EP0075599A1 - Procede de preparation d'objets ronds - Google Patents

Procede de preparation d'objets ronds Download PDF

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Publication number
EP0075599A1
EP0075599A1 EP81902307A EP81902307A EP0075599A1 EP 0075599 A1 EP0075599 A1 EP 0075599A1 EP 81902307 A EP81902307 A EP 81902307A EP 81902307 A EP81902307 A EP 81902307A EP 0075599 A1 EP0075599 A1 EP 0075599A1
Authority
EP
European Patent Office
Prior art keywords
profile
core
rim
finished
shape
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.)
Ceased
Application number
EP81902307A
Other languages
German (de)
English (en)
Inventor
Walter Späth
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.)
Spath & Co KG Stahlbau-Biegetechnik GmbH
Spath GmbH and Co KG
Original Assignee
Spath & Co KG Stahlbau-Biegetechnik GmbH
Spath GmbH and Co KG
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 Spath & Co KG Stahlbau-Biegetechnik GmbH, Spath GmbH and Co KG filed Critical Spath & Co KG Stahlbau-Biegetechnik GmbH
Publication of EP0075599A1 publication Critical patent/EP0075599A1/fr
Ceased 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
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/30—Making other particular articles wheels or the like wheel rims

Definitions

  • the invention relates to a process for the production of round bodies, e.g. Wheel rims for motor vehicles, the rim in particular made of an aluminum alloy as an elongated extruded profile with a final cross-sectional shape rounded to the wheel shape and connected in a transverse joint by a weld.
  • round bodies e.g. Wheel rims for motor vehicles
  • the rim in particular made of an aluminum alloy as an elongated extruded profile with a final cross-sectional shape rounded to the wheel shape and connected in a transverse joint by a weld.
  • the object of the invention is to select the method steps in this way and to use known, easy-to-use devices, so that it is possible in mass production, production lines according to the new Establishing processes without the need to introduce heat treatments in between, or the need to have stations to rework the profile.
  • the devices are selected so that an extruded profile with an excess length, i.e. used with addition, as the rim would require, and these deforming and stress-absorbing pieces are selected by the appropriate choice of process steps and devices so that they are at the beginning and end of the extruded profile and then after the corresponding process steps can be cut to length.
  • a core shape is used around which the extruded profile is bent, while the following step then rolls, i.e. a device is used which is suitable for rolling operations.
  • the welding of the transverse joint is also carried out in such a way that tensions are avoided by tightening them in a specific sequence, as specified in the claims, and if necessary using a core shape with its dimensions.
  • the workflow is then such that the clamping of the core stretching device first straight rim profile with excess length, the rim profile is already the finished profile.
  • Pre-bending or rounding on a smaller core shape then takes place. This small undersize is necessary to compensate for a spring deflection that occurs after this pre-bending. After the suspension, the true radius of the rim is reached, i.e. the smaller core shape takes this springing into account.
  • the clamping piece is then cut to length, by means of which bending was possible; this chuck is unusable because it is badly deformed.
  • Bending or rounding then takes place on the same device, up to approximately 360 degrees on a core shape that is too large in relation to the finished diameter.
  • the entire processing of the actual dimension must go through this first preforming step.
  • This core roll bending device has a very small core roll inside and two roll outside, which have the finished profile.
  • this already bent extrusion profile which acts as a lever, is brought to the actual radius dimension via this end bending part.
  • this extended end piece is cut to length, since it is also unusable again because of its severe deformation.
  • the bending or rounding to 360 degrees takes place again with a very small core forming roll and two forming rolls. It is now almost the shape-retaining state of the rim in an almost stress-free state.
  • the rim is then completed by the subsequent welding process of the cross joint.
  • Uniform There has been a certain thinning of the profile, and in order to take this thinning into account, the core shape on which the rim is clamped during the welding process has a small oversize dimension.
  • the clamping process on this core shape takes place in a certain chronological order, since otherwise tension fields can build up on the circumference of the rim or even compressions, which are noticeable after the welding shape is opened due to out-of-roundness.
  • the most appropriate sequence for this tensioning process is specified in the claims.
  • Different welding processes can be used, e.g. Inert gas welding with tungsten innert gas (TIG) or gas pressure welding, which takes place under heat and pressure, also electron beam welding or inert gas welding metal innert gas (MIG), as well as cold press welding.
  • TIG tungsten innert gas
  • MIG metal innert gas
  • weld seam shells have an exact, unchanged dimension compared to the profile cross-section when the subsequent calibration process takes place.
  • the calibration process it would also be conceivable to be able to do without the calibration process. If minor out-of-roundness is caused by residual stress fields from the weld joint, slight excess being leveled cleanly so that there are no visible transitions, these can be minor Dimensional deviations of the profile width at both ends, caused by the positive locking, are brought to exact dimensions during the rolling process.
  • the core roll has a slight oversize compared to the nominal size (caused by thinning the profile). This calibration is carried out with one or more outer mold rolls, e.g.
  • the inner roller rotates, the outer shape and rim run between the inner shape and roller and standing, smooth outer rollers.
  • the rim is placed in the outer shape (clamped) and calibrated with inner form rollers, one or more.
  • the extruded profile 1 is shown in the figures. This extruded profile has the finished profile of the rim.
  • the core stretching device has a core shape 2, this core shape 2 is also moved by the clamping jaw 5 in the direction of the arrow 18 by drivers 19, which are located on the turntable 20 of this core stretching device. This arrangement is important because the jaws must be moved in the direction of arrow 19 and then in the direction of arrow 21 when loosening, and by this entrainment the profile is protected, it is not exposed to great frictional forces, since it is only stressed at the clamping point by the power transmission. is deformed.
  • the clamping jaw 5 and the core shape 2 have the finished profile.
  • the straight extruded profile 1 is guided into the device in the direction of arrow 23, there being guide profiles 3 and counter profiles 4 which, pressed against one another, prevent the finished profile of the extruded profile 1 from being deformed when it is deformed in the core stretching device.
  • the profile pieces for the guide profile, counter profile and the clamping jaws are made of an elastic material in order to reduce all deformations to a minimum.
  • guide and counter profiles 3 and 4 are moved towards or away from one another in order to initiate or end the bending process.
  • the bending piece 6.1 which was subsequently present on the clamping piece 6, is now also removed; since it again had to take up the additional deformation work than after bending up to 360 degrees was rounded and now there is too large a diameter.
  • This core roll bending device is then rounded by means of the forming rolls 8 and the core bending roll 9 until the finished diameter is reached.
  • the end piece 6.1 can then be cut to length, which in turn had to take up substantial deformation work, as shown in FIG. 8, because this piece, as it were, acting as a lever, allows the rounding process.
  • the turntable 11 also has guide disks 12 which are arranged above and below the extruded profile 1 in order to avoid springing open. These plates are not shown in detail in FIGS. 7 and 8.
  • FIGS. 9 and 10 show the core roll bending process at a different point in time, namely, as shown in FIG. 10, when the weld joint has already formed because the finished dimension has been reached.
  • two form rollers 8 are present; by moving in the direction of arrow 27 in one direction or the other, the contact pressure can be increased or decreased in accordance with the desired diameter.
  • FIGS. 2 and 3 it is pointed out that a one-sided pre-bending is also sufficient, so that a two-sided pre-bending does not have to be carried out — as described above in FIGS. 2 and 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP81902307A 1980-07-30 1981-07-30 Procede de preparation d'objets ronds Ceased EP0075599A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3028956 1980-07-30
DE19803028956 DE3028956A1 (de) 1980-07-30 1980-07-30 Verfahren zur herstellung von rundkoerpern

Publications (1)

Publication Number Publication Date
EP0075599A1 true EP0075599A1 (fr) 1983-04-06

Family

ID=6108510

Family Applications (2)

Application Number Title Priority Date Filing Date
EP81201085A Pending EP0045119A1 (fr) 1980-07-30 1981-07-30 Procédé pour la fabrication d'objets ronds
EP81902307A Ceased EP0075599A1 (fr) 1980-07-30 1981-07-30 Procede de preparation d'objets ronds

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP81201085A Pending EP0045119A1 (fr) 1980-07-30 1981-07-30 Procédé pour la fabrication d'objets ronds

Country Status (2)

Country Link
EP (2) EP0045119A1 (fr)
DE (1) DE3028956A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4211065A1 (de) * 1991-06-10 1992-12-17 Banning Gmbh J Verfahren und vorrichtung zur herstellung rotationssymetrischer teile aus metall
DE19949363C2 (de) * 1999-10-13 2001-04-19 Leico Werkzeugmaschb Gmbh & Co Verfahren und Vorrichtung zur Herstellung eines Fahrzeugrades

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4674165A (en) * 1983-06-09 1987-06-23 Spaeth Walter Method for manufacturing rounded parts, such as motor vehicle consisting of wheel rims

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2042610A1 (fr) * 1969-05-13 1971-02-12 Grotnes Machine Works Inc
DE2243293A1 (de) * 1972-09-02 1974-03-07 Lang Ludwig Biegevorrichtung
DE2434108A1 (de) * 1973-11-12 1975-05-15 Grotnes Machine Works Inc Verfahren zum bearbeiten einer schweissnaht von huelsen und einrichtung zum vorbereiten einer offenen huelse zum verschweissen der querkanten
DE2624872A1 (de) * 1976-06-03 1977-12-08 Bohner & Koehle Verfahren zum herstellen von ungeteilten felgen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2042610A1 (fr) * 1969-05-13 1971-02-12 Grotnes Machine Works Inc
DE2243293A1 (de) * 1972-09-02 1974-03-07 Lang Ludwig Biegevorrichtung
DE2434108A1 (de) * 1973-11-12 1975-05-15 Grotnes Machine Works Inc Verfahren zum bearbeiten einer schweissnaht von huelsen und einrichtung zum vorbereiten einer offenen huelse zum verschweissen der querkanten
DE2624872A1 (de) * 1976-06-03 1977-12-08 Bohner & Koehle Verfahren zum herstellen von ungeteilten felgen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4211065A1 (de) * 1991-06-10 1992-12-17 Banning Gmbh J Verfahren und vorrichtung zur herstellung rotationssymetrischer teile aus metall
DE19949363C2 (de) * 1999-10-13 2001-04-19 Leico Werkzeugmaschb Gmbh & Co Verfahren und Vorrichtung zur Herstellung eines Fahrzeugrades

Also Published As

Publication number Publication date
EP0045119A1 (fr) 1982-02-03
DE3028956A1 (de) 1982-03-04

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: SPAETH, WALTER