SU1676690A1 - Universal four-roll pass - Google Patents

Description

The invention relates to rolling production, more specifically to the calibration of rolls of predominantly finishing universal caliber for rolling tram grooved rail.

The purpose of the invention is to increase the accuracy of the profile while preventing its twisting during rolling.

The drawing depicts a four-walled universal caliber for rolling a tram grooved rail.

The caliber is formed by upper and lower horizontal rollers 1 and 2 with vertical rollers 3 and 4.

During the preparation (boring) of the gauge in the horizontal rolls, the gauge is inclined towards the head by an angle y equal to the difference in the angles between the inner

the surface of the flange of the sole opposite to the chute and the surface of the sole (p) and between this inner surface of the flange and the vertical ().

The angle p is assumed necessary and sufficient by the condition of restoring the gauge by regrinding the rolls as it wears.

In connection with the inclination of the gauge in the horizontal rolls, the vertical roll on the sole side is tapered with a taper equal to twice the angle of inclination of the gauge in the horizontal rolls. In the drawing, the rolls that make up the caliber are shown by a thick solid line, and the peal given to the caliber is shown by a thick dotted line. Passing through the caliber is horizontal - lOI

ON O O O O

It is shown by a thin solid line, and the axis of the neck of an inclined caliber and the axis of the vertical rolls are shown by thin dash-dotted lines.

When the groove is formed from the side of the vertical roll, a force P acts, which tends to displace the horizontal roll towards the flange of the sole opposite to the groove and crush it. When the caliber is inclined, the profile wall compression is accompanied by the occurrence of an oppositely directed horizontal force Pr, which reduces the effect of force P in the direction of the upper flange of the rail bottom. In this case, the total value of the force in the direction of the flange of the rail foot is equal to the difference of these forces, i.e. Pg P-Pg (Fig. 1). Naturally, this sole flange will thin less.

The lower roll of the roller knot is also affected by horizontal reduction of the neck by the component Pr. which, on the contrary, is aimed at enhancing the processing of the bottom flange in thickness. This will also have a positive value, since it helps leveling the thickness of the flanges of the upper and lower horizons of the rolls.

Reduced twisting profile. This is achieved both by the use of a tapered vertical roll on the sole side, resulting in large circumferential forces on the side. The soles and heads are opposite to each other, as well as

reducing the distance between the head of the profile and the live rolls of the strip coming out of the gauge in the case of an inclined gauge.

As a result of applying the proposed gauge, the dimensional accuracy is increased in the thickness of both flanges of the sole, and the reduction of axial forces on the horizontal roll increases the durability of its bearings,

expands the technological capabilities of the mill in the range of manufactured rails, as it opens up the possibility of reducing the thickness of the flanges of the sole, increasing the depth of the chute.

Claims (1)

The invention is a universal four-caliber primarily for rolling tram grooved rails, formed a pair of horizontal rolls forming the side surfaces of the rail and a pair of vertical rolls forming the roll surface of the head with a groove and the outer surface of the rail foot, so that, to increase the accuracy of the profile while preventing it from rolling, the gauge is embedded into the rolls in the direction of the chute to the line rolling horizontal rolls on the angle of inclination of the inner surface of the flange, opposed to the chute, reduced by the value accepted under the terms of restoring the gauge by regrinding rolls.