![]() Rad, Hamid Reza Bakhsheshi Monshi, Ahmad Idris, Mohd Hasbullah Kadir, Mohammed Rafiq Abdul Jafari, Hassan Premature failure analysis of forged cold back-up roll in a continuous tandem mill This paper is an update of these developments. Mill requirements for new high tech roll grades and quality lead to continuous development and improvement of the tools that will provide immediate 'go - no go' information. Users' schedule of conditions also require them to be attached to a wide range of eddy current generator and automatic computerized interpretation. These sensors must be adapted to the environment of a roll grinding machine on which they must be installed. These defects can be detected using the eddy current method, and particularly sensors specially developed for micro-defects detection. Both these cracks or softened areas must be detected as soon as they appear because of the risk of spalling, marks on the product, and mill wreck. Stress and accidental defect detection on rolling mill rollsĭuring the rolling mill process, rolls are submitted to high pressures that can lead to local decohesion or metallurgical changes. The newly established roll configuration scheme is beneficial to four-high CVC mill. The distribution of roll wear with newly designed backup roll contour is more even according to the field application data. ![]() Corresponding to the newly designed work roll contour, the backup roll end chamfer was designed considering comprehensive performance of interroll stress concentration, comprehensive work roll axial force, and strip shape control ability. The status of comprehensive work roll axial force is improved considering the rolling schedule that is beneficial to the roller bearing. Then a CVC work roll curve designing scheme was proposed and it was carried out on some cold rolling mill considering the requirement of comprehensive work roll axial force minimization. The results show that the water temperature has greater influence than the water flow to control the surface temperature of the cylinders.Īxial Force Analysis and Roll Contour Configuration of Four-High CVC Millįull Text Available In order to analyze the influence of technical parameters on work roll axial force of four-high continuous variable crown (CVC mill, the deformation analyzing model with top roll system and strip was established based on influence function method. Here it is investigated the influence of flow rate and temperature of the cooling water on the temperature distribution. The model was developed using the finite volume method for a transient two-dimensional system and allows calculating the temperature distribution of the rolling mill rolls under various conditions of service. This paper presents a computational model to simulate the thermal performance of rolling mill rolls. NUMERICAL EVALUATION OF TEMPERATURE DISTRIBUTION IN THE ROLLING MILL ROLLSįull Text Available In hot rolling processes occur changes in the profile of the rolling mill rolls (expansion and contraction and constant wear due to mechanical stress and continuous thermal cycles of heating/cooling caused by contact rolled material- working roll and the cooling system by water jets in their surface, decreasing their lifetime. Significant results have been achieved, such as: increasing of work roll change intervals, increasing of the available production time, a yield gain, a product quality improvement, less working hours needed for the roll grinding operation, etc These actions applied together have contributed to the success of HSS rolls state of the art application, and provide the Steckel Mill with a much improved performance. These are: work roll cooling improvements, systematically analyzing Eddy Current and Ultrasonic non destructive tests, mechanical adjustment of work roll crown and critically examining the rolling process. USE OF HIGH SPEED STEEL WORK ROLLS (HSS ON APERAM STECKEL MILLĭirectory of Open Access Journals (Sweden)įull Text Available This paper outlines the main actions taken to reinforce the decision to use HSS work rolls on the Aperam Steckel Mill. It was concluded that for the longer service of the roll, cementite, graphite and martensite should be balanced (as per working requirement of the mill). ![]() The microstructure is correlated with the chemical composition of shell and roll-life. In this study failure analysis of four work roll of the Hot Strip Mill is carried out. International Nuclear Information System (INIS) Metallurgical analysis of spalled work roll of hot strip mill ![]()
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