DE1092866B - Method for manufacturing a pipe elbow with a connection piece on the outer elbow - Google Patents

Description

GERMAN

The invention relates to a method for producing a pipe elbow with a connecting piece on the outer arc of curvature, in which a bend with straight legs between parallel Plates is held and the straight legs are brought closer together by applying pressure.

It is known to reduce the radius of curvature of a pipe bend bent by 180 ° by compressing it of the bend between mutually moving dies, the rectilinear ones Legs are pressed against each other after previous heating of the inner arch of curvature. This method is not suitable for forming a pipe socket on the outer bend.

It has also been proposed to use a pipe bend of 180 ° in the outer bend was provided with an opening to be deformed by inserting a forked into this opening Stamp is introduced, which in the area of the inner curve of the curve on the straight elbow attacks and presses them against each other, reducing the radius of curvature of the pipe elbow and a connecting piece is obtained on the outer bend. For the final molding of the connecting piece can attack suitably designed matrices on the outside of the bend. This method is only suitable if the connecting piece to be formed on the outer curve of the curve has a greater inside width than the distance between the elbow legs.

It has also been proposed to use a connecting piece to get a 180 ° bent pipe elbow by moving it along the outer Arch of curvature is slit and then suitable dies against the outer arch of curvature be pressed, which is the material of the outer arch of curvature in the sense of the formation of a Displacement connecting piece, the previously made incision to a circular mouth of the finished connection piece is. In this process, however, the arc of curvature is very much deformed and the pipe cross-section is greatly reduced in certain areas of the bend.

The aim of the invention is to provide a method for producing a pipe elbow with a connecting piece to create on the outer arc of curvature that does not have the disadvantages of the methods mentioned and is applicable if the application of this procedure is only suitable for special cases forbids.

The invention is based on a method of the type mentioned and provides that the pipe bend at the point of the outer curvature

Method of manufacture
a pipe bend with a connection piece on the outer bend

Applicant:
Andre Huet, Paris

Representative: Dr. W. Schalk and Dipl.-Ing. P. Wirth,

Patent attorneys,
Frankfurt / M., Große Eschenheimer Str. 39

Claimed priority:
France 16 June 1954

Andre Huet, Paris,
has been named as the inventor

arc, on which the connection clip is to be formed, heated and the approaching the legs forming bulge is formed into a pipe socket.

When performing this process, the matrices are brought closer together until one Reduction in the radius of curvature of the pipe elbow occurs. During this rectilinear shift of the matrices, a bulge is formed at the previously heated point of the pipe bend. The elbow can be heated on its entire outside; the strongest heating occurs but at the point where the connection piece is to be obtained. The two half matrices point a recess which tapers towards the outside of the pipe bend, through which when it is pressed together displaced the wall material of the pipe bend in the sense of the formation of a bulge will. The connection, which is still closed after this process has been completed, is then cut through Remove the cap of the bulge open.

In order to avoid this last-mentioned subsequent operation, the pipe elbow can expediently at the point where the connection piece is to be formed, pre-punched, and it will while the legs are approaching, a mandrel guiding the migrating material is inserted into this opening. If the outer arch of curvature is not prepunched, the displaced one is supported Wall material through the above-mentioned cap of this bulge.

009 648/166

The invention is explained in more detail below with reference to the drawings, for example, in which the Fig. 1 to 5 schematically the process of producing a connection piece on a pipe elbow according to the invention, while Figs. 6 to 8 illustrate the process after prior perforation explain the outer arc of curvature. In detail shows

Fig. 1 the pipe bend before machining, Fig. 2 the pipe bend inserted in the half die,

Fig. 3 the pipe elbow after being pressed together,

Fig. 4 is a plan view of the arrangement according to Fig. 3,

Fig. 5 is a section through the completed pipe elbow with connecting piece,

Fig. 6 a section through a pre-punched pipe elbow,

Fig. 7 shows a section corresponding to Fig. 6, with the pipe bend between two half matrices inserted and a mandrel is inserted into the opening, and

Fig. 8 shows a section similar to Fig. 7 with the finished pipe elbow with connecting piece. The pipe bend α to be treated, the leg spacing of which is slightly larger than that of the desired finished pipe bend with the pipe socket, is heated to a suitable temperature in the hatched area A in Fig. 1, if necessary after prior filling with sand. The area B shown in Fig. 1 with crossed hatching, in which the nozzle is to be produced, is brought to a higher temperature. If necessary, zones C and D, which are on the inside of the pipe bend, can also be heated.

The pipe bend, held laterally between two parallel plates b and c (Fig. 4), is located during the deformation between two movable half-matrices d and e, which rest on the straight legs of the bend, as can be seen in Fig. 2. The half dies have a curved area E which continues above the arch and is intended to reshape the upset metal. The inner area of the pipe bend can be supported by a die / which, as can be seen in Fig. 2, is arranged between the bend legs and rests against the inner area of the pipe bend. This die f can be attached to the plate b, which z. B. serves as a work table, be attached.

The two matrices d and e can be brought closer to one another in the direction of the arrows F (Fig. 2) in order to compress the arch and to compress the metal with the formation of a bulge at point g (Fig. 3). The half matrices d and e are designed in such a way that an opening h remains between them in the position of greatest approximation above (Fig. 4), in which the bulge with z. B. forms a circular cross-section.

In order to obtain the pipe bend t, it is generally sufficient to open this bulge, as is illustrated in FIG. If necessary, the connecting piece i can then be finished shaped and calibrated in order to bring it to the desired final dimensions.

According to another embodiment of the method according to the invention, an for example circular opening / is first made in the pipe to be treated α as shown in FIG. The presence of this opening facilitates the upsetting of the metal into a nozzle during the pressing process. If necessary, a caliber mandrel k (Fig. 7) can also be used during the pressing process.

ίο be introduced into the opening, so that during the mutual approach of the two half matrices d and e taking place in the direction of the arrows F , the upset metal creeps up along the mandrel k so as to directly form a nozzle i .

In addition, the mandrel k, which encloses the metal located on the inside G of the arch between itself and the supporting die (if such a die is used, but this is not absolutely necessary), can thicken the metal

in this area G can be avoided during the mutual approach of the matrices, in that the excess of metal resulting from the compression is pressed against the outer area of the arch, whereby a nozzle with a very high edge / results.

Instead of half matrices d and e, which lie parallel to the straight legs of the pipe bend α to be treated, matrices with inclined surfaces can also be used, ie matrices which are inclined

are set against the direction of the straight legs, so that the compression first in the outer The area of the pipe bend begins to take effect. Such matrices with an inclined effective surface can also be articulated be stored so that they can be stored in the course of the

Can erect the pressing process in order to achieve a parallel position as shown in Fig. 3 at the end of this process and 8, in which their active surfaces run parallel to the straight legs of the pipe bend.

Claims (2)

PATENT REQUIREMENTS: 1. A method for producing a manifold with a connecting piece on the outer bend, in which a bend with straight legs is held between parallel plates and the straight legs are brought closer together by pressure, characterized in that the bend (α) at the point (B ) of the outer arch of curvature, on which the connection piece is to be formed, is heated and the bulge (g) that forms when the legs are approached is shaped into a pipe socket (i). 2. The method according to claim 1, characterized in that the bend (α) at the point at which the connection piece is to be formed, pre-punched (;) and that during the approach of the legs, a mandrel (k) leading to the migrating material in the opening is inserted. Considered publications: German Patent Nos. 700 604, 733 844, 907 885, 917 661,
French patent specification No. 1029961,1037040. Older patents considered: German Patent No. 943 287. 1 sheet of drawings © 009 648/166 11.60