ISSN 2594-5297
50º Seminário de Laminação — vol. 50, num.50 (2013)
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Abstract
Today ́s "housing-less Stand", in long product rolling technology, is the preferred type of rolling mill stand used by most steel producers worldwide. The rolling unit includes a stand nucleus with four chocks that are kept together by four threaded stay bolts. The rolling unit is supported by a stand holder and the whole assembly can be shifted sideways in order to keep the rolling line fixed. The housing-less stands due to their compactness, technological features and choice of materials, are considered the most suitable to obtain superior finished product tolerances. This paper analyzes the interaction between the threaded stay bolt and the chock during rolling. Traditionally such interaction takes place in a spherical joint; however, practical experience shows that the interaction occurs systematically perpendicular to the rolling axis. Russula has studied the issue and created a joint that optimizes the roller bearing behavior under load, which increases the roller bearing life. The relative contact between the parts occurs on a cylindrical joint, perpendicular to the rolling axis. An FEM analysis has been performed on two stand sizes (neck diam. 200mm and 280mm). A comparison between the spherical and the cylindrical setups shows that both solutions are valid whereas the cylindrical setup works with a lower contact specific pressure on the joint, which is beneficial to the uniform distribution of the rolling load inside the main bearings.
Today ́s "housing-less Stand", in long product rolling technology, is the preferred type of rolling mill stand used by most steel producers worldwide. The rolling unit includes a stand nucleus with four chocks that are kept together by four threaded stay bolts. The rolling unit is supported by a stand holder and the whole assembly can be shifted sideways in order to keep the rolling line fixed. The housing-less stands due to their compactness, technological features and choice of materials, are considered the most suitable to obtain superior finished product tolerances. This paper analyzes the interaction between the threaded stay bolt and the chock during rolling. Traditionally such interaction takes place in a spherical joint; however, practical experience shows that the interaction occurs systematically perpendicular to the rolling axis. Russula has studied the issue and created a joint that optimizes the roller bearing behavior under load, which increases the roller bearing life. The relative contact between the parts occurs on a cylindrical joint, perpendicular to the rolling axis. An FEM analysis has been performed on two stand sizes (neck diam. 200mm and 280mm). A comparison between the spherical and the cylindrical setups shows that both solutions are valid whereas the cylindrical setup works with a lower contact specific pressure on the joint, which is beneficial to the uniform distribution of the rolling load inside the main bearings.
Keywords
Rolling stand; Housingless stand; FEM analysis; Models.
Rolling stand; Housingless stand; FEM analysis; Models.
How to refer
Fulgosi, Marco;
Zeni, Marco.
THE RUSSULA ROLLING STAND: A NEW DESIGN AND FEM ANALYSIS
,
p. 1145-1156.
In: 50º Seminário de Laminação,
São Paulo,
2013.
ISSN: 2594-5297
, DOI 10.5151/2594-5297-24143
