SU1514430A1 - Method of rolling slabs and strips in universal reversing stand - Google Patents

Description

The invention relates to rolling production and can be used when rolling slabs and strips on slabs and in roughing stands of plate and strip mills. The purpose of the invention is to increase the yield of metal by reducing the end trim. Slabs or stripes are rolled in the vertical rolls of the universal stand in such a way that, when crimped, the roll in each pair of adjacent passes moves in the direction opposite to the previous pass. 3 tab. about

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The invention relates to rolling production and can be used in rolling slabs and strips on slabs and in roughing stands of plate and strip mills.

The purpose of the invention is to increase the yield of metal by reducing the end trim.

The essence of the method lies in the fact that when rolling slabs and strips in the vertical rolls of the universal reversing stand in each pair of adjacent passes, the roll is compressed when the metal moves in the direction opposite to the previous pass.

The method is as follows.

Reverse compression in the horizontal rolls produced with a constant reduction of the solution of the rolls to the desired final thickness of the roll.

During deformation of the roll in the horizontal rolls due to the difference in stretch widths, the ends acquire a convex shape in the form of "tongue", and in vertical ones - a concave shape in the shape of "fish tail", with the length of the front ones during the rolling in the passage of the ends approximately 1.5- 2 times less rear. Such a mechanism for forming the ends of rolls allows us to conclude that the reversible nature of the deformation in horizontal rollers and changing the direction of reductions * in the vertical rolls over pairs of adjacent passages allows to compensate for the formation of irregularities at the ends of the roll by aligning the stretch widths and thereby reducing the mass of the end edge .

As an example, table 1 shows the scheme of reductions in vertical

1514430 A1

1514430

rolls in case of their location in front of

horizontal rollers (due to

by the fact that the first pass in vertical

rolls is single, it is conditional- $

but is considered the first pair).

The verification of the method was carried out on a laboratory universal reversing mill with a diameter of 130 mm horizontal rolls and 98 mm vertical rolls. Both pairs of rolls are driven. Vertical rolls are installed before horizontal. For the experiments, lead samples of 40 x 60 and 40 x 15 x 80 mm and 150 mm long were used, which for eleven passes rolled into rolls of 3.9 x 60 and 3.9 x 80 mm.

The mode of compression in the horizontal rolls for all samples was the same 20 and is shown in table 2.

After each pass measured:

Η _θ and H, is the thickness of the roll before and after the passage; B _o and B, - the width of the roll before and after the passage; ΔН and ΔВ - compression in horizontal and vertical rolls; сГВ - broadening of roll in horizontal rolls.

In the vertical rolls, samples of pro-30 rolled over two versions of the modes and rolling patterns (Table 3). The mode and scheme of rolling for option 1 corresponded to the proposed method, i.e. with the change of the direction of deformation on pairs of adjacent passages in vertical rolls. The mode and rolling pattern for option 2 corresponded to the prototype,

those. with the compression of the roll in the vertical rolls only in even passages.

On the received final peals from the front and rear ends were cut uneven ends and weighed with an accuracy of 0.1 g.

The mass of the edge trim at rolls 3.9x60 and 3x, Ox 80 mm, laminated according to option 1 (the proposed method) was 28.8 and 37.0 g, respectively, and for laminated according to option 2 (prototype) - 51.3 and 69, respectively. , 5

Thus, the proposed method of rolling allows to reduce the mass of the cut about 1.7-2 times in comparison with the prototype.

For example, under the conditions of a draft universal reversing stand of a mid-band or universal broadband mill, it will reduce the consumption of metal in trim by 4-5 kg / t. 25

Claims (1)

Claim Sponsor rolling slabs and strips in a universal reversing stand with alternating reversing adjacent passes of the strip in horizontal and vertical rolls, characterized in that, with the aim of increasing the yield of the metal by reducing the end cut, with rolled 35 ke in the vertical rolls in each pair of adjacent passes, the roll compressed when the movement of the metal in the direction opposite to the previous passage. Table 1 Options Content for the number of a pair of adjacent aisles at vertical rolls ’-___ one G ” ² 1 ³ I 6 Passage number one 2 3 4 5 6 7 . 8 9 10 1 1 Sign of compression * + - + + - - + + - Direction rental ki in the aisle with by pressing vertically drip rolls _ * -> · <- - * BUT- "+" - pass with compression in vertical rolls; - the passage in the verticals of the rolls without compression. 1514430 6 Options Content, passage number • g "1 p ...... chg · -YT '” - PH' - n ₀ . MM 40 35 thirty 25.5 22 18.5 15 12 9 7.1 5.2 n ,. mm 35 thirty 25.5 22 18.5 15 12 9 7.1 5.2 3.9 an, mm five five 4.5 3.5 3.5 3.5 3 3 1.9 1.9 1,3 ε- YN "about' 100, X 12.5 14.3 15 13, '7 15.9 18.9 20 25 21.1 26,8 25 one 60 58.5 2.5 - 80 78 2 - 2 62.5 58.7 3.8 4.0 81, 5 78.5 3 3.5 3 - - - ^one - - - - four - - - 3.1 - - - 2.6 five 61, 8 58,8 3.0 81.1 78.5 2.6 6 61, 3 58,8 2.5 2.5 80.6 78.4 2.2 2.1 7 - - - - - - - - eight - - - 2.5 - - - 2.0 9 61, 3 59.0 2.3 - 80.4 78,8 1.6 - ten 60.6 59.0 1.7 1.7 80.2 79.2 one 1.4 eleven 1.0 Option 2 0.8 one - - - - - - - - 2 63.4 59.0 4.4 3.4 83 79.5 3.5 3.0 3 - - - - -  - - - four 62 58.9 3.1 3.0 82 79.2 2.8 2.5 five - - - - - - - - 6 61.5 58,8 2.7 2.6 81, 4 79 2.4 2.2 7 - - - - - - - eight ' 61.3 59.0 2.3 2.5 80.9 '79 1.9 1.9 9 - - - - - - - - ten 60.7 59.0 1.7 1, 7 80.4 79.2 12 1.4 eleven - 1, o 0.8 total broadening peal for two adjacent passage in horizontal rolls.