SU1616728A1 - Method of hot rolling on wide-strip rolling mill - Google Patents

Abstract

The invention relates to sheet-rolling production and can be used in hot strip rolling on a broadband mill. The purpose of the invention is to improve the quality of the workpiece by stabilizing the magnitude of the convexity of the cross sectional profile in the range of 0.02-0.05 mm. For this, in the hot rolling strip method, which includes rolling strips divided by the volume of the strips used to heat the rolls and the volume of the strips running as a rolled stock for cold-rolled redistribution, the amount of the heating strips, determined by the number of loading cycles of the work rolls of the last finishing stand The group of the mill is determined from the required values of the convexity of the cross-section of the rolled strip and is determined by the dependence. 1 ill., 1 tab.

Description

The invention relates to the processing of metals by pressure and can be used in sheet-rolling production for the production of bands on a wide-strip hot rolling mill.

The aim of the invention is to improve the quality of the workpiece by stabilizing the convexity of the cross section in the range of 0.02-0.05 mm.

The drawing shows a nomogram, which explains the proposed method.

For the conditions of ShSGP 1700, the method can be implemented in accordance with the following nomogram (see drawing), obtained in accordance with the proposal

zhenoy in the way the pattern (with a value of x 0.045). It can be used as follows. According to the required convexity of the cross-sectional profile (for example, Ah 0.05 mm), the required number of loading cycles of the work rolls of the last stand is determined, which is l / 6.1 thousand cycles (the direction of the Il line, first quadrant). depending on the thickness of the bands intended for heating (the second quadrant, the numbers on the curves), and their widths (the third quadrant, the numbers on the curves, the direction of the line)

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the volume of metal to be heated is divided. In this case, in order to ensure a convexity of 0.05 fm on a roll, it is necessary in the process of heating the rolls to roll a batch of metal with a volume of 320 tons, 1 1000 mm wide, 3.0 mm thick (line direction II -1 -) Typically, in the process of warming up the work of the rolls, several strip sizes are drilled. This nominal frame is used as follows: In the first quadrant, the loading cycles needed to provide the required rigidity (for example, for DN | 0.035 mm, retraction of line II- II) equal to IB, 4 thousand cycles, point a on the graph The number of cycles is determined by the client by loading the work rolls when rolling one of the standard strip sizes (on a jnpHMeps batch of stripes with a volume of 2 5 5 mm and a width of 1000 mm, the direction of the line II2-II2 is about point 16 to the point u). In this case, Hz "5.1 thousand cycles" Next, determine - i toT the required number of cycles per load when rolling another type of strip size, Пц 21пц- Its 8.4 JQ

, 5.1 3.3 tshs; cycles Then, in the IBHCHMOCTH of the range of strips, their volume is 36Q tons (for strips; thickness 7.0 mm, width 900 mm, control line, II, from point C to point c) to

; Thus, the volume of metal for heating the rolls will be 220 + 360 580 tons (220 tons for rolling strip bands 2.5 mm wide, 10,000 mm wide and 360 tons for rolling stripes with a thickness of 7.0 MM and 900 mm wide) in

This nomogram was obtained in re. the result of testing the comparative modes of rolling by the known and proposed methods

1616728

The table shows the results of comparative rolling on the known and proposed methods.

From the analysis of the results of the comparative data obtained, it follows that in the whole range of the proposed method a higher quality of the cold rolled strips is provided than in accordance with the known method, which is determined by the volumes of the second (and lower) grades on which the ready rolled cold rolled products are produced. This is due to the fact that the size dispersion of the convexity of the cross-sectional profile of the rolled stock produced by the proposed method is smaller than it is known in the entire range of parameters s of the method (0.03 x 0.06), although the maximum effect is ensured under optimal conditions for SHSGP 1700: X 0.045

Thus, when using the proposed method, the quality of cold-rolled strips is improved, for example, by flatness parameters, by providing better quality tackle along its cross-sectional profile, for example, with a smaller field (dispersion) of the actual sizes of the roughness in the assembly batch roll

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Claims (1)

Invention Formula The method of hot rolling on a wide-strip mill, including heating of rolls of a rolled batch assembly and subsequent production of a billet for tin, characterized in that, in order to improve the quality of the billet by stabilizing the dispersion of the value of the section section in the range 0, 05 mm, mass installation of the 45th batch is set according to 40 .G 7B-H; B; l250 (uh - x) - 150 (uh - k) + 6.8 ,, five Invention Formula The method of hot rolling on a wide-strip mill, including heating of rolls of a rolled batch assembly and subsequent production of a billet for tin, characterized in that, in order to improve the quality of the billet by stabilizing the dispersion of the value of the section section in the range 0, 05 mm, mass installation of the 45th batch is set according to 40 G; J volume of heating bands. G :, D t-5 diameter of the barrel of the work roll of the last stand of the finishing group of the mill, mm; and Bf thickness and width of strips heat, mm; f: density met. lla, t / m Ah 0 X lentil size required for cross-section cross-section profile, mm; constant depending on the constructive AND | technological parameters of the mill (0.03% X 0.06%), 1616728 The results of comparative rentals according to the known (I) n proposed (P) methods for obtaining a rolled strip on a SHSGP 1700 of steel 08 kp 2.2 x 910 mm in size Notes 31 average values from observations of 128 rolling cases Editor; E "Kopcha Compiled by: V. Ziselman Tehred M.Didzh Corrector T.Malets Order A085 Circulation 413 VNYUSHI of the State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 4/5, Moscow, Zh-35, Raushsk nab. 113035 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Subscription