SU1148666A1 - Mandrel for reducing tubes - Google Patents

Abstract

EDGE FOR ROLLING A TRUV with a folded seam, mainly coated on the inner surface, in the rolls of the stands of the roll forming mill, containing a working rod with a calibrating section and a shank, characterized in that, in order to expand technological capabilities by increasing traction, it is provided with calibrating and traction rollers placed eccentrically to the axis of the mandrel with the possibility of free rotation in the grooves made on the working rod, while the traction rollers are offset relative to the axis of the In the direction opposite to the displacement of the forming and calibrating rollers, the latter are placed one from another at a distance corresponding to the mill spacing between the mill, the traction rollers are located midway between them, the forming section located between the shank and the calibrating section is made on the working mandrel rod The eccentricity of these rollers is determined from the ratio of DO-DI where DB is the diameter of the gage part 4i of the mandrel; 00 9d 9d 9 D, - diameter of the working rod. / 4/2 -. . / I .. .- -A. . I p (I I / N1 I I / J. 7 L Fig. /

Description

I

The invention relates to the processing of metals by pressure, in particular to the equipment for the profiling of pipes with folded seam on a bending mill.

A known pipe mandrel for crimping pipes, preferably with a folded seam, in rolls of a roll forming mill, contains a working rod with a cushioning section, made with diameters corresponding to the internal diameter of the pipe, and a shank Ci 3.

A disadvantage of the known mandrel is the presence of a significant force of the profile and the mandrel, which is superior to the thrust, developed by the rolls, which leads to jamming of the finished pipe on the outlet.

The purpose of the invention is pacnoipeHHe. technological capabilities by increasing traction

The delivered target is achieved, TeMs O71ravka for the compression of pipes with a folded seam, predominantly with a coating on the inner surface, in the rolls of the rolls of the roll-forming mill, containing a working rod with a calibrating section and a shank are equipped with a forming, calibrating and pulling rollers 1–15 disposed-eccentrically Frame Axes with free rotation c. grooves on the working rod, while the pulleys are shifted relative to the axis of the mandrel in the direction opposite to the displacement of the forming and calibrating rollers, the latter are placed one from the other at a distance corresponding to the intercellular distance of the mill, the pulleys are located in the middle between them, - on the working core of the mandrel there is a shaping section located between the shank and the calibrating section, and the eccentricity value of the said rollers is determined from the ratio

17-7 P Pi

7 ,,

where DO is the diameter of the gage part

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D diameter of the working rod. Figure 1 shows the mandrel, the general view in figure 2 is the same, view of the sheet xyj in figure III is a section A-A in figure 1 (with forming rolls); on

8666I

figure 4-section bb in figure 1 (with an auxiliary roller in the space between the rollers).

The proposed mandrel contains 5 working core 1, consisting of a calibrating part 2, anterior, forming part 3, necessary for stitching the pipe 4, and a roller-containing core 5 with grooves 6, in which the lean 7s calibrating 8 and t are mounted eccentrically to the axes of the mandrel bend 9 rollers and shank 10, consisting of a landing collar 11, a guide pin 12, a threaded key

5 of the element 13 and the nuts 14 with the collar. The calibration part 2 is located in front of the rollers 15 and 16, the shape is the final contour of the pipe 4 with the seam 17. The form of roller 7, 15 and 16, in the groove 6 is located forming roller 7, mounted on rolling roller 18, with rotation on axis 19 ; locked with screws 20

5 Under the next caliber

wagons of the profile mill (not shown, at the spacing distance 6 (in the corresponding grooves 6 of the roller-containing rod 5, the wedge with the I-ecrissor gauge rollers 8 are pa by pshpinnik 18, similar to the forming core 7.) The grooves b are located in the working rod 1 coaxial pipe 4, which is the folding seam 17. In the interspace of the Melsd, pairs of rollers are coaxial with the seam 17 of the pipe 4 in the corresponding grooves 6 at a distance b from the axis of the rolls

 diametrically - ex0.

The centerpiece of E. is located on traction pojrHKH 9 on the underplice 18, which, when operated, is in contact with auxiliary drive or non-adhering rollers 21 fixed on the frame of the roll forming mill (not shown).

The working part of the traction rollers 9 is made in the form H1bn.i of the inner part of the pipe 4. The diameter D of the roller-containing rod 5 is smaller than the diameter Dp of the calibrating part in the following ratio

Do- d,

g

where i

eccentricity of the traction rollers relative to the axis of the mandrel.

Claims (1)

Mandrel for crimping pipes with a seam seam, mainly coated on the inner surface, in rolls of stands of a roll forming mill, containing a working rod with a calibrating section and a shank, characterized in that, in order to expand technological capabilities by increasing traction, it is equipped with a forming calibrating and traction rollers placed eccentrically to the axis of the mandrel with the possibility of free rotation in the grooves made on the working rod, while the traction rollers are offset relative to the axis of the mandrel in the torus, which is opposite to the displacement of the forming and calibrating rollers, the latter are placed one from another at a distance corresponding to the straddle distance of the mill, traction rollers are located in the middle between them, a forming section is placed on the working rod of the mandrel located between the shank and the calibrating section, and the magnitude of the eccentricity of these rollers is determined from ratio e? where D _fl is the diameter of the calibrating part of the mandrel; D _n - the diameter of the working rod. ZhP TIS