WO1993001011A1 - Procede pour le cintrage de precision de pieces precintrees en trois dimensions, ainsi que station de cintrage de precision associee - Google Patents

Procede pour le cintrage de precision de pieces precintrees en trois dimensions, ainsi que station de cintrage de precision associee Download PDF

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Publication number
WO1993001011A1
WO1993001011A1 PCT/EP1992/001555 EP9201555W WO9301011A1 WO 1993001011 A1 WO1993001011 A1 WO 1993001011A1 EP 9201555 W EP9201555 W EP 9201555W WO 9301011 A1 WO9301011 A1 WO 9301011A1
Authority
WO
WIPO (PCT)
Prior art keywords
straightening
workpiece
hydraulic
station
plane
Prior art date
Application number
PCT/EP1992/001555
Other languages
German (de)
English (en)
Inventor
Walter Späth
Original Assignee
Spaeth Walter
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 Spaeth Walter filed Critical Spaeth Walter
Priority to JP5501977A priority Critical patent/JPH06504235A/ja
Publication of WO1993001011A1 publication Critical patent/WO1993001011A1/fr

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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
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/10—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts between rams and anvils or abutments

Definitions

  • the present invention relates to a method for straightening three-dimensionally * bent workpieces and a straightening station belonging to them according to the preamble of patent claim 1.
  • the aim is to bend a workpiece as precisely as possible, in particular an elongated metal profile. This is usually done using a bending mold. These bending methods have become known from a number of patent applications which go back to the same applicant.
  • the second category of bending processes relates to bending deformations that work without a bending shape, where the workpiece is bent three-dimensionally in space without a bending template.
  • a number of patent applications are known which go back to the same applicant.
  • the advantage of this second category of bending processes is that they work with relatively little equipment and are therefore inexpensive. However, only a bending accuracy of, for example, + ⁇ 2 - 4 mm can be achieved.
  • the present invention is therefore based on the object of operating the three-dimensional bending, in particular of metal profiles, with high accuracy, using only a small amount of equipment shall be .
  • the invention proposes a method according to the subject matter of claim 1.
  • An essential feature of the method is that an automatic straightening station is now arranged at the exit of the bending machine, which is capable of realigning the three-dimensionally bent workpiece with high accuracy, so that one can work with a relatively inexpensive bending method, which in itself still increases does not lead to high bending accuracy.
  • Metal profiles of this type are increasingly used, for example, in modern motor vehicle construction and replace the conventional passenger cells which are welded together from individual sheet metal parts.
  • the passenger compartment of the motor vehicle is defined in the novel “space” frame profiles and therefore an extremely high level of accuracy is required for the three-dimensional bending of such metal profiles. It is therefore possible, for example, to work with a roll mandrel stretch-bending process that goes back to the same applicant, which is used without a bending mold and which is suitable for continuously processing metal profiles in a continuous process.
  • the final accuracy of the bent metal profiles which is still lacking in this method is then produced by the measuring-straightening station arranged at the exit of the bending station.
  • the three-dimensionally bent workpiece is clamped at at least two clamping points and directed between the hydraulic units arranged between the clamping points.
  • Such hydraulic units work according to the 3-point bending process, i.e. On the one side at the current bending point of the workpiece, two pistons of the piston-cylinder units rest at a distance from one another, while on the opposite side, in the space between the aforementioned pistons, a third piston presses on the workpiece and deforms the workpiece in the direction of the compressive force of this central piston .
  • the measuring-straightening station now consists of a large number of such 3-point bending units, such a 3-point situation, as previously described, not only being created with the help of directly opposite and adjacent hydraulic units, but also with the help of not hydraulic units lying directly next to each other.
  • a mother profile with the desired contour is first scanned by a contour measuring system arranged in the straightening station.
  • This contour measuring system can either be designed without contact or in contact with the workpiece. For reasons of simplification, it is preferred if the contour measuring system is based on the probe principle and one probe is arranged on each hydraulic unit. This saves space and machine effort, because the displacement of the piston of the respective hydraulic unit can now be easily detected with the probe.
  • the piston rods of the associated hydraulic units thus serve at the same time as probes, which are placed on the workpiece and detect the target contour of the nut profile.
  • inventive concept of the present invention also includes other measuring methods, such as optical measuring methods, which touch the target contour of the three-dimensionally bent workpiece without contact.
  • the profile to be straightened is moved into the straightening station and clamped in a second operation.
  • the actual contour of the workpiece is scanned with the same contour measuring system and the difference between the target contour and the actual contour is determined at any point on the workpiece. The number of measuring and alignment points depends on the required accuracy of the three-dimensionally bent workpiece. Then, depending on the correction value determined from the target and actual contour, the same hydraulic unit with which the actual and target contour was recorded at current points on the workpiece is adjusted.
  • Hydraulic units that can be freely assigned to each other form the previously described three-point straightening process, where in the space between two piston rods that are placed on the workpiece from one side, a third piston rod is pressed opposite the workpiece in the space between these two piston rods.
  • the measuring alignment system consists of a box frame; in this longitudinal rails are attached to accommodate ring rails.
  • the distance between these ring rails is infinitely variable in length and can be adjusted to each other with different axial dimensions (moved in parallel).
  • Slides can be freely rotated through 360 ° on these rings on rails. Usually there are two sledges on one common rail are arranged; if necessary, any more can be arranged. The longitudinal and circular adjustment is done manually (can also be done by motor).
  • a tensioning and transport system located in the longitudinal center receives a bent (spatially curved) bent part.
  • An imaginary neutral center axis + _ 0 serves to accommodate the bent part (at least 2 stops in + _ O axis).
  • the spatial contour is measured with reference to this zero axis. It is assumed that the curved contour corresponds exactly to the target dimension. You can measure with the linear units.
  • An AC hydraulic cylinder records the measured value, which takes the contour at the measuring points to the + _ zero axis. This results in a certain number of coordinate points in space. A spatial contour can thus be precisely determined.
  • the sensors on the linear units measure the difference between the actual and target status.
  • the computer now sets the linear cylinder in motion and uses a linear pressure to correct the curve at certain points on the contour of the curved profile.
  • 3-point bending is used in several sequences.
  • P, I,, 2, 2 ', 3, 3', 4.4 ' II and 1.2 like 4.1 and 4.2 have their own ring, ie I and II as well as 1.2 belong to a system, so also 4 'and 4.1 and 4.2.
  • Each linear unit therefore has an axis that can be controlled via CNC.
  • a handling system e.g. a three-dimensionally curved frame is placed on the extended clamping system and fastened (clamping jaws) in a predetermined spatial position. After inserting the frame, measurement and straightening begin immediately.
  • the bent part After straightening, the bent part is brought to the export station and transported on by another handling system.
  • the clamping system moves back into the insertion station and picks up the next bent part in time with the bending process.
  • the AMRIS consists of one or more straightening units.
  • a straightening unit consists of 3 linear measuring straightening stamps per side.
  • Measuring pressure 2 belongs together counter pressure i '+ 3
  • control means that the system can be varied continuously along the longitudinal axis, e.g.
  • Measuring pressure 3 belongs together Counter pressure 2 '+ 4'
  • the linear-measuring-straightening units can also be swiveled in the longitudinal direction to ensure that the measuring-straightening plungers are placed at right angles on the shaped profile.
  • Figure 1 schematically shows a perspective front view of the straightening station
  • Figure 2 the straightening principle of the straightening station according to Figure 1 in one plane
  • Figure 3 schematically a machine structure
  • Figure 4 the directional principle in a plane perpendicular to Figure 2;
  • Figure 5 a modification of the directional principle compared to Figure 2;
  • Figure 6 schematically in side view the upper part of the mounting of a longitudinal rail for holding a hydraulic unit.
  • the workpiece 8 to be straightened is clamped in a box frame 7 at its two ends at the clamping points 9, 10.
  • FIG. 3 also shows that the clamping point 9 is designed as a fixed point 11 (immovable), while the clamping point 10 is designed to be displaceable in the direction of the arrows 12. In this way, build-up of mechanical stresses during the straightening of the workpiece is avoided and such stresses result in changes in length u set and move the clamping point 10 in the arrow directions 12
  • reference points 51, 52, 53, 54 ... etc. are now set at infinitesimally small intervals. Defined, the number and the distance of the alignment points depend on the required accuracy and on the type and design of the workpiece.
  • Each directional point 51 54 lies in the plane of a circular disk 41-45, with each circular disk also being defined as a straightening plane 31-36.
  • circular disk 41-45 means that the outer circumference of each circular disk 41-45 is defined by an annular rail 57 (FIG. 6) and that hydraulic units 1-6; 1 '-6 * are arranged.
  • clamping point 9 is also arranged in the region of a circular disk 10, just like that Clamping point 10 is arranged in the area of a circular disk 45.
  • Both circular disks 40, 45 are in turn defined on their outer circumference by an annular rail 57, in the area of which a large number of hydraulic units are slidably arranged, as is symbolized by the four arrows in the area of the circular disk 40 and in the area of the circular disk 45.
  • each hydraulic unit 1-6 and 1'-6 ' is coupled to a length measuring system, so that, according to FIG. 1, the target contour of a workpiece 8 can be detected in the area of the guide points 51-54 by the hydraulic units 1-6 and l'-6 'are brought up to the workpiece until they are seated on the outer circumference of the workpiece with a defined force that does not lead to a deformation of the workpiece 8.
  • the then associated displacement of the individual piston rods of the hydraulic units is then communicated to the respective length measuring system and a target contour of the workpiece to be measured is formed from this in a connected computer.
  • each circular disk 41-44 defines a straightening plane 31-36, a 3-point straightening method being used.
  • the hydraulic units in the area of the alignment points 51-54 can be rotated through an angle of rotation of 360 ° and thus act at any point on the circumference of the workpiece 8 to be straightened and exert pressure there.
  • FIG. 3 shows a schematic diagram of a mechanical implementation of a system according to the invention for carrying out the method.
  • a cutting knife 14 is arranged at the output, which is in the direction of the arrow 15 is movable and cuts the workpiece bent by the bending machine 13.
  • the workpiece is gripped at one end by a clamping carriage 20 ′, which is arranged with its slide on a conveyor belt 18, which can be moved in the direction of arrow 19 and in the opposite direction.
  • the clamping carriage 20 ' is moved in the direction of arrow 19 into its position 20, so that the workpiece 8 is moved into the region of the directional station 27.
  • Straightening station 27 is assigned to an export station 21, which also has a clamping carriage 22 which can be moved in the direction of arrow 24 with a conveyor belt 23.
  • the conveyor belts 18 and 23 are driven by corresponding motors 25.
  • the hydraulic units 1-6 and l'-6 'of the straightening station 27 are supplied with pressure oil by a hydraulic unit 29, which hydraulic unit 29 is driven by a motor 28. As explained with reference to FIG. 1, the workpiece is clamped in such a way that the clamping points 9, 10 are as far as possible in the neutral central axis 30 (see FIG. 1).
  • each hydraulic unit according to FIG. 4 can be displaced in this plane in the area of its circular disk 41 by a pivoting range 37 of, for example, 90 °, so that the hydraulic unit 1 can be pivoted into the positions 1 "or 1 '*'.
  • the hydraulic unit 1 ' which is also displaceable in the other swivel ranges.
  • FIG. 5 also shows that the hydraulic units 1-6 and l'-6 'can be inclined by an angular range 38 in order to ensure that they always touch the surface of the workpiece 8 in their assigned direction. That is, the inclination of the hydraulic units 1-6 and l'-6 'is adjustable and lockable.
  • FIG. 6 shows a mechanical implementation, for example a first slide 49, which carries an annular rail 57, is arranged on an upper side member 47 of the box frame 7 (see FIG. 1).
  • the ring rail 57 defines the outer circumference of a circular disk 40-45.
  • the piston rod 58 rests with its punch 59 on the surface of the workpiece to be straightened.
  • the stamp 59 can be adapted to the surface of the workpiece in order to ensure a positive fit.
  • the piston rod 58 is arranged displaceably in the direction of arrow 60 in the hydraulic unit, the length measuring device 61 described being arranged on the piston rod -58. It goes without saying that the length measuring device 61 is also arranged on the other cylinder side of the hydraulic unit, ie on the back of the cylinder.
  • the hydraulic unit 1 is held in the carriage 55 with a locking screw 50 in order to ensure a first adjustment movement by hand on the workpiece. This can be used to ensure a specific zeroing of the respective hydraulic device.
  • the carriage 49 is arranged on the longitudinal beam 47 so that it can move in the direction of the arrows 48, the mutual distance between the circular disks 40-45 can thus be set continuously and the distance between the reference points 51-54 can thus be set continuously.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

Un procédé pour le cintrage de précision de pièces précintrées en trois dimensions, en particulier de profilés métalliques, prévoit qu'à la sortie d'une cintreuse, dans laquelle les pièces sont cintrées jusqu'en trois dimensions, soit disposée une station de cintrage de précision automatique et que la pièce à cintrer avec précision soit maintenue par au moins deux points de serrage, puis cintrée avec précision par des unités hydrauliques disposées entre les points de serrage.
PCT/EP1992/001555 1991-07-12 1992-07-09 Procede pour le cintrage de precision de pieces precintrees en trois dimensions, ainsi que station de cintrage de precision associee WO1993001011A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5501977A JPH06504235A (ja) 1991-07-12 1992-07-09 立体的に折り曲げられた加工品を正しく調整する方法およびこれに付属の調整ステーション

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4123035.3 1991-07-12
DE19914123035 DE4123035A1 (de) 1991-07-12 1991-07-12 Verfahren zum richten von dreidimensional gebogenen werkstuecken und hierzu gehoerende richtstation

Publications (1)

Publication Number Publication Date
WO1993001011A1 true WO1993001011A1 (fr) 1993-01-21

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ID=6435951

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/001555 WO1993001011A1 (fr) 1991-07-12 1992-07-09 Procede pour le cintrage de precision de pieces precintrees en trois dimensions, ainsi que station de cintrage de precision associee

Country Status (4)

Country Link
EP (1) EP0548322A1 (fr)
JP (1) JPH06504235A (fr)
DE (1) DE4123035A1 (fr)
WO (1) WO1993001011A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0673693A1 (fr) * 1994-03-24 1995-09-27 G.D. Bracker & Söhne Maschinenbaugesellschaft mbH Méthode et appareil pour le redressement et la mesure d'un profilé en métal, en particulier d'un rail

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19527358B4 (de) * 1995-07-26 2004-11-04 Tmg Tiefbau-Material Gmbh Maschine zum Richten verformter Stahlspundbohlen
DE102021121403A1 (de) 2021-08-18 2023-02-23 Laubinger + Rickmann GmbH & Co. KG Richtanlage und Verfahren zum Richten eines länglichen Profilbauteils

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1527434A1 (de) * 1963-03-19 1969-12-18 Truninger Ag Streckmaschine zum Streckrichten von Streckgut,insbesondere Hohlprofilen aus Stahl
FR2377853A1 (fr) * 1977-01-21 1978-08-18 Galdabini Renzo Machine a dresser automatique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH349867A (fr) * 1957-07-17 1960-10-31 Huet Andre Machine à rectifier l'alignement des cintres d'un serpentin tubulaire
DE2346796A1 (de) * 1973-09-17 1975-04-03 Eitel Kg Werzeugmaschinenfabri Automatisches richtverfahren und richtmaschine dafuer mit mehreren richtstellen
SE426558B (sv) * 1981-04-01 1983-01-31 Mensor Ab Adaptivt forfarande och anordning for att korrigera foremals formavvikelse
JP3371909B2 (ja) * 1990-06-18 2003-01-27 セイコーエプソン株式会社 インクジェットヘッド

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1527434A1 (de) * 1963-03-19 1969-12-18 Truninger Ag Streckmaschine zum Streckrichten von Streckgut,insbesondere Hohlprofilen aus Stahl
FR2377853A1 (fr) * 1977-01-21 1978-08-18 Galdabini Renzo Machine a dresser automatique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0673693A1 (fr) * 1994-03-24 1995-09-27 G.D. Bracker & Söhne Maschinenbaugesellschaft mbH Méthode et appareil pour le redressement et la mesure d'un profilé en métal, en particulier d'un rail

Also Published As

Publication number Publication date
DE4123035A1 (de) 1993-01-21
EP0548322A1 (fr) 1993-06-30
JPH06504235A (ja) 1994-05-19

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