SU1678511A1 - Continuous casting machine roller - Google Patents

Abstract

This invention relates to metallurgy, in particular to rollers of a continuous metal casting machine. The aim of the invention is to increase the durability of the roller. On the roller band, a grid is made of intersecting grooves whose axes are located with left and right inclination to the band forming. 3 il.

Description

The invention relates to metallurgy, more specifically to rollers of a continuous metal casting machine (continuous casting machine).

The aim of the invention is to increase the durability of the roller.

FIG. 1 shows a clip; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows the node I in FIG. 2

The caster roller contains trunnion 1 and barrel 2 with intersecting grooves 3 formed on its surface.

FIG. 1-3 are marked: L - barrel length; S - groove pitch; D is the diameter of the barrel; h - the depth of the grooves.

The caster roller operates in severe conditions determined by cyclic thermal load and the perception of significant power loads from the ferrostatic pressure and the ingot extension.

As a result, thermal cracks develop on the surface of the barrel, rather quickly turning into a high-angle mesh, and the initial formation of the high-angle mesh is positive, since this removes the constraint of thermal deformations and thermal stress disappears in the surface layer. Subsequently, due to the effect of power loads, which cause large bending deformations (since the rollers with relatively small diameters are long), the cracks grow rapidly and can lead to breakage of the rollers.

In order to crack the cracks and create transition metal zones in the path of their growth, a grid of intersecting grooves with a depth slightly greater than the depth of the cracks of the original high mesh is applied on the surface of the roller barrel.

It has been established that the depth of the cracks of the just formed high-angle mesh is 1.5-2.0 mm, therefore the depth of the grooves must be as high as possible. At a lower value, the application of grooves does not produce an effect, since the cracks are deeper, and at a larger value, the section of the roller weakens unproductively.

The range of caster roller diameters is D 250-600 mm, then the depth ratio

00

with

the bins of the grooves h to the diameter of the rollers will be

g} 25 ° 1 0 ° 0-0025-0.008.

The limit of the ratio of the pitch length of the barrel length is set experimentally.

S (0.03-0.10) 1.

With a smaller pitch, a high mesh with very small cells forms on the surface of the barrel between the grooves, causing intense surface wear, sometimes with chipping, and with a larger one, the growth of the thermal crack is slightly limited along the length of the groove, which leads to its long length and depth.

Example. A grid of grooves on the surface of the barrel is applied in a known manner, for example, on a lathe. Grooves are made with left and right

direction of coils. For example, for a 300 mm roller, the depth of the grooves will be

h (0.025 - 0.008) D (0.75-2.4) mm, and the groove pitch

S (0.03-0.10) 1 - (60-200) mm. Wherein

Brighter high parameters are selected for rollers located in higher temperature zones.

Claims (1)

Invention Formula Roller of the machine for continuous casting of workpieces, containing trunnions and barrel with multi-entry helical grooves of the left and the right direction, characterized in that, in order to increase the durability of the roller, the grooves are made with a depth of 0.0025-0.008 barrel diameter, and the groove pitch is 0.03-0.10 barrel length. Aa PtlЈf FIG. g Figz