SU500826A1 - Roller for pilger rolling tubes - Google Patents

Description

one

The invention relates to pipe production, in particular to the rolling of pipes in pilger mills, and relates to the improvement of the roll profile.

The metal deformation during pilger rolling of tubes is carried out in rolls having a stream with an effective cross-section. Mill productivity, roll resistance, quality of rolled tubes and other technical and economic indicators of the process largely depend on the stream profile. The cross-section of the roll stream is a semicircle of variable radius with straight or radius outlets.

Rollers for pilger rolling of tubes are known that contain a stream along its circumference with a decreasing lop-cross section, whose profiles have a semicircle with cross-section in the cross-section, and on the arc from 0 to 35-45 °, the stream runs straight.

However, in the known rolls for pilger rolling of pipes, especially when rolling

thin-walled pipes with a ratio of 40,

the cross-sectional profile of the stream does not ensure uniform distribution of the strain value along the circumference of the working sections of the roll stream, which leads to

stability profile of the pipe and reduce the accuracy of rolled pipes.

The purpose of the invention is to improve the accuracy of rolled tubes by reducing the non-uniformity of deformation along the length of the working part of the stream of rolls.

This is achieved when using roll piluoii for rolling tubes, a roll containing its circumference with a decreasing cross section, the profile of which is made in the form of a semicircle with outlets, and on the arc from 0 to 35-45 °, the straight channel leads and the cross section profile of the stream on the arc from 35-45 ° to 105-150 ° has issues,

made up of an arc of a larger radius than the radius of the semicircle brook, and a tangent to it, and on an arc from 105-150 ° to 150-200 °, the outlets are made in the form of an arc whose radius is 1.02-1.04 greater than the radius of the semicircle brook.

FIG. 1 shows a roll for pilger rolling of pipes, general view; in fig. 2 shows a section along A-A in FIG. one; in fig. 3- section but bb on phi, g. 2; in fig. 4 is a section along BB in FIG. 2; in fig. 5 - section

according to YY in FIG. 2

ValoK for pilger rolling contains a stream 1 around the circumference, which has working QP and idle QX sections. The work area in turn has an arc of a circle

65-125 ° Qoq of the striker, on the arc of a circle 65-115 ° - the polishing zone of Qn and the arc of a circle of 10-30 ° - the zone of the longitudinal release QB. The idle stream is determined by the formula

Q, 360 - (Qe + Qn + QB).

The cross-sectional profile of the brook is made in the form of a semicircle with a radius of r, with outlets defined by the angle a. Moreover, the outcrops from 0 ° to 35-45 ° (see Fig. 3) are made in the form of Direct 2, and the angle on this part of the stream has a variable value, decreasing from 30-40 ° to 25-35 °. On an arc from 35-45 ° to 105-150 ° (see Fig. 4), the issues are composed of an arc drawn with a radius TI greater than the radius of the semicircle g stream, and tangent 3 to the arc with radius g, and the angle of release on this arc characterized by a variable value and a variable ratio, the radius of release G to the radius g

semicircles with a gradual decrease in this ratio from 1.05-1.07 to 1.02-1.04. On a creek arc, from 105-150 ° to 150-200 ° (see Fig. 5), the outlets are made in the form of arc 4, the radius G2 of which is 1.02-1.04 greater than the radius r of the semicircle and is characterized by constant values mi the angle of the transverse release and the ratio -.

When rolling a pipe, a section of a roll of rolls on an arc from 0 ° to 35-45 ° carries out in the seed mode the end of the liner and the formation of a pilgrim head (not shown), and at a steady process, a stable capture by transverse outlets. The section of a stream of rolls on an arc from 35–45 ° to 105–150 ° forms the profile of a pipe in such a way that the displacement of metal in

The transverse direction and the loss of stability of the profile are increasingly constrained by the increased part of the transverse-release arc. A section of a stream of rolls on an arc from 105-150 ° to 150-200 ° is carried out by rolling - polishing the pipe with a slight movement of metal in the transverse direction. The use of the proposed roll makes it possible to significantly improve the quality of rolled tubes by reducing the non-uniformity of deformation during rolling, especially in the cross-sectional zone and in the polishing section, and increasing the stability of the profile of the deformable tube. Such rolling conditions provide an increase in the permissible value of the metal feed in rolls and, consequently, the mill productivity. Gradual

 ri, a reduction in the ratio over a section with an angular length from 35-45 ° to 105-150 ° allows an increase in the accuracy of the pipes rolled on the mill.

Claims (1)

Invention Formula Roller for pilger rolling of tubes containing a stream along its circumference with a decreasing cross-section, whose profile is made in the form of semicircles with highs, and on the arc from 0 to 35-45 °, the outlets are straight, differing in that rolled pipes, the cross-sectional profile of the stream on the arc from up to 105-150 ° has issues made up of an arc of a larger radius than the semicircle radius of the brook, and tangent to it, and on an arc from 105-150 ° to 150-200 ° degrees, the outlets are made in the form of an arc whose radius is 1.02-1.04 larger than the semicircle radius brook - FIG. Have A 6-B W. 6-. fugues 2 S-8 gd srig