SU1424881A1 - Method of rolling sheets - Google Patents

Abstract

This invention relates to metallurgy, in particular to the processing of metals by pressure. The purpose of the invention is to improve the shape of rolls in terms of and reduce the specific consumption of metal. The method consists in that a breakdown of the width by the angle is carried out by a front widened end in the course of rolling. Before reaching the total stretch ratio in the gaps after turning over, the breakdown diagonals alternate with a breakdown of the width of 0.55–0.80 of the total total stretch ratio. 1 ill., 1. Table.

Description

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The invention relates to the processing of metals by pressure and can be used on sheet mills for hot rolling.

The purpose of the invention is to reduce the specific metal consumption by improving the shape of rolls in the plan when rolling sheets of ingots.

The drawing provides a diagram of the task of rolling in rolls at an angle.

 The essence of the invention lies in the fact that when a roll is rolled at an angle, its corner pieces, located on the longitudinal direction along the rolling diagonal of the MF, receive a greater reduction, than the corner pieces of the roll on the transverse diagonal CN. This is achieved due to the fact that the width of the angular parts located on the longitudinal diagonal of the roll (section AB) is smaller than the angular parts located on the transverse diagonal (section CD), and, therefore, the roll in section AB because of the elastic compression the stand (spring of the stand) gets a greater reduction and a greater stretch in the direction of rolling. In the next pass, after turning, the corner part with the vertex C is on the longitudinal diagonal and receives a large stretch in the rolling direction with a breakdown of the width. Thus, when rolling at an angle with alternating diagonals, the angular parts of the roll, located in the bottom part, get greater broadening than the middle sections, thereby eliminating the initial taper of the slip and, therefore, improving the shape of the roll.

The optimum shape of sheet sizes is obtained by rolling, when the width-angle breakdown is produced by the forward extended end during rolling and at the same time provides a ratio of stretch ratios in gaps before turning to be 0.55 - 0.80. This ratio depends on the width of rolled sheets. For example, a ratio of 0.55 is optimal when rolling sheets of ingots weighing 5 tons or less, having an initial taper width of 10-15 mm, and a ratio of 0.8 for large ingots (30-40 tons ) having an initial

taper of 30 - 35 mm.

I.

When the specified optimal ratios are exceeded, the width of the rolls in

.-

 ,

15 20 25 JQ i-

 , 50, 55

;

35

40

 45

the bottom part is larger than the head and, on the contrary, with the values of the indicated ratios smaller than the optimum, the width of the rolls at the bottom is less than the head, and the roll has no rectangular shape.

An example. At mill 5000, 2 ingots were rolled from steel 3 by mass weighing 6 tons into sheets with dimensions of 30x2600x7500 mm. The first ingot was rolled by a known technology. The number of passes in the task of roll into rolls by the head part is equal to the number of passes in the task of roll out by the bottom part. The second ingot was rolled by the proposed method. In this case, the rollout at the breakdown of the width in passes 5-9, 11 and 13 was set by the head part, in the rest - by the bottom part. Modes of rolling both ingots are given in the table.

The total stretch ratio is in gaps before turning over (gaps B, 12, 14) at the first ingot K, to 1,091-1.208-1.100 1.45, and for the second ingot (skips 5-9, 12 and 14) 1,100.1,111- 1,125-1,091-1,128 x1,208-1,100 2.25.

The ratio of stretch coefficients in the gaps before turning over to the total stretch ratio with a breakdown width is 1.45 / 3.3 0.44 for the first ingot and 0.44 for the second ingot - 2.25 / 3.3.3 0.68. After rolling, the shape of the sheet rolls was measured. The taper, defined as the difference in width at the head and bottom of the roll, for the first and second sheets was 85 and 5 mm respectively. Thus, the proposed method allows controlling the shape of the rolls, reducing the specific metal consumption and saving it to 15 kg / t.

FoJemilla invention

The method of rolling sheets, including rolling of an ingot, roll by angle, turning with alternating diagonals of roll for a roll task, characterized in that, in order to improve the shape of rolls in terms of and reduce the specific metal consumption, the breakdown of width by angle is carried out by the forward extended end of in the course of rolling, while the alternation of diagonals of roll is produced before reaching the total coefficient j1424881

This stretch in the gaps after the edge is the total total stretch ratio when breaking down the width of 0.55-0.80 from Ki when breaking down the width.

Stretching (rolling along)

6

80 60

300 270 240 220 195

170 145 120

110 100 Turning (rolling along)

1,26080

1,33360

Canting

Canting

Canting

Canting

Canting

Canting

Turning (rolling at an angle)

300 270 240 220 195

170 145 120

110,100 (rolling along)

80

60

1,100 1,111 1,125 1,091 1,128

1,147 1,172 1,208

1,091 1,100

1,250 1,333

W

Table continuation

Claims (1)

Formula invented by me_ A method of rolling sheets, including rolling an ingot, rolling to an angle, a tilting with alternating diagonals of rolling during a roll task, characterized in that, in order to improve the shape of the rolls in plan and reduce the specific consumption of metal, the width is divided into angles with the front extended end along rolling, while alternating the diagonals of the roll is carried out until the total coefficient of 1424881 of the total total coefficient of drawing when breaking the width. that hood in the gaps after tilting with a breakdown of a width of 0.55-0.80 from Pro- Ingot 1 Ingot 2 start thickness, Η, mm drawing ratio thickness Η, mm drawing ratio Broach (rolling along) 450 - 450 - 1 420 1,071 420 ' from 1,071 2 ‘390 1,077 390 1,077 3 360 1,083 360 1,083 4 330 1,091 330 1,091 Kantovka (rolling on a corner) 5 300 1,100 300 1,100 Kantovka 6 270 1,111 • 270 1,111 Kantovka 7 240 1,125 240 1,125 Kantovka 8 220 1,091 220 1,091 Kantovka 9 195 1,128 195 1,128 Kantovka • 10 . 170 1,147 170 1,147 eleven 145 1,172 145 1,172 12 120 1,208 120 1,208 Kantovka thirteen . 110 1,091 110 1,091 14 100 1,100 100 1,100 Kantovka (rolling along) fifteen 80 1,260 80 1,250 16 60 1,333 ⁶⁰ ’1,333 Table continuation 1- Ingot 1 Ingot 2 musk thickness, N, mm drawing ratio thickness N, mm * drawing ratio 17 45 1,333 45 1,333 18 38 1,184 38 1,184 ¹⁹ 33 1,152 33 1,152 20 thirty 1,100 thirty 1,100 __ Beam axis Compiled by V. Vasiliev Editor V. Danko Tehred L. Oliinyk Corrector 0. Pa Tai Order 4713/7 Circulation 467 Subscription VNIIIPI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Printing Enterprise, Uzhhorod, vul. Project, 4