Model development of work roll wear in hot strip mill

Abstract

Abstract. This paper, based on the analysis of the main factors(specific roll force, mean roll surface temperature, irregular edge wear and contact arc length) affecting roll wear, designed a new work roll wear model, the test data shows that the model can more accurately reflect the work roll wear, can be on-line prediction of work roll wear. The roll wear curve, including constant wear and irregular edge wear, presents a box shape, and the reasons also are showed in this paper. The top roll wear and bottom roll wear in the same mill are inconsistent, and the reasons are also analysed in this paper. Results show that the construction of the work roll mathematical model accords with the general law of work roll wear and tear; it can more accurately forecast roll wear online. IntroductionIn the hot rolling, physical models for rolling mills have been intensively developed in recent years. Work roll wear not only worsens the strip shape, and also declines the performance of mills on shape control. As many factors affect work roll wear in the hot rolling and these factors influence each other, quantifying the impact of these factors on roll wear is important and difficulty [1,2]. According to a literature study presented in a PhD thesis by Meng 1994 at least 182 wear equations have been published [3]. Referring to Meng, available equations are so confusing that just few designers can use any of them to predict product lifetime with confidence [4]. Thus it is not strange that the author has found just a few models of interest in the year of 2003. However the works by Archard [5,6] shall especially be mentioned. Most models are empirical and only few influential parameters are taken into account.In this paper, the main aim of the work is to find an empirical work roll wear model structure suitable for hot strip roll finishing mills. On the basis of this structure a new model is developed that takes more influential parameters into consideration than the presently used on-line model. The equation includes the influence of specific roll force, mean roll surface temperature, irregular edge wear, the number of roll rotation and contact arc length. The roll wear curve, including constant wear and irregular edge wear, presents a box shape, and the reasons also are showed in this paper. Analyzed the influence factors of roller wear is inconsistent in the same roll. Results show that the construction of the work roll mathematical model accords with the general law of work roll wear and tear, it can more accurately forecast roll wear online.

Performance Analysis of Work-Roll Wear Models on Hot Rolling

“…Note that roll wear model analysis found in the literature were usually carried out only considering a few rolling campaigns [8,[10][11][12]. Thus, this database composed by a larger number of rolling campaigns with distinct strip rolled schedules enables a more reliable evaluation of roll wear model predictions.…”

“…Therefore, the most part of the wear models available on the literature consist of contact-mechanic based equations assuming simplified relations between some working conditions. This kind of equations is often defined by considering that few material or process parameters, such as roll hardness [7], strip surface temperature [8], roll-bite contact length [9], roll diameter [10,11] or roll shape [12], are particularly important on the wear process [13].…”

Optimization of continuous variable crown work roll shifting strategy using k‐nearest neighbors algorithm for hot strip rolling mill

“…Byon et al 25 performed a single-stand reversible pilot groove rolling test as well as a rolling test in an actual rod mill, and the effect factors were studied. Liu et al 26 developed a model of work roll wear in hot strip mills. Because of the high hardness, low temperature, and high pressure, the position corresponding to the steel edge got more severe roll wear than other parts.…”

Study on Error Compensation Method of Online Roll Profile Measurement

“…Liu et al designed a new work roll wear model based on analyzing the main factors affecting roll wear. [ 14 ] Yang et al researched the changing law of the work roll thermal contour, and realized the online prediction of the thermal contour of the work roll. [ 15 ] Roll profile measurement can be done on a roller grinder.…”