DE694017C - Process for the production of end collars on pipes by upsetting by means of rollers - Google Patents

Description

Process for the production of end collars on pipes by upsetting by means of rollers In the pipeline and apparatus suite the collars have so far been pre-welded in most cases, since the manufacture of a collar from the hollow body itself was very difficult and expensive. In, Ge forged hollow bodies the Ausbildlung a Federal from the hollow body itself is very simple, by at the ends of the hollow body to the federal government at the blacksmith., Cn are allowed. In the case of smaller, seamlessly rolled, drawn or welded hollow bodies, the collars were usually upset using a Hohzointal press. On the other hand, with larger hollow bodies v011 400mm in diameter and above, tapping using a horizontal press is, as already mentioned, very difficult and costly, because firstly, very heavy presses are required and secondly, new dies are required for every diameter and every wall thickness Pieces are more expensive than the product itself. For this reason, larger hollow bodies have been pre-welded almost through the collars.

It has also already been suggested that upsetting. of collars on pipes by pressing the pipe ends against corresponding counter bearings by rolling. These methods have JE but the disadvantage that also HIEX for each pipe diameter new thrust bearings are needed.

The idea of the invention provides for upsetting collars exclusively by means of rollers. Here, the process illustrated in the drawing in Fig. 5 is known, according to which, when using the rollers according to Fig. 6, a thickening (Fig. I) inevitably arises, which is uniform inwards and outwards. By appropriately designing a horizontal pair of rollers and a vertical roller, it is possible to produce upset collars, as required in pipeline and apparatus construction.

Fig. 7 shows such a rolling mill.

The hollow body is clamped firmly in a driven face plate which can be moved horizontally. By moving the ho, iizo, ntal # valzen in Fig. 7 , the bead produced with the tool 6 is first pressed outwards (Fig. 2). Once this work has been done by the horizontal rollers, the hollow body is pressed against the vertical roller by the process of the face plate, so (let the rounding disappear. A collar is created as shown in Fig. 3, which can be machined, for example, as shown in Fig. 4 reproduced form receives.

A particular advantage of producing collars in the manner described is that for all diameters, e.g. B. from 40o to 3200 mm, only one roller set is required. If the wall thickness changes so much that a higher and thicker collar is also required, only the upper horizontal roller needs to be replaced.

The vertical edging roller is expediently made as small as possible, so that with very low horizontal forces acting on the face plate and the rolling mill, it is already a good one; Upsetting is achieved.

Even 1-lohll,: bodies made from harder workstones, for which the pre-welding of collars was previously not possible, because weldability with these materials could not be guaranteed, 'can be provided with collars according to the new inventive concept and can now be used for pipelines and apparatus Find.

Claims (1)

PATENT CLAIM * Process for the production of end coils on pipes by upsetting by means of rollers, characterized in that first a bead without edges is upset on both sides of the pipe end and this is then pressed outwards by means of a correspondingly profiled roller pair with adjustable inner roller and with. a smooth roller that is perpendicular to this pair of rollers is rolled to form a collar.