EP0785036A1 - Procédé et dispositif pour le formage de pièces profilées creuses - Google Patents

Procédé et dispositif pour le formage de pièces profilées creuses Download PDF

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Publication number
EP0785036A1
EP0785036A1 EP97100768A EP97100768A EP0785036A1 EP 0785036 A1 EP0785036 A1 EP 0785036A1 EP 97100768 A EP97100768 A EP 97100768A EP 97100768 A EP97100768 A EP 97100768A EP 0785036 A1 EP0785036 A1 EP 0785036A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
mandrel
forming material
pressing
mold
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.)
Withdrawn
Application number
EP97100768A
Other languages
German (de)
English (en)
Inventor
Hermann A. Bartels
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0785036A1 publication Critical patent/EP0785036A1/fr
Withdrawn legal-status Critical Current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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/10—Stamping using yieldable or resilient pads
    • B21D22/105—Stamping using yieldable or resilient pads of tubular products

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • a device is known from EP-A-0 616 858.
  • the invention has for its object to develop the known device with a view to better deformation results in the workpieces as well as a simpler and less complex construction of the device and shorter cycle times.
  • the solution to the problem is specified in claim 1.
  • the press-in end of the mandrel is expediently in the form of a cone, the outlet openings for the forming material being arranged close to the cone. They are therefore outside the deformation range of the workpiece, so that the openings cannot be blocked.
  • a rod-shaped part or rod sealingly fitting into the workpiece at the lower end which can also be a tube which is closed at the end, is expediently used to close the workpiece at the lower end widely introduced that the front end of the rod-shaped part is at the end of the deformation region.
  • the forming material is thus given a secure abutment and cannot escape from the workpiece.
  • Another possibility for closing a tubular workpiece is to insert a rod into the workpiece from below at the lower end, which rod has a collar of elastic material arranged in a sealed manner between two spaced plates at the upper end.
  • the collar lies sealingly against the inner wall of the workpiece at the end of the workpiece deformation area.
  • the collar can expediently be expanded by means of a fluid through a bore leading through the rod or the interior of a tubular rod. Compressed air is preferably used as the fluid.
  • a device for upsetting the workpiece during the pressing process is advantageously provided. This can be done, for example happen that the workpiece is pressed into the mold from above during the pressing process in the direction of the mandrel movement.
  • the forming material is expediently a fine-grained sand.
  • a method for deforming hollow profile workpieces made of metal is the subject of claim 8 with its subclaims.
  • the workpiece to be deformed which in the exemplary embodiment shown in the drawings is an aluminum tube 11 with a circular cross section, lies in a split mold 12 with two cavities 13, 14 which correspond to the shape of the workpiece 11 to be produced.
  • Heating plates or belts 16 generate and maintain the desired mold temperature in order to heat the workpiece 11 or the Maintain the temperature of the previously heated workpiece.
  • the temperature is expediently above 200 ° C.
  • a mandrel 18 projects from above through a sleeve 20 and a pressing element 22 into the workpiece 11.
  • the mandrel is mounted in the sleeve 20 so that it cannot twist. Further guides for the mandrel 18, for example in the form of a guide tube in the workpiece 11, are not shown for simplicity.
  • the mandrel 18 can be inserted and withdrawn into the workpiece 11 by means of a hydraulic drive, not shown.
  • the position of the mandrel 18 can be precisely adjusted by means of an electronic control (not shown) of the hydraulic device. The same applies to the speed when advancing the mandrel and when retracting.
  • the sleeve 20 and the pressing element 22 are slidably mounted in a housing 24 with an end plate 26. As a result, the workpiece 11 can be compressed during the forming, as will be explained in more detail.
  • the displacement of the sleeve 20 and thus the pressure element 22 is also carried out with the aid of a hydraulic device, not shown.
  • a rod 28, or preferably a rod-shaped part 30, is provided in the workpiece 11 from below and has two spaced plates 32, 34 at the upper end facing the mandrel.
  • a collar 36 made of temperature-resistant, elastic material is arranged in a sealed manner between the plates 32, 34. Through the bore 28 and transverse bores 38 at the lower end and 40 at the upper end, the collar 36 can be inflated with compressed air so that it lies sealingly against the wall of the workpiece 11.
  • FIG. 2 shows the device according to FIG. 1 after the filling of a forming material 43 in the form of sand, which is shown schematically with dots.
  • the filling takes place from a funnel 42 at the upper end of the mandrel 18 through a central bore 44 of the mandrel 18 and outlet openings which are inclined in the form of channels 46 from the central bore 44 lead down to the outer circumference of the mandrel 18 and open there closely behind a conical tip 48 of the mandrel 18.
  • the space below the mandrel is completely filled with forming material 43, the plates 32, 34 with the inflated collar 36 sealing the workpiece 11 downward.
  • Fig. 3 shows the first deformation step for the workpiece 11.
  • the mandrel 18 has been pressed with its tapered tip 48 into the forming material 43 and has pressed the workpiece walls into the cavity 13 and brought it into contact.
  • the workpiece 11 has been compressed in the downward direction by means of the sleeve 20 and the pressing element 22, so that there is practically no reduction in the wall thickness of the workpiece 11 in the region of the cavity 13.
  • FIG. 6 shows the final state of the device after the mandrel 18 has been withdrawn.
  • the collar 36 has been vented, and after the rod 30 has been withdrawn, the forming material 43 can fall out downwards.
  • the split mold 12 is then opened and the workpiece 11 can be removed.
  • a new workpiece 11 can then be inserted immediately, and a new cycle begins after all parts have been brought back into the position shown in FIG. 2 and new forming material 43 has been filled in.
  • the conical tip 48 of the mandrel 18 has a flatter angle.
  • the press-in end of the mandrel (18) has a cone angle of 15 to 165 degrees in the front end region, in an especially preferred manner an angle of 90 degrees.
  • the inventor was able to prove that the choice of the cone angle of the press-in end of the mandrel (18) influences the retightening of the workpiece to be deformed. It turned out that the choice of a more acute taper angle increases the retightening of the workpiece to be deformed.
  • outlets openings which lead in the form of channels 46 obliquely downward from the central bore 44 to the outer circumference of the mandrel 18 and there close behind a conical tip 48 of the mandrel 18 further channels 46 open along the Arrange axial extension of the mandrel and thus for a faster tracking of the forming material to arrive before the respective pressing process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP97100768A 1996-01-22 1997-01-20 Procédé et dispositif pour le formage de pièces profilées creuses Withdrawn EP0785036A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29601019U DE29601019U1 (de) 1996-01-22 1996-01-22 Vorrichtung zum Verformen von Hohlprofil-Werkstücken
DE29601019U 1996-01-22

Publications (1)

Publication Number Publication Date
EP0785036A1 true EP0785036A1 (fr) 1997-07-23

Family

ID=8018358

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97100768A Withdrawn EP0785036A1 (fr) 1996-01-22 1997-01-20 Procédé et dispositif pour le formage de pièces profilées creuses

Country Status (2)

Country Link
EP (1) EP0785036A1 (fr)
DE (1) DE29601019U1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19928873A1 (de) * 1999-06-24 2001-01-04 Benteler Werke Ag Verfahren und Vorrichtung zum Innendruckformen eines hohlen metallischen Werkstücks
CZ299558B6 (cs) * 2000-08-18 2008-09-03 Benteler Ag Zpusob tvárení vnitrním tlakem dutého obrobku
CN102962309A (zh) * 2012-11-27 2013-03-13 江苏麦涛机电设备有限公司 薄壁三通管成形方法及装置
CN110479823A (zh) * 2019-08-09 2019-11-22 武汉源锦建材科技有限公司 一种钢筋连接用灌浆套筒剪力槽的成型装置及成型方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10151013B4 (de) * 2001-10-16 2010-02-11 Volkswagen Ag Vorrichtung zur Formgebung einer Platte aus tiefziehfähigem Material, insbesondere Blech
DE102005036377B4 (de) * 2005-07-29 2008-05-08 Fachhochschule Hannover Vorrichtung und Verfahren zur Formgebung eines Werkstückes
CN103894469B (zh) * 2014-04-04 2016-08-31 燕山大学 轻合金管状构件固体颗粒介质热胀成形方法
CN108746310B (zh) * 2018-05-29 2019-08-09 燕山大学 一种轻合金管材颗粒温热成形装置及其成形工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2310816A1 (fr) * 1975-05-14 1976-12-10 Kumagai Seisakusho Kk Procede pour former des bourrelets sur la peripherie d'un tube metallique ou des objets analogues
EP0616858A1 (fr) 1993-03-26 1994-09-28 Hermann Bartels Procédé et dispositif pour le formage de pièces profilées creuses

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2310816A1 (fr) * 1975-05-14 1976-12-10 Kumagai Seisakusho Kk Procede pour former des bourrelets sur la peripherie d'un tube metallique ou des objets analogues
EP0616858A1 (fr) 1993-03-26 1994-09-28 Hermann Bartels Procédé et dispositif pour le formage de pièces profilées creuses

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19928873A1 (de) * 1999-06-24 2001-01-04 Benteler Werke Ag Verfahren und Vorrichtung zum Innendruckformen eines hohlen metallischen Werkstücks
DE19928873B4 (de) * 1999-06-24 2004-08-12 Benteler Ag Verfahren und Vorrichtung zum Innendruckformen eines hohlen metallischen Werkstücks aus Aluminium oder einer Aluminiumlegierung
CZ299558B6 (cs) * 2000-08-18 2008-09-03 Benteler Ag Zpusob tvárení vnitrním tlakem dutého obrobku
CN102962309A (zh) * 2012-11-27 2013-03-13 江苏麦涛机电设备有限公司 薄壁三通管成形方法及装置
CN110479823A (zh) * 2019-08-09 2019-11-22 武汉源锦建材科技有限公司 一种钢筋连接用灌浆套筒剪力槽的成型装置及成型方法

Also Published As

Publication number Publication date
DE29601019U1 (de) 1997-05-22

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