DOI: 10.18503/1995-2732-2023-21-2-29-36
Abstract
Current development of surface treatment technologies for work rolls is based on the experience of operating existing machines and industrial experiments. We chose electrical discharge texturing from the existing treatment methods for the roll working surface, namely texturing by blasting, electrical discharge texturing, laser texturing, and electron beam texturing, and described it in this paper. The principle of the method lies in making erosion craters on the roll surface. This paper presents the obtained theoretical dependences between the design parameters of the electrical discharge texturing machine for roll surface treatment (number of stations, number of electrodes), process modes (current, voltage, frequency and duration of spark discharges), thermophysical properties of the machined material (heat capacity, thermal conductivity) and the parameters of a textured layer (frequency and height). This contributes to assigning new modes and adjusting existing ones for texturing the surface of rolls of skin pass mills to produce cold rolled sheets in accordance with the consumers’ requirements. Methods Applied. This paper describes a theoretical study conducted on the process of electrical discharge texturing of mill rolls to establish a quantitative relationship between the roughness parameters of the textured surface, the structural elements of the machine, texturing modes and energy intensity of the process. Originality. The conducted studies allow us to establish the relationship between the design parameters of electrical discharge texturing, taking into account the number of stations simultaneously involved in the roll surface treatment, the number of electrodes at one station, the number of electrodes in one row of the station, power modes and roughness parameters: frequency and height. Practical Relevance. The results obtained are useful for metal forming specialists, and operators, when setting up equipment for electrical discharge texturing of rolls, to reduce trial settings.
Keywords
roughness, electrical discharge texturing, microcrater, electrodes, mill roll surface
For citation
Ogarkov N.N., Zvyagina E.Yu. Calculation of Roughness Parameters During Electrical Discharge Texturing of the Surface of Mill Rolls. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2023, vol. 21, no. 2, pp. 29-36. https://doi.org/10.18503/1995-2732-2023-21-2-29-36
1. Tang Jing Gang. Test and analysis on surface roughness and micro-profile of cold rolled steel sheets. Iron Steel Vanadium Titanium. 2004;25(2):66-70.
2. Ogarkov N.N., Platov S.I., Zvyagina E.Yu., Molochkova O.S., Makarova I.V. Choosing the materials performance and the form of an indenter for arrangement of texture at the surface of skin mill rolls. IOP Conference Series: Materials Science and Engineering. 2019;5971(1):012195.
3. Adamek K.Kh. Forming microgeometry of the mill roll surface on texturing machines. Stal [Steel]. 2001;(8):48. (In Russ.)
4. Sun Dale, Yao Lisong, Fan Qun et al. Research on service performances between different textured cold rolls. AIS Tech 2006 Proceedings. 2006;II:285-289.
5. Raimbekov A.M., Tevs V.I., Zakolyukin S.B. et al. Assessing efficiency of electrical discharge texturing of work rolls. Stal [Steel]. 2006;(2):38-40. (In Russ.)
6. Bodyaev Yu.A., Gorbunov A.V., Radionov A.F. et al. Effect of electrical discharge textured work rolls of a skin pass mill on surface microtopography of rolled products. Stal [Steel]. 2006;(5):90-94. (In Russ.)
7. Mukhin Yu.A., Solovyov V.N., Bobkov E.B. Influence of deformation and speed conditions of hot rolling in the finishing stands of wide hot strip mills on ST3SP steel structure. Chernye Metally. 2018;(11):12-16.
8. Ogarkov N.N., Zvyagina E.Yu., Zaletov Yu.D. Effect of a roll working surface treatment method on the quality of cold rolled sheets. Sovremennye metody konstruirovaniya i tekhnologii metallurgicheskogo mashinostroeniya: mezhdunar. sb. nauch. tr. [Current methods of design and technologies of metallurgical machine engineering: international proceedings]. Magnitogorsk: Nosov Magnitogorsk State Technical University, 2006, pp. 39-45. (In Russ.)
9. Rubin G.Sh., Golubchik E.M., Lukyanova K.S. et al. Fractality of structures as a tool of controlling quality parameters of steel products. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2016;14(4):76-84. (In Russ.)
10. Gorbunov A.V. Sovershenstvovanie tekhnologii proizvodstva kholodnokatanoy listovoy stali s trebuemymi kharakteristikami mikrotopografii poverkhnosti dlya avtomobilnoy promyshlennosti: dis. … kand. tekhn. nauk [Improving the manufacturing technology of cold rolled steel with the required parameters of surface microtopography for the automotive industry. PhD (Eng.) thesis]. Magnitogorsk, 2011. 179 p.
11. Ogarkov N.N., Belyaev A.I., Mukhametdinova N.P. Formirovanie parametrov poverkhnostnogo sloya prokatnykh valkov [Forming the parameters of the mill roll surface layer]. Magnitogorsk: Nosov Magnitogorsk State Technical University, 2012, 89 p. (In Russ.)
12. Koinov T., Belskii S.M., Mukhin Yu.A., Chuprov V.B. Flexural forces of the working rollers and the broadening of thin steel strip in hot rolling. Steel in Translation. 2018;48(5):277-283.
13. Wilson G., Parker С. The use of EDT textured rolls in a wide range of application. 44th MWSP Conference Proceedings. 2002;XL:889-898.
14. Utsch M., Vinke P. EDT – Roll texturing technology as a base of modern surfaces in automotive cold mill flat products. MS&T.: Conference Proceeding, 2004, pp. 599-607.
15. Paesold D. Texturierverfahren bei der Herstellung kaltgewalzter Stahlbander. Materialwissenshaft und Werkstofftechnik. 2006;37(7):619-622.
16. Belov V.K., Gubarev E.V., Papshev A.V., Gofman N.G., Begletsov D.O. Development of a scratch test method to determine adhesion and strength properties of coated steel sheets. IOP Conference Series: Materials Science and Engineering. 2019;597(1):012012.
17. Ogarkov N.N., Zvyagina E.Yu., Ismagilov R.R. A theoretical analysis of forming roughness of automotive sheets during skin pass rolling in shotblast rolls. Izvestiya vysshikh uchebnykh zavedeniy. Chernaya metallurgiya [Izvestiya. Ferrous Metallurgy]. 2019;62(8):600-605. (In Russ.)
18. He Yunfeng, Du Dong, Liu Ying, Xiong Lijuan et al. Laser texturing of rolled surfaces. Tsinghua Science and Technology. 2003;8(2):236-240.
19. Wang Hong-bo, Jing Yu-an. Application of laser texturing technology in production of steel strip. Journal of Anshan Institute of Iron and Steel Technology. 2000;23(2):95-98.
20. Belov V.K., Begletsov D.O., Dyakova M.V., Las¬kov S.A., Zhumagaliev N.I., Zhuravlev A.M. Modes of the surface texturing of work rolls for manufacturing sheets with the high quality surface microtopography. Part 2. Selecting the most efficient modes of work roll surface texturing on the HERKULES and PROFITEX 60S electrical discharge texturing machines. Chernaya metallurgiya [Ferrous Metallurgy]. 2017;(3(1407)):83-88. (In Russ.)
21. Polshin A.A., Belskiy S.M., Mukhin Yu.A. Features of the texturing process of work rolls for cold rolling mills. Vestnik Lipetskogo gosudarstvennogo tekhnicheskogo universiteta [Bulletin of Lipetsk State Technical University]. 2017;(3(33)):36-39. (In Russ.)
22. Shatskikh I.I., Tsymbal T.V. Improving an electrical discharge treatment method for cold rolling mill rolls by optimizing treatment modes. Sovremennye materialy, tekhnika i tekhnologii [Current Materials, Engineering and Technologies]. 2017;(2(10)):139-147. (In Russ.)