changzhou and drive the rapid development of Changzhou's industrial economy.
Wu Shengfu stated that the layout of the Yangtze River Delta is a long-term development strategy of Yizhong Group. Yizhong Group is very optimistic about the development momentum and development potential of Changzhou. In the future, it will continue to deepen cooperation with many upstream and downstream enterprises in Changzhou and make new contributions to Changzhou’s economic and social development.
On the same day, Yizhong Group Changzhou Huaye Roller Co., Ltd. held an unveiling ceremony. (Sun Renjie)
Source: Changzhou Daily