文献翻译-集成张力水平系统在连续轧制线的应用

附录AIntegrating Tension Leveling Systems into ContinuousProcessing LinesThe demand for higher quality has required all participants in the manufactureing sequence to improve their product. Flat rolled metal finishers have looked to shape improvement., via tension leveling ,as a means to achieve this goal. The issues of equipment location and integration , leveler and bridle configurations, drive system options and drive controls are considerations that must be addressed.The incorporation of tension leveling into a continuous processing line requires a decision as to its primary purpose. The priority of the criteria, ie, improved shape, improved processing or both , determines its location in the line.If final shape is the only criterion, the leveling equipment should be located in either the process or delivery section is undesirable. However, this location does have the advantages of minimal chance of material damage before recoiling and it is unnecessary to increase accumulator and exit bridle roll diameters. Both locations have the advantage of processing clean material but there is the disadvantage of possible pick up (in the case of coating lines) on the bridle and leveler rolls.In the case of process lines with planting or coating units, it is necessary to insure that the finish will not be affected by the elongation produced by the leveling process.For improved processing, the tension leveler is located in either the entry section or the beginning of the process section before or after cleaning. The entry section location has the advantage of allowing a leveler roll change during a coil change but there is the disadvantage of tension transient from stopping and jogging. The process section after the cleaning unit location has the advantage eliminating dirt contamination on the bridle and leveler rolls. In addition, it may reduce the number of bridle rolls and eliminate the need for a collection system for the oil squeezed fromthe strip by the leveler rolls.Almost all of the systems installed in tinning, pickling and electrogalvanizing lines have been located in the beginning of the process section. Hot dip galvanizing lines have units after coating with an equal number in the process or delivery section. In annealing lines, the units have been located in the delivery section, while paint lines have them in the entry section.ConfigurationOnce the location is determined, the system can be configured. The configuration include:Leveler configuration(manufacturer).Leveler work roll diameter(manufacturer).Leveler module configuration(manufacturer).Bridle roll size(manufacturer or user).Bridle roll covering(manufacturer or user).Driver configuration(manufacturer or user).Driver integration(manufacturer).The leveler configuration and module design vary with the type of material and location of the leveler in the process line. Essentially, the leveler consists of four or more work roll modules and a curvature correction (crossbow) module .The size and number of work rolls is a function of material thickness range, yield strengths, line speed, elongation and tension constraints. Work roll diameter is determined by the highest yield strength at the minimum thickness (maximum diameter) and the maximum thickness (minimum diameter) for type of materials to be processed.Leveler modulesWork roll diameters are small; therefore, support structures are required to provide rigidity. For ease of maintenance, work rolls and their backup systems are configured into removable modules. The modules are configured to provide the work roll rigiditywithout restricting the angle of wrap. The most common module configurations are:1. Work roll supported by two large diameter full-faced backup rolls.2. Work roll supported by small diameter segmented backup rolls.3.Work roll supported by two medium diameter full-faced backup rollssupported by three rows of segmented backup rolls.4. Work roll supported by two medium to relatively large diameter full-facedbackup rolls, each supported by two narrow-faced rolls.Modules employing segmented or narrow-faced backup rolls do not use automatic lubrication system because of the possibility of contaminating the strip. this type of module requires planned maintemance base on footage processed due to the lied amount of pre-lubrication.Measures taken to extend module life are a function of the type of line and location of the leveler in the line the leveler’s work rolls may be chrome plated to prevent pickup and/or rusting. The backup rolls may be grooved to remove contaminants and coated to extend life and/or prevent rust.Resultvia tension leveling is an important facility in the producing line of steel’s hot-rolling. The via tension leveling should provide qualified billets gratifying the request of the rolling process. A great deal of research work has been done to reduce the energy consumption of the via tension leveling. Some useful achievements were presented in the literature, including the optimal setting method and combustion control for the reheating furnace. However, up to now the reheating process and the rolling process have been controlled separately, which can not bring along the optimizing of the total energy consumption of the hot-rolling process, the facility usage and the production quality, although the optimizing of the energy consumption of the reheating furnace were considered by several control methods. In order to reduce the total energy consumption of the reheating process and the rolling process, and to decreaseproducing accidents at the same time, this paper presents a new object-oriented integrated optimal control strategy of the hot-rolling process based on the modeling of reheating process with rolling process cooperatively, which provides a better solution to the above-mentioned problem. The billet temperature is an important parameter that connects the reheating process and the rolling process, and this paper establishes a mathematical model of the variety of the billet temperature using mechanism analysis and discrete state space method. The mathematical model establishes the stable foundation for the integrated optimal control of the reheating process and reheating process. The issues of reheating furnace temperature optimal setting and combustion control method design are important to achieve the integrated optimal control of the reheating process and the rolling process. This paper analyzes deeply the question of how to determine and optimize the objective function in the tension leveling setting, and improves the existing method to make the via tension leveling setting accord with the aim of producing process better. Also, this paper presents a new combustion control method by means of the optimizing of air-fuel ratio, which is realized by combining the feedforward of fuel analysis with feedback of surviving oxygen analysis. In order to solve the question of furnace temperature optimizing on line, this paper presents an integrated optimal control strategy of the hot-rolling process based on the abstraction of fuzzy rule and neural network. This strategy can feed the production information of the rolling process back to the reheating process in time, and can give the presetting value of the furnace temperature corresponding dynamic compensation. In order to apply the integrated optimal control method for the hot-rolling process, this paper establishes a via tension leveling -feedback-oriented and rolling-load-feedback-oriented integrated optimal control model respectively and simulation results are given to demonstrate the effectiveness of the scheme.附录B集成张力水平系统在连续轧制线的应用关于较高的质量的要求已在制造的序列中要求所有参与者改进他们的产品。