DE169853C - - Google Patents

Description

IMPERIAL

PATENT OFFICE

CLASS la, ■ ν

. 'V

When rolling out perforated blocks on a mandrel into seamless tubes and the like by pilger rolls, a collar or a sleeve somehow attached to the mandrel was used as a bearing for the cooked block in order to fix its position on the j) orn and to push the -! ' They must be secured from the free end of the dome under the influence of the rollers. In \ rolling mills with rotating rollers has I nan also been proposed, the hollow-I) lock to hold it by a constriction, or by \ ^r oil liges closing on the front end \ 'dome. The latter type of fastening should be used for a roller r [i] in which the mandrel with the block is pulled through the rollers ί, tired.

i _; For rocker mills, the latter L \ can .rt not use the block fixing, I .enn here it comes down to that of; Is \ learning block auszustreckende pipe over the "ree mandrel end deported of time, the block forms as a result of its forward or closing erengung overall ^accordingly; a cap, as it were, it can only be secured on a solid block in a direction which is the opposite of the direction in which the pilgrims are subjected to the stress It is important to make a pilgrimage just for '-; cu the beginning of the rolling out that the Vcrkstück, - i.e. the hollow block, on the i.jorn, in both directions i \'. ' ^: . ■ - ■■ "' ■■■. '' ■■ ". · '- · ■■■ .-. ■

\ r

is held. For practical reasons, the diameter of the block cavity must always be slightly wider than that of the mandrel and, if the workpiece is not held in place, the pilgrim rollers first fling the workpiece back and forth on the mandrel until it is correct from the rollers For this reason, the one-sided fastening of the workpiece by pulling in a cap-shaped part of the workpiece protruding beyond the actual mandrel cannot be used for working in pilger mills. But the above-mentioned collar on the mandrel, already used in pilger mills, has not proven to be sufficient Once ¹ the collar can hold the workpiece in only one direction, so that it does not prevent the workpiece from being thrown back and forth at the beginning of the rolling: and secondly, the Bu'v: ¹ or any at all proves to be held on 1. '■' ■■ ·. Hollow body in one direction on the mandrel attached thickening as an obstacle to the full constant rolling out of the hollow body, since the thickening, when the rear part of the hollow body or block was rolled, also easily got between the rollers and the; The caliber in the barrel is damaged or broken. ' Interruption of work.

The present method avoids the use of collars or thickenings! of the thorn ■ respectively. the application of

, "Powder limiting pieces on the latter, putting a horn with one or none Notches are used, in which d; t * material of the to be rolled S hollow blocks ■ Jhiiicingcdriickt. While After rolling out, the mandrel and VVcrk-Muck form a coherent one, so to speak fixed 'bearing. Nevertheless, the removal of the workpiece from the mandrel is without difficulties to perform if you only have the Notches designed accordingly. This mentioned union between Dorn and Workpiece can either be made on the rolling mill itself or separately from it will. In the latter case it is for a non-stop working Rolling mill prerequisite that several mandrels are present, which alternate on the Rolling mill respectively a feed device

»O of the latter should be attached. The new In addition to rolling, the method can also be used for drawing hollow bodies. The union of the workpiece with the mandrel can be done in various ways bring about. The union can be done both by hand and by machine Effect facilities.

On the drawing is shown in Fig. 1 z. B. a known pilgrim step rolling mill is shown in which a mandrel α is attached to a spindle b , which latter is mounted between springs c in a slide d. The carriage d rests on the bed e, and is moved on it with the mandrel against the whale-zcn /, which swing back and forth in a known manner and carry any caliber. The workpiece g, a thick-walled, perforated block, which is to be rolled into a thin-walled tube, is pushed onto the mandrel.

Fig. 2 shows the rear end of the dome drawn out on a larger scale. The mandrel α is provided with an annular constriction α ¹ , which shows the shape of a right triangle in cross section. ^{The surface α 2} lying at an angle of 90 ^° to the axis of the dome serves as a pressure surface for the workpiece g, ^{which is pressed into the channel α 1} at its rear end £ "'.

50 'The front inclined or conical surface of the constriction α ¹ holds the workpiece firmly against movements that are aimed at pulling the workpiece off the mandrel, and if this cone is kept as steep as possible, it does not make any significant difficulties afterwards thin-walled tube to pull the stretched workpiece off the mandrel, the rear drawn-in part of the tube expanding on the Kcgclfläche.

, To push the end of the block g * into the

Well a ^x can find a tong-like device ago · use, the m l / ig, ι on the bed C, and is indicated on the front thereof while '■ end. The device essentially consists of two jaws / ^; (see. Fig. 3), which can move in the frame: against each other. At the same time; early movement of the two jaws can be used irgonr ί a device; an example liicrfü; has not been shown for the sake of simplicity.

Fig. 4 shows a section through the Gc \ stell i and the jaws ft ... The latter sint | designed so that they press the material of the rear hollow body cndcs into the annular recess α ^λ in the selected shape of the annular notch of the dome, which can be seen in FIG. 2. '; |

Carrying out the jaws like as au Fig. 5 can be seen, it can be fo at geeignetci ■ dimensions of the mover. i use the mandrel the jaws not only to unite the workpiece with the mandrel but also to sharpen the former, which, as is well known, facilitates the introduction into the roller or the gripping of the workpiece by the rollers. Since the caliber 'ft ^{1 of} the jaws is used to press the metal into the notch de Dorncs, the caliber / 1 ² , on the other hand, causes di, sharpening. The workpiece g will then! first, as FIG. 6 shows, brought with its before the end between the jaws / 1, whereupon they are pressed together. The caliber ft ² creates the point corresponding to its shape. If the jaws are then moved apart again, the mandrel with the workpiece is advanced further until the position of FIG. 7 is reached; is. Then the cheeks close again; together, they press the rear part g * of the workpiece into the ^{with a caliber Λ 1.} annular recess α ¹ into it. '^;

As already mentioned, the new process is: not only to the application of waltz: and in particular not restricted by pilgrim rollers. If the method z. B. in so-called continuous rolling mills; turned, the first pair of rollers can there pressing the material into the Einkerbuti i effect of the cathedral. j

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Claims (1)

Patent claims: \ - ι. Method of fastening vo: hollow blocks on mandrels to make the same ii Walz'r or drawing works! characterized in that the stupid at its rear end in such a way ii provided on the mandrel recess tingc is pressed in that he is in Rieh pf the rolling process can be pushed off without learning, while its rear part is secured against movement in both directions on the mandrel. ■■■ .- ■■; 2. Device for carrying out the / method; according to claim i, characterized in that the end (g ^l ) of the block (g) by tapered calibrated jaws (ItJ in 'one or more on the (α) existing Vcjiticfiiir ^ ci'i (a ¹ ) is moved. '' - '%' U '*''' //. Thorn () is pushed in. '-'- Vo '</ ■ ■ 3. Apparatus according to claim 2, 'dri-y /. characterized by the fact that the jaws (h) * two in opposite directions 15; have tapered calibres (h ¹ and It ² J , of which the second caliber (It ¹ ) points the hollow block (g) at the front end in order to facilitate its introduction into the rollers or the drawing caliber . ao In addition 1 blue drawings. BEBLlH. THE KEICIISDRUCKEREI HUCKT. ι '·