In the paper, such problems as improper shearing parameters adjustment, nonstandard replacement process of shear blades, jam of scrap edge and poor running of belt in the shearing process with circle shear of galvanizing unit in Cold Rolled Rare Earth Steel Plate Plant of Baotou Steel are mainly elaborated, which cause the normal edge trimming of production line to be incapable as required or poor edge trimming so that the improvement of first pass yield and normal delivery within delivery cycle of products with main production line are affected. In order to improve the edge trimming quality of circle shear as well as ensure continuous stable and high production, the experiment is carried out to ensure stable operations and edge trimming quality of shearing process with circle shear.

In the paper, the speed increase and strip shape optimization for producing thin strip are systematically studied aiming at such problems as low rolling speed as well as prominent shape defects of single-side wave and composite wave in the production of 0.7~1.0 mm thin strip with UCM(universal crown mill) of 2 030 mm pickling line tandem cold mill in Baotou Steel. The internal relations between speed increase and shape defects of thin strip are revealed by analyzing the characteristics of bending roll control for UCM and establishing mathematical model of roll series-strip steel coupling for strip shape control. The strategy of independent control for single-side bending roll is developed as well as the human-computer interaction interface and compensation handler of roll bending force are designed so that the risk of sudden change of strip shape is reduced by the mechanism of integral constraint. Meanwhile, the staged plan of speed increase is formulated as well as collaborative optimization of tension parameters and cooling regime is carried out. The industrial application results showed that the speed of rolling thin strip was increased by 18%, accuracy of strip shape was controlled at 8 I~20 I and hit rate of strip shape was increased to 98.5% after the optimization so that the problems of off tracking and shut-down in furnace area of subsequent process were completely solved. This study could provide the technical support for efficient and stable productions of thin strip with UCM, which is of great significances for improving the quality of such high-end products as automotive sheets.

In this paper, it starts with the microscopic surface topography of roll. The effects and change rules of it on PC value on surface of roll are studied through processing principles and control means of such processes as roll grinding and texturing. The mathematical models of roughness and PC value, texturing times and PC value as well as such parameters as texturing gap, current and PC value are established based on the experimental data of Sarclad electro discharge texturing machine for final forming process to study their influencing rules. Finally, the optimal countermeasures for increasing PC value are selected based on actual industrial productions. After the overall process and parameters are adjusted, the PC value on surface of roll is increased and surface quality of product is improved.

Automatic surface quality tester is the system for online automatic inspection of surface quality of strip steel, the manual inspection is replaced with high-precision camera and computer image algorithm to conduct automatic inspection of surface defects so that it plays an irreplaceable role with high efficiency and sensitivity in production line of high-end plates. During operations, the surface quality inspection of products could be interrupted by system faults and then rhythm of production with galvanizing unit and trace of product quality data in later period could be affected. In the paper, the related effective measures are introduced and analyzed so that the problem of system stability is solved. Furthermore, a set of simple, convenient and rapid judgment method for fault points are summarized, which could be as references for applications of intelligent measuring instrument.

In the paper, it is elaborated the problem that chamfer at edge of backup roll is prone to gradually wear to be disappeared during its service and grinding processes more than once on site. In early stage, the manual grinding is adopted to chamfer at edge of backup roll with angle grinder so that the processing efficiency is low, human cost is high as well as accuracy to size and shape of chamfer is difficult to be guaranteed. If they are not repaired in time, there will be crushing stress between backup roll in online use and edge of intermediate roll so that cracks are easily induced and extended further. In late stage, a type of automatic grinding equipment for chamfer at edge of backup roll is designed and developed so that the efficient and high-precision grinding of chamfer could be realized. The labour intensity of operating personnel could be reduced to guarantee operation safety and chamfer could be ensured to be uniform so that dimensional precision could meet the operating requirements.

In the paper, an implementation method of intelligent safety management system is proposed by taking the microservices architecture as support and data driving as the core combining with the national safety production regulations and construction requirements with dual prevention mechanism aiming at such problems as information isolated island, response lag and lack of closed-loop management in traditional safety management of steel enterprises. Such key competencies as dynamic identification of risks, whole-process treatment of hidden dangers, whole-process supervision of high-risk operations, integrated access of interested parties and quantitative incentives of safe behaviors are realized through unifying data standard, reconstructing business processes, integrating interfaces of multi-source system and relying on enabling of mobile terminal and closed-loop control mechanism. The actual deployment in Baotou Steel showed that the transformation of safety management from "passive response" to "active prevention" and from "experience judgment" to "data-driven decision making" was effectively promoted with the system, which could provide the feasible technical solutions and implementation paradigm for establishing digital safety system in flow type heavy industrial enterprises.

Tandem cold mill is the key equipment for high speed production of cold rolled plate and strip, the negative values of forward slip are prone to occur in production process of cold rolled hard substrate. In this paper, the problem is studied by exploring the formation mechanisms of forward slip backward and influence relations of process parameters as well as the improvement strategies are proposed based on the influencing rules of exit thickness, tension at entry and exit and friction coefficients. The experiment proved that negative values of forward slip could be effectively improved with the strategies so that the mill is forced to return to normal state.

The industry chain of large iron and steel metallurgical enterprises covers the whole process of mining, beneficiation, ironmaking, steelmaking, rolling and forming as well as there are multiple high-risk hidden dangers such as coal gas leakage, high temperature melting and toxic and harmful corrosion in every production link, so the safety equipment and facilities are the core hardware support for safety production in the enterprises. In the paper, the suitable optimization measures are put forward from such dimensionalities as management consciousness, system construction and full life cycle management based on the process characteristics of iron and steel production as well as analyzing the current situations and core problems in the management of safety equipment and facilities in this type of enterprises. It is aimed at perfecting their management system of safety equipment and facilities so as to provide practical references for safety production management in similar domestic enterprises.

In the face of a bulk of vibration signal data of gear system, fault features have been difficult to be accurately extracted and efficient fault classification could not be completed with conventional signal analysis methods. In the paper, a method of reconstruction from one-dimensional sample data to two-dimensional data is proposed aiming at the problems and the reconstructed two-dimensional data are input into the convolutional neural network (CNN) for fault feature extraction and fault classification to solve the problem of end-to-end fault diagnosis. Eventually, the high accuracy rate of 99.7% is achieved. The experimental results showed that the method of reconstructing two-dimensional data and inputting them into the CNN was suitable for fault diagnosis of gear system.

In the paper, the technical reform scheme of mandatory lubrication oil return with compressed air purging is proposed by taking original gas-liquid balanced accumulator of the system as the access point aiming at such problems as large residual quantity and more loss of lubrication oil as well as serious resource waste and lubrication oil contamination in the environment at the scene for centralized thin oil lubrication system of roll bearing for five-stand six-high tandem cold mill of Cold Rolled Rare Earth Steel Plate Plant of Baotou Steel in the process of changing roll. The recycle rate of residual lubrication oil for bearing housing could approximate 100%, purchase costs of oil products and waste oil disposal costs could be significantly reduced, working environment of roll assembly area could be improved as well as equipment maintenance efficiency and cyclic utilization rate of resources could be increased with this technical scheme, which could provide mature, feasible technical references and engineering practice examples for lubrication oil consumption control of centralized lubrication system of large bearing of the same kind as well as energy saving and cost reducing in cold rolling field of metallurgical industry.