RU2518358C1 - Working stand for rolling of sections at passes - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: working stand for rolling of sections comprises the bed to support pads with at least three rolls that make the pass. Deeper metal processing owing to irregular drawing and high shear strains with production of fine grains is ensured by making the pass of rolls of diameters decreasing or increasing clockwise.

EFFECT: deeper metal processing at straining at multiroll mills.

2 dwg

Description

The invention relates to the processing of metals by pressure, in particular to equipment for the deformation of metal in multi-roll calibers.

Known rolling mill with multi-roll caliber, which is universal and its design allows you to install removable cartridges with two, three, four-roll calibers (see AS USSR No. 778831, class B21B 13/10, publ. In BI No. 42 , 1980).

A disadvantage of the known stand design is the inability to use rolls of different diameters in it and, therefore, the impossibility of redistributing hoods and creating large shear deformations, which makes it difficult to obtain a fine-grained metal structure.

The closest analogue to the claimed object is a cage for rolling metal, containing a bed, in which there are cushions with rolls of the same diameter placed in them, forming a multi-roll caliber (see in the book of MG Polyakov and others “Metal deformation in multi-roll calibers” , M.: Metallurgy, 1979, p. 28).

The disadvantage of this stand is the impossibility of a more complete study of the metal due to the redistribution of hoods and the creation of large shear deformations, which does not allow to obtain a smaller grain score.

The objective of the present invention is to develop such a design of the working stand, which would provide in caliber a more complete study of the metal due to the unevenness of the hoods and the creation of large shear deformations, which will allow to obtain a smaller grain score.

The problem is solved in that the known cage for rolling metal, containing the frame, in which there are pillows with placed rollers forming a multi-roll caliber, according to the invention contains at least three rolls forming a caliber. The cage is equipped with rolls, the diameters of which decrease or increase in the clockwise direction and have the following ratio: D ₁ <D ₂ <... <D _i <... <D _n .

In the inventive stand, the distinguishing features characterizing the supply of its rolls, the diameters of which decrease or increase in the direction of clockwise movement, allow you to create a new technical effect, which consists in a more complete study of the metal due to the uneven distribution of hoods and the creation of large shear deformations, which allows to obtain smaller grain score. Based on the analysis of known sources of information, we can conclude that for the specialist, the inventive stand for rolling metal does not follow explicitly from the prior art, and therefore meets the condition of "inventive step".

The invention is illustrated by drawings, where:

- figure 1 shows a three-roll working stand with rolls, the diameters of which decrease in the clockwise direction and have the following ratio of diameters: D ₁ <D ₂ <D ₃ ;

- figure 2 shows a four-roll stand with rolls, the diameters of which decrease in the clockwise direction and have the following ratio of diameters: D ₁ <D ₂ <D ₃ <D ₄ .

The working stand includes a frame 1 (Fig. 1, 2), inside which pillows 2 (Fig. 1, 2) are installed, which are fixed from movement by nuts 3 (Fig. 1, 2). In the pillows 2 on the axles 4 (Fig. 1, 2), rolls 5-7 (Fig. 1) are installed, having different diameters in accordance with the ratio: (D ₁ <D ₂ <D ₃ ) and forming a gauge (conditionally highlighted in the drawings double hatching). In this case, the axis 4 of the rolls 5-7 are installed in the pillows 2 using bearings 8 (figure 1). From axial movement relative to the pillows 2, the rolls 5-7 are limited by calibrated washers 9 (Fig.1-2).

The inventive stand can be equipped with at least three rolls, as shown in figure 1. The cage in figure 2 is equipped with four rollers 10-13 (figure 2) having different diameters in accordance with the ratio (D ₁ <D ₂ <D ₃ <D ₄ ) and forming a caliber. In this case, the rolls 10-13 are mounted on the axis 4 using the hubs 14 (figure 2) for fastening the bandage. From axial movement relative to the pillows 2, the rolls 10-13 are limited by calibrated washers 9.

The device operates as follows.

The deformable metal is passed through a gauge.

When rolling in a cage (Fig. 1), a zone of accelerated metal flow is formed at the contact of metal with a large roller 7, and a zone of slowed metal flow is formed at the contact with a smaller roller 5, which makes it possible to more evenly redistribute the hood over the cross section of the deformable workpiece, which will make it possible to obtain a smaller grain score due to the appearance of large shear deformations.

When rolling in the cage (Fig. 2), zones of accelerated metal flow are formed at the contact of metal with rolls having the largest diameter of 12-13, and zones of slowed metal flow are formed at the contact of metal with rolls having smaller diameters of 10-11, which leads to to the general uneven redistribution of the hoods over the cross section of the deformable workpiece and the appearance of large shear deformations, which makes it possible to obtain a smaller grain score.

Based on the foregoing, we can conclude that the inventive work stand is operational and eliminates the disadvantages that occur in the prototype, which is confirmed by an example implementation. Accordingly, the claimed solution may be applicable in the rolling industry, and therefore, meets the condition of "industrial applicability".

Claims (1)

A working stand for rolling metal profiles, containing a bed, in which there are pillows with at least three rolls placed in them, forming a gauge, characterized in that the caliber is formed by rolls, the diameters of which decrease or increase in the direction of clockwise movement when they are , respectively: D_one> D₂> ...> D_i> ... > D_n or D_one<D₂<... <D_i<... <D_n.

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