SU816585A1 - Mill for hot rolling of strip with widening - Google Patents

Description

(54) MILL FOR HOT ROLLING BAND WITH ENLATED

 . one , , .

 The invention relates to rolling production and can be used in the construction of new and reconstruction of existing broadband mills.

In mills intended for rolling strips with a width of, for example, 2500, the narrow point is a sliding stand located in draft group l. .

In addition to wasting time on the necessary folding of the slab, the broadening stand also has a number of disadvantages. This is a low crimping ability and large dynamic loads on the stand and the drive, since slab is fed into the rolls by a wide edge, and the reduction in the broadening stand occurs in one pass. Installation as a broadening reversing stand with the existing scheme will further reduce the mill's productivity.

A mill for hot rolling of a strip with a broadening, inclusive of sequentially established rough and finishing groups of cages and a widening cage as part of a rough group, is known.

The process of rolling the strips with broadening in a known mill is carried out in the following manner. The slab (billet) from the descaler is fed to the broadening stand, canted by 90 in the horizontal plane, rolled into the broadening stand in one pass to the desired width of the sheet, canted beyond the stand to its original position and goes for further rolling to the other rough stands and the finishing stand 2

A disadvantage of the known mill is that the broadening stand reduces the productivity of the mill due to the need for turning the workpiece.

The purpose of the invention is to increase the productivity of the hot rolling mill by eliminating the turns of the billet.

This goal is achieved by the fact that the broadening stand is set offset from the mill axis and rotated about this axis by 90 °.

FIG. 1 shows the layout of the mill equipment; in fig. 2 - e, for the case when in the finished output of the mill a large proportion of policies are rolled with broadening.

The proposed mill contains a descaling machine 1, a widening stand 2, a rough group of stands 3 and a finishing group of stands 4. The rolling process on the proposed mill is carried out as follows. The first station, the receiving roller table of the widening stand 2, rolls in two passes into the widening stand and then enters the rolling stand 3 and the finishing group 4 H and me. Rolling strip 8x U2300 tuM from the next ba 125x1700 x 2650 mm weighing 4.4t. When rolling on a known mill, the 125X1700 X 2650 mm mill rolls out in one pass in the broadening stand to roll 92 x 2300 x 2-650 mm. The theoretical performance is determined by the expression:

ZBSO-M

but

mass sl ba, t;

M

de

t, the cycle time of the rolling in the widening stand, with,

POACh -Op M P-,

-time lifting rotary

de

under the table (5,1),

-time rotate sla ba

Pow (1.85);

- time to lower sla

op (5D);

machine rolling time

f in the broadening cage;

t is the time of pauses between slabs;

four.

de V - rolling speed in the broadening stand ,. M / S; In - the width of the roll, m

1d takes 10 s. Pause time

5.1 + 1.85 + 2.85 + 5.1 + 2.3 + 10 24.35 s,

 a.3 ||, .V-:

When rolling by the proposed method, the slab rolls out in two passes, for example, 125 x 1700 X 2650- 106 x 2000 x 2650- 92 X 2300 x 2650 mm

, a.97 clouds

16.3

Thus, the performance of the proposed mill when rolling strips with broadening increases in comparison with the performance of the mill of known construction by 45%.

Claims (2)

1.Konovalov EE.V. and other reference book distributor. M., Metallurgists, 1977, p. 312. 2.Technological instructions for 2500 hot p | PTI-71-LPTs-4-73, Magnitogorsk, 1973, p. 101. : cycle cycle time is, s, M. t t., - 1 rolling time of rolling in the first and second pass; -time pauses between passes (2c); - time of pauses between slabs (10), - the width of the roll after the first pass, and 2 + 2 + 2.3 + 10 - 16.3 s