RU1794527C - Method for hot-rolled strip winding - Google Patents

Abstract

Usage: in the rolling industry, in particular when winding into a roll of mountains of chased strips. Essence: before the strip is fed to the drum, its predetermined end, at a distance from the end face equal to 0.10-0.20 of the strip width in one or more places, is preliminarily weakened, decreasing the cross-sectional area of the strip by 30. .50%. Z.p. f-ly, 2 ill.

Description

The invention relates to the field of rolling production, in particular to winding of rolled strips into a roll of mountains.

There is a known method of winding mountains of an embossed strip, including feeding the strip into the gap between the reel drum on one side and the forming rollers and inter-roller wiring on the other hand, interacting the set end of the strip with the inter-roller wiring surface and further winding the strip onto the drum.

A disadvantage of the known method is the unsatisfactory binding of the front end of the strip to the reel drum, which leads to the formation of winding defects, for example, friability and telescopic coils.

The aim of the invention is to improve the quality of winding by increasing the adhesion of the strip to the drum.

To this end, before feeding the strip into the gap between the winder drum and forming rollers and the inter-roller wiring, in the strip section located at a distance from the end of the set end of the strip equal to 0.1 ... 0.2 of its width, the cross section is weakened

stripes, reducing the area of the latter by 30 ... 50%.

The weakening of the cross-section can be made by cutting along the entire width of the strip to a depth of 0.3 ... 0.5 of its thickness, punching holes or notching the edges.

In FIG. 1 shows the moment of formation of the first coil of a roll; Fig. 2 is an embodiment of attenuation of a cross section by a notch of a strip.

The invention is as follows. Before feeding strip 1 to the winder, its predetermined end is 0.10-0.20 strip width and one or more places previously. they are weakened, for example, by an incision along its entire width to a depth equal to 0.3-0.5 of the strip thickness. After passing through the first forming roller 2, the strip abuts against the inter-roll wiring 3 and, under the influence of the reaction of the wiring, bends over a weakened section. The strip is then sequentially fed to the second, third and fourth forming rollers and finally makes the first revolution. Due to the fact that the front end of the strip has a preliminary bend, it is free to go (L

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comes into the throat between the drum 4 of the coiler and the wound strip.

The weakening of the cross section in several places leads to a significant improvement in the capture of the strip by the coiler. However, this complicates the implementation of this method. Therefore, it is advisable to weaken the cross section in several places only on heavy profiles, i.e. with strip thickness over 1700 mm.

The distance of the notch from the end, equal to 0.10-0.20 of the strip width, is due to the following. In order to bend a wider strip at the notch, a greater moment must be applied than for a narrow one. Therefore, with increasing bandwidth, it is necessary to increase the shoulder of the application of force. A ratio of 0.10 for a narrow strip and 0.20 for a wide strip covers the width range of the hot rolled strip. An increase in the shoulder of more than 0.20 bandwidth is impractical because leads to increased metal consumption, a decrease of less than 0.10 significantly complicates the process of applying an incision in the automatic mode and the bending process in this section.

The notch depth in the range of 0.3-0.5 strip thickness reduces the moment of resistance of the strip by 2-4 times. A notch depth of more than 0.5 thickness unnecessarily weakens the cross section, which can lead to a breakdown of the notched end and an emergency situation; a smaller notch depth (less than 0.3) greatly complicates the process of bending the front end.

It should be noted here that Loosen

cross section can be very diverse

 ways. For example, punching

the width of the strip, an incision of the edges of the strip and

etc. The inventors of the present invention have chosen, as an example, a notch over the entire width because this method is most easily implemented on existing hot rolling mill winders.

This method was tested on a laboratory mill 200 HMI. On a strip with a width of 100 mm and 170 mm, a thickness of 10 mm, an incision was made to a depth of 2.4 and b mm, at a distance from the end face of 9, 10, 20, 21 mm for

strips 100 mm wide and 15.3; 17.0; 34.0; 35.7 mm for a strip of 170 mm, respectively 0.09; 0.10, 0.20; 0.21: from the width of the strip and subsequently asked in the winder. The number of turns until fully attached to the reel drum is 6/5, 4/4, 4/3, 3/3, 1,5 / 2, 2 /, 3/4, 2 / 2,2 / 3,2, respectively / 3, 2/3, / 2.

According to the known method, the number of revolutions to full engagement was in the range from 4 to 7. separation of the front section.

Claims (4)

SUMMARY OF THE INVENTION 1. A method for winding mountains of an embossed strip, comprising feeding the strip into the gap between the reel drum on one side and the forming rollers and inter-roller wiring on the other hand, interacting the set end of the strip with the surface of the inter-roller wiring and further winding the strip onto the drum, characterized in that, in order to improve the quality of winding by increasing the adhesion of the strip to the drum, before feeding the strip into the aforementioned gap in the strip section located at a distance from the end th end of the strip is equal to 0.1-0.2 of its width, carried out attenuation band cross-sectional area decreasing in the last 30-50%. 2. The method according to ri.1, characterized in that the cross-section is weakened by an incision along the entire width to a depth of 0.3-0.5 of its thickness. 3. The method according to claim 1, characterized in that the cross-section is weakened by punching holes. 4. The method according to claim 1, characterized in that the weakening of the cross section is carried out by notching the edges.