RU1799647C - Method for grooving of rail-rolling rolls - Google Patents

Abstract

Usage: calibration of rolling rolls for rolling the rails in a finishing two-roll oblique gauge. SUMMARY OF THE INVENTION; when regrinding the caliber, simultaneously with a decrease in the diameter of the roll and a corresponding shift of the caliber towards the axis of the roll, the caliber is also shifted along the axis of the roll toward the side wall of the handle of the closed sole flange, which has a smaller slope and correspondingly greater wear. The offset values are determined by the ratios taking into account the wear values and the ratio of the slopes of the walls of the flange. 1 ill.

Description

The invention relates to metallurgy and can be used, for example, in finishing gauges of an oblique type when rolling rails.

The aim of the invention is to increase the wear resistance of the rolls and the quality of the finished product when rolling in finish, oblique rail gauges.

The drawing shows, in somewhat exaggerated form, the known and proposed methods for calibrating rolling rolls for the finish gauge of a sharp rail duo with upper closed and lower open sole flanges. The thick solid line shows the gauge of the OP50 keen rail at full size when boring new rolls. The slopes of the outer surface of the closed flange of the bottom of the rail to the vertical are KN%, and the inner surface of this flange is KV%. As you can see, in this case, Kn% Qu%. The thickness of the upper base of the flange is indicated by (a). The thin solid line in the exaggerated form shows the development of the caliber section forming the outer surface of the flange, which is indicated (t) and the inner surface is indicated (svg).

As a result, the thickness of the small base of the flange increases to size (A). Even with the same output (OH OB) of the outer and inner surfaces, due to their different inclination to the vertical, radial removal from the rolls is required for their restoration during repair.

Thus, for the outer surface, the amount of removal is indicated by AdH, and for the inside, Ade. With the existing method for calibrating rolls according to the prototype, the total removal should be equal to the removal from the inner surface, because AdB A dH. In this case, the required amount of removal from the caliber along the radius will be

Ad ae100 / KB%. (1)

The proposed method is shown by thin dashed lines:

With

with

Xi oy

about

XI

1. During repairs, the gauge shifts along the center line of the rolls toward the surface of the closed flange, which has a smaller slope to the vertical. In this case, toward the inner surface of the flange by

The direction of displacement is shown in the drawing by a dashed arrow.

2. The amount of development of the outer surface of the closed flange in this case, compared with the existing method, increases and becomes equal to n + t, and the inner surface decreases, i.e.

STv-t.

3. The magnitude of the displacement of the caliber must be calculated so that the values of removal from the outer and inner surfaces of the flange are equal. In this case, radial removal from these surfaces should

Wives:

100 .

Kn% 100.

Ke%

(2)

(3)

Equate to the right side of these expressions we get

gH -1-1 gB -1

Kc% KB fo.

from where

 (STv-t).

 / 0

 We open the brackets in the right part

b + -t $ b-t &

Ghvv / O

t

Convert

t4.Kn% t.M. а - 1 Qu% K8% Ov

t (Qu% + Kn%) Qu% g; q - Qu% O.

KB KB

where from

Kn% Ov - Ka% GHN KY% + KN%

(4)

Radial volume from rolls during repair is determined by equalities (2) and / 1i

(3).

The drawing clearly shows that the amount of removal from the rolls (D dt) according to the proposed method is significantly less compared to the existing method (Adt

5

5

0

5

 Adb). Due to this, the ability to restore calibers is much greater. As an example, we determine the required amount of removal from the rolls and the number of regrind according to the existing and proposed methods for the finishing caliber of sharp rails OP50, with the following assumptions:

1. The total removal from the rolls in diameter - 150 mm, or in radius - 75 mm.

2. The size of the output of the outer and inner surfaces of the closed flange per tab is 1 mm.

3. The gauge is inclined in the rolls at an angle of 10%, therefore, the outer surface of the closed flange is inclined at the same angle (Kn 10%). The slope of the inner surface of the long flange is 1: 7, which

corresponds to --- 14.25%.

With a caliber slope of 10%, a slope of the inner surface of the closed flange in the finishing rolls leaves 14.25 -10 4.25%, hence, Qu 4.25%.

With the existing calibration method, I will remove from the rolls along the radius for one regrinding according to equality (1)

A d a

100

Sq%

. l

100

4.25%

23.5mm

The total number of regrind will be n 75: 23.5 3.2, which corresponds to four tabs of rolls in the work.

With the proposed calibration method: according to equality (4), we determine the necessary displacement: caliber along the axis of the rolls, towards the inner surface of the closed flange

. Kn% 0v-Qu%. - He is 10-1 -4.25 Qu% + Ki% 4.25 + 10

-Sh, T mm.

By equality (2) or (3) we determine the necessary removal from the rolls along the radius

Ad, („-,) -0,404) Jf 0 ,. 4, / o

The total number of regrindings will be n 75:14 -5.35, which corresponds to six tabs of the rolls into operation. In this case, for five regrindings, the caliber must be moved to the side of the inner surface of the closed flange by 5 0.404 2.020 mm, which should be provided when breaking the width collars during boring of wolves.

Thus, in our case, the proposed calibration method is approximately

(6 - 41 by 50% 0.; 100 50%) increases

roll resistance (instead of four roll tabs, it is possible to make six tabs with a total caliber shift in the axial direction of only 2.02 mm).

SUMMARY OF THE INVENTION A method for calibrating rolling rolls for rolling rails, mainly in oblique gauges with a horizontal split along the surface of the rail of the head of a rail, comprising cutting a handle of a closed flange of the sole of the rail with different slopes of the outer and inner side walls with a gradual decrease in roll diameter in the process regrinding, characterized in that, in order to increase the wear resistance of the rolls, productivity and quality of rolled products, in the process of regrinding of the roll the wear is gradual but the caliber is shifted along the roll axis toward the side of the wall; the handle is a closed sole flange with a smaller slope and, accordingly, a greater output in terms of wear, while the magnitude of the caliber displacement along the roll axis and the removal along the radius is determined from the relations

 -On-Qu% Kn% + Qu%

Adt (o-H + t) - A4t (rB + t) 100

Kn%

100

Sq%

where t is the displacement of the caliber in the direction of greater development brook closed flange of the sole;

an - the size of the development of the outer side wall of the brook of the flange;

and in - the magnitude of the development of the inner side wall of the brook of the flange;

Kn% - the angle of the outer edge of the flange;

Kv% - the angle of inclination of the inner face of the flange;

A dt - the value of the radial removal from the rolls ..