SU1523228A1 - Flaring tool - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the manufacture of heat exchangers for fixing pipes in the openings of tube sheets. The purpose of the invention is to increase the service life of the roller by reducing the wear of its body and rollers. The device consists of a conical spindle 1 installed in the housing 2, in windows 3 of which rollers 4 are placed at an angle to the axis of the spindle. At the same time, the windows of the housing exceed the length of the rollers by at least 0.1, so that during operation the ends of the rollers 4 do not wear the ends of the windows of the housing 2. 1 Il.

Description

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And: about {) the ateyie relates to the processing of meta; 1./1 () in pressure and can be used for the flaring of pipes in tube plates of heat exchangers.

The purpose of the invention is to increase the service life of rolling by reducing wear of the body and rollers.

The drawing shows the rolling, general view.

Rolling consists of a conical spindle 1 installed in housing 2, in windows 3 of which roller rollers 4 are retracted at an angle to the axis of the spindle. Rolling is installed in pipe 5 before it is fixed in a tube sheet b.

Rolling works as follows.

3. The moment of installation into the tube, the rollers 4 are placed in position A, i.e., in the upper part of the windows 3 of the housing 2. During operation, the spindle I is rotated. Since the spindle 1 is in contact with the rollers 4, the latter also begin to rotate and roll around the inner surface of the pipe. Due to the development of rollers 4 relative to the axis of the spindle 1, the rollers tighten the spindle, moving it in the axial direction. The spindle at the same time pushes the rollers, which deform the pipe in the radial direction. At the same time, the rollers move in the axial direction along windows 3 (in the drawing downward), the length of which exceeds the length of the rollers. The flaring process ends when a predetermined amount of pipe deformation is reached. At this point, the rollers move iio.:i i; )Ke. B, i.e., in the lower part of the windows ().

For a given degree of deformation of the pipe, materials and dimensions of the pipe and pipe brush, as well as the design of rolling, the size of body windows is determined experimentally, based on the fact that at the final moment of the flaring the rollers with their end surface touch the end surface of the body windows.

For example, for rolling with dimensions: case diameter 28 mm; taper verte0 at 1:20; taper rollers 1:40; the angle of rotation of the rollers relative to the axis of the spindle 2 ° 30 i the average diameter of the spindle is 8 mm; average roller diameter 7.5 mm; roller length 40 mm to achieve a given degree

5 deformation of pipe size 029X2.5 of Art. 10, when fastening it in an opening of 029.2 mm of a tubular lattice of steel 20K, the excess length of the body of the length of the rollers is 10-12 mm.

Excess length of hull windows

Roller 0 allows, in the course of operation, to exclude contact between the end surfaces of the rollers and body windows, and therefore, to eliminate wear of these surfaces, thereby increasing the service life of the rollers.

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Claims (1)

Invention Formula A roller containing a conical spindle mounted in a housing with windows, in which rollers are placed at an angle to the axis of the spindle, differing in terms of that. In order to increase rolling life by reducing wear of the body and rollers, the body windows are made with a length dimension greater than the length of the rollers by at least 0.1.