DE2210715A1 - Method of influencing the cross-section of pipes and other elongate objects during bending and apparatus for carrying out the same - Google Patents

Description

COJAPEX U.V. Olashaven loc, Potterdam, Holland

Ancestors -un rpeir / lmMon des Quo rc ehr. itί '· von Pohren und nnneren la.-iaqcr; treck ton ner>on:> tnnden vehrep ^Λ; of bending and device for pure implementation

rriorltMt: March 5, 1971; Holland /, nnclde-- ITr. 7] o.3olo

The eriiimiunq l'ozxes sicli to an ° influence c) <esquerschnitt5 of pipes and iuidcrcn l'mocfey! .-. stretched- Geaenr.t would be progressing curved v / earth, v; obei the bieaon by heating the Object in a narrow zone across the Länanrichtuna des Gc-irreniitc "indof5 and. By applying a bending moment to the object is effected in the zone.

As for example in the Czechoslovak patent specification 111.259, the moment can be sclrwenkhijren Biegearins can be achieved with which the longitudinal qezogene

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.in stirrer, non-rotatable none 'is connected behind the heated zone. The distance between the connection point and the fulcrum of the Kiegearms corresponds c \ ur) radius, in üer \ represents. Tube to be bent.

The line which connects the heated zone with the Prehnittolpunkt must be perpendicular or essentially perpendicular to the longitudinal axis of the lower part of the body. It should be noted that set a pivotable Arn :; other facilities for lowering i \ c: r> pipes :; iihn behind the oufcehoijten zone along a T * ri.t the desired ¹ · ': Radius used v; to earth ground, which in ηο dor heated Ζ "· produce a lHegononent that in the zone of deformation dr · ;, P. In the heated zone the temperature is increased enough to prevent deformation, but in front of and behind the zone the lower temperature (which behind the zone is achieved, for example, by additional cooling) can be regarded as rigid.

In the heated zone, the material is on the inside toggle side pressed together while bending, on the outer side stretched.

As is well known, the inner side, but especially the outer side of the arch, tends to move towards the center line

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to move the object. As a result, a round tube licit that Strive to have an oval, in most-cases-undesirable cross-section. to accept. Such a deformation is particularly evident when bending pipes in a hot or cold state a well-known phenomenon. As a remedy, facilities v / ie Padding, filling with sand or a thorn used. The smaller the bending radius, the greater the deformations in to be alone.

It is therefore closer to the finding to create a method and a device that can influence the ί "Ηκ.-ϊ suhnittsfom des zu bieacndi-in Gecieniitandes, so that clanit boinni.c-'lf'.vei re . the oval Defnrnatinn eine.-, rrebogencn ^ ohrof outvedcr completeness, ^ ia odfir v; eitr "can be verhindort accordingly _D; n · - cregenüJier is one under bcstinmton Unst Mndc: n even be nögldch, a round liolir an oval Oucrr -schnittforn ru vcrlfiihcn, the great axis of which lies in the P.ioqeebone.

For the solution of this task v. Is with reference to the center: the bee radius at such a point and / or in such a place Heated direction that the plane of the heated zone does not or does not go completely through the center point.

Since devices are known with which bending is carried out in the manner described in the description unit

knnn, the following is only the principle of the invention further explained by pictorial representations:

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It lines:

to carry out the procedure and

Fig. 2-5 partially cut-away views of a to be bent Tube with different Aufheizunq.

one. The pipe 2 to be bent as neisniel ciev / iiIi 1 is given by /. 'Ulirung: -.- ·

or a Hiem? <* rn
einrichtuno ^ / '3 vorvv.rts l ^ ewegt in the direction of the arrow behind a heating device, not shown, through which; Pohr in the direction indicated by 2b narrow zone to a temperature heated vi.rd., wherein the verfomt Pohr desirably vrcrden kc \ nn. Behind the heating element, section 2c, which is required to be cooled by a nicely drawn cooling device, is guided on a circular path to point 1, because section 2c is rotatably fixed with a die gear 5 \ -cr} vandc: n, which can be rotated around point 1. Zusamnrn with the Biego.irn dor is already bent part of the ^p ear 2c practically a rigid assembly and represents the theoretical lever constant perpendicular or v / osentlichen perpendicular to the longitudinal axis of the remains to be bent article. In this figure, the heated zone 2b is arranged in the plane 4 which passes through the center of rotation 1 and is perpendicular to the center line of the Pohr section 2a.

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During the bending process takes place on the inner side of the arch * 2e a compression and on the outer side 2d a stretching takes place. Somewhere in between, however, there is a neutral zone, practically without compressing or stretching.

Because the material of the heated zone is on the inner side of the arch and on the outer side of the arch a codification in the longitudinal direction of the pipe section 2a, the parts 2e and 2d have the Endeavor to shift in the direction of the pipe center line and create an oval shape of the pipe.

VJe η η, however, the heated zone is moved forward, mini I in the direction of movement of the pipe (Fig. 2) , so that in the figure the zone is above level 4, then occurs in the axif heated zone in addition to the longitudinal force P a transverse force D in the direction to the left, which endeavors to keep the pipe wall away from the pipe center line at 2e, but at 2d tries to move the pipe wall in the direction of the pipe center line.

On the other hand, if the heating zone is moved back (Fig. 3), so that it lies below level 4 in the figure, a transverse force occurs in addition to the longitudinal force P in the heated zone D in the direction to the right, which tries to keep the pipe wall away from the pipe center line at 2d, but at 2e to move the pipe wall in the direction of the pipe center line.

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In the arrangement shown in Figures 2 and 3, a deformation of a round tube or generally a lateral, "Shrinkage" of a profile can only be effectively counteracted if there is a difference in the resistance to such deformation exists between the wall parts on the inside of the arch and on the outside of the arch of the object. Such differences can differ due to the asymmetrical cross-section of the Ciegenst < or by unequal heating on the inside of the sheet and the Result in the outside of the arch.

With a symmetrical cross-sectional profile, for example a Pohr with uniform wall thickness, and symmetrical heating, that is in most cases, the arrangement can be according to figure 4 can be used. This is where the center of the wooded up is located Zone practically in plane 4, which is perpendicular to the longitudinal axis of the unbent tube and through the BJ ocremi ttelpunkt I goes / but the plane of the heated zone forms an angle

with level 4, so that 2e above and 2d below in the figure
half of this level / lie.

As a result of this arrangement, a transverse force D 'acts outwardly on section 2e and a transverse force D "acts on section 2d outside, which counteract the tendency of these sections to move towards the pipe center line. Under certain

shape

Circumstances may even an opposite ^ova l ^e of the tube can be achieved / in which the major axis of the oval is in the plane of the drawing.

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In addition to the arrangements shown in FIGS. 2 to 4, it is also possible to use such arrangements as a combination thereof be able to accept ν. For example, an arrangement

the
used, be.i / next to a "slope" of the heated zone accordingly Fig. Ί a shift of the same according to Fig. 2 or 3 present int is partially inclined with respect to this plane, namely on the bogcnus side.

If you want *! All «, the heating zone can also be geneiyt to the other side v.ip in Fig. Λ, namely from the normal P-ostraben to the ονείου ΐ ^Γ οι · τη d":;: with bending T'ohrcn rrostcirc- ^.?. rt ν.'οτ-don solo By Anv onduna dor Erfiiiduna leg bending a ¹ ears OD ^ r andc.'j ---'- i · nec · '"rckter Ccaenstämle can ttprcii so the Querschni: Ί ] in giiV'issoji Crenron}> coinf flows. Λ In the most important * "; of the so erroi clibaron Möolichkeiten the Hörilichkeit can be considered to keep a round 'ear boir' bees actually round.

Fine device by means of which the method according to the invention is used, is characterized in that the heating device, through which the heated zone of the elongated, object to be bent is generated, with respect to the plane which is perpendicular to the longitudinal axis of the object and through the Bending center goes, is arranged such that the desired cross-sectional profile is either retained or in the bending zone

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for different cases, for example for different radii must be different, an adjustability of the heating device with respect to its support is desirable, the generally by the guide device for the still unbent Part of the object is formed.

The setting of the heating device can be adjusted automatically accordingly

ova IfM; Forn
the orad of / made during the bending process

is eaten by a feeling song.

The heating device can be of different types. So the heating of a narrow zone of the object boipiclsv / one can be carried out with electrical induction, radiation or convection. The heating method should be matched to the material of the objects to be bent ^ · ^r Iin, dc * r, but also may be made of glass or a suitable synthetic material made of metal.

- Q _

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Claims (6)

Method for influencing the cross-section of progressively bent pipes and other 'elongated Objects, wherein the object is heated in a narrow zone to carry out the bending, which transversely to the Longitudinal direction dos f'orrenstands, and in this zone a Bending morioiv. cnqeL. ^: is characterized in that with respect to the central point of the bending radius such a place and / or in such a direction ~ is heated that the level of the heated zone is not or not completely through the midpoint eight. 2. The method according to claim 1, characterized in that it is heated such that the plane of the heated Zone is at a distance parallel to the plane which is perpendicular to the longitudinal axis of the unbent object and goes through the center of the bend. 3. The method according to claim 2, characterized in that it is heated in such a way that the plane of the heated zone forms an angle with the plane _e which is perpendicular to the longitudinal axis of the unbent object and passes through the bending center. »Io - 203844/981; ORIGINAL INSFECTH) - Io - 4. The method according to claim 1, characterized by ,, ja gk en ,, »n ... z" eJL · · «? Λ) *., · Ή et, .. that it is heated in such a way that the heated zone is inclined with respect to the plane that passes through the bending center point that the heating zone on the. The inside of the arc lies in front of the hot zone on the outside of the arc, calculated in the direction of the progressive movement of the object. 5. The method according to claim 1, characterized in that that heating is carried out in such a way that the plane of the heated zone is a bent or curved surface. 6. Apparatus for carrying out the method according to a dor vorherqehenden claims, which is provided little by little to be bent the article and in front of the heating device with a device for circular Führunn a Biegenittelpunkt behind a heater for heating a schnalen zone nit means for movement of, characterized geke η η indicates that the heating device is with respect to the I- " _{plane (*) (} which is perpendicular to the longitudinal axis of the object / to be bent (4)
and through the bending center point / is arranged in such a way that the desired cross-sectional profile of the object to be bent is either retained or achieved in the bending plane. - 11 - 209844/0691 ?. ■ ■ '■' ^:: vOrricht \ ing H'atfh Tvns'p'rtich * ^6: "dadu'rch '' - ''gek" e '' nh "z". e "x c -I η et that the heating device is connected to its support adjustable. 0. Apparatus according to claim 7, characterized net, that there is a feeling song int that goes to di--. oval forir> responds and a signal for the automatic! r.cho setting of the Heater ranO3 ~ t. 20984 4/0691 WWW »·