DE1222456B - Device for the production of screw sutures consisting of two bands - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B21c

German class: 7b-9/01

Number: 1222 456

File number: Sch 322171 b / 7 b

Filing date: October 20, 1962

Opening day: August 11, 1966

The invention relates to a device for producing screw suturing tubes from two strips with one feed device for each strip on opposite sides of the pipe axis.

For the economical production of screw-seam pipes, taking into account the limited stress on the weld seams, the ratio of the sheet metal strip width to the pipe diameter should not deviate significantly from 1: 1, if possible. Since the bandwidth is set from the upstream of the pipe welding machine strip mill, which is Progr amm pipe production in consideration of the above ratio of 1: 1 very limited. In order to expand the range of existing overall systems for the production of screw seam pipes, it has therefore already been proposed that two or more strips be welded together to form a wider strip before they enter the pipe welding system. As a result, depending on the number of strips welded together before the actual pipe production, the production program can be expanded in an economical manner. However, this type of screw-seam pipe production has the disadvantage that the weld seams connecting the individual bands do not always correspond to the required quality level due to the helical deformation of the bands in the pipe welding system. This deficiency can be circumvented in that all weld seams are only carried out after the bands have been deformed. A known method is available for this, in which two or more strips are fed to a forming tool from one side. However, this results in considerable difficulties in controlling the tape feed, especially if the tapes have to be adjusted relative to one another in the event of fluctuations in the tape widths. This would make expensive, complicated control devices necessary.

The object of the invention is to create a device for producing screw suturing tubes from two strips, in which the inlet angle of the strips can be precisely controlled with simple, operationally reliable means. In order to achieve this, a known pipe manufacturing process is assumed in which the strips are fed from opposite sides of the pipe axis. On the basis of this previously known method, the invention consists in a molding framework with one deformation tool for each band, one of which is a deformation tool above and the other below the pipe device for the production of two
Tapes existing screw sutures

Applicant:

Schloemann Aktiengesellschaft,
Düsseldorf, Steinstr. 13th

Named as inventor:

Dipl.-Ing. Herbert Färber, Ratingen

axis lies. The fact that a deformation tool is assigned to each band, and that too opposite sides of the pipe axis, the bands can be adjusted completely independently of each other and thus obtain the favorable angular position to one another required for the welding process.

A common pivot axis is advantageously assigned to the feed devices. In further Formation of the invention are two welding devices in the deformation framework Welding the inside seams and two welding devices for welding the outside seams for the Case of the welding of an X-seam at the first contact points of the incoming strips arranged with the finished bent strips that the outer seam of the strip entering at the top first, on the lower band first the inner seam and after half a turn of the tube the corresponding one Counterstitched seams are made. This ensures a particularly reliable process for the Manufacturing guaranteed.

An embodiment of the pipe welding system for carrying out the method according to the invention is shown in the drawing.

F i g. 1 shows a plan view of the pipe welding system;

2 shows a section along the line II-II of Fig. 1,

3 shows a section along the line III-III of

The system essentially consists of coil drain box 1, straightening machine 3 with auxiliary driver 2, Cropping shears 4, butt welding machine 5, trimming shears 6 with hem shredding 7, driving device 9, Guide rollers 17, the actual forming frame 11 with the welding devices 12, 13, ultrasonic

609 609/122

testing device 14, separating device 15 and roller table outlet 16.

The bundles 8 α and 18 b coming from the hot or cold rolling mill are placed in the bundle drain box 1 with a crane or lift truck. A stripping chisel 19 strips the strip tongue from the collar that is spinning through the driven rollers 20 and feeds it to the straightening machine 3. The auxiliary driver 2 in front of the straightening machine now takes over the task of pulling the strip off the coil and pushing it through the straightening machine. Cropping shears 4 cut the end of the tape and the beginning of the following tape so that they can be welded to one another in the butt welding machine 5. The tape is guided precisely by side rollers 17 for this purpose.

The band is trimmed in the circular knife scissors 6 and the hem is then trimmed with a cleaver? crushed. Thick strips are beveled in the planing device 8. The driving device 9 pulls the strip through the trimming shears and pushes it into the forming frame 11. Between the driving device 9 and the forming frame 11 there is still a stand 10 which carries vertical and horizontal guide rollers. In the molding frame 11, the strips 18 a, 18 b are formed into a central hollow body by means of bending rollers 21, 22. Immediately after the deformation of the strip 18 α entering the mold frame 11 at the bottom, the inside of the strip edges are continuously welded together at the first contact point 26 and the strip edges of the strip 18 b entering the top of the molding frame 11 after the deformation at the first point of contact 27 are first outside with each other welded. After half a turn of the tube, the band edges of the band 18 a are made at the summit point 27 or below the inner weld of the band 18 b .

In the present example, the welding device works fully automatically according to the “submerged powder system”. In the event of a fault, the entire system is automatically shut down. When starting again a weld pool is formed before the feed starts again, so that there is no error in the Weld seam is created.

The entire facilities in front of the Fonngerüst are on a base 23, which is around a King pin 24 is pivotable below the first welding point and runs on rails 25.

The strip inlet and pipe outlet form an angle that corresponds to the strip width and the Pipe diameter is set. An automatic control ensures through slight swiveling of the Strip feed for a constant welding gap width.

The ultrasonic testing device 14 continuously checks the weld seam and marks any welding defects by splashing paint on the pipe. In the Separating device 15 is finally cut off the continuously emerging pipe to commercial lengths and fed to the test press and the finishing line via roller tables 16 and grates.

Claims (3)

Patent claims: 1. Apparatus for the production of screw suturing tubes from two strips, each with a feed device for each strip on opposite sides of the tube axis, characterized by a mold frame (11) with one shaping tool (21, 22) for each strip (18 a, 18 b) , of which one (18 δ) is above and the other (18 a) is below the pipe axis. 2. Device for the production of screw sutures according to claim 1, characterized in that that the feed devices (23) are assigned to a common pivot axis (24). 3. Device according to claims 1 and 2, characterized in that in the deformation device (11) two welding devices (12, 13) for welding the inner seams and two welding devices for welding the outer seams in the event of welding an X-seam in such a way to the first contact points (26, 27) of the incoming tapes (18 a, 18 b) with the finished bent tapes are arranged that in the case of the incoming tape (18 b) first the outer seam, in the lower tape (18 a) first the inner seam and after half a turn of the pipe, the corresponding counter-seams are made. Considered publications:
German Patent No. 311 233;
German interpretative document No. 1 “04 &253;
German utility model No. 1829 619;
French Patent No. 1177 832;
U.S. Patent Nos. 1031965, 2794409. 1 sheet of drawings 609 609/122 8.66 © Bundesdruckerei Berlin