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Introduction to the Development of Rolling Mills

Introduction to the Development of Rolling Mills

Introduction to Roll Development: The main working parts and tools used for the continuous plastic deformation of metals on rolling mills. Rolls are mainly composed of three parts: roll body, roll neck, and shaft head. The roll body is the middle part of the roll, which is actually involved in rolling metals. It has a smooth cylindrical or grooved surface. The roll neck is mounted in the bearing, and the roll force is transmitted to the frame through the bearing seat and clamping device. The drive end shaft head is connected to the gear seat through a connecting shaft, transmitting the rotating torque of the motor to the roll. Rolls can be arranged in the form of two rolls, three rolls, four rolls, or multiple rolls in the mill frame. With the development of metallurgical technology and rolling equipment, the varieties and manufacturing processes of rolls are also constantly developing. In the Middle Ages, low-strength gray cast iron rolls were used to roll soft non-ferrous metals. In the mid-18th century, Britain mastered the technology of producing cold cast iron rolls, which were used to roll steel plates. In the second half of the 19th century, the advancement of European steelmaking technology required the rolling of larger ingots. Neither gray cast iron rolls nor cold-hard cast iron rolls could meet the requirements in terms of strength. This led to the birth of ordinary cast steel rolls with a carbon content of 0.4% ~ 0.6%. The emergence of large forging equipment further improved the strength and toughness of forged rolls of this composition. At the beginning of the 20th century, the use of alloying elements

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The role of rolls in a rolling mill production line!

The role of rolls in a rolling mill production line!

The role of rolls in rolling mill production lines! Rolling mills include main equipment, auxiliary equipment, lifting and transportation equipment, and auxiliary equipment, each of which is very important and indispensable. A rolling mill is a machine that rolls steel between rotating rolls. It is said that steel mills appeared in Europe in the 14th century. Continuous, automated, specialized, high-quality, and low-consumption are the development trends of modern rolling mills. The rolling mill's working frame is used to install the frame and is fixed to the foundation, also known as the floor. It bears the weight of the working frame and the tilting moment, while ensuring the accuracy of the working frame installation dimensions. So, what does the work of a rolling mill include? The main equipment of a rolling mill is the working frame and the transmission device. The machine body consists of rolls, roll bearings, frames, guide seats, roll adjusting devices, upper roll balancing devices, and roll changing devices. Rolls are an important part of the rolls in a steel mill. It uses the pressure generated by a pair or a set of rolls to roll steel. It mainly withstands the effects of rolling dynamic and static loads, wear, and temperature changes. Rolls are divided into hot rolls and cold rolls. The role of rolls in rolling mill production lines is to crush. For example, using a steel mill to roll a 3mm thick steel plate to 0.5mm thick. The roll materials are very different under different working conditions. In general, it uses materials with high hardness, high strength, and small deformation. In

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Classification of rolls

Classification of rolls

Roll Classification There are several ways to classify rolls. The main methods are: (1) By product type: strip rolls, section rolls, wire rolls, etc. (2) By position in the rolling mill: roughing rolls, intermediate rolls, finishing rolls, etc. (3) By roll function: descaling rolls, piercing rolls, leveling rolls, etc. (4) By roll material: steel rolls, cast iron rolls, cemented carbide rolls, ceramic rolls, etc. (5) By manufacturing method: cast rolls, forged rolls, weld-deposited rolls, inlaid rolls, etc. (6) By the state of the rolled steel: hot rolls and cold rolls. Various categories can be combined to give rolls a clearer meaning, such as a high-chromium cast iron work roll for hot rolling strip steel. Common 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 microstructure, physical and mechanical properties, and the type of residual stress inside the roll (see Roll Inspection). The performance of a roll in a rolling mill depends not only on the material and metallurgical quality of the roll, but also on the operating conditions, roll design, and maintenance. Different types of rolling mills have very different rolling conditions. Factors causing these differences include: (1) Mill conditions. Such as mill type, rolling

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Roller ring installation and usage precautions

Roller ring installation and usage precautions

I. Roller Ring Installation and Use Precautions The installation of cemented carbide roller rings should pay attention to the following points: 1. The roller ring machine should strictly check the roller ring dimensions according to the process design requirements. To ensure that the roller rings of the same batch are suitable for the same batch, use roller rings of the same brand, and the matching roller ring materials, performance, and density should be consistent. Any differences will affect the dynamic balance and the use effect of the roller ring. 2. Roller ring installation, roller ring. The matching surfaces between the roller shaft and the roller cone sleeve and the sleeve should be kept clean, and the matching parts should be kept neat and reasonable. The assembly should not be too tight or too loose. If the assembly is too tight, the rolling temperature will increase. At this time, the supporting roller ring is in a state of large tensile stress. Once the rolling force fluctuates, it will cause radial cracking of the supporting roller ring, resulting in the cracking and scrapping of the supporting roller ring. If the combination is too loose, the roller ring and the roller shaft will slide relatively, generating frictional heat, causing thermal stress in the roller ring, and cracks. In severe cases, the roller ring and the roller shaft cone sleeve will be scrapped. Therefore, the roller ring installation pressure should be strictly controlled. 3. The roller ring is a brittle material. It is heavy and easily damaged. Therefore, during the installation, transportation, and handling of the roller ring, collisions are strictly prohibited. II. Reasonably Determine the Rolling Volume The roller ring single groove is rolled for a certain period of time. When the rolling groove produces a

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Key points for roller ring assembly

Key points for roller ring assembly

In practical applications, many factors affect the assembly of the idler roller ring. Improper assembly operations can lead to production failures such as idler roller bursting, idler roller loosening, and cone sleeve breakage. Therefore, classifying and analyzing the factors affecting the assembly of the idler roller ring and establishing a reasonable range of idler roller loading and unloading pressure can effectively prevent accidents such as idler roller bursting, idler roller loosening, and cone sleeve breakage. Factor analysis: Based on the structure of the high-speed wire rod mill roll ring, the factors affecting its assembly are analyzed. Installation dimensions: The geometric dimensions of the roll ring, cone sleeve, roll shaft, roll changer, and roll press directly affect the assembly of the roll ring and are important factors. The roll ring uses WC material, with a HRC hardness of 83, which is a highly wear-resistant material. The roller ring center hole is in contact with the outer ring of the cone sleeve, so the tolerance of the fit between the roller ring center hole and the cone sleeve is a very critical parameter. The inner circle of the cone sleeve is in direct contact with the roll shaft, using an interference fit. The taper of the inner circle of the cone sleeve should be consistent with the taper of the roller shaft and should not exceed the tolerance range. Otherwise, the contact area between the inner circle of the cone sleeve and the roller shaft will be affected, and the contact area should be greater than 70%. The roll puller and roll press of the roll changer cooperate with the four ears of the cone sleeve to complete the roll loading and unloading through the set pressure value. The dimensions of the roll machine and roll press cooperate with the ears of the cone sleeve.

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Introduction to roll rings

Introduction to roll rings

Roll rings are parts of the shaped roll body between or outside the grooves. The end roll rings located at both ends of the roller body can prevent oxide flakes from falling into the bearings; the intermediate roll rings located between two adjacent channels are mainly used to separate the channels and withstand lateral pressure. The basic parameters of the roll ring are the roll ring height and the roll ring width. The height of the roll ring is the depth of the groove. When determining the width of the intermediate roll ring, the strength of the roll ring and the convenience of installation and adjustment of the guide device are mainly considered. The end roll rings located at both ends of the roller body can prevent oxide flakes from falling into the bearings; the intermediate roll rings located between two adjacent channels are mainly used to separate the channels and withstand lateral pressure. The basic parameters of the roll ring are the roll ring height and the roll ring width. The height of the roll ring is the depth of the groove. When determining the width of the intermediate roll ring, the strength of the roll ring and the convenience of installation and adjustment of the guide device are mainly considered. The strength of the ring depends on the material of the roll and the depth of the groove. The width of the intermediate roll ring in the open channel of the cast iron roll is generally equal to the depth of the groove in the deepest part of the two adjacent channels. For steel rolls or short rolls, it can be appropriately reduced. In closed rolls, when the roll material is cast steel, the roll ring width can reach 0.8~1.0 times the groove depth, and the cast iron roll can reach 1.2~1.5 times the groove depth. When selecting the width of the support ring,

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Sharing related content about roll bearings

Sharing related content about roll bearings

Roll Bearing Maintenance Roll bearings need to be periodically removed from the rolling mill for inspection and maintenance to improve the service life of the roller bearings. The frequency of bearing maintenance should be adjusted according to the operation of the rolling mill, mainly based on experience. The usual maintenance frequency is once every three months under full load operation, most rolling mills once every six months, and light rolling mills once in December each year. After the first 1000 hours of operation, the roller bearings should be disassembled and inspected. During operation, it is necessary to clean the bearings and check the seals. If necessary, the seals should be completely replaced. If no abnormalities are found, the interval of the second inspection can be extended. General steps for roll bearing maintenance: 1. Track and record the location of the bearings in the rolling mill. It is recommended to use a special record card for roller bearing maintenance services. Also note that special lifting methods and tools are required when removing bearings from the bearing housing or inspecting bearings. 2. Clean the bearings. During the cleaning process, remove all debris, water, residual lubricant, and any other dirt that could cause serious wear and tear on the bearings. 3. Inspect the bearings, including visual inspection and minor repairs. Pay attention to inspecting and repairing the bearing housing, and reinstall the bearings in the bearing housing as needed. 4. Lubricate the bearings. Existing common rolling mills are characterized by large rolling force and high rolling speed, requiring...

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