SU766681A1 - Cold tube rolling tool - Google Patents

Description

(54) TOOL FOR COLD PIPE ROLLING

one

The invention relates to the field of metallurgical pipe production, and more specifically to a tool for the production of cold deformed pipes, and can most effectively be used in cold rolling mills with variable cross section calibers for the production of long pipes rolled into a coil directly in the mill line during the rolling process.

A well-known tool for cold-rolling pipes, comprising successively one pair of rolls with strands of variable cross section and one or two pairs of rollers with a constant cross section of a brook supported on strips of variable height 1.

The disadvantage of this design lies in the fact that the second (third) group of calibers is open, which eliminates the possibility of significant deformation along the diameter and thus does not ensure pipe rolling along existing routes for mills with a variable cross-section.

From the known tool for cold rolling of pipes, the closest in technical essence to the proposed is a tool containing two successively arranged mutually perpendicular pairs of rolls, each of which has on a barrel a stream of variable cross section with working zones of equal length, each of which a pair of rolls deforms the pipe in its section, which is equal to the length of the working stand,

 corresponding to the length of the sweep streams 2J The disadvantage of the known construction is that only part of the deformation zone is common to both pairs of rolls, therefore in the area where the pipe is subjected

The Q deformations of only one pair of rolls during rolling without turning the tube will lead to sunsets, leading to a decrease in the surface quality of the rolled tubes.

The aim of the invention is to increase the surface quality of 15 pipes.

Claims (2)

To achieve this goal, a tool for cold rolling tubes containing two successively arranged mutually perpendicular pairs of rolls, each of which has on a barrel a stream of variable cross section with working zones of equal length, according to the invention, the length of the non-working zone roll stream of second pair more than the length of the non-working zone, the stream of rolls of the first pair is by the amount distributed between the pairs of rolls. Such a constructive execution of the tool for cold rolling of pipes will make it impossible to roll the pipes without turning relative to the rolls, maintaining the high quality of the pipe surface by combining the beginning of the deformation zone of the first (horizontal) and second (vertical) roll rolls. FIG. 1 shows a tool in the working stand of a cold-rolling mill; a longitudinal section; in fig. 2 - horizontal roll (first) pair in the process; in fig. 3 - a roll of vertical (second) pair in the process of work. The tool for cold pipe rolling contains two mutually perpendicular pairs of horizontal rolls 2 and vertical rolls 3 in case 1. Rolls 2 and 3 have barrels of ring gauges, respectively, of streams 4 and 5 of irregular cross-section with working areas a, and a wives nostn and non-working areas. The non-working area of each roll has an area B, at the KT (jpoM feeds the workpiece, and section 0 where it is skipped. The non-operating area of the second (vertical) pair of rolls is longer than the non-working area of the first roll ( horizontal) pair by the distance I between the pairs of rolls. The stroke length L of body 1 is equal to the length of the sweep, the gauge of the second pair of rolls. The device works as follows. During rolling, the body 1 of the working stand moves reciprocatingly A. At the same time, the rolls 2 with brooks 4 and the rolls 3 with brooks 5 perform reciprocating motion and deform the workpiece 6. When moving from the rear (left) extreme position of the rolls 2, i.e. with the workpiece (section 6), the workpiece is fed by a feeder (not shown) to the working area (to the working cone of the mandrel 7). Rolls 2, capturing a portion of the metal fed to the deformation zone, deform it. In this case, the rolls 3 from the rearmost (left) position move with the rolls 2 along the section and section b. The diameter of the stream 5 calibers of rolls 3 is made larger than the diameter of the workpiece and the deformation of the pipe in these areas does not occur. Having reached the beginning of the working zone, the rolls 3 capture the workpiece and deform it. Thus, during the full stroke of the working stand, which is equal to reamer, the roll 5 rolls 3, the workpiece in the work area section is subjected to deformation by both pairs of rolls, i.e. the deformation zone is common for both pairs of rolls. The proposed tool for cold rolling prevents the formation of rolls on the pipe when it is between the pairs of rolls and thereby improves the surface quality, as well as ensures the rolling of quality pipes without turning them relative to the rolls and thereby making it possible to roll the pipes without twisting them. in a non-rotating bay. Claims An instrument for cold-rolling pipes comprising two successively arranged mutually perpendicular pairs of rolls, each of which has on a barrel a stream of variable cross-section with working zones of equal extension, characterized in that, in order to improve the quality of the pipe surface, the extent of the non-working zone the stream of rolls of the second pair is greater than the length of the non-working zone; the stream of rolls of the first pair is by the size of the distance between the pairs of rolls. Sources of information taken by the VO attention during the examination 1. Author's certificate of the USSR No. 380377, cl. B 21 B 21/00, 1971. 2. German patent number 86162, cl. 7a, 21/00 1896.