The Study of the process of rolling steel balls in skew rolling mill – metallographic analysis
Piotr Chyła
a:1:{s:5:"en_US";s:40:"AGH University Of Science And Technology";}Abstract
This paper presents the results of metallographic research studies carried out for stock materials as well as the samples collected from the balls formed in the rolling process in a skew rolling mill. The stock material was bearing steel 100Cr6 and the steel from rail scrap. The rolling process was carried out in parallel for the two assumptions: the conventional method (hereinafter referred to as conventional rolling) and the modified method (hereinafter referred to as modified rolling). After the rolling process, three cooling media were used: air, water and oil. The pictures below, which depict microstructures, were taken using the bright-field and the dark-field microscopy technique, the samples were etched with a 4% solution of picral.
Keywords:
skew rolling of balls, microstructure, 100Cr6, rail steelReferences
ASHBY M.F., JONES D.R.H. 1996. Engineering materials. Wydawnictwo Naukowo-Techniczne, Warszawa. Google Scholar
BŁAŻEWSKI S., MIKOSZEWSKI J. 1981. Measurements of metal hardness. Wydawnictwo Naukowo-Techniczne, Warszawa. Google Scholar
BLICHARSKI M. 2001. Introduction to material engineering. Wydawnictwo Naukowo-Techniczne, Warszawa. Google Scholar
CHYŁA P. 2014. Study of the steel balls rolling process in the helical rolling mills. Ph.D. AGH University of Science and Technology, Cracow. Google Scholar
CHYŁA P. 2019. The influence of forming conditions on the hardness of balls formed in the skew rolling process. Metallurgy and Foundry Engineering, 45: 7-17. Google Scholar
CHYŁA P., PATER Z., TOMCZAK J., CHYŁA P. 2016. Numerical analysis of a rolling process for producing steel balls using helical Rolls. Archives of Metallurgy and Materials, 61: 485-491.
Crossref
Google Scholar
DOBRZAŃSKI L. 1993. Metallography and heat treatment of metal alloys. Wydawnictwo Politechniki Śląskiej, Gliwice. Google Scholar
GRONOWSKIJ S.P. 1980. Nowyje processy i stany dla prokatki izdielij w wintowych kalibrach. Mietałłurgija, Moskwa. Google Scholar
PATER Z., TOMCZAK J., BULZAK T. 2015. A cross wedge rolling method for producing balls directly from rail heads. Rudy i Metale Nieżelazne Recykling, 11: 555-559. doi:10.15199/67.2015.11.3.
Crossref
Google Scholar
PRZYBYŁOWICZ K. 2012. Metallography. Wydawnictwo Naukowo-Techniczne, Kraków. Google Scholar
TOMCZAK J., KAZANECKI J., PATER Z., BARTNICKI J., CHYŁA P. 2012a. Research on the process of shaping balls in screw rollers. Mechanik, 11: 927-931. Google Scholar
TOMCZAK J., PATER Z., BARTNICKI J., KAZANECKI J., CHYŁA P. 2012b. Influence of the method of calibrating helical blanks on the quality of rolled spheres in oblique mills. Przegląd Mechaniczny, 11: 33-39. Google Scholar
TOMCZAK J., PATER Z., BULZAK T. 2015. Innovative process of shaping balls from heads of scrapped railway rails. Hutnik – Wiadomości Hutnicze, 6: 387-392. doi:10.15199/24.2015.6.1. Google Scholar
XIAOZHONG R., YONGQING L., YURONG J. 2012. Optimization of Screw Rollin Ball Process Parameters Based on Orthogonal Test, Applied Mechanics and Materials, 201-202: 1190-1193.
Crossref
Google Scholar
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