SU1255233A1 - Working stand of tube electric welding unit - Google Patents

Description

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The invention relates to the processing of metals by pressure and can be used in the manufacture of pipes on continuous pipe welding machines.

The aim of the invention is to reduce the number of rolls and increase the quality of welded rolls; pipes.

Making a work section of a roll (a section where, unlike a blank, the strip contacts the roll) with an annular groove with a diameter smaller than the diameter of the rest of the roll 0.04-0.05%, allows creating a reduced relative to the rest of the strip parts of the strip compression.

The specified range of the difference of the diameters of the central part of the roll and the annular groove, equal to 0.04-0.05% of the diameter of the central (and the rest) part of the roll, ensures, during rolling, the ratio of the amount of compression of the strip edges to the rest of it, equal to 0.5-0.7 that will reduce the uneven wear of the rolls.

The length range of the annular groove, equal to 0.07-0.09 in the length of the working section of the roll, ensures that the required ratios of the edges and the rest of the strip are compacted with an existing variation in the strip width, while the specified range of the circular groove is sufficient for the rolling process make grinding of rolls only in areas that are close to the central one.

The proposed design of the work rolls ensures stabilization of the rolled strip on the rolling axis, which increases the stability of the edges of the rolled strip during molding, reduces wear in alcoves in the areas corresponding to K) to the non-slip sections of the strip. The wear of the central section of the roll exceeds the wear of the adjacent areas.

The contact of the support and work rolls is absent in areas adjacent to the central portion of the work rolls. Such an arrangement of the work rolls allows, in the rolling process, to grind them only in the areas adjacent to the central one.

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Using the grinding of the indicated sections of the work rolls, as they wear out, the ratio of crimping of the edge sections of the sy and its central part can be maintained (-the stability of the position of the strip on the rolling axis, as well as the geometrical parameters of the rolled strip,. and pipe welding. The controlled wear of the work rolls allows an increase in the time between transshipments, i.e., reduce equipment downtime.

S5 The same tasks can be solved by using the upper work roll of the indicated construction, and the lower roll with a smooth barrel of constant diameter equal to the diameter of the central portion of the upper roll. Since the rolled strip enters the molding in the forming mill, the edges of the strip have a shape that is favorable for bending.

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Figures 1 and 2 illustrate the proposed construction of work rolls for a quarto mill.

Acceptance of notation: 1 - work rolls (upper and lower); 2 - support rolls; 3 shows the cross-sectional profile of the rolled strip; 4 - the neck of the work rolls.

35 An example of determining the parameters for the manufacture of the proposed work rolls was carried out in relation to a quarto 800 mill located in the TESA 20-102 line of the Seversky Pipe Plant (Figures 1 and 2). The diameter of the central part of the work roll D, 250 mm. The width of the rolled strip, depending on the supplier of the coiled steel and its cutting on the slitting unit, is 3 Г5, 322 mm. The length of the central part of the working section f is constant and, depending on the width of the rolled strip, is 0.965-0.995

50 of its width, 310 mm. The length of the annular groove of the working area, 2 27.9 mm (taken 28 mm). The diameter of the central part of the working section of the roll D 250,0 mm. Dia55 meter annular grooves equal to 249.9 mm. The diameter of the support roll is 750 mm. In the areas of the annular grooves of the work rolls, the contact between the work rolls and the support rolls is absent (there is a gap).

The proposed design of the working roll of the rolling stand located in the line of the electric-welding plant provides the shapes and sizes of the rolled strip, which allow to increase the quality of welded pipes (to ensure their compliance with technological tests, reduction of edge displacement defects, etc.), as well as extend the campaign period of the work rolls between

Editor G. Volkova

Compiled by A. Nebogatov Tehred L. Serdyukova

Order 4746/9 Circulation 783 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Ra vice embankment, 4/5

Production and printing company, Uzhgorod, st. Project, 4

transshipment with the possibility of podshifikovki them during rolling. Improving the quality of pipes and reducing equipment downtime reduces the metal consumption for their manufacture and improves the performance of the pipe-welding unit.

The use of the proposed technical solution is possible on continuous pipe welding machines, in the line of which there is a rolling mill.

FIG. 2

Proofreader L. Patay

Claims (1)

ROLLING CELL OF A PIPELINE ELECTRIC WELDING UNIT, consisting of upper and lower rolls, each of which consists of a cylindrical barrel, which has single and working sections, and necks, the diameter of which is smaller than the diameter of the barrel, characterized in that, in order to reduce the number of transshipments and improve the quality of welded pipes , on the peripheral parts of the working section adjacent to the blank sections of at least the upper roll, annular grooves are made with a length equal to 0.07-0.09 of the length of the working section and with a diameter smaller than the diameter of the rest roll barrels by <0.04-0.05%. > 3 S FIG. f Yu sl sl No. OE S £