RU2054979C1 - Method of calibrating finish rolling rolls for rolling steel angles with non-equal flanges - Google Patents

Abstract

FIELD: metallurgy. SUBSTANCE: method of calibrating rolls for rolling non-equal flange steel angles comprises steps of making apex of angles of additional doubling grooved of a lower roll body in such a way, that they have common small and large flanges respectively with main grooved passes; maintaining constant value of distance from tops of the main and the additional grooved passes until mean line of the rolls. EFFECT: enhanced accuracy of roll calibrating. 1 cl, 2 dwg, 1 tbl

Description

 The invention relates to metallurgy and can be used, for example, in the calibration and rolling of a wide range of profiles of unequal angular steel in the finishing rolls.

A known method of calibrating profiles and rolling rolls, which shows a diagram of the construction of the final caliber with constraint and free broadening [1]
The known method [2] in which the wear of the finish gauges for rolling unequal angular steel is shown, and the wear of the caliber is uneven.

A known method of calibrating profiles and rolling finishing rolls for rolling unequal angular steel 100x75, is the closest to the proposed [3]
In this method, the alternate use of finishing duplicate calibers is used, which are four along the length of the roll barrel with vertices at the joint of the shelves in the upper roll body, the calibers are separated by intermediate collars limiting the number of duplicate calibers.

 The disadvantages of the prototype include a small number of duplicate calibers in the rolls, low durability of the set of finishing rolls and, accordingly, increased consumption of rolls during rolling.

 The purpose of the invention is to increase the number of duplicate calibers, increase the durability of the set of rolls and reduce the consumption of rolls during rolling.

 The goal is achieved by increasing the roll resistance by increasing the number of duplicate finishing calibers, the consequence of which is the reduction of the roll material consumption with the simultaneous more rational use of intermediate collars by inserting vertices in them at the junction of the shelves of additional duplicate calibers with double use of the thickness of the shelves without intermediate grinding, as a result what is the expansion of the possibilities of rolling production in improving the efficiency of use of rolling rolls.

The goal is also achieved by the fact that at the place of the intermediate collars in the body of the lower roll, vertex angles are prepared at the junction of the shelves of additional duplicate calibers with common, one by one, shelves with two opposite calibers (respectively, a small shelf with a small and a large with a large), and when rolling after establishing a basic redundant caliber rolls are reversed, unfold in a horizontal plane at ¹⁸⁰ and rolling continued for additional overlapping calibers.

Figure 1 presents the calibration scheme of the finishing rolls according to the proposed method (the numbers 1-2-3-4 show the main backup gauges that are used when the roll I is in the upper position and the lower roll II is filled with metal of one of these calibers (caliber I ) shown in figures 5-6-7 horizontal hatching indicates additional duplicate gauges which are used at the roll position II as the upper and lower rolls I and with the further turn of the rollers in a horizontal plane at ¹⁸⁰ °, the filling metal od one of these calibers (caliber 7) is shown by vertical hatching).

 Thus, the main and additional duplicate calibers have in common with each other a part of the shelf length, respectively a small shelf with a small one and a large one with a large one.

Wherein
l _min = b _max + R, where l _{min is the} minimum possible shelf length, calibrated in the rolls;
b _max the maximum possible filling of the width of the caliber shelf with metal;
R is the radius of curvature at the junction of the shelves.

.Moreover, B =

.

 In FIG. Figure 2 shows a pattern of superimposing workings when the caliber is operating as the main (roll I upper, and lower II) and additional (roll II upper, and lower I). The first case is shown by solid lines. The second case is shown with a dashed line with a similar output. Due to the fact that the same roll plane forms in one case the outer plane of the corner flange, and in the other case the inner plane, the workings of streams do not increase each other, but on the contrary, places with strong workings do not work, and where the workout was insignificant there she is getting stronger. It is as if self-healing caliber streams, which saves the material of the rolls during rolling. From figure 2 it is seen that the most rationally superimposed on each other curves of the character of the development of the shelves when working on the main and additional calibers in the event that the total in these calibers is half the length of the shelf corner.

 As an example, a comparative analysis is carried out with the prototype of the main dimensions of the finishing rolls in accordance with figure 1 for the corner 100x75x8, although this profile is not currently available in GOST 8510-86. The data are given in the table.

t 170,2-8=162,2 мм
l_м 88 +

t 132-8=124 мм
принимают l_б=162 мм, l_м=124 мм.l _min .b _max. + R
for a large shelf
l _b.min = (100 + 2) 1.013 + 10 = 113.5 mm
for a small shelf
l _m.min = (75 + 2) 1.013 + 10 = 88 mm
According to the above conclusions about the rationality of overlapping shelves equal to half their length,
l _b = 113.5 +

t 170.2-8 = 162.2 mm
l _m 88 +

t 132-8 = 124 mm
take l _b = 162 mm, l _m = 124 mm.

162²+124²=204 мм
Расстояние между вершинами в стыке полок основных и дополнительных калибров получают из выражения

sinα=

откуда

преобразуют
B=(h-t

)=l_м•l_б; откуда h

+ t

+ 8•1,41 110 мм.b =

162 ² +124 ² = 204 mm
The distance between the vertices at the junction of the shelves of the main and additional calibers is obtained from the expression

sinα =

where from

transform
B = (ht

) = l _m • l _b ; where h

+ t

+ 8 • 1.41 110 mm.

=540+110-2•8•1,41=637 мм.Diameter values determined
d _o = d _d = D _cp -h = 540-110 = 430 mm
D _o = D _d = D _cf + h-2t

= 540 + 110-2 • 8 • 1.41 = 637 mm.

 The obtained values are given in the table.

 The comparative analysis of the proposed method and the prototype in relation to the main dimensions of the finishing rolls does not show any particular advantages of this or that method. The main advantage of the proposed method is to increase the number of calibers from 4 to 7.

 Using the proposed method for calibrating finishing rolls for rolling unequal angular steel provides the following advantages compared to the existing method: increasing the number of duplicate calibers in the rolls, increasing the durability of the set of rolls and reducing the consumption of rolls during rolling; facilitating the boring of rolls and their calibers, since practically from the same diameters of the workpieces and at the same labor costs it becomes possible to prepare an increased number of calibers; improvement of technical and economic indicators of rolling in the production of unequal angular profiles.

Claims (1)

METHOD FOR CALIBRATING CLEAN ROLLS FOR ROLLING AN EQUAL-BAR ANGULAR STEEL, including the arrangement along the length of the roll barrel of a number of main duplicate calibers with the tops of the corners at the junction of the shelves 90 ^o in the body of the upper roll, characterized in that the vertex angles of the additional duplicate calibers are made in the body of the lower roll with common shelves main calibers, while the distance from the vertices of the main and additional backup calibers to the midline of the rolls is kept equal.

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