SU1282991A1 - Strip working method - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in mechanical engineering for trimming strip edges. The purpose of the invention is to improve the processing performance of the strip. Before trimming the edges, stress concentrators are applied to its end in the form of notches 2. Then, edge 5 is cut to length with its separation from strip 1 due to jumpers 7. Edge separation and its grinding are carried out by bending along its cutting line 9 and in the direction perpendicular pn this line. The bending of the edge is carried out by two rows of tapered rollers 10 arranged in a checkerboard pattern. Due to repeated bending, the edge is destroyed in places of stress concentrators. 2 Il. (L

Description

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The invention relates to the processing of metals by pressure and can be used in mechanical engineering for trimming strip edges.

The purpose of the invention is to improve the processing performance of the strip by simultaneously separating the edge and grinding it.

FIG. 1 shows a band processing circuit; in fig. 2 - strip with trimmed edge.

In a slitting unit, the strips cut the edge with its incomplete separation in the cutting process by creating bridges between the edge and the strip. Before trimming the edges from the strip, stress concentrators, such as nicks, are applied to the end of the strip at certain distances along the strip. At any stage of the processing process of a strip with an incompletely separated edge, for example, prior to winding, the edge is separated from the strip and is crushed by double bending of the edge, carried out simultaneously in the direction along and across it, mixed. Grinding of the edge is carried out in segments equal to the distance between two adjacent stress concentrators.

On the slitting unit, the edge trimming from strip 1 with dimensions of 2-4X250-465 mm of steel grade 50 is made. The metal of the strips has a temporary tear resistance of 750-1100 MPa with a relative elongation of 3-7%. Before trimming, voltage concentrators are applied to its end face in the form of notches 2 2 mm deep at a distance of i = 200 mm from each other. The notches 2 are applied using a drum 3 fitted with carbide inserts 4. Rotating with the drum, the inserts 4 are inserted into the edge of the strip to a depth of 2 mm every 200 mm.

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Then, an edge 5 of a width of 2.5 mm is cut with circular knives 6 with incomplete separation from strip 1 due to jumpers 7 of width 1 mm every 450 mm (/ 2 in Fig. 2), which are formed by depressions 8 on circular knives 6. Separation the edges from the strip and its simultaneous grinding are produced by bending along its cutting line 9 and in the direction perpendicular to this line, shown by the arrows in FIG. 2. The bending of the edges in two directions is carried out by passing it between two rows of tapered rollers 10, arranged in a checkerboard pattern and acting on the strip according to the principle of a multi-roll leveling machine. The passage between the rollers, the edge is repeatedly bent along the cutting line, due to which the jumpers 7 are destroyed. At the same time, in the same rollers, the edges are bent in the direction perpendicular to its trimming line. At the same time, due to 0 multiple bending, the edge is destroyed in the places of the stress concentrator and crushed into 200 mm cuttings, which are collected at the outlet of the bending device into a duct installed under the bending device.

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Claims (1)

Invention Formula The method of processing the strip, which includes feeding the strip, trimming the edge with its incomplete separation during the trimming process and its subsequent final separation from the strip, characterized in that, in order to increase productivity, they are applied to the ends of the stress concentrator strip before trimming, and the strips are carried out by simultaneous bending of the edge along the strip feeding direction and in the direction perpendicular to the strip feeding direction.