我要的2500字的英语文章 Design of Continuous Hot Rolling Steel Strip Plant
Since the technology of manufacturing steel strips is so old and well-developed, the steel strips are produced in a great variety of types and sizes, and are available in both coils and spools. Hot Rolling steel strips are produced in a metalworking process by rolling the steel strips at temperatures larger than the steels recrystallization temperature (1700-2000 °C). During this process, tension is kept constant using a series of rollers and their roll gap, and the metal is continuously passed through them until the desired finished shape and size is obtained.
Continuous hot rolling steel strip plants are generally composed of a roughing mill, a finishing mill, rolling and cooling as well as a winding and control system. In the roughing mill, pre-annealed steel strip is formed, straightened, and then reduced in thickness to produce a certain size and width. The main elements of the roughing mill are: receipt, degreasing, entrance end, provisional stands, upper spindles and middle spindles, vertical and horizontal grooves, exit end, pickling, and cooling line.
The discharge end of the roughing mill is connected to the entrance end of the finishing mill. In the finishing mill, the hot rolled coil is rolled in stages with decreasing width. As the strip passes through the rolls, it is increasingly bent and twisted, which requires ever increasing tension in the winder that accompanies it. The main element of the finishing mill is composed of: entrance end, provisional stands, upper and lower spindles, vertical and semi-vertical grooves, exit end, roll cooling and roll heating etc.
After the hot rolling process, the steel strips are rolled to the desired length and edged. After edging, the strips are transported to the winding line, where the steel strips are wound into coils and then transported to the warehouse for further processing and packaging. The winding line usually consists of flying shear, entry table, traversing carriage, reeling/unreeling stands, pay-off/take-up device, table winder, roll removal station etc.
The most important part of the whole process is the control system. It is responsible for controlling the entire line, and it consists of core components such as the transmission system, motor control system, data collector, console, and other components. It is mainly responsible for the transmission and control of rolling parameters, data collection and real-time monitoring, and control of the entire production line.
In short, the continuous hot rolling steel strip plant is an important production line in metal industry, which is composed of a series of equipment and processes, including the roughing mill, finishing mill, rolling and cooling line, and winding and control system. The key features of this production line are the tight control of parameters, accurate transmission, segmental and continuous production process, which provide the production quality assurance and enhanced productivity.
