SU626852A1 - Apparatus for preparing tube ends prior to drawing - Google Patents

Description

The invention relates to pipe production, in particular to devices for the preparation of pipe ends before drawing.

A pipe processing device is known, comprising a hopper stand, a movable carriage for a workpiece task, a movable carriage with a mandrel located on the output side of the stand 1.

The disadvantage of such a device is frequent pipe breaks and a decrease in yield.

The aim of the invention is to reduce the breakage of pipes and reduce yield.

The goal is achieved by the fact that the carriages on the offered device of the device are kinematically interconnected.

In addition, the kinematic link of the carriages is made in the form of drive-tight, tightly coupled spindles with different thread pitch.

FIG. 1 shows a kinematic diagram of the device; in fig. 2 - section A-A of FIG. one.

In the frame 1, in the middle part, the drive roller cage 2 is disposed with three deforming rollers 3 and a corrugated holding sleeve 4 fixed in a centering device 5 installed in a roller cage on sub-holders.

On the upstream side of the razmep 1en carriage 6 to push the pipe 7 into the zone of action of the rollers 3 during the forward course and remove the pipe 7 during the reverse course. The clamping of the tube 7 in the carriage 6 is carried out by a wedge feed cartridge 8, the wedge of which is moved by means of a lever mechanism 9 driven by a pneumatic cylinder 10. The carriage 6 is moved

screws 11, synchronously rotated in the nuts 12 electromechanical actuator 13.

On the output side of the device, a carriage 14 is placed, in a holder 15 of which a cylindrical mandrel 16 is fixedly mounted. The carriage 14 is moved by two rotating screws 17 and nuts 18.

Claims (2)

The screws 17, which are rigidly connected to the screws 11 by means of the sleeves 19, are made with a greater pitch than the screws 11. As a result, the carriage 14 is always moving forward and backward in synchronization with the carriage 6, but with greater speed. The device also includes a guide sleeve 20 and an actuator 21 for expanding the roller stand 2. The device operates as follows. The roller cage 2 before the task of the next pipe is in the mode of filling rotation with a speed of 30-50 rpm. The end of the tube 7 lying on the supplying roller table, the setting rollers (not shown in the drawings), through the guide bush 20, the opened feed cartridge 8, the carriage b and the corrugated sleeve 4, locked by rotation, is fed into the roller stand 2. After the front wheel touches the end of the pipe 7 with the ridges of the deforming rollers 3 clamp the pipe 7 with the pneumatic cylinder 10 of the feed cartridge 8 and start the movement of the carriage 6 and the carriage 14 which is kinematically connected with it. At the same time, the rotation speed of the roller stand 2 is increased to the value of the working speed oh 200-400 rpm At the same time, the end of the pipe is reduced by the ridges of the rollers 3 on the inner diameter and then thinned along the wall by 15-20%, and the reduction on the wall is carried out on a cylindrical mandrel 16, the end of which at the initial moment was in front of the ridges + P, where K is the advance factor equal to or greater than one; X — stretching; L is the length of the prepared end of the pipe; P - residual overlap equal to 40-50 mm. With a steady deformation process, axial friction forces act on the contact surfaces in the direction of the pipe feed; on contact with rollers 3 by setting an appropriate feed angle, and on contact with mandrel 16 by moving it at a speed equal to or exceeding the speed of movement of the outgoing end of pipe 7. After exiting the pipe 7 from the deformation, L) drive 13 carriage feed b stops and reverses without a pause. At the same time, at the time of reversal of the feed drive, the drive mechanism 21 of the rotation of the roller stand slows down to filling speed. After reversing the carriages 6, the end of the pipe 7 is withdrawn from the deformation zone at an increased rate. In this case, the rollers 3 will leave shallow screw holes on the surface of the prepared end, which will further contribute to better holding the prepared end of the pipe in the drawing arms. After the carriages 6 have returned to their original position, the feed cartridge 8 is turned off and the tube 7 is returned by the drive rollers to the feeding roller table. After removing the treated pipe from the supply roller table, the next pipe is fed to it and the working cycle of the device is repeated. At the accepted speeds of movement of the carriages, the working cycle of processing the end of a pipe with a length of 200-300 mm is 30-45 seconds. When processing on installation of pipes, for example with a diameter of 50-120 mm, it will provide significant saving of time and labor costs. In addition, due to wall thinning, a saving in weight of the cut pipe end can be obtained, equal to 15–20 ° / o, which is also significant, especially when obtaining pipes from scarce materials. Hereby, due to the work hardening, upon deformation, the prepared end is obtained to be uniform and strictly coaxial with the original pipe billet. This reduces breakage when dragging. Claim 1. A device for preparing pipe ends before drawing, including a roller stand, a movable carriage for the workpiece task, a movable carriage with a mandrel located on the output side of the stand, characterized in that, in order to reduce the breakage of the pipes and to increase the yield, the carriages interconnected. 2. A device according to claim 1, characterized in that the kinematic connection of the carriages is made in the form of rigidly driven driving propellers having a different thread pitch. Sources of information taken into consideration at the examination: 1. USSR Author's Certificate, NO 174590, cl. B 21 B 17/04, 1964.