SU1328010A1 - Sheet rolling method - Google Patents

Abstract

The invention relates to rolling production and can be used in the manufacture of thick sheets. The purpose of the invention is to increase the yield by reducing the side and end trim. The method consists of slab profiling by means of non-uniform deformation, which is carried out with increasing compression from the end parts to the middle of the length, breakdown of the width of the rolls in the broadening passages and longitudinal rolling by the final size. The profiling is performed by crimping edges with a width of 0.1 to 0.3 of the width of the roll in this passage, starting with zero and gradually increasing the compression to the middle to 12-25% symmetrically relative to the transverse axis of the slab. The original slab is transported to a cage with horizontal rollers, the upper one of which has clamps of trapezoidal section. In this case, the slab and finished roll axes coincide with longitudinal rolling patterns, while the transverse rolling pattern of the slab axis and finished roll are perpendicular. In the longitudinal rolling pattern, after turning the slab to 90 ° amp; The crimping with uneven deformation of the near-edge areas of the slab width or roll is either before the breakdown of the width, or after the breakdown of the width before subsequent turning to 90 °. In the transverse rolling pattern, edge profiling across the slab width is performed before breaking down the width and then turning it over. In this case, the shoulders on the upper horizontal roll are set in such a way that the width of the crimped sections is 0.1-0.3 of the width of the slab or roll in the passage. The gap between the horizontal generators of the lower cylindrical roll and the collar on the upper roll, equal to the thickness of the slab or roll, is smoothly changed after the grip, crimping near-edge sections of width to 12–25% in the middle of the length. Then the compression is also smoothly reduced to O with the release of the roll. The yield is increased by 1-3.3%. 1 hp f-ly, 6 ill., 1 tab. (O (L oo 1chE oo o

Description

The invention relates to rolling production and can be used in the manufacture of thick sheets.

The aim of the invention is to increase the yield by reducing the side and end trim.

FIG. 1 shows a route with a longitudinal rolling pattern with edge profiling in front of a broadening passage; in fig. 2 - the same, with edge profiling after a broadening passage; in fig. 3 - route with a transverse rolling pattern with edge profiling in front of the broadening passage; in fig. 4 and 5 - the form of sheets of finite size, top view; in fig. 6 is a rolling roll for carrying out the proposed method, a general view.

Example. The original slab is transported to a cage with horizontal rollers, the upper of which has movable shoulders of trapezoidal section (Fig. 6). In this case, the slab and finished roll axes coincide with longitudinal rolling patterns (Figs. 1 and 2) or with a transverse rolling pattern, the slab axes and finished rolls are perpendicular (Fig. 3).

In the longitudinal rolling pattern after turning the slab by 90 °, compression with uneven deformation of the near-edge sections of the width of the slab or roll is performed either before dividing the width (Fig. 1) or after dividing the width before subsequent turning to 90 ° (Fig. 2). In the transverse rolling pattern, edge profiling across the slab width is carried out before breaking down the width and then turning it over (Fig. 3). In this case, the shoulders on the upper horizontal roll are set in such a way that the width of the crimped sections is 0.1-0.3 of the width of the slab or roll in the passage. The gap between the horizontal forming of the lower cylindrical roll and the collar on the upper roll, equal to the thickness of the slab or roll, is smoothly changed after the grip, crimping the near-edge sections of width to 12-25% in the middle of the length. Then the compression is also smoothly reduced to zero with the release of the roll.

Common to the rolling patterns of FIG. 1-3 is the profiling of the edges of the wide face before subsequent turning, i.e. in the direction perpendicular to the longitudinal axis of the finished roll.

After kantovka 90 ° (Fig. 1, 3) or after the first longitudinal passage (Fig. 2), the peal has convex side and concave end faces. At the same time, the areas thinned as a result of variable deformation create “hard zones that prevent the formation, as a result of subsequent rolling, of convex

Orsov on the finished peal (Fig. 4). On ig. 1-3 arrows show the metal flow at the end sections of the rolls. The convexity of the side faces and the concavity of the end faces during reverse rolling in horizontal rollers are reduced due to the increased broadening at the ends and a larger stretch in the middle of the width, with the result that the shape of the finished rolls in the plan approaches rectangular. "Hard

the zones at the ends of the roll significantly reduce the influence of technological factors on the shape of the sheets in the plan, especially in the first passes, which mainly determine the configuration of the roll.

The energy-power parameters, and, consequently, the energy consumption during rolling, are proportional to the width of the roll. Therefore, for profiling the near-edge sections of the width of a piece, less energy will be required than when profiling over the entire width of the piece, i.e. in comparison with the known method of rolling thick sheets.

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When reducing the width of the crimped areas less than 0.1 of the width of the roll, incomplete rigid zones are formed, which leads to a weakening of the restraining ability of the metal flow along the center of the roll and, consequently, to the formation of convex and wide ends at the finished roll (Fig. 4). And an increase in the width of the crimped areas to more than 0.3 of the width of the roll is impractical due to the increase in the force required for the profiling and the energy consumption.

Reducing the relative reduction in the middle of the length of the roll less than 12% leads to the fact that after one pass in the horizontal rollers after turning 90 °, the thickness of the hard zones and the main part of the roll flattens, with the result that the ends on the finished roll become convex and broadened (Fig. four).

Exceeding the relative reduction in the central part of the length of the roll is more than 25%, on the contrary, by inhibiting the flow of metal in the center of the width of the roll in three or four passes causes the formation of concave ends and weighting of their width (Fig. 5).

Rolling blanks with a thickness of 6 mm from slabs of 19x80x100 mm is carried out on a laboratory reversing mill with a roll diameter of 70 mm, which have a shoulder trapezoidal section with a height of 5 mm and a width of 30 mm moving along the barrel of the upper roll. Material samples - clay. The conditions of roughing stands of plate mills are modeled with a coefficient of 1:13.

The scheme and mode of reductions when profiling the edges, the length of the cut ends and the size of the misalignment at the ends of the finished roll, as well as the yield are presented in the table.

0

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0

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0

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 The sign - means the concave shape of the ends or weft width of the ends. Impregnation according to the modes outside the claims.

The mode of reduction in passages without profiling remains unchanged for all samples.

The yield is determined as follows.

A rectangle of maximum length is entered into the shape of the final rolls, taking into account the technological allowance for the side trim of 2 mm on each side (Fig. 4, 5). The yield is calculated according to the formula

  Hc-Bc-LcHr-Br-Lr, „p. about/

  Hc-Bc-Lc / O

where K is the yield,%; He, Be, Lc- respectively thickness, width

and slab length, mm;

Нg, Вг, Lr-, respectively, thickness, width and length of the finished sheet (written rectangle), mm. As follows from the table, the yield in comparison with the known method is increased by 1-3.3%.

Claims (2)

Invention Formula 1- A method of rolling sheets, including slab profiling by uneven deformation, carried out with increasing crimping from the end parts to the middle of the length, breakdown of the width of the rollers in the broadening passages and longitudinal rolling to a final size, characterized in that in order to increase the yield by reducing side and end trimmings, profiling is carried out by partial compression of the slabs along their width, symmetrically relative to the transverse axis of the slab, deforming their edges at a width equal to 0.1-0.3 of the width of the roll in this passage with a profiling reduction of 12-25%. 55 2. A method according to claim 1, characterized in that the profiling is carried out before or after dividing the width. § cj “a ex  3 5 "with s .one 5J CX  3 i Ci Ci ") : a 3 “D : e: cz "o Ci EX 3 " I. "M with tl eleven  "51 p 5J§ | C O a I- I Kb " §one Phage. five 5