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rolling mill defects

The different types of the rolling mill defects are expressed in below: A. Edge Wave (EWV) If rolls are elastically deflected, the rolled plates become thin along the edge, whereas at centre the thickness is higher

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  • Rolling Mill Defects | Speaking of Precision Blog

    Rolling Mill Defects | Speaking of Precision Blog

    Rolled in material may have come from some source other than the base material. If the material which is removed by shearing is not reattached, the remaining gouge in the surface may form other defects upon further rolling. Intergranular precipitates or segregation can contribute to mill shearing

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  • 1. Hot rolling and rolling defects: 1.1 Front and back

    1. Hot rolling and rolling defects: 1.1 Front and back

    1.8 Rolling defects: Mill spring is a defect in which the rolled sheet is thicker than the required thickness because, the rolls get deflected by high rolling forces. Elastic deformation of the mill takes place. If we use stiffer rolls, namely roll material of high stiffness or elastic constant, we could avoid mill spring

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  • Different types of rolling mills and defects in rolled

    Different types of rolling mills and defects in rolled

    Jun 05, 2020 1 Types of rolling mills: 1.1 Two-high rolling mills: 1.2 Three-high rolling mills: 1.3 Four high rolling mills: 1.4 Tandem rolling mills: 1.5 Cluster rolling mills: 2 Defects on rolled metals: 2.1 Wavy edges crack: 2.2 Zipper crack in the centre of the strip: 2.3 Edge crack: 2.4 Alligator crack:

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  • Common Rolling Defects and How to Combat Them

    Common Rolling Defects and How to Combat Them

    One of the most common rolling defects is the occurrence of fibers at the edge, which are longer than those at the center. This occurs when concave rolls bend leading to elastic deformations. Thickness at the center implies that the edges are more elongated

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  • Rolling Process: Working, Application, Defects

    Rolling Process: Working, Application, Defects

    There are two types of rolling defects. Those are as follows: Surface rolling defects; Internal structural rolling defects. Surface Defects: Surface defects in rolling can be categorized into following types, and those are: Internal Structural Defects: There are some types of internal

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  • (PDF) Detection and Classification of Surface Defects of

    (PDF) Detection and Classification of Surface Defects of

    defects of cold rolling mill steel. The acquired image . was enhanced by special subtractive method and the . position of defect was determined using local entropy . and morpholo gy

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  • working of rolling compression mills

    working of rolling compression mills

    1. Hot rolling and rolling defects: 1.1 Front and back ... 2019-2-4 Reducing the roll gap increases the roll pressure to p3. Gage control in multiple rolling mills is achieved through measurement of strip thickness using x-ray gage and adjusting the strip tension using feedback control system. 1.8 Rolling defects: Mill spring is a defect in which the rolled sheet is thicker than the required

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  • Plate Rolling Defects and How to Avoid Them

    Plate Rolling Defects and How to Avoid Them

    Oct 17, 2014 Plate rolling defects can be one of the biggest challenges to overcome when you are using a plate roll machine especially at the upper and lower limits of the capacity of the machine. There is camber built into the rolls to compensate for the deflection that occurs when the machine is working under load

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  • Quality Improvement in Finished Cold Rolled

    Quality Improvement in Finished Cold Rolled

    is the customer of the Hot rolling mill, Hot rolled product is the customer of Cold rolling mill and cold rolled product is the customer of the inspection department. If these customers are satisfied, external customers will automatically be satis-fied. [1] tification of Defects helps reject defected pieces and manage

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  • On line prediction of surface defects in hot bar rolling

    On line prediction of surface defects in hot bar rolling

    Sep 13, 2013 These defects form very early in the rolling mill (mostly in roughing passes) and elongate in subsequent passes as the bar is being rolled. They are usually located at a certain angle to the parting line and are symmetric across the parting line (Fig. 8 )

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  • Defect control of work roll edges, roll technology

    Defect control of work roll edges, roll technology

    During the steel rolling process, the pressure increases when the support roll and the work roll are in contact. In this case, if there is a stress concentration or an excessive instantaneous stress at the edge of the roll, micro cracks may appear, leading to edge defects

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  • Cold rolling shape defects of stainless steel wide strips

    Cold rolling shape defects of stainless steel wide strips

    Abstract—when cold rolling stainless steel wide strips, some flatness defects can occur. A flat strip means that when lying on a flat horizontal surface the strip touches the surface at every point. Flatness defects cause shifting, strip breakage, and axial forces. The direct consequences are

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  • Metallurgical Processes and Defects in Steel Products

    Metallurgical Processes and Defects in Steel Products

    Oct 10, 2016 Mill spring is a defect in which the rolled sheet is thicker than the required thickness because, the rolls have got deflected by high rolling forces. Elastic deformation of the mill takes place. If stiffer rolls are used, namely roll material of high stiffness or elastic constant, then mill spring can be avoided

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  • Detect and identify all periodic defects in the hot

    Detect and identify all periodic defects in the hot

    Hot Rolling. Optimized material and production costs are achieved by early detection of periodic defects in the hot rolling mill. Our inspection solution provides early and precise defect identification throughout the entire production step. This allows users to pinpoint the defect causes and correct them by replacing rollers

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  • Cold rolled sheet (roll) common defects, characteristics

    Cold rolled sheet (roll) common defects, characteristics

    Apr 17, 2019 2 Rolling steel: The residual crucible on the surface of the slab is not cleaned and remains on the steel plate after rolling. Iron oxide scale. The defects are spotted, strip-like or scaly black spots, the distribution area is not the same, and the depth of the pressing is different

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  • Full Surface Defect Detection in Hot Conditions for Steel

    Full Surface Defect Detection in Hot Conditions for Steel

    The industrial conditions make the surface of the rolling mill dirty for inspection, causing spots and marks that are difficult to differentiate from true surface defects. Likewise, based on the type of material (batch, thickness, diameter), the product’s surface can greatly vary in appearance, so the system must adapt

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  • A BASIC UNDERSTANDING OF THE MECHANICS OF

    A BASIC UNDERSTANDING OF THE MECHANICS OF

    severe rolling accidents, due to faults by operators, weak rolled materials with internal defects, or because of other problems in a mill such as a power cut, mechanical problems of transportation or in the water

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