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Roller related content sharing

Roller related content sharing

Rolling mill is the equipment to realize the metal rolling process, generally refers to the equipment to complete the whole process of rolling production. The working base is composed of a roll, a rolling mill stand, a bearing seat, a bearing, an independent coiling and uncoiling or unloading platform, a base, a roll adjusting device, an upper roll balancing device and a roll changing device. The roll is the main working part and tool for continuous plastic deformation of metal on the rolling mill, which is mainly composed of roll body, roll neck and shaft head.

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2022

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08

Development course of roll material and heat treatment process

Development course of roll material and heat treatment process

The service life of the roll mainly depends on its internal performance and working stress, and the internal performance includes strength and hardness. In order to make the roll have sufficient strength, the material of the roll should be considered. Hardness usually refers to the hardness of the working surface of the roll, which determines the wear resistance of the roll, and to a certain extent also determines the service life of the roll. Reasonable material selection and heat treatment can meet the hardness requirements of the roll. Below, the small series will bring you together to understand the development of roll materials and heat treatment processes. What many people don't know is that the cold roll bears a lot of rolling pressure during the working process, and the welding seam, inclusion, edge crack and other problems of the rolled piece are easy to lead to instantaneous high temperature, which makes the working roll crack, stick the roll and even peel off and scrap due to strong thermal impact. Therefore, the cold roll should have the ability to resist cracking and spalling caused by bending, torsion and shear stress, and should also have high wear resistance, contact fatigue strength, fracture toughness and thermal shock strength. Therefore, from the late 1970 s to the mid-1980s, domestic and foreign research began to use chromium content of 3% to 5% of the deep-hardened layer cold-rolled work roll steel. However, these steels are high-carbon and high-alloy materials with good hardness and wear resistance, but the hardened surface of the roll is brittle, the contact fatigue life is short, and the quality is unstable.

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2022

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07

How should roller bearings be maintained?

How should roller bearings be maintained?

Aluminum rolling mill rolls and roll bearings are important parts of the rolling mill. In rolling production, the roll is in direct contact with the rolling metal, resulting in plastic deformation of the metal. Therefore, the roll is the main deformation tool of the rolling mill, and the roll is supported by various bearings. The quality and service life of rolls and roll bearings are directly related to the product quality, production efficiency and production cost of the rolling mill. Therefore, the maintenance of the roller bearing is particularly important. Working characteristics of 1. roll bearings Roll bearings are used to support rolls. Compared with general bearings, roll bearings have the following characteristics: 1. Strong pressure bearing capacity. Due to the limitation of the overall size of the bearing seat, it cannot be larger than the smaller diameter of the roller body, and the length of the roll neck is shorter, and the unit load on the bearing is larger. The unit pressure of the general roller bearing is as high as 2000 ~ 4800Mpa, which is 2~5 times that of the ordinary bearing, and the PV value (the product of the unit pressure and the linear velocity) is 3~20 times that of the ordinary bearing. 2. The speed difference is large. The operating speed of different rolling mills varies greatly. For example, the export speed of modern six-stand cold rolling mill has reached 42 m/s, the export speed of high-speed wire rod mill has reached 100 m/s, and some low-speed rolling

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2022

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07

Take you to understand the material of the roll and common problems

Take you to understand the material of the roll and common problems

The roll is a tool for plastic deformation of (rolling) metal, and it is an important vulnerable part that determines the efficiency of the mill and the quality of the rolled material. Roll is an important part of the rolling mill in the rolling mill. It uses the pressure generated by a pair or a group of rolls to roll steel. It is mainly affected by the rolling process of dynamic and static load, wear and temperature changes. So, what are the characteristics and common problems of the roll? Let's look at it together.

08

2022

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06

The following is a brief talk about roll maintenance and production standards

The following is a brief talk about roll maintenance and production standards

The following is a brief talk about roll maintenance and production standards: correctly judge the number of uses. The grinding interval of high-speed steel rolls depends on the oxide film on the roll surface and the maintenance of roughness after each shutdown. Under normal circumstances, the front frame can be used 3~7 times, the rear frame can be used 2~4 times, and the high-speed steel roll can even be used more than 10 times.

25

2022

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05

What if the roll breaks?

What if the roll breaks?

What if the roll breaks? In the actual application process, the roll break is a common thing. So, do you know the specific reason why the roller breaks? Today, I will give you a detailed introduction.

09

2022

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05

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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Liaoning Yilian Sheng New Material Co., Ltd.

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