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Study of the process of rolling steel balls in skew rolling mill - metallographic analysis

Chyła Piotr

Technical Sciences / University of Warmia and Mazury in Olsztyn

2021

nr 24(1)

171--182

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.

The influence of forming conditions on the hardness of balls formed in the skew rolling process

Chyła Piotr

Metallurgy and Foundry Engineering

2019

Vol. 45, no. 1

7--17

The article presents the research results of analyzing the hardness of the balls formed during the skew rolling process, and then subjected to cooling in different media. The influence of the applied cooling medium (water, quenching oil and air) on the hardness of the obtained balls was analyzed. The effects of the applied methods of rolling (conventional and modified) were compared with respect to the changed hardness of the balls, and the obtained results were referred to the stock materials (bearing steel 100Cr6 and the steel from rail heads).

W artykule przedstawiono wyniki badań twardości kul otrzymanych w trakcie walcowania skośnego, a następnie poddanych chłodzeniu w różnych ośrodkach. Analizie poddano wpływ zastosowanego medium chłodzącego (woda, olej hartowniczy i powietrze) na twardości uzyskanych kul. Porównano również wpływ zastosowanej metody walcowania (konwencjonalna i zmodyfikowana) na zmianę twardości kul, a także odniesiono uzyskane wyniki do wyników otrzymanych w badaniach materiałów wejściowych (stal 100Cr6 i stal uzyskana z główki szyny kolejowej).