RU2288045C1 - Symmetrical complex-contour shapes rolling method - Google Patents

Abstract

FIELD: rolled stock production, possibly rolling symmetrical complex contour shapes, mainly for monorail type and other overhead roads.

SUBSTANCE: method comprises steps of multiple reduction of billet in grooved rolls at using one finishing universal pass. According to invention shaped beam-type piece at first is rolled in four passes where by intensive deformation of its web upper closed flanges are formed and by widening lower lateral flanges are formed. Then in next three passes smooth turning around of upper flanges and turning of lower flanges are realized due to straightening web at lightly reducing and freely widening it. Shape is finally formed in finishing universal pass.

EFFECT: enhanced geometry accuracy of al members of shape, lowered metal consumption, stable rolling process of strip in roll grooved passes.

1 dwg

Description

The invention relates to rolling production and can be used on mills having only one universal stand as a finishing stand when rolling symmetric profiles of complex shape, mainly for monorail type railways, characterized by the presence of walls with channel-shaped bulges located at the edges.

We do not know how to roll profiles of such a complex shape on conventional rolling mills using only one universal stand as a finishing stand.

The closest in its technical essence and the achieved results to the proposed invention is a method of rolling a profile for cableways [1., p. 54., Fig. 11.97].

According to this method, the rolling of the profile is carried out in 7 shaped closed gauges and the profile is less complicated compared to the proposed one. The disadvantage of this method is that the rolling of the profile is carried out in closed gauges with a slope of the side walls of the gauges to the vertical, not exceeding 3%.

This will lead to large removals during their repair and to increased consumption of rolls during rolling.

Using the same method of rolling the prototype to our conditions is not possible, since in one universal finishing stand, due to excessively large reductions, it is impossible to complete the entire inner part of the channel-shaped protrusions on the sides of the profile.

The technical problem solved by the invention is the possibility of obtaining a new rolled profile for suspension roads with corresponding strength characteristics with lower metal consumption compared to the prototype.

The technical result is achieved by the fact that in the method of rolling symmetrical profiles of complex shape for monorail type railways, including multi-pass compression of the workpiece in rolls with calibers, involving the use of a universal finishing caliber, according to the invention, the initial profile formation in four calibers of shaped, beam type , the roll is carried out due to intensive deformation of the wall, increasing the height of the upper closed flanges and the formation of the lower side flanges in the closed shaped ka Ibrahim broadening due to metal.

In the three rolling gauges that follow during rolling, the upper flanges are gradually turned around and the lower flanges are folded by straightening the wall with a slight reduction in the range η = 1.14 ÷ 1.27 and free broadening. The obtained upper and lower flanges from caliber 7 are oriented respectively into the upper and lower flanges of the channel-shaped form of thickenings at the ends of the finishing caliber 8.

Known and proposed technical solutions have the following common features: both of them are methods of rolling profiles for suspended roads - monorails, both include multi-pass compression of the workpiece in rolls with calibers.

The differences of the proposed method are that in addition to the use of the universal-type finishing gauge, the initial profile formation in four calibers of the shaped, beam type, billet is carried out due to intensive wall deformation, increasing the height of the upper closed flanges and formation due to the broadening of the side flanges in the shaped calibers.

In the subsequent three calibers during rolling, the upper flanges are gradually rotated and the lower flanges are folded by straightening the wall with a slight reduction in the range η = 1.14 ÷ 1.27 and free broadening.

The resulting upper and lower flanges from caliber 7 are oriented respectively into the upper and lower flanges of the channel-shaped form of thickenings at the ends of the final universal caliber.

These distinctive features exhibit in their entirety new properties that are not inherent in them in the known sets of features and consist in the possibility of obtaining a new rolled profile for cableways with corresponding strength characteristics and lower metal consumption compared to the prototype.

This indicates that the proposed technical solution meets the criteria of the invention of "novelty."

In the study of other well-known technical solutions in this technical field, signs that distinguish the claimed solution from the prototype were not identified and therefore they provide the claimed technical solution with the criterion of "inventive step".

Figure 1, "a" presents the proposed method of rolling symmetric profiles of complex shape for cableways type - monorail (figure 1, "b"). According to this method, from the shaped, beam type, roll, the initial profile formation is carried out in four calibers (1-2-3-4) due to intensive wall deformation, increasing the height of the upper closed flanges and formation due to the broadening of the side flanges in the shaped calibers. In the subsequent three calibers (5-6-7), the upper flanges are gradually rotated and the lower flanges are minimized by straightening the wall with slight compression and free broadening.

The resulting upper and lower flanges from caliber 7 are oriented respectively into the upper and lower flanges of the channel-shaped form of thickenings at the ends of the final universal caliber.

An example of the implementation of the method when rolling the profile of the monorail M200 (figure 1 "b").

The initial roll from stand 900 of a beam and beam mill of steel grade 5Gps with a temperature of 1030 ° C and dimensions 90-100-60 / 150 mm.

where 90 is the height of the upper flanges;

100 - neck thickness;

60 - the height of the lower flanges;

150 - roll width

arrives on line 800-1 stands.

Here, the profile is formed in four shaped calibers (calibers 1-2-3-4, figure 1 “a”) due to intensive wall deformation, height increase of the upper closed flanges and formation due to broadening of the lower side flanges. The wall strain coefficients in these calibers are:

η ₁ = 1.73; η ₂ = 1.5; η ₃ = 1.34; η ₄ = 2.14.

Then the roll is transferred to the stand 800-II by the slappers. Here, in three shaped calibers (calibers 5-6-7, Fig. 1 “a”), the upper flanges are gradually turned and the formed lower flanges are folded by straightening the wall with slight compression and free broadening, that is, the side surfaces of the roll do not touch side surfaces of calibers. The metal filling of these calibers is shown in FIG. 1 “a” with a thin line.

The wall strain coefficients in these calibers are:

η ₅ = 1.25; η ₆ = 1.14; η ₇ = 1.27.

Next, rolling is carried out in a finishing gauge of a universal type (gauge 8, Fig. 1 “a”), and the upper and lower flanges from the previous caliber are oriented respectively to the upper and lower flanges of the channel-shaped thickening at the ends of the finishing gauge. The deformation coefficient of the profile wall in this case is: η ₈ = 1.13.

This design of gauges of intense deformation of the peal (calibers 1 ÷ 4) and gradual roll reversal due to straightening the wall with slight compression and free broadening (calibers 5-7) in combination with the above profile deformation coefficients along the wall ensure the accuracy of all profile elements, stable rolling strip in gauges.

With a decrease in the degree of wall deformation in calibers 5-6-7 relative to the coefficient η = 1.14, it is possible for the strip to become stuck in caliber with a not very clear setting of the mill (no reduction)

With an increase in the degree of deformation in calibers 5-6-7 relative to the coefficient η = 1.27, wall waviness is possible due to insufficient deformation of the flanges.

The technical and economic advantages of the proposed method consist in the fact that a new method has been developed for rolling symmetrical profiles of complex shape mainly for monorail type railways, which expands the possibilities of rolling production in obtaining new rolled profiles for suspended roads with corresponding strength characteristics with lower metal consumption.

Information sources

1. N.E. Skorokhodov, B. M. Ilyukovich and others. Calibration of complex profiles (reference book. M: Metallurgy, 1979. 232 p.

Claims (1)

The method of rolling symmetric profiles of complex shape mainly for monorail-type railways having a wall with channel-shaped bulges located at the edges, including multi-pass compression of the workpiece in rolls with calibers using a universal finishing caliber, characterized in that the profile formation begins in four calibers from a shaped roll beam type due to intensive wall deformation, height increase of the upper closed flanges and formation due to broadening of the lower lateral in the closed shaped gauges, then in the subsequent three rolling gauges, the upper flanges are gradually rotated and the lower flanges are folded by straightening the wall with slight compression η = 1.14 ÷ 1.27 and free broadening, and the upper and lower flanges from the pre-finishing gauge, they are oriented, respectively, into the upper and lower flanges of the channel-shaped form of thickenings at the ends of the finishing gauge.