ISSN 2594-5327
68º Congresso da ABM — vol. 68, num.68 (2013)
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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. 200 mm and 280 mm). 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. 200 mm and 280 mm). 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.
Palavras-chave
Rolling stand; Housing-less stand; FEM; Long product rolling. 1 Technical contribution to 68th ABM International Congress, July, 30th to August 2nd, 2013, Belo Horizonte, MG, Brazil. 2 Senior Mechanical Engineer, Russula Italia, Udine, Italy. 3 General Manager, Udine Italy. ISSN 1516-392X 3147
Rolling stand; Housing-less stand; FEM; Long product rolling. 1 Technical contribution to 68th ABM International Congress, July, 30th to August 2nd, 2013, Belo Horizonte, MG, Brazil. 2 Senior Mechanical Engineer, Russula Italia, Udine, Italy. 3 General Manager, Udine Italy. ISSN 1516-392X 3147
Como citar
Fulgosi, Marco;
Zeni, Marco.
THE RUSSULA ROLLING STAND: A NEW DESIGN AND FEM ANALYSIS
,
p. 3147-3158.
In: 68º Congresso da ABM,
São Paulo,
2013.
ISSN: 2594-5327
, DOI 10.5151/2594-5327-23382
