SU801908A1 - Method of producing billets - Google Patents

Description

one

The invention relates to metallurgy and can be used to obtain blanks for subsequent rolling them into finished products for a responsible purpose.

A known method for the production of varietal billets, including the continuous casting of ingots in the form of a cross, the removal of the centrifugal part of the ingot due to the sequential rolling of the separation of two mutually opposite rays, and the log of the two remaining rays.

In this case, the cruciform ingot is cast with a ratio of axial dimensions of mutually perpendicular rays of 1.05-1.5; in the rolling process, the separation of two smaller mutually pro-opposite rays produce predominant rib compression of the rest of the ingot ij.

The disadvantage of the known method is the underestimation of the yield of a suitable product, which is 86.584%, which is the reason for the increase in the cost of the preparation of heaps.

A known method for the production of blanks, including continuous from; pouring a symmetric three-beam profile with a base in the area of

joining with other rays equal to 0.72-2.3 of the length of the edge of the beam, And with a base equal to 0.5-1.0 of the length of the edge of the beam, and the subsequent separation of the rays from each other and from the core containing segregation inclusions, rays alternately by the primary effect of the caliber of the mill roll on one

0 from the edges of a single beam in the direction perpendicular to the radius of the beam, and the turning of the roll after the separation of each beam 2.

The disadvantage of this method

5 is a distortion of the cross-sectional shape of the workpiece during the separation of the core, the cause of which is the occurrence of an overturning moment during separation. In connection with

By this, it is necessary to additionally roll the resulting billet to the rectangle, which leads to an increase in the rolling cycle and a decrease in productivity.

five

The purpose of the invention is to increase the productivity of the mill by obtaining a profile of a right geometric shape immediately after the separation of the core.

The goal is achieved by cutting the last beam with an unseparated core into two equal parts in the transverse direction}, one of the halves is turned 180 °, and then both halves are combined with faces opposite to the core and rolled in a paired form in a three-strand caliber to separate the core ; In addition, the biased faces are joined at least in one place, for example, by welding, and after separating the core, the joined blanks are separated mainly by cutting the front and rear ends.

Fig, 1 shows a continuously cast three-beam filter; in fig. 2 and 3, the sequence of separation of two rays; in fig. 4 is a beam with an unseparated core in FIG. 5 two half-rays with an unseparated core after turning 180; in fig. b - two combined halves of the beam with an unseparated core; in fig. 7 and 8 - the sequence of separation of the core; Wah FIG. 9 separate blanks and cores.

On a continuous casting machine, a symmetrical three-beam profile 1 is cast. Then, two beams 2 and 3 are successively separated by preferentially applying caliber rolling ethane on one of the faces of beams 4 and 5 in the direction perpendicular to raduscus teaching. The third beam b with core 7 is cut into two equal parts 8 and 9 in the transverse direction, one of the halves 9 is turned into 180, and then both halves are combined with faces 10 opposite to the core 7 and rolled in a three-strand caliber 11. until the core is separated , resulting in two pentagonal blanks 12 and cores 13.

On a continuous casting machine of the radial type, for example, a symmetrical three-beam profile is cast, each chain of which has parallel faces of 80 wavt length, and both bases are equal to each other and are 80 mm. After the profile is cut to length and heated to the rolling temperature, it is fed to a rolling mill of a double reversing type with two successively located stands. In the first stand, one of the beams was initially displaced by 27 mm relative to the rest of the roll, then, with a roll gauge, the displacement was increased to 58 mm, after which one beam was separated, sweeping it by 75 mm. The separated beam of 82x75 mm section size with a roller table is fed to scissors, gdz is made. The ends are cut and cut to length, and then to adjuvant. The rest

The roll is turned 120 ° and another beam is separated, for which the caliber of the mill roll is applied to the edge of the beam in the direction perpendicular to the beam radius. Three passes alternately shift one beam by 25, 55 and 75 mm, separating it from the rest of the ingot. The separated beam with a cross section of 82x75 mm undergoes a cutting operation and is directed to the adjuvant. The remaining third beam with an unseparated core is fed to the scissors, where it is cut into two equal parts.

Before the second cage, one of the halves is turned over by 180 °, and then both halves are combined with faces opposite to the core, for example, the ruler lines and the front and rear ends are welded.

After that, in the second stand, for three passes with cuts of 30, 30 and 20 mm, cores are separated, which are then used for remelting. After cutting the front and rear ends of the hot cutting saws, two billets of five, coal forms with a height of 80 mm, a width of 80 mm and a rectangular part of 60 mm are obtained. After cutting to the measured lengths, the blanks are sent to the adjuvant.

When using the known method of producing blanks after separation of the core from the beam, the resulting billet has a trapezoidal cross-sectional shape. Such a workpiece is difficult to heat, since trapezoidal workpieces must be moved in a furnace by a pusher. Therefore, it is necessary to roll it in the same stand to a rectangular shape, at least two passes. Using the proposed method allows to obtain a blank with a rectangular cross-sectional shape with three perpendicular faces. Such a bout can be subjected to subsequent heating and rolling without giving it a rectangular cross-sectional shape.

Claims (3)

1. Method for the production of blanks, including the continuous casting of a symmetric three-beam profile with a base in the zone of its junction with other rays equal to 0.72-2.3 lengths of the edge of the beam, and a second base equal to 0.5-1.0 times the length of the edge of the beam, and the subsequent separation of the rays from each other and from the core containing segregation inclusions, characterized in that, in order to increase the productivity of the mill by obtaining a profile of a regular geometric shape immediately after the separation of the core, the last ray with an unseparated core p zrezayut into two equal parts in the transverse direction, one half turn over by 180, and then both halves of the combined facets, opposite the core, and rolled down to form a tandem caliber trehruchevom to the core compartment. 2. The method of claim 1, wherein the combined edges are joined at least in one place, for example, by welding. 3. A method according to claim 2, characterized in that after the separation of the cores, the joined blanks are separated mainly by cutting the front and rear ends. Sources of information taken into account in the examination 1. USSR author's certificate according to the application 2507849/02, cl. B 21 B 1/08, 1977. 2. USSR author's certificate. According to the 249403/02, cl. B 21 B 1/02, 1977.