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What should I do if a roll breaks?

What should I do if a roll breaks?

What should I do if a roll breaks? Roll breakage is common in practical applications. So, do you know the specific reasons for roll breakage? Today, I will give you a detailed introduction.

09

2022

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05

A Brief History of Roll Development

A Brief History of Roll Development

The types and manufacturing processes of rolls have continuously developed with the advancement of metallurgical technology and the evolution of rolling equipment. In the Middle Ages, low-strength gray cast iron rolls were used when rolling soft non-ferrous metals. In the mid-18th century, Britain mastered the production technology of cold-hard cast iron rolls used for rolling steel plates. In the second half of the 19th century, the advancement of steelmaking technology in Europe required the rolling of larger tonnage steel ingots, and the strength of both gray cast iron and cold-hard cast iron rolls could no longer meet the requirements. Ordinary cast steel rolls with a carbon content of 0.4%~0.6% were correspondingly born. The emergence of heavy forging equipment further improved the toughness and strength of forged rolls of this composition. In the early 20th century, the use of alloying elements and the introduction of heat treatment significantly improved the wear resistance and toughness of cast steel and forged steel hot and cold rolling rolls. The addition of molybdenum to cast iron rolls used for hot-rolled plates and strips improved the surface quality of the rolled material. The flushing method composite casting significantly improved the core strength of cast rolls.

06

2022

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05

Performance requirements

Performance requirements

Generally, the main requirements for roughing rolls are strength and resistance to thermal cracking; the working rolls of a small 20-roll mill weigh only about 100 grams, while the supporting rolls of a wide and thick plate mill weigh over 200 tons. When selecting rolls, the main material (various grades of cast iron, cast steel, or forged steel, etc.) with safe load-bearing capacity is first selected based on the basic strength requirements of the rolling mill for the rolls.

02

2022

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05

Roll selection

Roll selection

Common roll materials and uses are shown in the table. Roll performance and quality generally depend on its chemical composition and manufacturing method and can be evaluated by its microstructure, physical and mechanical properties, and the type of residual stress present inside the roll (see roll inspection). The performance of rolls in a rolling mill depends not only on the roll material and its metallurgical quality, but also on the operating conditions, roll design, and operation and maintenance. The operating conditions of rolls in different types of rolling mills vary greatly. The factors causing these differences are: (1) Mill conditions. Such as mill type, mill and roll design, roll pass design, water cooling conditions, and bearing types, etc.; (2) Rolling conditions such as the type and specifications of the rolled material and its deformation resistance, reduction schedule and temperature regime, production requirements and operation, etc.; (3) Requirements for product quality and surface quality, etc.

28

2022

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04

Roll classification

Roll classification

There are various methods for classifying rolls, mainly including: (1) Classification by product type: strip rolls, section rolls, wire rolls, etc.; (2) Classification by position in the rolling mill series: roughing rolls, intermediate rolls, finishing rolls, etc.; (3) Classification by roll function: descaling rolls, piercing rolls, leveling rolls, etc.; (4) Classification by roll material: steel rolls, cast iron rolls, cemented carbide rolls, ceramic rolls, etc.; (5) Classification by manufacturing method: cast rolls, forged rolls, weld-clad rolls, inserted rolls, etc.; (6) Classification by the state of the rolled steel: hot rolls, cold rolls. Various classifications can be combined to give rolls a more specific meaning, such as high-chromium cast iron work rolls for hot-rolled strip steel produced by centrifugal casting.

26

2022

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04

Introduction to some relevant issues of overlay welding rolls

Introduction to some relevant issues of overlay welding rolls

Rollers are the core components of a rolling mill. The use of rollers involves rolling mill selection, roller preparation, maintenance, and periodic dressing during the rolling process. These are all factors that affect the rolling mill's productivity, product quality, and economic efficiency. Because the rolling process is continuous, operators need to constantly check the condition of the rollers to ensure that the products meet the user's requirements for stricter tolerances and surface quality. To maintain product competitiveness, it is necessary to constantly require rolling mill operators to reduce production costs, i.e., increase rolling speed, increase the production flexibility of the rolling mill, and reduce roller consumption. So what should be paid attention to when overlay welding rollers?

21

2022

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04

Some knowledge points about rolling mills

Some knowledge points about rolling mills

Cable tray rollers are an important component of cable tray equipment. What are the design and usage characteristics of cable tray rollers? The design and use of cable tray rollers have the following characteristics.

20

2022

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04

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