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A Brief History of the Development of Rolls

A Brief History of the Development of Rolls

The variety and manufacturing process of rolls are constantly developing with the progress of metallurgical technology and the evolution of rolling equipment. Low strength gray cast iron rolls were used in medieval rolling of soft non-ferrous metals. In the middle of the 18th century, Britain mastered the production technology of chilled cast iron rolls for rolling steel plates. In the second half of the 19th century, the progress of European steelmaking technology required the rolling of larger tonnage ingots, and the strength of gray cast iron or chilled cast iron rolls could not meet the requirements. Carbon content of 0.4%~ 0.6% ordinary cast steel roll was born accordingly. The emergence of heavy-duty forging equipment has further improved the strength and toughness of forging rolls with this composition. The use of alloying elements and the introduction of heat treatment in the early 20th century significantly improved the wear resistance and toughness of cast and forged steel hot and cold rolls. The addition of molybdenum to cast iron rolls for hot-rolled strip improves the surface quality of the rolled material. The core strength of the casting roll is obviously improved by the compound pouring with flushing method.

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Performance requirements

Performance requirements

Generally, the main requirements for rough rolls are strength and thermal crack resistance. The working roll weight of the small 20-roll mill is only about 100 grams, while the support roll weight of the wide and heavy plate mill has exceeded 200 tons. When selecting the roll, first of all, according to the basic strength requirements of the rolling mill to the roll, select the main material for safe bearing (various levels of cast iron, cast steel or forged steel, etc.).

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Roll selection

Roll selection

The commonly used roll materials and uses are shown in the table. The performance and quality of a roll generally depend on its chemical composition and manufacturing method, and can be evaluated by its structure, physical and mechanical properties, and the type of residual stress existing in the roll (see roll inspection). The effect of the roll in the mill depends not only on the material of the roll and its metallurgical quality, but also on the conditions of use, roll design, operation and maintenance. The conditions of use of rolls of different types of mills are very different, and the factors that cause the difference are:(1) the conditions of the mill. Such as mill type, mill and roll design, pass design, water cooling conditions and bearing types, etc.;(2) rolling conditions such as rolling material varieties, specifications and their deformation resistance, pressure system and temperature system, output requirements and operation, etc.;(3) product quality and surface quality requirements.

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Roll classification

Roll classification

There are many classification methods for rolls, mainly including:(1) strip rolls, section steel rolls, wire rolls, etc. according to product types;(2) according to the position of the rolls in the rolling mill series, there are billet rolls, rough rolls, finishing rolls, etc.;(3) according to the roll function, there are scale-breaking rolls, perforated rolls, leveling rolls, etc;(4) According to the roll material, there are steel rolls, cast iron rolls, carbide rolls, ceramic rolls, etc.;(5) According to the manufacturing method, there are casting rolls, forging rolls, surfacing rolls, inlaid rolls, etc.;(6) According to the rolled steel state, there are hot rolls and cold rolls. Various classifications can be combined accordingly so that the roll has a more clear meaning, such as hot rolling strip with centrifugal casting high chromium cast iron work roll.

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Introduction to Some Related Problems of Surfacing Roller

Introduction to Some Related Problems of Surfacing Roller

Roller is the core component of rolling mill. The use of rolls involves the selection of the rolling mill, the preparation of the rolls, the maintenance and the regular trimming during the rolling process, which are all factors that affect the productivity, product quality and production economy of the rolling mill. Since the rolling process is a continuous process, the operator needs to constantly check the roll condition so that the product can meet the user's requirements for stricter tolerances and surface quality. In order to maintain the competitiveness of products, it is necessary to continuously require mill operators to reduce production costs, that is, to increase the rolling speed, increase the production flexibility of the mill, and reduce the consumption of rolls. So what should be paid attention to when surfacing roll?

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Some knowledge points of roller

Some knowledge points of roller

Cable tray equipment roller is an important part of the cable tray equipment. What are the characteristics of the design and use of the cable tray equipment roller? The design and use of the cable tray equipment roller has the following characteristics.

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High-speed steel roll ring manufacturers: what are the commonly used high-speed steel and the advantages and disadvantages of high-speed steel

High-speed steel roll ring manufacturers: what are the commonly used high-speed steel and the advantages and disadvantages of high-speed steel

High-performance high-speed steel by adjusting the basic chemical composition and adding other alloying elements, can be used to cut high-strength steel, high-temperature alloys, titanium alloys and other difficult-to-process materials, so that its performance than ordinary high-speed steel to improve a step.

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