SU778827A1 - Billet rolling method - Google Patents

Description

(54) METHOD FOR ROLLING

..five

i.

one

The invention relates to the field of metal forming, in particular, to the technology of rolling billets on crimping and billet units.

The known method of rolling billets, mainly on reversing mills, includes the sequential formation from the slab in multi-gauge calibers simultaneously several, mostly rectangular blanks, connected across the width by bridges into a single roll, with the thickness of the latter being reduced to 0.02-0.25. , and the subsequent separation of blanks by successive reciprocal junction and counterbinding them along the coinciding faces 1.

The disadvantage of this method is the need for high-quality separation of workpieces in two calibers, which is impossible when carrying out a multi-strand production with a large number of streams (five or more) on reversing crimping mills with a limited number of stands, or increases the rolls.

The purpose of the invention is to reduce the consumption of rolls by reducing the number of gauges.

This goal is achieved by the fact that after mutual shearing of the blanks in the finishing caliber, the roll is rotated around the longitudinal axis by 180 ° and the anti-shift is re-rolled in the same caliber.

FIG. 1 shows the original blank; in fig. 2 - a circular gauge with rectangular diagonal streams in the intermediate pass; in fig. 3 — a peal formed in a multi-knob caliber;

10 on figa 4 - the scheme of rolling the roll at the first pass in the finishing caliber; in fig. 5 - peal, rotated around the longitudinal axis by 180 °. after the first pass in the finishing caliber; in fig. 6 - Scheme, 5 rolling of the roll at the second pass in the finishing caliber.

The original blank 1 is formed in a multi-knob caliber 2 in a roll consisting of blanks 3,4, 5, 6 and 7, interconnected by sections of coinciding faces of the set of billets (jumpers) 8, 9, 10 and 11, before it is fed into the finishing gauge .

In the first pass, in finishing caliber 12, blanks 4 and 6 are preferably crimped over facets 13 and 14, thus ensuring the mutual shift of adjacent blanks along coinciding edges. When this occurs, the thinning of the jumpers 16, 18 occurs and the notch is not fully separated by the shear deformation of the jumpers 15 and 17. After the first skip in the finishing caliber, the roll is rotated 180 ° around the longitudinal axis. In the second pass, in finishing caliber 12, blanks 4 and 6 are preferably crimped over facets 19 and 20 opposite to facets 14 and 13, which ensures the opposite to the previous shift of adjacent blanks along the matching faces. When this occurs, a complete qualitative cut of all jumpers and the separation of blanks 3, 4, 5, 6 and 7 from each other. Example. Rolled milled slabs were made in two five-gauge calibers with rectangular diagonal brooks, cut into rolls of 0270 mm of a cage of 280 la. Boratories of metal forming by the Donetsk Polytechnic Institute. The first draft gauge has 28 X 34 rectangular streams, which provide the combination of the faces of adjacent blanks with a jumper thickness of 4 mm. The second finishing caliber has rectangular creeks of 28 X 34 mm, while the second and fourth creeks are cut 2.5 mm lower than the others. If the dimensions were 50 X 185 X 400 mm, they rolled for five gaps in the rough gauge to a thickness of 4 mm lintels and ensure the alignment of the faces of the adjacent blanks. After that, the five-roll roll was rolled in the finishing caliber, providing the displacement of the second and fourth blanks.

Claims (1)

figure 1 relative to the rest. The lintel thickness was 1.5 mm. After the first skip, a rotation was made, the blanks along the longitudinal axis, and the roll was re-rolled in the finishing caliber, shifting relative to the other second and fourth blanks in the opposite direction. The jumpers were completely cut off, and the blanks were separated from one another. The cut surface at the places of separation of the blanks is satisfactory. Claims of Invention A method for rolling billets, preferably on reversing mills; including sequential formation of several simultaneously predominantly rectangular billets connected across the width of the jumpers into a single bar from the slab in multi-ribs, bringing the thickness of the bridges to 0.02-0.25 of the height of the gauge, and the subsequent division of the blanks by successive mutual shift and counter-shift them along coinciding faces, characterized in that, in order to reduce the consumption of rolls by reducing the number of gauges, after the shear of the blanks in the finishing caliber, the roll is rotated District longitudinal axis by 180 ° and protivosdvig performed re-rolling in the same caliber. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 24228012/02, cl. B 21 B 1/02, 1976. P 7 / 3 5 re ig.4