RollerIntroduction of development

Main working parts and tools for continuous plastic deformation of metals on rolling mills. The roll is mainly composed of three parts: roll body, roll neck and shaft head. The roll body is the middle part of the roll, which actually involves rolling metal. It has a smooth cylindrical or grooved surface. The roller neck is installed in the bearing, and the roller force is transmitted to the frame through the bearing seat and the pressing device. The shaft head at the transmission end is connected with the gear seat through the connecting shaft, and the rotating torque of the motor is transmitted to the roller. The rolls can be arranged in a two-roll, three-roll, four-roll or multi-roll arrangement in the roll stand.

With the development of metallurgical technology and the development of rolling equipment, the variety and manufacturing process of rolls are also developing. In the Middle Ages, low-strength gray cast iron rolls were used to roll soft non-ferrous metals. In the middle of the 18th century, Britain mastered the technology of producing cold cast iron rolls for rolling steel plates. Advances in European steelmaking technology in the second half of the 19th century required the rolling of larger tonnage ingots, whether gray cast iron rolls or chilled cast iron.RollerIts strength does not meet the requirements. The birth of the carbon content of 0.4% ~ 0.6% of the ordinary cast steel roll. The emergence of large-scale forging equipment has further improved the strength and toughness of the forging roller of this composition. At the beginning of the 20th century, the use of alloying elements and the introduction of heat treatment significantly improved the wear resistance, strength and toughness of hot and cold rolls of cast steel and forged steel. The surface quality of hot-rolled strip steel is improved by adding molybdenum to the cast iron roll. Through flushing and compound casting, the strength of the casting roll core is obviously improved.

　　RollerThe use of a large number of alloying elements began after World War II. This is the result of the development of large-scale, continuous, high-speed, and automated roll equipment. It is also the result of higher requirements for roll performance after rolling strength and deformation resistance. During this period, semi-steel rolls and ductile iron rolls appeared successively. After the 1960 s, the cemented carbide powder roller was successfully developed. In the early 1970 s, centrifugal casting technology and differential heat treatment technology were widely introduced in Japan and Europe, which greatly improved the comprehensive performance of strip steel rolls. Composite high chromium cast iron rolls have also been successfully applied to hot strip mills. At the same time, Japan has adopted forged white iron and semi-steel rolls. In the 1980 s, Europe introduced high-chromium steel rolls, cold rolls for ultra-deep hardening layers, and special alloy cast iron rolls for small steel and wire finishing mills. The development of rolling technology promotes the development of high-performance rolls. The core material produced by centrifugal casting and new composite methods such as continuous casting composite method (CPC), spray deposition method (fishhook method), electroslag welding method and hot isostatic pressing method is forged steel or ductile iron with good toughness. The core material is a series of high-speed steel composite rolls and metal ceramic rolls, which have been applied to new generation profile, wire and strip rolling mills in Europe and Japan respectively.