DE3124957A1 - METHOD FOR PRODUCING IN PARTICULAR MULTIPLE-CURVED PIPELINE PARTS AND PIPELINE PART MANUFACTURED BY THE METHOD - Google Patents

Description

Method for the production of pipe parts with multiple bends, in particular and · β * · πι produced according to the method « Pipeline part.

The invention relates to a method for the production of pipeline parts, in particular multiply curved as a prefabricated part made of straight pipe parts by Bieaen and a pipe part produced according to the process.

Pipe bends with extended legs are particularly necessary in power plant construction. The conventional one Production method of pipe bends allows it to be produced with lengthened Manufacture legs / by adding an enclosed or a required intermediate dimension between two curves is provided in the required length that must be bridged. But this procedure is already because of the 'or. weld seams to be provided difficult as well as expensive and relatively uneconomical.

The known methods are with regard to the design of the pipe bend of the leg lengths and require calculation and measurement because of the straight lengths.

The invention is essentially based on the object of a method for producing in particular

multiply curved pipeline parts as a prefabricated part to create from straight pipe parts, in which spatial angle changes by finished pressed Elbows are made possible and a production simplification and cheaper, in particular through the Saving of weld seams is achieved. '

According to the invention, a pipe part which is straight in the initial state is primarily used to achieve this object between the pipeline parts serving to create the legs or the end legs, the wall of the pipeline part so thickened that it is one for forming a bend by corresponding bending between the end legs are given a suitable wall thickness, the end legs in a desired angular position can be brought to the longitudinal axis.

This means that the manufacture of the manifold is considerably simplified and cheaper: because the summary of the curvature according to the invention and the leg formation make the provision of an intermediate piece for leg formation and the associated with it No need for fitting or welding.

An advantage of the invention also results from the fact that the straight pipe part forming the starting material can have the same dimensions as the straight pipeline routing; because this essentially reduces a fitting work to be carried out when connecting a leg to a next part of the pipeline by welding.

For the production of pipe sections with multiple bends, several, two or three, for bending or for curving certain thickened wall sections in the one between the legs Pipeline part adjacent to each other in a bend or bend to be formed ' correct spacing provided, with appropriate

Leg lengths possible at the ends of each elbow are.

The bending of the following curvatures takes place in such a way that afterwards with the press device open to the first or previous bend after a corresponding further movement of the pipeline part the next one Curvature is pressed.

The formation of the thickened portions to be bent to the bend can be done in such a way that the straight Output pipeline part is subjected to an upsetting process, which results in external deformations to a Wall thickening in the sections to be bent and their pre-ovalization expresses itself. For this purpose, appropriately shaped and split compression sleeves that surround the output pipe section.

Following this process step, the ovalized pipe part to be curved is introduced with the temperature suitable for the material into the shape of the spool to be produced with the help of a die and male die brought.

Here, the pre-ovalized cross-section is the Sections brought into the round cross-sectional shape by pressure in the direction of the main axis of the oval shape.

The drawing explains schematically the implementation of the method according to the invention.

Fig. 1 partially reproduces a multi-curved spool in a longitudinal view.

Fig. 2 allows the production of the thickened sections to be bent in the straight in its original shape Detect pipe part for a multiple elbow.

3 illustrates the pressing of a prepared pipe part into the finished elbow shape.

Fig. 1 shows schematically a multi-curved pipe part, which is designated by 1 in its entirety. The individual curvatures have the reference symbols a and b. You can from the drawing Reproduction deviating have the same lengths and the same radii of curvature.

turned ends of curvature are indicated with c.

When making a multiple, present case Double curved pipe part 1 is proceeded in such a way / that thickened in a straight pipe part 2 Wall points 3 and 4 or sections 3 and 4 are formed at the points that are subject to bending should be. Here, the straight pipeline part 2 is between a fixed bearing 5 and a displaceable one Arranged compression head 6, which is under hydraulic displacement pressure. On through the bends to be made A split compression sleeve 7 and 8 is provided at certain points. The recesses 9 inside the compression sleeves are for the displaced material under the action of the compression head 6 pressure provided so that on the pipeline part 2 thickenings 10 form to the outside. In favor of this Process can be provided in the pipeline part, a core or a mandrel. You can also choose between the Provide bending points detachable guide sleeves to prevent unwanted bulges in the pipeline part impede. At the bending points, the compression sleeves are also designed on the inside so that through the upsetting process results in a pre-ovalized cross-section.

Each curved section is bent in the manner indicated in FIG. 3 with the aid of a male mold 11 and die 12 made, the pressing pressure the male part is applied hydraulically. The pipe section to be bent is heated accordingly brought into the pressing device and for

pressed round cross-section. The legs 13 and 14 of the elbow can be of any length. After bending the first curvature of the pipe Ic is itungsteil moved further, so that the next bending point or the next section enters the press.

The legs of one elbow can be connected to the leg of an adjacent elbow by welding. In the case of a multi-curved pipeline part, one leg of a previous curvature continues in the leg of the following curvature facing it * whereby the next leg of this curvature can continue in the facing leg of a third curvature.

So if a spool has three bends, there will be at least six welds on that spool saved compared to previously known designs. This is also necessary when arranging or placing Supports (suspensions) are advantageous / which are then, because of the missing welds on the Have the prefabricated pool arranged flexibly in terms of geography. In the case of the subject matter of the invention, the amounts to be taken into account are The main costs are the prefabrication, the subsequent tests and the final documentation.

Blank page

Claims (8)

Claims, 1. J A method for the production of pipe parts, in particular with multiple curves, as a prefabricated part from straight pipe parts by bending, characterized in that in a pipe part () that is straight in the initial state, the wall of the pipe part is thickened between pipe parts serving to create the legs or the end legs, that they use one to form a bend between the end legs have a suitable or suitable wall thickness, wherein the end legs are brought into a desired angular position to the longitudinal axis or to the center line can be. 2. The method according to claim 1, characterized in that that the straight pipe part (1) forming the starting material has the same dimensions as the straight one Having pipeline routing. 3. The method according to any one of claims 1 and 2, characterized in that for the production of multiple curved pipeline parts several, so two or three, for bending or curving certain thickened wall sections in the between the legs located Chen pipeline part adjacent to one another in a bend or bend to be formed by the bend a certain distance can be provided, with appropriate Leg lengths at the ends of each elbow are possible. 4. The method according to claim 1 to 3, characterized in that the forming of the to the manifold bending or to be curved sections with thickened walls takes place in such a way that the q straight Ausganqsrohrleitungteil is subjected to an upset pressing in the longitudinal direction, which is in a external deformation to a wall thickening in sections expresses at the points to be bent and a pre-ovalization of the cross-section in the section, wherein appropriately divided compression sleeves are used for the sections. 5. The method according to claim 4, characterized in that that the straight pipe part or section to be bent is introduced with the one suitable for the material Temperature brought into the shape of the finished spool by pressing with the aid of a die and a male die becomes, whereby by pressure in the direction of the main axis of the oval cross-section a round cross-sectional shape with approximately the same thickness is achieved in the outer arch and inner arch. 6. The method according to claim 5, characterized that for multiply curved pipe parts the section to be curved after a first compression molding by means of the male and female mold -. "from the form to be moved on by a distance, and that after the Further movement a renewed compression molding is carried out in a curve. 7. According to one of claims 1 to 6 manufactured pipeline part ·, characterized in that the curved Part (a, b) and its legs (c) from one appropriately bent pipe part exist. 8. Multiple curved pipeline part according to claim 7, characterized in that the elbow (a, b) and the legs (c) consist of a pipe part.