SU1219179A1 - Method of rolling flange shapes in universal pass - Google Patents

Description

The invention relates to rolling production. It can be used in the production of flange and shaped profiles on section and rail-beam mills, which have in their rolling equipment universal stands, or stands, equipped with cassettes with non-driven vertical rollers.

The purpose of the invention is to increase the durability of the rolls.

FIG. 1 shows a universal caliber; in fig. 2 is a diagram for calculating a roll offset.

The essence of the method is as follows.

When increasing the reduction in profile flanges, for example, a channel between the driven horizontal and vertical rollers, caused, for example, by the development of a pre-cutting gauge and an increase in the thickness of flanges specified in the universal gauge, or by the need for a thinner flange flange with the surface of the horizontal and vertical rolls, the total work. friction force, which leads to more rapid, intensive wear of the rolls and reduce their durability. Reducing the durability of the rolls with an increase in the reduction of the rollers leads to their more frequent transshipments and ultimately to a decrease in the productivity of the mill. An increase in the length and area of contact of the metal with the rolls leads to an increase in the total pressure of the metal on the rolls, the rolling moment, the consumption of energy during rolling, and the need to use more durable and more massive process equipment.

When the vertical rolls are displaced in the event of an increase in the reduction according to the proposed method, their rolling diameter changes, and with it the rolling force energy parameters.

For example, rolling channel number 10 of steel 45 in the universal caliber with an average radius of the vertical roll Rg 190 mm lead by a known method. The thickness of the assigned flange tp is 8.2 mm, the thickness of the finished flange is t, 7.5 mm, compression of the flange in the universal caliber t is 0.7 mm, the height of the flange is H 50 mm.

92

flange rolling temperature t 950 ° С, rolling speed v, 4.5 m / s. The deformation resistance of the metal of the flange is equal to j 7.35 kg / mm. The contact of the metal of the flange with the rolls is ftp 41.9 it, - RB -4l, 9-0.7 19 (Г 15 mm. The total pressure of the metal on the vertical Roll Pg H - 50-15.8-7.35 5150 kg 5.15 tons. Friction force on the flange tq, f-ii 0.3-7.35 2,205 kg / mm. Friction force work on the flange, which characterizes the wear of the rolls is equal to A (pH t | j, 50.-15, 205 27500 to: g mm. With an increase in the thickness of the assigned flange into the universal caliber t ,, 8.5 mm, compression S t, 1 mm, to, 41, 9-190 19 mm; d 8.4 kg / mm Pg 50-19 -8.4 8000 kg 8 t; t 2.52 kg / mm; A 50-19 2.52 45500 kg.mm

When rolling channel No. 10 according to the proposed method, the flange is deformed by a vertical roller with a rolling radius, resulting in a displacement equal to Rg 133 mm. With St, 1 mm, the arc length of the metal along the flange U | G79.1-133 15.8 mm, "8.5 kg / mm, Pglr 50-15,, 5 6700 kg 6.7 t, J 2.55 kg / mm A 50.15,, 55 31800 kg.m.m.

Thus, the work of the forces of friction on the flange of the proposed method on 13700 kg, mm less than by a known method, or less by 30%, i.e. and roll wear is 30% less. The total pressure on the vertical rolls of the proposed method is reduced by 16% compared with the known.

The amount of movement of the vertical roll is determined as follows (Fig. 2). When rolling the profile with compression 81 and the average radius of the vertical roll R, the length of the contact of the metal with the rolls is equal to

e, 9-8t -R (1)

With increasing crimping by the value of ut, the total reduction of S t is equal to

8t, St + ut

(2)

Proceeding from the condition of equality of the lengths of contact of the metal with the rolls, the length

31219179

metal contact at St, corresponds to the radius R of the vertical roll and is equal to

E,, 9. ft, - R,

Equating expression (1) to expression (3), taking into account expression (2), we obtain

R

St. R

 5t + ut

The amount of movement of the vertical roll can be described by the expression (FIG. 2)

Z (R - R,)

sin rev / 2

Substituting in (5) the expression (4) determines in the final form the amount of movement of the vertical roll towards its larger base with increasing reduction by the value of At:

Z (R 1

eleven; R

6 t + uty sin ot / 2

The proposed method of rolling profiles in a universal caliber can be implemented as follows (Fig. 1).

The rolling of channel 1 is conducted with a flange compression 2 t between horizontal 3 and vertical 4 rollers with a rolling average radius of the vertical roll equal to R (in Fig. 1 this position is shown by dashed lines). With an increase in the reduction of flanges between horizontal

3 and vertical 4 rollers of size l t the reduction is the value of St. With an increase in crimping on the axles, the vertical rolls 4 move towards the larger base vertically (in direction A) and rolling at 8 t is carried out with the radius of the vertical roll equal to R (in Fig. 1 it is shown in solid lines). The amount of movement Z vertical rolls

4determined by expression

 (R.

 J

one

sin 06/2

ten

t5

20

25

Example. Rolling channel number 10 leads to the mill 550 with a numerical universal caliber formed using a cassette. Angle cone, -. 0

The height of the vertical rolls is equal to bU, the height of the vertical roll forming 200 mm, the radius of the larger base is 225 mm. The height of the flange H 50 mm. Rolling begin with compression on the flange St 0.7 mm. The cassette with vertical rolls is set vertically so that the radius of the vertical roll in the middle of the flange is R 190 mm. The length of the contact of the Dshanga metal with the rolls is equal to f -Jl, 9 S t-R -Jl, 9 "0.7" 190.88 mm, the contact area F F H 15.8-50.0 790 mm.

With an increase in compression on the flange by 0.3 mm, the compression is St 1 1.0 mm. At the same time, the cassette is moved towards the larger base of the vertical roll by the amount

thirty

7 vior. 0.7-190 V,. --0 0.7 + 0.3 /

(6)

1 14 MM,

35

which corresponds to the radius of the vertical roll R. 0.7 190 0.7 + 0.3

133 mm.

The length of the contact of the metal of the flange with the rolls is I-J1, 9- 1.0 133.8 15.8 mm. and the contact area is FG, H 15.8-50.0 790 mm.

The proposed method of rolling profiles in a universal caliber, including the vertical rolls moving vertically in the direction of their larger base with an increase in metal squeezing between the vertical rolls by a specified amount, allows

increase the resistance of the rolls and thereby reduce the number of transshipments, increase mill productivity, reduce the pressure of the metal on the rolls, the rolling moment, reduce the size

technological equipment.

 The proposed method of rolling profiles in a universal caliber can be used by metallurgical plants producing shaped and flanged profiles and having rolling equipment as part of

universal stands or cages, equipped with cassettes with non-driven vertical rollers.

Figg

Claims (1)

METHOD FOR ROLLING FLANGE PROFILES IN A UNIVERSAL CALIBER, including metal compression between horizontal and non-vertical vertical conical rollers with axes inclined relative to the vertical axis of the caliber in the caliber plane, characterized in that, in order to increase the roll resistance, they control the compression of the flanges and between horizontal and vertical rolls, displace the vertical rolls vertically; in the case of an increase in compression in the direction of their larger base, and in the case of a reduction in compression in the direction of their smaller base, by an amount determined by the expression St r. 1_____. ^{Z _} ( ^R St + it 'sinoi / 2' λ where St is the compression between horizontal and vertical rolls; R is the radius of the vertical roll corresponding to the compression t; At is the amount of change in compression between horizontal and vertical rolls; ού is the taper angle of the vertical roll. with SS IX Fig! SU. ,, 1219179 1,121