SU1618474A1 - Rolling mill roll for working stand of strip rolling mill - Google Patents

Abstract

This invention relates to rolling production, in particular, to a mill roll tool. The aim of the invention is to increase the roll resistance by lowering the power rolling parameters. For this, the regular relief on the surface of the roll is made with the ratio of axes 7 ... .30, and the major axis of the face is arranged along the length of the roll barrel. 2 ill., 1 tab.

Description

This invention relates to rolling production, in particular to a rolling mill tool.

The purpose of the invention is to increase the durability of the roll by reducing the energy and power parameters of rolling.

FIG. 1 shows a sheet roll; in fig. 2 — node I in FIG. one..

Mill roll has a barrel 1, the surface of which is made with a relief in the form of flat edges, the ratio of the axes b / a 7 ... 30. At the same time, the width of the faces is made within b 4 ... 70 mm, and the length a1 is 2 mm. Since the length of the face a is constant, its height in all cases is the same. The pitch of the faces is equal to its length. The microroughness of the rolls is equal to P., 4 MKM.

Experiments on testing the proposed mill roll were performed in a laboratory mill with a roll diameter of 50 mm and a barrel length of 350 mm. Roll speed 0.3 m / s.

Rolled strips of aluminum with thickness, b mm and width B 100 mm with technological lubricant in the form of emulsol T. In all cases, the strips were rolled with compression S Ј.30% (& hfc 30.3 mm) with measurement of rolling force. Based on experimental pressures, average normal pressures were calculated. The results of the experiments are presented in the table. As follows from experimental data, when rolling in grinding smooth rolls (test 1), the average pressure at the contact is 98.2 MPa. When rolling strips on rollers with edges on the surface, the average pressure is slightly higher (run 2) s. than in polished rollers., as the ratio b / a increases, the average pressure decreases to 88 ... 89 MPa (test 6 and 7) at b / a 13 ... 16, and then increases again. This effect of the surface topography of the rolls is due to the simultaneous action of two factors. First, the presence

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3. 1 facets (protrusions and valleys): causes an increase in the resistance to metal slip along the roll, and secondly, improves the conditions for the capture of technological lubricant to the deformation zone. The first factor causes an increase in contact stresses, and the second factor - their decrease. From the table, it can be seen that with the ratio b / a of 2.2 ... 5.2, the average pressures and rolling force differ little from those during rolling in the grinding rolls. Under these rolling conditions, the effect of technological lubricant does not block the increase in friction forces due to the presence of faces. When rolling with b / a 7.3 .., 30, the most significant decrease in P cf and P is observed due to the predominant effect of improved gripping conditions for the technological lubricant and, with it, a decrease or no friction forces in the deformation zone. 5 ... 35 the parameters P cf and P differ little from those when rolling with b / a 7.3 ... 30. In this way,

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optimal., is a relief with longitudinal edges with b / a 7.3 ... 30. Rolling in rolls with such a relief provides a reduction in energy consumption for rolling by an average of 8% s compared to rolling in rolls with a polished, uniform surface, and in comparison with the known, it improves the wear resistance of the working surface.

Claims (1)

Invention Formula The mill roll of the stand of the rolling mill, the barrel surface of which is made with a regular relief, in the form of flat edges oriented with a major axis along the length of the barrel, characterized in that, in order to increase the durability of the roll by reducing the power parameters of rolling, the flat edges are made with a longitudinal ratio and transverse axles 7. „.30, FIG. 2