EP1256394B1 - Machine de pliage de profilées à mandrin - Google Patents

Machine de pliage de profilées à mandrin Download PDF

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Publication number
EP1256394B1
EP1256394B1 EP02010533A EP02010533A EP1256394B1 EP 1256394 B1 EP1256394 B1 EP 1256394B1 EP 02010533 A EP02010533 A EP 02010533A EP 02010533 A EP02010533 A EP 02010533A EP 1256394 B1 EP1256394 B1 EP 1256394B1
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EP
European Patent Office
Prior art keywords
mandrel shaft
profile
tool according
bending
lubricant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02010533A
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German (de)
English (en)
Other versions
EP1256394A2 (fr
EP1256394A3 (fr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Palima W Ludwig and Co
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Palima W Ludwig and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Palima W Ludwig and Co filed Critical Palima W Ludwig and Co
Publication of EP1256394A2 publication Critical patent/EP1256394A2/fr
Publication of EP1256394A3 publication Critical patent/EP1256394A3/fr
Application granted granted Critical
Publication of EP1256394B1 publication Critical patent/EP1256394B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/10—Bending tubes using mandrels or the like by passing between rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/04—Bending tubes using mandrels or the like the mandrel being rigid

Definitions

  • the invention relates to a profile-mandrel shank tool according to the preamble of claim 1.
  • a profile-mandrel shank bending tool is to guide the profile-mandrel shank tool in the interior of the profile to be bent and in particular in a region between a roller center roller and the support roller.
  • This profile-mandrel shaft should thus avoid an inadmissible radially inwardly or laterally and inwardly inwardly and outwardly directed deformation of the hollow profile during the bending process. It is preferably adapted in its shape to the profile to be bent and is held by a mandrel which is fixed in a mandrel station.
  • the profile-mandrel shank tool remains in said area to support the profile to be bent in the interior.
  • An inventive mandrel shaft is used for any bending machines. So it does not matter here, for example, to use three-roller bending machines. It can also after such Dornitfte
  • the invention can be used for core roll bending machines, as well as for pipe profile bending machines, mandrel bending machines and others.
  • the invention is generally directed to a mandrel station having at least one mandrel bar and a mandrel shaft disposed at the forward end of the mandrel bar.
  • a mandrel station having at least one mandrel bar and a mandrel shaft disposed at the forward end of the mandrel bar.
  • mandrel stations with mandrel bars, and there may be oppositely directed mandrel stations with mandrel bars, so that so with respect to the bending zone opposite mandrel shafts are present.
  • a bending mandrel for a bending tool for pipes which is formed at the end with a ceramic disk with a convexly curved lateral surface, wherein the ceramic screw is fixed with a dowel on an end face of the mandrel.
  • the ceramic disc of the bending mandrel slides without the addition of lubricant along the inner wall of the tube to be bent.
  • This invention has the disadvantage that the bending pressure forces in the bending line arising during the bending process are uniformly distributed to the circumference of the ceramic disk only during the forming of round pipes.
  • the pressure-poor ceramic disk is not sufficient to absorb the relatively high bending pressure forces during the bending process.
  • a mandrel is disclosed on pipe cold bending machines, wherein the mandrel described here is lubricated during the bending process of pipes via a mandrel lubrication in order to keep the considerable wear of the mandrel and damage to the pipe inner wall as low as possible.
  • the lubricant is in this case pressed by means of a lubrication hole through the mandrel rod in the mandrel, escapes through a lubrication hole located at the top of the mandrel shaft and is distributed over a lubrication groove on the circumference of the mandrel shaft.
  • a subsequent ball joint mandrel at the front end of the mandrel maintains the tube cross-section approximately upright and is used as a shaping means in the present invention.
  • This invention has the disadvantage that a lubrication, especially in the area of the bending line, which is subjected to high bending pressure forces, is not disclosed.
  • a lubrication especially in the area of the bending line, which is subjected to high bending pressure forces, is not disclosed.
  • the supply of large quantities of a lubricant ensures adequate lubrication in general.
  • just in the area of the bending line on the front end side of the mandrel shaft is not lubricated, but far behind.
  • the disadvantage of this invention is that the wrinkle-smoothing shell can absorb only to a limited extent the bending compressive forces occurring during deformation and that a specially associated fold-smoothing shell must be used for each tube dimension. Furthermore, a targeted lubrication in the bending line is not disclosed.
  • the invention is therefore the object of developing a profile-mandrel shank tool of the type mentioned so that it can absorb the highest pressure loads, consistently good sliding properties and even regardless of temperature influences ensures uniformly high bending speeds of a profile to be bent.
  • the mandrel shaft can now absorb the highest pressure loads, because according to the invention, at least in the bending line, an area is reinforced.
  • Alu with its alloys, Cu, Mg, steel, Cr-Ni-Mo steels, titanium, magnesium etc.
  • Another advantage is that high speeds of the continuous profile are ensured at the same time high degrees of deformation.
  • the resulting from the rolling at the bending line flow in the structure of the profile to be bent supports the bending process itself to a great extent.
  • At the outside of the arch profile of the stretching process is supported, on the inside of the arch profile of the upsetting process is supported.
  • Profilaus H- as well as in profile interior of the microstructure flow during the bending process by the superimposed rolling process with the active support of the mandrel shank tool is supported so advantageous that despite the highest material stress micro- or macrocracks in the structure can be prevented.
  • the formation of a highly wear-resistant region on the mandrel shaft can be made in various embodiments.
  • the invention provides that the mandrel shaft consists of a two-part part, namely a rear one Guide shaft on which optionally interchangeable a front mold head is attached.
  • the forming head is now designed to be highly resistant to wear, at least partially in the region of the bending line, whereby such a region can take place by reinforcing the forming head in this area.
  • the reinforcement of the mold head in this area can be done for example by the attachment of hardened webs in the forming head or hardened inserts on the mold head or in such a way that the mold head is formed entirely of a highly pressure-resistant and wear-resistant material.
  • the mandrel shaft is again formed in two parts and consists of the rear, relatively inexpensive material which does not have to withstand high pressure loads and from a front area which is reinforced by wear sliding plates.
  • the wear sliding plates are accommodated as insert plates in corresponding guides on the front part and are preferably formed of a sintered metal.
  • These wear plates have excellent pressure absorption capacity, are highly tempered, have a very smooth surface and are extremely resistant to pressure. They are characterized by a high material density, which leads to the best possible surface quality of the profile to be bent.
  • the said wear sliding plates are held by a front clamping plate, which bias the wear sliding plates both in the radial direction inwardly and secure against lifting.
  • the mandrel shaft is formed with one or more rolling elements, which are arranged at least in the region of the bending line.
  • rolling elements may e.g. Be balls that are freely rotatably guided in a ball cage, but it can also be individual balls, which are arranged in corresponding ball mounts on the forming head, and it may also be a total of ball bearings, which are received in corresponding bearing elements.
  • rolling elements instead of the freely rotatably mounted rolling elements other rolling elements are used, which are rotatably mounted on associated axes of rotation. These rolling elements can in turn be designed as cylindrical rollers, tapered rollers, barrel rollers or the like.
  • a combination of the aforementioned freely guided ball or rolling elements can be used with mounted on rotary axes ball or rolling elements.
  • the rolling elements mounted on axles only take up positioning of the mandrel shaft in the interior of the profile to be bent, while the actual high rolling pressures are absorbed by the freely guided rolling elements in connection with their rolling bed.
  • Essential in the invention is therefore that at least the region of the mandrel shaft, which lies in the bending line, is provided with said reinforcing measures.
  • the reinforcement of the mandrel shaft in the bending line also by others Arm michs stresses be realized, in particular by diamond-occupied support or reinforcing plates, by high-strength steels, or by ceramic elements, which are also able to accommodate the high Auswalzdschreibe.
  • This particular lubrication is to enjoy protection in isolation, that is, regardless of whether the mandrel shank is reinforced or not, and it should enjoy protection in another embodiment, in combination with the reinforcement.
  • the lubricating system according to the invention preferably consists of an air-oil lubrication system, wherein in a first embodiment in the region of the mandrel station, a lubricating device is arranged, the lubricating oil under pressure 30 bar through the mandrel and through the mandrel shaft to the front end of the mandrel shaft transported, with the pressure oil and separated from this compressed air is carried.
  • the two streams air-oil are then transferred in the front region of the mandrel shaft in oil microdroplets, without causing nebulization.
  • the entrained air stream tears the oil droplets flowing out of a nozzle, swirls these into an oil-air mixture and conveys them into lubrication pockets arranged radially on the outer circumference of the mandrel shaft, where the resulting pressure of about 6 bar builds up and the oil-air mixture on the Inner circumference of the profile to be bent in the region of the mandrel shaft acted upon.
  • the lubrication pockets are tapered conically in the conveying direction and point with their narrowest areas on the reinforcing zone, so that in this Arm michszone a very thin lubricant film is generated, which lubricates the high-strength region arranged there in an excellent manner.
  • the lubrication pockets are thus formed in the bending direction in front of the highly wear-resistant region of the mandrel shaft and therefore lead to the highly wear-resistant region only a thin lubricating film.
  • the lubricating device can be set in motion, so that when retracting the profile - contrary to the bending direction - already the entire interior of the profile is acted upon with the lubricating film according to the invention.
  • the aforementioned oil-air mixture can then additionally be applied to the wear plates or even to this high-strength region during the bending operation.
  • the invention provides for two different method arrangements, namely a first method in which the profile is lubricated only during retraction and then no longer lubricated separately during the bending process, which happens in particular for lighter forming work.
  • the profile to be bent is lubricated both during the intake, as well as during the bending process itself.
  • mandrel shank according to the invention as a profiled shaft, that is, he not only has a reinforced area, but he has profiled longitudinal grooves, which are protected with appropriate reinforcing measures.
  • a simpler lubrication system can also be used in which an oil film is dispensed onto the inside of the profile merely via one or more spray nozzles.
  • Such spray nozzles are arranged at the front end of the mandrel shaft.
  • such spray nozzles can also be arranged on the circumference of the mandrel shaft in addition or in isolation.
  • FIG. 1 a profile bending machine 1 is generally shown, which consists of a four-roller system in the illustrated embodiment.
  • a support roller 11 is arranged behind the bending direction, a roller 12 and behind the turn in the bending direction, a bending roller 13 is arranged.
  • the profile bending machine 1 is connected via a bridge 3 with a mandrel station 2.
  • a thrust carriage drive 4 and a lubricating device 6 is arranged.
  • the mandrel 7 with the mandrel shaft 15 attached thereto at the front end is arranged in the interior of a profile 8 to be bent.
  • the mandrel 7 is acted upon by a drive, not shown, which is arranged in the mandrel station 2.
  • the profile 8 to be bent is held by a gripping head 10, which is fastened to the thrust carriage 5.
  • the lubrication is now carried out by the arranged in the mandrel station 2 lubrication device 6, which is connected via a double tube 16 to a terminal 27, via which the two media pressure oil and compressed air into the interior of the mandrel 7 and thus into the interior of the mandrel shaft 15th be fed.
  • FIG. 1 shows schematically that a profile to be bent in the positions 8 ', 8 ", 8"' or 8 “” can be bent.
  • FIGS. 2 to 5 show different forms of Dornsphaseften 15 ad.
  • mandrel shaft 15 a is formed from a rear, little wear-resistant material as a guide shaft 17 which carries a front forming head 19.
  • This forming head 19 can be interchangeably arranged on the guide shaft 17 and can even be highly wear-resistant and pressure-resistant.
  • This Auswalz Scheme 20 is formed in the bending direction in front of and behind the bending line 18 of the profile to be bent.
  • brackets are in FIG. 2 the positions of the rollers 12, 13, 14 used in each case.
  • the mold head 19 as a whole consists of a highly wear-resistant, pressure-resistant material or is merely reinforced in a rolling region 20 with appropriate measures or is designed to be highly wear-resistant.
  • These wear sliding plates 21 may be arranged either only on the upper and lower sides of the mandrel shaft 15, as it is FIG. 3 or they may also extend evenly around the circumference of the mandrel shaft in the rolling region 20.
  • Said wear sliding plates 21 are held in position by a front clamping plate 22 and biased. They are thus secured against radial lifting.
  • said wear sliding balls may also be present only partially or partially and arm only the highly wear-resistant areas of the mandrel shaft.
  • FIG. 5 shows a mandrel shaft 15 d, in which wear sliding rollers 25 are mounted in the axis of rotation 26.
  • FIG. 6 an enlarged view of the front end of the mandrel 7 is shown - as in FIG. 1 shown.
  • a terminal 27 is provided, in which the double tube 16 opens.
  • the clamping head 10 is shown with the mandrel bar 7, which carries at its front end a mandrel shaft receptacle 28 in which the mandrel shaft 15 is fixed.
  • the mandrel shaft 15 preferably has a central channel 29, which is designed as a double channel, to guide the two media air and oil separated from each other.
  • a nozzle 32 is arranged.
  • FIG. 7 shows an enlarged view of the situation FIG. 6 with the enlarged front end of the mandrel shaft 15th
  • mandrel shaft is equipped in its formation as a mandrel shaft 15 b with each other opposite wear sliding plates 21.
  • These wear sliding plates are each received in dovetail-shaped receiving pockets 43 and abut with obliquely radially inwardly directed cone clamping surfaces 45 to a corresponding likewise obliquely formed clamping plate 22.
  • the clamping plate 22 is biased by a clamping screw 44 against the wear sliding plates 21. In this way, these wear sliding plates 21 are biased in their receiving pockets 23 and secured against lifting.
  • reinforcing rings are used, that is, the reinforcing measures according to the FIGS. 2 to 5 are then evenly distributed around the circumference of the mandrel shaft.
  • the aforementioned channel 29 is according to FIG. 7 from a coaxial, outer annular channel 30, in which the compressed air at a pressure of eg 4 - 10 bar is guided, while separated from an oil hose 31 is guided in the center of the channel 29, which opens into a front nozzle 32.
  • the oil is conveyed at a delivery pressure of eg 20-30 bar and exits in the form of oil droplets from the nozzle mouth of the nozzle 32.
  • the mixing chamber 33 In the flow direction of the mixing chamber 33 is followed by an approximately cylindrical vortex chamber 34, in which there is a swirling of the oil droplets 40 with the air flow 39, so that the oil droplets 40 are carried by the air flow.
  • the air flow thus serves only as a transport medium for the oil droplets 40, so that the air-borne oil flow in arrow directions 41 in obliquely adjoining the mixing chamber 33 channels 35 occurs.
  • These channels 35 are directed obliquely in the bending direction to the front and open radially outward in lubrication pockets 36.
  • These lubrication pockets are in accordance with in cross section FIG. 7 arranged approximately triangular profiled, extend approximately over the entire width of the area to be lubricated, as for example in FIG. 9 is shown.
  • This lubricating film 42 is only about 10 to 500 .mu.m thick and is characterized in that it runs parallel in the region of the wear sliding plates, so that they are lubricated evenly over their surface.
  • the wedge shape of the lubrication pockets 37 which are directed to the wear sliding plates 21, is allowed to form in the region of Schlnd sliding plates on the outer surface, a relatively constant lubricating film 42 with said thickness.
  • a particularly thin and highly durable lubricating film 42 is generated. The excess air flows in the direction of arrow 54 past the non-reinforced areas and flows forward into the interior of the profile. 8
  • the air can also flow backwards in the opposite direction to the arrow 54 in the direction of the mandrel station 2 and escapes at the clamping head 10.
  • FIGS. 8 and 9 show a simplified lubrication system that works without turbulence of oil and air.
  • the oil-air mixture is already generated in the lubricating device 6 at the mandrel station 2 and fed via said channel 29 into the mandrel shaft 15, where this mixture enters the lubrication channel 47 and a check valve 48 passes.
  • the check valve 48 consists of a spring-loaded valve ball, which closes the lubrication channel 47 against the pressure in the lubrication channel 47.
  • FIG. 9 shown again, wherein in plan view, the transverse extent of the lubricating pockets 36, 37 can be seen, as in the embodiment according to FIG. 7 is present.
  • FIG. 10 again generally shows the perspective view of the entire bending machine with the mandrel station 2, where it can be seen how the said parts are associated with each other.

Claims (22)

  1. Outil à mandrin pour profilés pour plier des profilés creux ouverts ou fermés (8), comprenant un mandrin (15) avec une tête de formage (19 ; 22) apte à être introduit dans l'espace intérieur du profilé creux (8) et à être sorti de celui-ci à l'aide d'un dispositif d'acheminement, étant précisé que la tête de formage (19 ; 22) se trouve pendant l'opération de pliage sur une ligne de pliage (18) entre au moins deux cylindres (11-13 ; 14) qui sont dirigés à l'opposé l'un de l'autre et qui appliquent la pression de pliage, et est conçue au moins dans la zone (20) de la ligne de pliage (18) pour être très résistante à la pression et à l'usure,
    caractérisé en ce que la zone armée (20) est formée grâce à l'installation, dans la tête de formage (19), de pièces rapportées trempées.
  2. Outil à mandrin pour profilés selon la revendication 1, caractérisé en ce que le mandrin, pendant l'opération de pliage, se trouve sur une ligne de pliage entre au moins deux cylindres qui sont dirigés à l'opposé l'un de l'autre et qui appliquent la pression de pliage.
  3. Outil à mandrin pour profilés selon les revendications 1 et 2, caractérisé en ce que le mandrin (15) est en deux parties et se compose d'une tige de guidage arrière (17) sur laquelle est rapportée une tête de formage avant (19 ; 22) présentant la zone armée (20) conçue pour être très résistante à la pression et à l'usure.
  4. Outil à mandrin pour profilés selon la revendication 3, caractérisé en ce que la tête de formage (19 ; 22) est apte à être changée.
  5. Outil à mandrin pour profilés selon l'une des revendications 1 à 4, caractérisé en ce que la zone armée (20) est formée grâce à des pièces rapportées trempées (21 ; 23 ; 25) prévues sur la tête de formage (22).
  6. Outil à mandrin pour profilés selon la revendication 5, caractérisé en ce que les pièces rapportées trempées (21 ; 23 ; 25) sont prévues sous la forme d'au moins une plaque d'usure de glissement (21) et/ou d'au moins une bille d'usure de glissement (23) et/ou d'au moins un rouleau d'usure de glissement (25).
  7. Outil à mandrin pour profilés selon la revendication 6, caractérisé en ce que la ou les plaques d'usure de glissement (21) se composent de métal fritté.
  8. Outil à mandrin pour profilés selon l'une des revendications 6 ou 7, caractérisé en ce que la ou les billes d'usure de glissement (23) sont logées, en rotation libre, dans au moins une glissière pour bille (24) qui fait tout le tour.
  9. Outil à mandrin pour profilés selon l'une des revendications 6 à 8, caractérisé en ce que le ou les rouleaux d'usure de glissement (25) sont globalement stationnaires et sont conçus pour tourner sur leur propre axe de rotation (26).
  10. Outil à mandrin pour profilés selon l'une des revendications 1 à 5, caractérisé en ce que la zone armée (20) est formée par une tête de formage qui se compose dans l'ensemble d'une matière très résistante à la pression et à l'usure.
  11. Outil à mandrin pour profilés selon l'une des revendications 1 à 10, caractérisé en ce que le mandrin (15) est lubrifié à l'aide d'un lubrifiant au moins dans la zone de la ligne de pliage (18).
  12. Outil à mandrin pour profilés selon l'une des revendications 1 à 11, caractérisé en ce que le mandrin (15) est lubrifié à l'aide d'un lubrifiant au moins dans la zone de la ligne de pliage (18).
  13. Outil à mandrin pour profilés selon la revendication 12, caractérisé en ce que le lubrifiant est prévu sous la forme de fines gouttelettes de lubrifiant (40) au moins dans la zone de la ligne de pliage (18).
  14. Outil à mandrin pour profilés selon la revendication 13, caractérisé en ce que les gouttelettes de lubrifiant (40) sont produites à l'aide de pulvérisateurs.
  15. Outil à mandrin pour profilés selon la revendication 13, caractérisé en ce que les gouttelettes de lubrifiant (40) sont produites à l'aide d'un milieu gazeux qui est amené dans le lubrifiant.
  16. Outil à mandrin pour profilés selon la revendication 15, caractérisé en ce que le lubrifiant est constitué par une huile lubrifiante, et le milieu gazeux par de l'air.
  17. Outil à mandrin pour profilés selon l'une des revendications 11 à 16, caractérisé en ce que le lubrifiant est prévu sur le mandrin (15) dans la zone de la ligne de pliage (18) à une pression d'environ 2 à 10 bar.
  18. Outil à mandrin pour profilés selon l'une des revendications 11 à 17, caractérisé en ce que le lubrifiant est prévu dans au moins une poche de lubrifiant (36, 37) sur le mandrin (15), dans la zone de la ligne de pliage (18).
  19. Outil à mandrin pour profilés selon la revendication 18, caractérisé en ce que la ou les poches de lubrifiant (36, 37) sont effilées en cône dans le sens d'acheminement des gouttelettes de lubrifiant (40).
  20. Outil à mandrin pour profilés selon l'une des revendications 1 à 19, caractérisé en ce que le mandrin (15) est conçu comme une tige profilée avec un profil qui s'étend à peu près dans le sens longitudinal.
  21. Outil à mandrin pour profilés selon l'une des revendications 1 à 20, caractérisé en ce que le mandrin (15) n'est apte à être en contact avec le lubrifiant que lors de son introduction dans le profilé creux (8).
  22. Outil à mandrin pour profilés selon l'une des revendications 1 à 21, caractérisé en ce que le mandrin (15) est apte à être en contact avec le lubrifiant lors de son introduction dans le profilé creux (8) et aussi pendant l'opération de pliage elle-même.
EP02010533A 2001-05-12 2002-05-10 Machine de pliage de profilées à mandrin Expired - Lifetime EP1256394B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10123265A DE10123265A1 (de) 2001-05-12 2001-05-12 Profil-Dornschaft-Werkzeug
DE10123265 2001-05-12

Publications (3)

Publication Number Publication Date
EP1256394A2 EP1256394A2 (fr) 2002-11-13
EP1256394A3 EP1256394A3 (fr) 2004-02-04
EP1256394B1 true EP1256394B1 (fr) 2009-03-18

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Application Number Title Priority Date Filing Date
EP02010533A Expired - Lifetime EP1256394B1 (fr) 2001-05-12 2002-05-10 Machine de pliage de profilées à mandrin

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EP (1) EP1256394B1 (fr)
AT (1) ATE425825T1 (fr)
DE (2) DE10123265A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006025746A1 (de) * 2006-05-31 2007-12-06 Klingelnberg Ag Dornschaft-Wechselbiege-Werkzeug
DE102007043805A1 (de) * 2007-09-13 2009-03-19 Patentgesellschaft Maranatha Verfahren und Vorrichtung zum Biegen oder zum linearen Auswalzen von Profilen mit achslosen Minirollwalzkörpern
DE102008006293A1 (de) * 2008-01-28 2009-07-30 Patentgesellschaft Maranatha Verfahren und Vorrichtung zum Biegen von Rundrohren und Profilen
JP6710598B2 (ja) 2016-07-12 2020-06-17 三菱重工業株式会社 管材の製造方法およびマンドレル
CN107363133B (zh) * 2017-08-30 2019-04-05 杭州流控机器制造有限公司 弯管半径连续可调的无模自动弯管机及弯管方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1567107A (en) * 1922-08-04 1925-12-29 Bonn Carl Robert Hugo Machine for bending tubes and the like
DE4041668A1 (de) * 1990-12-22 1992-07-02 Walter E Spaeth Verfahren zum biegen von metall-hohlprofilen und vorrichtung zur ausuebung des verfahrens
AT404908B (de) * 1995-01-23 1999-03-25 Vaillant Gmbh Biegedorn für ein biegewerkzeug
DE29503764U1 (de) * 1995-03-09 1995-05-04 Schulze Juergen Dipl Ing Faltenglätter an Rohrbiegemaschinen
DE29600728U1 (de) * 1996-01-17 1996-02-29 Schulze Juergen Dipl Ing Stützdorn an Rohr-Kaltbiegemaschinen
DE19717232A1 (de) * 1997-04-24 1998-10-29 Suban Ag Verfahren und Vorrichtung zum dreidimensionalen Biegen von Metall-Hohlprofilen

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EP1256394A2 (fr) 2002-11-13
ATE425825T1 (de) 2009-04-15
DE50213359D1 (de) 2009-04-30
DE10123265A1 (de) 2002-11-14
EP1256394A3 (fr) 2004-02-04

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