SU707626A1 - Rolling-mill roller bed roller - Google Patents

Description

(54) ROLLER ROLLER OF ROLLING MILL

I

The invention relates to the production and processing of sheet metal, in particular to equipment for rolling mills.

The rollers of the rolling tables of the rolling mills operate in severe temperature conditions and are heated to 500 ° -800 ° C.

The roller of the rolling mill of the rolling mill in the form of a pipe is known, to which the end hubs, which are mounted on the shaft, are welded, sometimes the ends of the pipes are pressed for length. The roller is cooled by supplying water to its outer nOBejixHOCtb.

The disadvantage of this roller is that when the outer surface of the roller is cooled with water as a result of abrupt temperature changes, the roller barrel is covered with a characteristic grid of cracks. In addition, load cooling creates a roller inside: a solid uncooled cavity, which heats the roller to high temperatures. As a result of the intensive heat removal from the outer surface and a slight barrel from the inner cross section, a temperature differential is created. Resulting in thermal stresses that destroy the barrel.

Also known roller rolling mill rolling mill, which includes a hollow cylindrical barrel and bearing axle 2. In the axle holes are made to reduce the mass of the roller.

The disadvantage of this roller is that the arrangement of these holes and the presence of an end cap with a water-reflecting shoulder prevent ventilation of the internal cavity.

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

The goal is achieved by the fact that, in the roller of the rolling mill of a rolling mill including a hollow cylindrical barrel and supporting trunnions, diametrically opposite inlet holes are made on the barrel from one of the trunnions, spreading along the angle of 15-45 ° to the vertical axis of the barrel cross-section , and closer to the other axle, similar outlet openings are made, with a cross-sectional area 10-20% larger than the inlet and directed against rotation:

FIG. I shows the proposed roller, a longitudinal section; in fig. 2 - section A-A of FIG. I; in fig. 3 - section B-Bfig. 1. The roller of the rolling mill of the rolling mill contains a barrel 1 and trunnions 2. In the barrel of the roller there are inlet ventilation openings, 3 and outlet openings 4, installed under. angle L (equal to 15-45 °) to the vertical smallpox of the barrel in the transverse section. The angle a in the section along the inlet aperture (Fig. 2) is directed to the n side of rotation, and in the section along the outlet aperture (Fig. 3) in the opposite direction. When the roller is rotated, air is trapped by the holes that are located with an inclination in the direction of rotation. Air, passage through the inner cavity of the roller, cools the inner surface of the barrel. The arrangement of the holes at an angle of 15-45 ° relative to the vertical axis of the cross-section of the barrel is determined on the basis of the condition that the hole captures the greatest amount of air during rotation, similar to the arrangement of blades of centrifugal or axial fans. The capture of air by the outlet openings inside the cavity of the roller is the same as that of the inlets, which significantly improves the circulating air inside the cavity. To provide improved ventilation and unobstructed exit through the outlet 4, the total cross-sectional area of the outlet openings is made 0-20% larger than the entrance area, i.e. the capacity of the outlets is somewhat higher than the inlets. This is necessary in order to prevent the increase in pressure in the cavity of the roller, which impedes the normal ventilation of the latter. The range of the ratio of the cross-sectional areas is determined from the condition of the condition / J-iZ.J. COOKING OPTICAL ventilation conditions while maintaining the strength properties of the roller (with a further increase in the ratio, the strength of the roller barrel decreases). The presence in the roller of the roller conveyor of the inlet and outlet air vents reduces the heating temperature of the roller and reduces the temperature difference across the cross section of the barrel wall, and consequently, reduces the magnitude of the thermal stresses. All this allows to increase the service life of the roller by 30-35%. Claim of the invention inlets located in the direction of rotation at an angle of 15-45 ° to the vertical axis of the cross-section of the barrel, and outlet holes are made closer to the other axle, with a cross-sectional area 10-20% more inlet and forward lennye against rotation. Sources of information taken into account in the examination 1. Korole. A. A. Mechanical equipment of rolling shops of ferrous and nonferrous metallurgy. M., “Metallurgists, 1976, 2. Makogon VG, and others. Mechanical equipment of broadband mills for hot rolling. M., “Metallurgists, 1969, p. 130, fig. 108

Claims (1)

Claim Roller of the rolling table of a rolling mill, including a hollow cylindrical barrel and supporting trunnions, characterized in that, in order to increase its durability, diametrically opposite inlets are made in the roller barrel from one of the trunnions located in the direction of rotation at an angle of 15-45 ° to the vertical the axis of the cross section of the barrel, and closer to the other trunnion, the outlet openings are made, with a cross-sectional area 10-20% larger than the inlet and directed against rotation.