RU1776469C - Three-roll pass for streetcar rails - Google Patents

Abstract

The invention relates to the field of metallurgy and can be used in the calibration and subsequent rolling of tram grooved rails or other similar profiles using two horizontal rolls and one vertical, forming the side surfaces, the head and the sole of the rail, mainly as the first split, final or intermediate calibers. The aim of the invention is to extend the life of the gauge and roll assembly by reducing the axial forces on the rolls during rolling. The gauge is embedded in the rolls obliquely to the axis of the horizontal rolls with an angle of inclination towards the head equal to the half difference of the angles of inclination of the side surfaces of the groove to the axis of the rail. This allows you to make a split ridge of a vertical roll with the same slopes of its side surfaces, which completely eliminates the axial force on the vertical roll, reduces wear on the surfaces of its ridges and hemmed any bearings. At the same time, due to the inclined position of the horizontal rolls, an axial component of the rolling force appears on the upper roll, acting in the opposite direction to the force from the side of the split ridge and, accordingly, reducing it. This also leads to a decrease in axial forces in the support cones of the horizontal rolls and reduces their wear, which together prolongs the service life of the roll assembly and caliber. 2 ill. V w fc

Description

The invention relates to the field of metallurgy and can be used in the calibration and subsequent rolling of tram grooved rails or other similar profiles using two horizontal rolls and one vertical, mainly as the first split, pre-finish or intermediate gauge.

As a frequent case, the roll assembly can also be used in a four-roll gauge, in which the fourth roll is used as an additional element with its own effects, including the axial unloading of horizontal fir trees.

The aim of the invention is to extend the life of the caliber and roll assembly, which improves the quality of the rolled profile and productivity.

In FIG. 1 shows a three-roll caliber roller assembly for rolling tram grooved rails having a bottom flange of the sole of a half-open type with a control of its width, and the upper flange of a closed type; in FIG. 2 - section of the head of the caliber with a split roller.

According to the invention, the roll assembly comprises two horizontal drive rolls 1, 2 connected to each other by an external and internal support cone I-I, respectively (Fig. 1), a vertical non-drive V | V |

ABOUT

ON Yu

a roll 3, which cuts the trough from the side of the roll 1 with an external support cone, and is secured against movement along the axis of the horizontal rolls on the elongated neck of the horizontal roll 2 with the internal support cone. When preparing (boring) the caliber in horizontal rolls, the caliber is tilted towards the head by an angle (y) equal to the half difference of the tilt angles to the axis of the caliber neck of the side surfaces of the groove from the lip and the profile head. In accordance with the inclination of the caliber by such a value, the vertical roll is made with a split ridge symmetrical with respect to the horizontal axis. Those. angles a wfl are equal to each other (see Fig. 2). In FIG. 1 and 2 rolls forming a gauge according to the materials of the application are shown by a thick solid line, and the roll defined in the caliber is shown by a thick dotted line. The position of the split roller at the moment of capture is somewhat exaggerated shown on the application materials by a thin solid line.

Under these assumptions, we consider the operation of the roll assembly according to the proposed embodiment.

1. The axis of the crest of the vertical roll, dividing the angle between the faces in half, becomes horizontal, and the axis of the neck of the caliber becomes oblique by angle y. The angle (y) is

d - $

- ", where a is the angle of inclination to the axis of the neck

caliber of the surface of the gutter from the side of the lip profile;

$ is the angle of inclination to the axis of the neck of the caliber of the surface of the gutter from the side of the profile head.

In this case, the angle a becomes equal to angle / 3, and the amount of metal deformation by the lateral surface of the ridges from the upper and lower sides when it is introduced into the body of the roll defined in the caliber is the same (a. B. Fig. 2). This is an advantage because eliminates axial forces on a vertical roll. When a / we have a b I tg a, where I is the depth of cut of the metal with a comb.

When the gauge is inclined in the rolls from squeezing the neck of the rail, a horizontal component Pg appears, which reduces the force P from cutting the head with a comb when determining the total pressure on the support cones of the rolls, i.e. RЈ R - Rg.

A specific example of the preparation of a three-roll caliber roll assembly.

In the rail and beam shop of the enterprise, when rolling the Tram-60 tram rails according to GOST, a three-roll caliber roll unit is used as a pre-trim caliber. The slope of the lateral surface of the split crest to the axis of the caliber from the lip side is 1: 3.5, which

corresponds to tg d - - 0.286 (see Fig. 2)

o1 16 ° 3b; and from the head side - 1: 6, which corresponds to the equality tg / 3 - 0.1665.

$ 10 ° 0b. In order to bring the roll unit in line with the proposed one, it is necessary to tilt the caliber when boring the rolls towards the head so that the lateral surfaces of the split

the crest had the same bias towards the horizontal (and Dcm. Fig. 2).

The required angle of inclination of the caliber (y) is determined from the above found dependence

g. 16 ° 361-10 ° V

 3 ° 15

those. 3 ° 15 gauge should be tilted towards the head. In this case, axial

the force on the vertical roll and the cutting force transmitted to the support cones by the value of Pr decreases (see Figs. 1 and 2).

Using the proposed three-roll caliber roll assembly during rolling

Tram rails provide the following benefits:

- axial forces on the vertical roll disappear;

 axial forces on horizontal rolls are reduced, which reduces the production of support cones;

- product quality is improved and productivity is improved by reducing the amount of scrap and reducing the overhead of setup time,

Claims (1)

SUMMARY OF THE INVENTION Three-roll caliber for rolling tram rails, mainly in the first cutting head with the formation of a gutter in it of the pre-finishing or intermediate passages, formed by a pair of horizontal rolls - forming side surfaces, the head and the sole rail, and with respect to which the gauge is inclined toward the rail head, and also with a vertical roll provided with a ridge for cutting the head, such that, in order to extend the life of the caliber and the roll assembly by reducing the axial forces on the rolls during rolling, the caliber is embedded in horizontal rolls with an angle of inclination to the axis of the rolls equal to 3 ° 15 (half difference of the angle of inclination the lateral surfaces of the trough to the axis of the rolled rail), and the split crest of the vertical roll is made with the same slopes of its side surfaces. 1/ v c t Rg. a.S; p & / FIG. 2