SU1759486A1 - Drawing roll pass system - Google Patents

Abstract

Use: rolling varietal profiles. SUMMARY OF THE INVENTION: The system comprises octagonal, hexagonal, and diagonal square gauges. The octagonal caliber is formed by two diamonds, which are combined along a large diagonal of 0.3-0.6 m in length. The exhaust capacity of the gauge system increases. 3 ill., 1 tab.

Description

The invention relates to rolling production and can be used in the calibration of the rolls of continuous billet, roughing and intermediate groups of stands of section and wire mills.

A known system of calibers, including successively located two crimp octagonal calibers, diagonal reservoir and square calibers with the means of turning the roll between them, the inclination angle between the faces at the top of each successive caliber of this system is smaller than the previous one by 10 (1-n), where n is the order number of the gauge in the system.

The disadvantage of this gauge system is the presence of convex vertices in the central part of the octahedral gauge bottom, which increases the depth of the gauge cut into rolls, thereby reducing the gripping capacity and compression (the amount of metal displaced in height) of the bar compared to rectangular (Slender) gauges and therefore, it helps to reduce the exhaust capacity of the calibers. The presence of a convex vertex in a diagonal reservoir caliber (rhombic) significantly reduces the free space for metal broadening.

during the subsequent rolling of the diamond in square gauge, which significantly reduces the exhaust capacity of the square caliber and the life span of the rhombic caliber due to the wear of the vertices.

The closest to the claimed gauge system in terms of technical nature is the gauge system, which includes successively located octagonal and hexagonal reservoir and diagonal square gauges with the means of turning the roll between them.

The disadvantage of this gauge system is a reduction in the exhaust capacity of the gauges, due to the fact that the reservoir octagonal gauge has a flat bottom in the form of a sliding gauge and a relatively deep cut of the streams, which reduces the gripping ability of the rolls and the reduction of the roll. Reducing the displaced metal volume in height helps to reduce the exhaust capacity of the gauges. In addition, rolling of an octagonal caliber in a hexagonal reservoir caliber with almost parallel wide horizontal edges is accompanied by more intense relative compression of medium wide edges and less intense

cl

v | SL Yu

-N

00

about

relative compression of the extreme beveled edges. Due to the fact that the private stretching of the extreme parts of the roll exceeds the private stretch of the central part of the roll, by suppressing the stretching of the extreme parts of the central part, an increased transverse movement of the metal into the broadening takes place. This in turn also reduces the exhaust capacity of the gauges ,

The aim of the invention is to increase the exhaust capacity of the gauge system.

This goal is achieved by the fact that in a known system of calibers, including successively located octagonal and hexagonal reservoir and diagonal square calibers, the octagonal reservoir caliber is formed by two diamonds combined along large diagonals, with the diagonals of each of them overlapping each other by 0.3- 0.6 of their length. In addition, the gauge system additionally includes a second, smaller downstream diagonal square gauge.

The proposed system provides a total draw ratio of 3.5-6, which allows reducing the number of passes or equipment used and reducing energy costs, increasing mill productivity.

FIG. 1 shows schematically a crimp octagonal caliber and a workpiece crimped therein; in FIG. 2, a hexagon caliber; in fig. 3 - square diagonal gauge.

Crimp gauge I system (Fig. 1) - octagonal, formed by the upper 1 and lower 2 rollers, set with a gap t. Caliber I is directly made of douh rhombic reservoir calibers 3 and 4, combined with diagonals 5 and 6 on one straight 7, which is the axis of the octagonal caliber I. The rhombic reservoir calibers 3 and A are in turn formed by stepped incisions into rolls 1 and 2, each of which is formed by conical surfaces 8, 9 and 10, 11. Rhombic calibers 3 and 4 are displaced along a common axis 7 in such a way that they overlap each other, i.e. The width BP of each of the rhombic calibers is greater than the distance C between the axes of these calibers BP C. The next caliber of the II system (Fig. 2) is the reservoir hexagonal, and the third caliber III (Fig. 3) is the square caliber embedded in the diagonal . In addition, the exhaust system may additionally have a second gauge IV (Fig. 3), located along the rolling course, a smaller diagonal square gauge.

When rolling roll 12 (FIG. 1), for example, square in octagonal

The caliber, having convex wedge-shaped central areas 13 and 14, formed by conical surfaces 9 and 10 of rolls 1 and 2, significantly increases the exhaust capacity of the caliber. In comparison with the octagonal caliber, this is facilitated by an increase in the metal displaced in height due to an increase in the compression of the central part of the roll by wedge-shaped protrusions 13,14 and the lateral parts of the roll by the side inclined walls of 8, 15 and 11, 16 octagonal caliber. In addition, in connection with a decrease in the depth of incision of caliber I in the rolls, the gripping power increases, and hence the magnitude of the maximum reduction of metal in caliber, which also contributes to an increase in the volume of metal displaced in height. Simultaneously with the increase in offset by. metal height decreases the proportion of metal displaced

from the transverse direction (broadening) due to the restraining lateral inclined concave walls of 8, 15 and 11, 16 caliber. All this contributes to an increase in the exhaust capacity of the crimping caliber I.

After exiting the crimping gauge, roll 17 without turning is rolled in a hexagonal formation caliber AND (Fig. 2) formed by rolls cut into rolls 18. 19 by strands consisting of two conical

the surfaces 20, 21 and the bottom 22, made in the form of a cylinder or a convex barrel-shaped surface, the combination of the size and shape of the roll 17 coming out of the crimp gauge and the hexagonal formation gauge ensures a reliable centering of the roll in it and a high exhaust capacity ensuring the suppression of metal broadening inclined side walls of 20, 21 caliber with

increased tendency for metal to shift in height.

After exiting rolls 18 and 19, the hexagonal peg 23 cantles 90 degrees, and

rolled in square caliber III (Fig. 3), formed by conical surfaces 24.25 and 26.27, embedded in the rolls 28 and 29. In order to ensure maximum draw power of the square caliber III, defined by the limiting angle of capture of the rolls 28 and 29 The side surfaces 30 and 31 of the hexagonal block should be made concave, providing free space for broadening and excluding overfilling of the gauge.

The combination of three consecutive octagonal I, hexagonal II and square III diagonal gauges provides a high total metal extrusion ratio of 3.5-6.

In order to increase the exhaust capacity of the gauge system, the hexagonal reservoir gauge II (Fig. 2) is performed with a larger ratio of the horizontal axis to the height, and the subsequent rolling of the hexagonal strip 23 (Fig. 3) after turning it 90 degrees, is carried out in two successively spaced diagonal square gauges with reduced rolling dimensions.

Example. Pilot rolling to investigate the exhaust gauge system was carried out on a 100 DPI laboratory mill. On rolls with a diameter of 112 mm, five octagonal calibers were cut, each of which is formed by two diamonds, combined along a large diagonal m, overlapping each other by a value equal to 0.2; 0.3; 0.5: 0.6; 0.7 of their length. On the same rolls, five stratum hexagonal gauges were cut, in which the width along the bottom of the gauge and the angle of inclination of the side faces are respectively octagonal gauges, and two diagonal square gauges.

The sizes of calibers are given in the table.

Lead samples of rectangular cross section, the dimensions of which are also given in the table, were used as initial blanks.

To determine the extraction, two base marks were put on the side surfaces of the blanks, the distance between them being 100 mm. From the change in the distance between the marks before and after rolling, the stretch ratio and, consequently, the exhaust capacity of the gauge was determined.

The width of the initial billet was determined experimentally from the condition of centering the roll in caliber.

A rectangular billet with dimensions of 15.3 x 12 mm was set into an octagonal caliber formed by two rhombic reservoir gauges aligned across the width of the diagonals overlapping each other by an amount equal to 0.22 of their length. The width of the caliber is 23 mm. height 9 mm with a gap between the rolls of 3 mm. Rolling was carried out at a speed equal to 0.02 m / s. After rolling, the dimensions of the roll and the distance between the base marks were measured. Maximum crest compression

caliber is 9.6 mm, the angle of capture is 23.7 degrees.

Due to the predominant reduction of the middle part of the roll, a predominant metal flow in the longitudinal direction was observed, the stretching ratio was 1.86 with a broadening of 3.6 mm.

Similarly, the rolling was carried out in octagonal calibers with an overlap of 0.3; 0.5; 0.6; 0.7 diagonal width of a rhombic reservoir caliber. Modes of rolling and sizes of calibers and rolls are given in the table. When rolling in an octagonal caliber with

an overlap of 0.7 diagonal lengths of the diamonds that form it, there was observed a minimum elongation capacity of the octagonal caliber, which is close to the hexagonal one.

Formed octagonal peals rolled in the corresponding hexagonal calibers. Calibers had a deflection equal to 0.25 mm. Caliber sizes and rolling modes are given in

the table.

After rolling in hexagonal gauges, the rolls were rolled in square diagonal gauges, adjusting the amount of reduction by changing the gap between the rollers. When rolling a hexagonal billet formed from an octagonal roll with an overlap of 0.22 of the diagonal of the rhombic caliber, a longitudinal sunset was formed in the diagonal square caliber on the square roll in the hollows formed during rolling in the octagonal caliber.

Thus, the most optimal amount of overlap of two reservoir rhombic calibers, forming an octagonal caliber, is 0.3-0.6 of their length.

Claims (2)

1. Exhaust gauge systems, including successive octagonal and hexagonal reservoir and diagonal square gauges, characterized in that, in order to increase the exhaust capacity of the system caliber, octagonal reservoir caliber formed by two rhombuses, combined on a large diagonal m, and the diagonals of each of them overlap each other by 0.3-0.6 of their length. 2. The system according to claim 1, characterized in that it additionally includes a second, smaller diagonal square gauge located along the rolling course. Calibration Table Swath for Exhaust Gauge System Study // 9 13 № Figure 1 g (