DE800480C - Rolling device for producing annular grooves on thin-walled tubes - Google Patents

Description

The invention relates to a device for producing lUenibran bellows made of thin-walled tube.

The production of folded tubes by rolling or rolling is known thin-walled pipes, which are first pre-corrugated and then in further work steps be re-rolled deeper. The disadvantage of pre-grooving the pipes is (let the deformation of the pipe at the expense of its wall thickness because the material does not can flow laterally.

Around the wall of the pipe, which is already quite thin-walled, if possible to conserve and maintain in their original strength, is according to the invention suggested rolling the grooves through a series of juxtaposed Form rolls, starting from the middle of the factory thickness, so that the rolls one after the other, one after the other from the inside out, come to the engagement. The device has forming rollers attached to levers which are driven by eccentrics or cam disks are controlled, pressed against the workpiece. This eccentric sit on an axis, the rotation of which causes the forming rollers one after the other to counter (read Workpiece are pressed. This makes it possible to have any number of slices at the same time to bring into use, the intervention of the roles according to number, depth and graduation to regulate arbitrarily and above all the material flowing from the outside to the To fetch form site. The disintegration enables relatively deep grooves rolling without major wall thickness reduction, whereby the material is largely protected remain.

In one embodiment, Fig. I shows the device in the view, Fig. From the side and Figs. 3 and 4 the processing steps following Fig. I.

After this sits (read workpiece i made of thin-walled tube on the circumferential Mandrel 2. The forming rollers 3 can be rotated on the bolt 4 in the two-armed lever 13 stored. The levers 13 sit on the axle 5. They are tightened by the tension springs 6 pulled downwards, whereby the rollers are constantly pressed against the cam disks 7 will. These are attached to the axis 8 offset from one another. Go berserk the disk io provided with a handle 9 press the eccentrics 7 one after the other on the lever 13 and thus the deformation rollers 3 against the workpiece i.

According to Fig. I, the middle roller 3 first presses on the Workpiece, whereby the central groove i i is formed. According to Fig. 3 are on the same Way, the two adjacent grooves 12 are rolled in. Fig.4 shows the rolling of the last one two grooves 13.

The deformation of the material takes place from the center of the workpiece beginning, on both sides at the same time outwards. In this way the material becomes Fetched evenly from the outside to the inside and a folded tube without reduction made of its wall thickness.

Instead of moving the roller lever by turning the eccentric from tape, the forming rolls can also be made by other known devices, mechanically, hydraulically, electromagnetically or by compressed air against the workpiece will.

Claims (3)

PATENT TO PRCCIIE: i. Rolling device for the production of ring-shaped running grooves on thin-walled pipes, characterized in that a row Adjacent forming rollers (3) starting from the center of the workpiece, one after the other following outwards, come to the intervention. 2. Apparatus according to claim i, characterized characterized in that the forming rollers (3) are attached to levers (13), which by Eccentric or cam disks (7) controlled against the factory thick (i) are pressed. 3. Apparatus according to claim 2, characterized in that the eccentric on one Axis (8) sit, (by rotating the forming rollers one after the other against the workpiece be pressed.