DE1088451B - Method and device for the production of sealing cones provided with a reinforcing ring for pipe screw connections on thin-walled steel pipes - Google Patents

Description

In the patent application I 9803 Ib / 7c is a method for the production of sealing cones for pipe screw connections with a reinforcing ring placed on thin-walled steel pipes under protection, which is characterized in that the pipe on a or both ends are first widened in a manner known per se and then likewise in a manner known per se Way, a ring is pressed into the expanded pipe end, in the same operation of the The ring that determines the shape of the sealing cone is expanded by a mandrel and the pipe end is compressed around the ring will. *

The implementation of this process requires an already expanded pipe end, so that for Completion of the sealing cone a total of two operations are required.

The invention aims to simplify this method and this is achieved in that the reinforcing ring itself is used to expand the pipe end and that the pipe end on the Tube end is constricted tapering reinforcement ring. In this way, the individual work processes - expanding the pipe end, Insertion of the ring and compression of the pipe end - in a single operation and with one tool. In addition · results in the special Shape of the reinforcement ring an improved end product, since also the contact surface for the union nut is designed conical, the transition of the tube in the sealing cone section free of sharp Kinking remains and thus damage and weakening of the pipe wall even with frequent loosening the screw connection is largely excluded.

The invention further relates to a device for carrying out the modified method, which has the peculiarity that by means of a connected to an upper die, with conically tapered Pointed dome, the diameter of which corresponds at least approximately to the inside diameter of the pipe, a smaller inside width than the tube having reinforcing ring with a convex shape Outer wall pressed into the pipe section to be deformed and at least approximated in the process is widened to the inside width of the unexpanded tube, while at the same time through the with the Mandrel connected, internally cup-shaped, upper die half in cooperation with the lower die half of the expanded pipe section to the spherical outer half of the reinforcement ring is bent.

The inventive method is based on the drawings, the individual in axial longitudinal sections Show stages of the work process, explained in more detail. It shows

Method and device
for making with a
Sealing cones provided with reinforcing rings for pipe screw connections on thin-walled steel pipes

Addition to patent application 19803 I b / 7 c
(Auslegeschrift 1 083 211) i

Applicant:

International Harvester Company,
Chicago, 111. (V. St. A.)

Representative: Dipl.-Ing. H. Zoepke, patent attorney,
Munich 5, Erhardtstr. 11

Heinrich Hagen, Neuss / Rhine,
has been named as the inventor

Fig. 1 shows the pipe end clamped in a lower die and above that on a mandrel with an upper die added reinforcement ring,

Fig. 2 shows the ring pushed into the pipe end with expansion of the same and the one compressed above it Sealing cone,

Fig. 3 the finished end product released from the device with union nut.

The thin-walled steel tube 1 is clamped in a lower die 3 in such a way that the section 2 to be deformed protrudes over the clamping surface which is intended to limit the insertion of the reinforcing ring 4.
The reinforcement ring 4, which has a smaller inside width than the tube 1, is pushed onto a mandrel 6 connected to the upper die 5. On the side facing the pipe end, the ring 4 is shaped so that its outer surface engages the inner edge of the pipe end 2 when the upper die is lowered.

In the further course of the lowering movement, the pipe end 2 is first pushed in with the reinforcement ring 4 expanded. The ring 4 then also becomes, as a result of the further passage of the dome 6 to at least approximately the same clear width as

009 590/72

brought the unexpanded part of the tube 1. At the same time, the pipe end 2 is pushed through the die halves 3 and 5 compressed around the ring 4.

The pipe end 2 reinforced by the firmly clamped ring 4 forms one without any further aids permanent sealing cone, as shown in Fig. 3 together with the union nut 7.

Claims (2)

Patent claims: 1. Process for the production of sealing cones for pipe screw connections provided with a reinforcing ring on thin-walled Steel pipes according to patent application I 9803 Ib / 7c, characterized in that the reinforcing ring serves to expand the pipe end and the pipe end is constricted on the reinforcing ring tapering towards the pipe end. 2. Apparatus for performing the method according to claim 1, characterized in that by means of a tip connected to an upper die (5) and provided with a conically tapered tip Domes (6), the diameter of which is at least limited., approximates the inside diameter of the pipe (1), a smaller inside diameter than the pipe (1) having reinforcing ring (4) with a spherical outer wall in the to be deformed Tube section (2) pressed in and at least approximately to the clear width of the unexpanded Tube (1) is expanded, while at the same time connected to the mandrel (6), inside cup-shaped, upper die half (5) in cooperation with the lower Die half (3) the widened pipe section (2) is bent onto the spherical outside of the reinforcement ring (4). Considered publications:
British Patent No. 367,419. 1 sheet of drawings © 009 590/72 8.60