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IRJET- Numerical Analysis of Surface Stress in Hot Rolling
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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 11 | Nov 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1755 Numerical Analysis of SurfaceStress in Hot Rolling Subhashree Pothal1, Chandan Prasad2 1Assistant Professor, Department of Mechanical Engineering, REC, Bhubaneswar, Odisha, India 2M.Tech Scholar, Mettalurgical & Materials Engineering, NIT Durgapur, West Bengal, India ----------------------------------------------------------------------***--------------------------------------------------------------------- Abstract-In a hot strip mill, the quality of the rolled products and the productivity of the mill depend on the efficiency of roll cooling to a great extent. Tostudy the influence of the cooling system on roll performance, a good understanding of the thermal aspects of roll cooling is essential. Mathematical models to compute thermal strain induced at the roll surface duringrolling were developed and applied to the upper work. The models were used to predict thermal stresses/ strains in the roll under various cooling conditions, thus examining the efficiency of the existing roll cooling system and exploring the scope of optimizing it. KEY WORDS: roll cooling; roll; hot strip mill; roll wear. 1. INTRODUCTION In a rolling mill, the efficiency of roll cooling is one of the main factors on which the quality of the rolled products and the productivity of the mill depend. Improper or insufficient cooling of work rolls can not only lead to roll break- age due to excessive differential expansions but can also significantly affect the shape or crown of the roll and result in buckled strips. Tostudy the influence of the cooling system on roll performance, a good understanding of the thermal aspectsofroll coolingis essential. In hot rolling, wear of the work roll takes place mainly because of: (i) Abrasion of the roll surface due to contact with the strip, and in a four high mill, duetocontactwiththeback-uprollalso (ii) Fatigue of the surface layers due to the variable nature of mechanical stresses applied by the strip and the back-up roll (iii) Thermal fatigue of the roll surface due to the temperature cycles undergone bythe outer layersas those are alternately heated by the strip and cooled by the coolant from the spray headers. Therefore, to arrive at an optimum roll cooling system, the following methodology can be adopted: Development of a mathematical model to predict roll temperatures during rolling Analysis of thermal stress and strain induced at the roll surface Utilization of the model to assess the influence of various cooling parameters on the efficiency of rollcooling. 2. DEVELOPMENT OF THE MATHEMATICAL MODEL OF ROLL TEMPERATURE A typical roll cooling arrangement is shownin Fig. 1. As the roll surface comes incontactwiththehotslab/strip,itreceivesheat from the slab/strip at a high rate. After the surface comes out of the roll bite, it is subjected to cooling by water sprays. Fig. 1. Cooling arrangement for work rolls rolling a slab/strip (Back-up rolls and cooling of the lower work roll not shown).
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 11 | Nov 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1756 3. MECHANISM OF THERMAL FATIGUE OF ROLL SURFACE As discussed earlier, in each revolution, the roll surface attains a maximum and a minimum temperature, which gives rise to variation of thermal stress repeatedly,causing thermal fatigue. Compared to the peak temperature attained bythe roll surface in each revolution, the temperature of the bulk of the inside of the roll, which may be called roll body temperature, is much lower. Thedevelopmentofthermalfatiguecanbetterbeseenfromfig2.Anelementoftherollsurfacehasbeenshowninthefigure.Asthis element comes in contact with the hot strip (a) ,its temperature starts rising and it attempts to expand (b). But this expansion is prevented by the main body of the roll which is at much lower temperature. As a result , a circumferential stress in circumferential direction is induced in the element (c). Fig. 2. Development of compressive thermal stress in roll surfaces. 4. ESTIMATION OF THERMAL STRESSES A method forcomputing thermal stressesand strains wasdescribed by Stevens et al. in their article.1) Thesamemethodwas used in the present study as follows: When the temperature of the roll surface increases, equivalent strains are set up both circumferentially and axially and the elastic strain is given by: -αe . ∆ T = e´- m´e´ i.e ε´ = - (1/1-μ´) αe . ∆ T and el = E.ε´=- (E/1-μ´) αe . ∆ T In the plastic regions, the stress at any temperature is assumed to be equal to the yield stress of the material at that temperature. The total strain at any temperature can be obtained from the general fundamental equations as follows: -αe . ∆ T = e´(1-- m´) + e´´(1-m´´) e = e´+ e´´ The following properties of high chrome cast iron were used in computation of thermal stresses and strains at the roll surface: ae=10.9×10—6/°C , m '=0.28 , m ”=0.50 , E=2.1×105 N/mm2 5. DEVELOPMENT OF TEMPERATURE AND THERMAL STRESS IN THE ROLL UNDER VARIOUS COOLING CONDITIONS The temperatures of the work roll and the resulting thermal stresses depend on many factors. Some of the major factorsare mentioned below:
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 11 | Nov 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1757 a) Amount of flow of cooling water b) Location of the water spraying zones c) No. of rows of spraying nozzles d) Distribution of cooling water at the work roll circumference e) Strip lubrication. The model was utilized to assess the influence of different factors on roll cooling and thus arrive at an optimum cooling system. 6. EFFECT OF RATE OF COOLING WATER FLOW The model was used to evaluate roll temperatureand the consequent thermal strain for various rates ofcooling water flow, all other conditions remaining same. Presently, the total rate of water flow (upper work roll,1st stand) is about 317 m3/h. The effects of variation in coolingwater flow on roll temperature as wellas on thermalstrainattherollsurfacearedepicted inTable 1. Table 1. Variation of temperature and thermal strain of the work roll with amount of cooling water (two and three rows of spraying nozzles at entry and exit sides respectively). It can be observed from the Table that by increasing the total water flow from 40 % less thantheexistingflowto30 %less than the existing one, it is possible to reduce the plastic strain/cycle from 4.521× 10—3 to 4.330×10—3, i.e., by 0.191×10—3. The observations from this Table on thermal strain have been summarized in Table 2 Table that by increasing the total water flow from 40 % less than the existing flow to 30 % less than the existing one, it is possible to reduce the plastic strain/cycle from 4.521× 10—3 to 4.330×10—3,i.e.,by0.191×10—3. Theobservationsfromthis Table on thermal strain have been summarized in Table 2 Table 2. Effect of roll cooling parameters on roll temperature and thermal strain per cycle
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 11 | Nov 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1758 The roll temperatures and the thermal strains at the roll surface were determined for vari- ous water flow rates with two rowsof nozzlesat the entry side and different numbers of rowsat the exit side. The findingsaresummarisedinTable3.Itcanbe seen from the Table that if the uppermost row at the exit is withdrawn (resulting in reduction in the total water flow by 18 %), the maximum roll surface temperature and the roll body temperature would increase to 558 and 206°C respectively . Table 3. Effect of roll cooling parameters on roll temperature and thermal strain (No. of rows of nozzles at the entry side=2). 6.1 Effect of Water Distribution at the Roll Circumference Water is sprayed on the work rolls at both exit and entry sides, as can be seen in Fig. 1. In order to optimise the coolingeffect of a given water flow rate, theheader on the exit sideshould distributemore water thanentryside.Itisrecommendedthat70% of the water should be applied from the exit side and 30 % from the entry side in case of high chromium iron rolls.8) In the present as well as the recommended cooling system,thisratiohasbeenmaintainedclosely.Somehavesuggestedthewatertobe distributed in the ratio of 1 : 2 on the entry and exit sides for each stand. 7. ROLL WEAR BY ABRASION Apart from thermal or mechanical fatigue, wearof the rollsurfacetakesplacebyabrasionalso.Inordertoresistabrasion,the working surfaces of the work rollsare made as hard as possible. However,as temperature increases, there is loss ofhardnessin the roll material. When the roll surface comes in contact with the hot strip, it getssoftened; on leaving the roll gap, the hardness increasesagain as the roll surface gets cooled. The higher the rollsurface temper-atureattained in the roll bite, the higheristhe loss in hard- ness and hence the greater is the rate of roll wear due to abrasion.1) If by improving the roll cooling practice, the maximum surface temperature is reduced, the roll wear through abrasion also will reduce. 8. SUMMARY Two mathematical models to predict work roll temperatures during rolling were developed: i. A surface layer model which is applicable to continuous rolling and a situation when roll temperatures have stabilized. ii. A full radius model which is applicable to intermittent as well as continuous rolling and any time after the commencement of rolling. The major findings are as follows: 1) The model predicted the amount bywhich the thermal fatigue of the roll wouldincreaseifanyrowofsprayingnozzles from the entry or exit sides of the work roll were withdrawn, thus justifying the provision of the existing rows. 2) For the present cooling arrangement, the optimum total water flow may be taken as 350 m3/h, which is 10 % more than the present flow.
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 11 | Nov 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1759 3) The model revealed that by increasing the number of rows of nozzles and the water flow rate, it was possible to decrease the plastic strain/cycle in the roll and hence in- crease roll life. However, the increase in roll life over the present one may not be much. REFERENCES 1) P. G. Stevens, K. P. Ivens and P. Harper: J. Iron Steel Inst., (1971), January, 1. 2) A. Tseng: Trans. ASME, 106 (1984), 512. 3) Tseng: Numer. Heat Transfer, 7 (1984), 113. 4) Devadas and I. V. Samarasekera: Ironmaking Steelmaking, 13, (1986), No. 6, 313. 5) Y. Yamaguchi, M. Nakao, K. Takatsuka, S. Murakami and K. Hirata: Nippon Steel Tech. Rep., 33 (1985), 4. 6) F. Kreith and M. S. Bohn: Principles of Heat Transfer, 4th ed., Harper & Row, New York, (1986), 266. 7) K. Murata, H. Morise, M. Mitsutsuka, H. Haito, T. Komatsu and S. Shida: Trans. Iron Steel Inst., Jpn., 24 (1984), No. 9, B 309. 8) R. Viscorova, Untersuchung des Wärmeübergangs bei der Spritzwasserkühlungunter BerücksichtigungdesEinflusses der Verzunderung, PhD dissertation, Technische Universität Clausthal, 2007. 9) R. Wendelstorf, K.H. Spitzer, and J. Wendelstorf, Effect of oxide layers on spray water cooling heat transfer at high surface temperatures, International Journal of Heat and Mass Transfer 51 (2008), pp. 4892–4901. 10) M. Torres and R. Colás, A model for heat conduction through the oxide layer of steel during hot rolling, Journal of Materials Processing Technology 105 (2000), pp. 258–263. 11) W. Chen, I. Samarasekera, A. Kumar, and E. Hawbolt, Mathematical modelling of heat flow and deformation during rough rolling, Ironmaking and Steelmaking 20 (1993), pp. 113–125. 12) F. Seredynski, Prediction of plate cooling during rolling-mill operation, Journal of the Iron and Steel Institute 211 (1973), pp. 197–203. 13) J. Spännar and P. Wide, Finding a representative emissivity value by using greyboxtechnique,Proceedingsofthe20th IEEE Instrumentation and Measurement Technology Conference IMTC 1(2003), pp. 350–354. 14) M.P. Phaniraj, B.B. Behera, and A.K. Lahiri, Thermo-mechanical modeling of two phase rolling and microstructure evolution in the hot strip mill: Part I. Prediction of rolling loads and finish rolling temperature, Journal of Materials Processing Technology 170 (2005), pp. 323–335. 15) R.M. Guo, Heat transfer of laminar flow cooling during strip acceleration on hot strip mill runout tables, Iron and Steelmaker 20 (1993), pp. 49–59. 16) J.A. Visser and E.H. Mathews, Numerical modelling of the heat transfer in and around a steel bar.
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