RU5743U1 - EXHAUST CALIBER SYSTEM - Google Patents

Abstract

A system of exhaust gauges, mainly of a small mill, including an alternating flat oval gauge with a height to width ratio of 0.4 - 0.5, and a rhombic oval gauge with a ratio of width to height of 0.8 - 0.9, characterized in that the width of the rhombic oval caliber at a distance from its peak equal to 0.05-0.09 of its full height, and the height of a flat oval caliber at the same distance from its edge is 0.4-0.5 of the full width of the rhombic oval caliber.

Description

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EXHAUST CALIBER SYSTEM.

The utility model relates to the processing of metals by pressure and can be used in the production of small assortment and wire (wire rod) on hot rolling machines.

The prior art devices for the production of small assortment and wire (wire rod) on hot rolling mills, see, Polytechnical Dictionary. Soviet Encyclopedia, Moscow, 1980, p. 414- 415.

A disadvantage of the known devices is the deviation of the size of the finished product, due to the insufficient stability of the rolled strip in calibers, as well as frequent cases of jamming, resulting in reduced rolling performance and quality of the finished product.

For the prototype utility model, the authors chose a system of exhaust gauges, including alternating flat oval caliber with a height to width ratio of 0.4-0.5 and a rhombic oval caliber with a width to height ratio of 0.8-0.9 cm. Atlas of calibration of rolls of rolling mills. M., Chermetinformation, 1965, leaf. 226.

The disadvantages of the prototype is the unreliable capture of metal by calibers, in particular by a rhombic caliber (and its incomplete filling). This leads to a deviation in the size of the finished product and frequent cases of stuck rolled strip in calibers, resulting in reduced rolling performance and finished product quality.

M.KL / B21 V 1/08

The solution to this problem is provided by the fact that in the exhaust system of gauges - flat oval and rhombic oval gauges - the width of the rhombic gauge at a distance from its top equal to 0.05-0.09 of its full height, and the height of a flat oval gauge at the same distance from its edges are equal to each other and make up 0.4-0.5 of the full width of the rhombic caliber.

This ratio of geometric dimensions in the system’s calibers ensures reliable metal pickup by rolls, good gauge filling and improved roll geometry, which ultimately improves the quality of rolled products, in particular, reduces rejection by ovality of the wire. Cases of strip jams in gauges are also reduced, and rolling productivity is correspondingly increased.

In FIG. 1 shows a flat oval caliber;

in FIG. 2 - rhombic oval caliber.

The flat oval caliber is indicated by the upper 1 and lower 2 rolls and has side walls 3 made in radii and mated with the horizontal bottom part 4 along the tangent. The height of the caliber in a section drawn at a distance:

1 (0.05-0.09) N

where HI is the height of the rhombic oval caliber,

from its edge is equal to: B (0.4-0.5) B, where B is the width of the rhombic oval caliber.

The rhombic oval caliber is formed by the upper 5 and lower 6 rolls and has bottom parts 7 made in radii and conjugated with straight side walls 3 along the tangent.

values are equal to each other and are determined by the value of 0.4-0.5 of the total width of the rhombic oval caliber.

A flat oval caliber has a height to width ratio of 0.4-0.5, and a rhombic oval caliber has a ratio of width to height of 0.8-0.9, with its bottom parts having radial fillets and tangentially conjugated to the side the walls. These aspect ratios of a flat oval and rhombic oval caliber ensure reliable metal capture in the rhombic gauge and its normal filling.

The distance from the top of the rhombic oval caliber to the section where its width is 0.4-0.5 of the width of the caliber, and the distance from the edge of the flat oval caliber to the section where its height is 0.4-0.5 of the width of the rhombic oval caliber be equal to 0.05-0.09 of the height of the rhombic oval caliber. With values less than 0.05, for example 0.03, the wear of the rhombic oval gauge along the vertical axis will be significant, which will require frequent adjustment of the mill, while the stability of the roll in caliber will be less. If the distance value is more than 0.09 height, for example, O, 11, flats will be observed on the upper and lower surfaces of the roll, which will lead to a deterioration in the geometric dimensions of the roll. The width of the rhombic oval caliber in the section drawn at a distance from its top equal to 0.05-0.09 of its height, and the height of the flat oval caliber in the section drawn at a distance from its edge equal to 0.05-0.09 of the height of the rhombic oval caliber, equal to 0.4-0.5 width of the rhombic oval caliber. At values less than 0.4 of the width of the rhombic oval caliber, for example, 0.35, the efficiency of the caliber system, determined by the ratio of the vertical deformation to the hood, is small. When the ratio is greater than 0.5, for example 0.55, the efficiency increases, but the stability of the strip in the rhombic oval caliber decreases, which leads to a deterioration in the geometry of the roll. With values of the ratio of 0.4-0.5, the efficiency is quite large and the band is stable in caliber.

The use of gauges with the indicated ratios of geometric parameters ensures good stability of the strip in the rhombic oval gauge and, therefore, a decrease in the ovality of the finished profile, and, as well, a decrease in cases of strip jamming, resulting in an increase in rolling productivity.

Claims (1)

A system of exhaust gauges, mainly of a small mill, including an alternating flat oval gauge with a height to width ratio of 0.4 - 0.5, and a rhombic oval gauge with a ratio of width to height of 0.8 - 0.9, characterized in that the width of the rhombic oval caliber at a distance from its peak equal to 0.05-0.09 of its full height, and the height of a flat oval caliber at the same distance from its edge is 0.4-0.5 of the full width of the rhombic oval caliber.