DE521445C - Process for the production of pipes with inwardly thickened ends - Google Patents

Description

Process for the production of pipes with ends that are thickened inwards To produce pipes with inwardly thickened ends, there are already different ones Procedures and facilities used. First of all, you have the inwardly thickened ones Ends on a pipe with the same wall thickness produced by upsetting. It is It has also been proposed that the inner thickening by rolling, in fact in the pilgrimage, to produce in such a way that the pilgrim's thorn is set down in front, d. H. corresponding thinned, and the wall on this side of the pipe is immediately thickened. For thickening of the other end of the pipe, the other end of the pipe has been warmed up again and over a correspondingly thinner mandrel is rolled inwards and thickened.

The pilgrim's head made during the pilgrimage has also been used and this pulled in under the hammer via a corresponding mandrel by impact.

Using a different method, tubes were placed on both of them in the pilgrim framework Sides thickened and finished-rolled to the outside and the thickening then through again Hammer effect in the die, as described above, drawn in via a mandrel.

Also by cold drawing using a die and profiled Dorn, such internal thickenings of the pipe ends have been made.

The disadvantages of the known methods are that they are cumbersome, are time consuming and therefore expensive. If, for example, the thickened ends are piled down, thus, in this step-by-step process, unnecessary deformation occurs due to the spreading on. Machining on the pilger mill definitely requires one too Mandrel that is not required for skew rolling.

When forging down, the pipe receives the same damaging deformation as with the pilgrimage and also at the rear at the transition in the outer diameter one Constriction wreath from which the material is carried along when the thickened wall drains will. Defective pipes are the result.

The invention avoids the disadvantages mentioned and enables in The shortest possible time to produce tubes with inwardly thickened ends in that the pipe ends initially thickened outwards by inclined rolling with or without application a mandrel are rolled inside. Here, a constriction of the outer occurs Diameter because the process is a continuous one. The heads and the wall in the thickening will be evenly round. The machining is a uniform, due to the same roller pressure on the entire scope of work, which is not the whole thickened part needs to be worked on at once, but gradually starting from the beginning The rolling down gradually worried about the working length progressing.

A facility is -% - preferably used to carry out the procedure used, in which the rollers or rollers are rotatably mounted accordingly. on the drawing shows a device suitable for carrying out the method.

The device consists of a holding or clamping device n for the pipe to be machined b. This jig can be like a vice or clamping chuck designed to prevent the tube from rotating.

There is also a roller head which is only indicated schematically in the drawing c provided, in the rolling rollers d, preferably interlaced, are stored. By doing Head is also mounted a mandrel e, on which in the example according to Fig. I and 2 a Stop ring f sits.

The vice a or a similar device is used with the am End heated pipe against the rollers d guided so that the pipe end between the Rolling occurs, which then automatically through their inclination when the roller head rotates Roll the pipe down progressively until it touches the attachment point f (Fig. 2).

The withdrawal from the mandrel e can, if, as in the example, a The mandrel is used by moving the vice accordingly The direction of rotation of the roller head is reversed.

The position of the rollers can be chosen so that the pipe at the rotation of the roller head is drawn into the rolling device or rolled out of the same will.

To do this, the rollers must be supported by known means during insertion of the tube can be opened to the stop and closed again for rolling. The closing can take place automatically during the rolling process. By the example according to Fig. 3 the stop ring f is omitted, the heated pipe is with his outwardly thickened end pushed up to the roller head. The rolling down takes place now with a movement of the pipe outwards from the roller head, like the Arrow points. The rolling rollers have the opposite inclination accordingly to that according to Fig. i and

Claims (3)

PATENT CLAIMS: i. Process for the production of pipes with after ends thickened on the inside, with the pipe ends initially thickened to the outside are brought inside, characterized in that the inward rolling of the thickened Pipe ends by skew rolling, e.g. B. a roller head with appropriately profiled Rolling takes place with or without the use of a smooth mandrel. 2. Device for carrying out the method according to claim i, characterized in that a mandrel (e) with stop ring (f) is provided in the roller head (c), against which the pipe end to be machined is supported. 3. Device according to claim 2, characterized in that that the rolling rollers (d) are inclined so that they when. Roll the pipe either pull it into the roller head or feed it out of the roller head. d .. Device according to claim 2 and 3, characterized in that the rolling rollers so are adjustable that they are automatically opened and closed can.