SU1544514A1 - Working roll for strip rolling mill stand - Google Patents

Abstract

The invention relates to rolling production, in particular, to hot and cold rolling of strips (sheets). The purpose of the invention is to reduce the energy consumption for rolling by eliminating vibrations in the roll stand system. The mill roll eliminates beats (vibrations) in the roll system. This is achieved by changing the orientation of the flat faces 2 made on the surface of the barrel 1 of the mill roll with radius R. Since the faces 2 are flat, their radius is R ₁ = ∞. Faces are made at an angle of 3-60 degrees. to the longitudinal axis of the roll. The pitch of the faces and the width are chosen so that at least along the length of the deformation zone L could accommodate at least two faces. The edges along the length of the roll may not be solid, but intermittent length of 30-70 mm. 2 ill., 1 tab.

Description

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The invention relates to rolling production, in particular, to hot and cold rolling of strips (sheets).

The purpose of the invention is the elimination of vibration in the roll stand system.

FIG. Shows a mill roll; Fig, 2 - work rolls during rolling strip, the cross-section.

The mill roll has a barrel 1 with a radius R of a cylindrical surface with a microroughness Ra Ј 0.5-1.5 μm, on which faces 2 are made, Since faces 2 are flat, their radius R | equals infinity (r.s °°). Faces 3 on the roll can be made, for example, by grinding it, when the speed of the longitudinal movement of the grinding wheel is much higher than the circumferential speed of the roll being processed. The edges along the length of the roll may not be solid, but intermittent length of 30-70 mm.

The step size of the faces was established by the following relations. In the case of sheet (strip) rolling of thin strips, the absolute reduction is d h - "0.05-2 mm. Then the length of the contact arc is

1 - lRah,

where R is the radius of the roll.

Taking into account the values of 4 h receive, mm

1 A-J (0.05-20) RX (0.25-4.5) / R.

five

0

five

0

five

0

Since the number of faces on the length of 1d is 2-4, the step is equal, mm,

t - (0.063-0.61) / T.

At а 0,5t, the width of the face is equal

a i (0.03-0.3) LH.

If R "300 mm, then a - 0.52-5.2 mm.

The table shows the experimental and calculated data confirming the optimality of the angle of inclination of the faces and the step between them.

The optimal pitch of the faces is equal to t - (0.063-0.61) / R, at which a significant reduction in pressure is ensured as compared to rolling in rough rolls and an increase in the maximum pickup angle compared to rolling in ground rolls.

The use of the invention allows the use of polished rolls with edges to improve the conditions of metal capture by rolls and replace the grooved rolls in the first stands of cold rolling mills, eliminating the vibration of the roll unit.

Claims (1)

Invention Formula The work roll of the stand of the strip rolling mill containing HB, the surface of which is made with flat edges, characterized in that, in order to reduce the energy consumption for rolling by eliminating vibrations in the roll system of the stand, the faces are at an angle of 3-60 to the longitudinal axis roll, and the step between them is equal to (0,063-0,6 1) LH, where R is the radius of the roll. Table continuation Note: H is the strip thickness; ah - absolute compression; 1D - the length of the deformation zone; - the angle of inclination of the faces; t is the step between the faces; P - rolling force; RSG — average normal contact voltages; n is the ratio of average normal stresses when rolled in ground and grooved rolls; RA roll roughness. Editor L.Zaytseva Compiled by V.Vasilyeva Tehred A. Kravchuk Proofreader N. Korol Order 456 Circulation 409 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Figg Subscription