EP0371960A2 - Procédé pour cintrer des matériaux en forme de barre - Google Patents

Procédé pour cintrer des matériaux en forme de barre Download PDF

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Publication number
EP0371960A2
EP0371960A2 EP90100974A EP90100974A EP0371960A2 EP 0371960 A2 EP0371960 A2 EP 0371960A2 EP 90100974 A EP90100974 A EP 90100974A EP 90100974 A EP90100974 A EP 90100974A EP 0371960 A2 EP0371960 A2 EP 0371960A2
Authority
EP
European Patent Office
Prior art keywords
bending
angle
slide
bent
mandrel
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.)
Granted
Application number
EP90100974A
Other languages
German (de)
English (en)
Other versions
EP0371960B1 (fr
EP0371960A3 (en
Inventor
Helmut Zahlaus
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.)
Ruhl Heinz
Original Assignee
Ruhl Heinz
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25850880&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0371960(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from US06/839,688 external-priority patent/US4702097A/en
Priority claimed from DE19863644482 external-priority patent/DE3644482A1/de
Application filed by Ruhl Heinz filed Critical Ruhl Heinz
Publication of EP0371960A2 publication Critical patent/EP0371960A2/fr
Publication of EP0371960A3 publication Critical patent/EP0371960A3/de
Application granted granted Critical
Publication of EP0371960B1 publication Critical patent/EP0371960B1/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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
    • B21D11/12—Bending specially adapted to produce specific articles, e.g. leaf springs the articles being reinforcements for concrete

Definitions

  • the invention relates to a method and an apparatus for bending rod-shaped materials such as reinforcing steels comprising bending slides, each with a bending mandrel and a bending crank arranged rotatably around the latter, the rod-shaped material being gripped and bent by the bending slides in such a way that a section of the material alternately is immovably fixed by one of the bending slides, during which the bending sled not holding the material bends the material or is displaced along it.
  • EP-A-0 121 896 describes a device for bending rod-shaped materials, which comprises two bending slides, each with a mandrel with an associated bending crank. A section of material is held by a bending slide during the bending process. The other bending slide is used to bend. So that the material is not displaced during bending, so that the non-bending bending slide firmly holds the material, it is necessary that the material is already plastically deformed in this section.
  • the object of the present invention is to develop a method of the type described in the introduction in such a way that a bending process is possible in which any desired bending shapes are possible with high accuracy, with other bending slides in addition to the bending slides facilities holding the material are not required. Furthermore, the invention is based on the object of developing a device in such a way that the movement of the bent material section is not impeded by the bending slide. Finally, the possibility of a problem-free material supply and dispensing should be possible.
  • the object is achieved on the one hand in that, for the immovable fixing of the material, a section which interacts with a bending slide and is not bent is bent by an angle which leads exclusively to an elastic deformation.
  • the bending slide can also hold rod material when it is still undeformed. This is not possible according to the state of the art. This has the particular advantage of using materials to e.g. To form Z-shapes or modifications of these.
  • the elastic deformability of the material is taken into account. Accordingly, if the material is bent by an angle that does not yet lead to permanent deformation, it is ensured that the material is held securely by the bending slide, so that the other bending slide can be displaced to the required extent and, if necessary, can carry out the plastic deformation.
  • the angle which can also be referred to as the spring-back angle, is added to each nominal angle, that is to say the angle to be bent, in order to ensure that the plastically deformed section also has the desired geometry when the bending carriage no longer acts. Accordingly, the angle should be the angle by which the material is maximally bendable without plastic deformation. The angle is therefore also the spring-back angle.
  • a further embodiment of the invention is characterized in that when a closed bending mold is bent in, the material present in the region of a bending mandrel is bent over the bending mandrel via material to be bent, for example via a transfer plate. As a result, the further bending process is not hindered. Further details, advantages and features emerge both from the claims, the features to be extracted from them - individually and / or in combination -, the following description and exemplary embodiments shown in the drawing, the drawing without any further explanations being required. essential features of the teaching according to the invention can be seen, even if they are not described in more detail.
  • a bending machine (10) is schematically shown in plan view, which comprises a horizontally lying processing table.
  • two bending slides (14) and (16) are displaceably arranged in the longitudinal direction of the processing table, by means of which the preferably rod-shaped steel materials (18) to be introduced into the bending machine (10) are to be bent, as described in more detail below.
  • These bars (18) enter the machine from a material store (20), it being possible for a plurality of bars (18) to be bent simultaneously by means of the bending slides (14) and (16).
  • the material store (20) can be part of a processing line shown schematically in FIG. 3, which is arranged between the bending machine (10) and a bar cutting machine (22).
  • the rod cutting machine can obey a principle as described in German patent application 32 06 673 by the same applicant.
  • the material store (20) which can be a bending carriage runway, also serves as a buffer.
  • the use of the machine (10) in a processing line has the advantage that there is a high throughput without the need for further explanations.
  • the bending machine (10) can be programmed via a keyboard (24) in order to cold-deform the materials (18) to the desired extent.
  • the work surface (12) has a vertical or almost vertical slot for receiving several round materials to be arranged one above the other, which is laterally delimited by the bending slides (14) and (16).
  • a container (26) is also indicated, into which the bent materials (29) are thrown by hand can.
  • an automatic ejection device is integrated in the machine (10).
  • Each bending slide (14) or (16) consists of a bending crank (28), a bending mandrel (30) and a drive (32), (34), (36) or (38).
  • the bending crank (28) moves at a distance around the bending mandrel (30).
  • the materials to be deformed are then located between the bending crank (28) and the bending mandrel (30). As indicated in Fig.
  • the bending crank (28) comprises an eccentrically mounted roller mandrel (40), which may be rotatable about its axis, and which is in the desired position via two opposing threads (42) and (44) (infinitely adjustable axis distance bending roller (40), Bending mandrel (30)) is fixed immovably, so that the bending mandrel (40) cannot be released regardless of the direction of rotation of the bending crank (28).
  • the bending crank (28) is also received eccentrically by a shaft (46) which is connected to one of the hydraulic cylinders (36) or (38).
  • the longitudinal movement of the hydraulic cylinder (36) or (38) is converted into the desired rotary movement via a chain (48).
  • the chain (48) interacting with the shaft (46) is connected at one end to the hydraulic cylinder (36) or (38) and at the other end via a spring-loaded element (50).
  • the exact structure and the mode of operation can easily be seen from FIG. 4.
  • the translational movement of the bending slide (14) or (16) itself preferably takes place via hydraulic motors (32) and (34) with a rotary output movement.
  • Both the hydraulic cylinders (36) and (38) and the hydraulic motors (32) and (34) can be located in a hydraulic circuit (52), one motor M two pumps (56) actuated, which are connected in parallel. If the elements (36), (38), (32) and (34) are arranged in a single circuit (52), there is the advantage that all drive means can be operated with a single unit, so that complex monitoring and Control devices are not required.
  • the individual drive means (32), (34), (36), (38) in the circuit (52) are now arranged as follows.
  • the first hydraulic motor (32) is located behind the pump (56) conveying the operating medium (54).
  • the second hydraulic motor (34) is arranged in the circuit behind the first hydraulic motor (32).
  • the hydraulic cylinders (38) and (36) follow to close the circuit.
  • the connection between the circuit (52) and the drive elements (32) to (38) is established via solenoid valves (58), (60), (62) and (64). If all valves (58) to (64) are closed, the equipment (54) runs freely in the circuit (52).
  • valve (60) activated in such a way that a connection to the hydraulic motor (32) is carried out - consequently a connection PB / AT or PA / BT is established - so can otherwise not activated valves (62), (64) and (58) the equipment continues to flow back immediately without pressure.
  • the valve (62) is also actuated, i.e. if both bending slides (14) and (16) are to be displaced at the same time, the hydraulic motor (34) is acted upon by the return fluid of the motor (32) without the independence of the actuation being canceled thereby becomes. Accordingly, the return fluid of the engine (34) can act on the hydraulic cylinders (38/36).
  • the advantage of the tandem pump arrangement according to FIG. 2a is that, with different delivery volumes of the pumps (56), a change in speed can easily be achieved by optionally switching one of the pumps on and off.
  • An essential feature of the invention is that during the bending process, a section of the material is held between the mandrel and the bending crank in such a way that when the other bending slide is moved along the material, it cannot move.
  • a corresponding bending process will now be explained in more detail with reference to FIGS. 6 to 8.
  • the individual parts of the bending slide shown are not described in detail. Rather, the bending slide can have a structure as described in more detail in connection with FIGS. 4, 5.
  • a rod-shaped material such as reinforcing steel (142) is to be bent on both sides with respect to its longitudinal axis.
  • two bending slides (144) and (146) are used, which alternately hold the material (142) precisely in position and bend to the desired extent.
  • the bending slide (144) holds the material (142) in position A. Since the material is not yet to be bent, it is first bent at an angle. The angle depends on the rod material. The angle is like this great that the material is only elastically and not plastically deformed. However, since the material is bent by the angle - there is a clamping between the bending mandrel (148) and the bending crank (150), namely in the broken line of position A.
  • the bending slide (146) which can also be referred to as a bending stick , is in position Z. If the end of the material (142) is now to be bent by the angle -, the bending crank (152) is rotated around the bending mandrel (154) of the bending block (146) by the angle +, the The angle corresponds to the angle by which the material springs back when the bending crank (152) no longer acts on the material (142) in the region of the end.
  • the elastic deformation can of course be canceled by the bending carriage (146) after the beginning of the bending process are, ie the bending crank (150) returns to the basic position (solid line). It is important, however, that at least when moving one of the bending slides, the other clamps the material.
  • the material (142) is clamped again by the bending stick (144) (that is to say bending by the angle).
  • the bending stick (144) can open again to release the clamping.
  • the bending stick (146) then bends the material (142) again in the Y position.
  • the bending stick (144) should only finally release the clamping when the bending stick (146) has already initiated the bending process to ensure that the material (142) cannot be moved along its longitudinal axis during the bending.
  • the bending slide (146) in the position X shifted.
  • the bending carriage (144) clamps the material (142) again.
  • the rod (142) is then turned through 180 °.
  • the bending slides (146) and (144) must release the material.
  • the bending slide (144) should bend the associated end.
  • the bending stick (146) is clamped by elastic deformation of the material (142) (bending by the angle), in order then to rotate the bending crank (150) around the bending mandrel (148) to the desired extent.
  • the angle of rotation is equal to the desired angle, which corresponds to the angle at which there is only an elastic but no plastic deformation of the material.
  • each bending slide (144) or (146) can clamp the rod material (142) by utilizing the elastic property of the material. The clamping takes place at least when one of the bending slides (144) or (146) moves along the material (142).
  • FIG. 8 A further bending process can be seen from FIG. 8, which is carried out via bending slides or bending sticks (156) and (158).
  • a bending slide (156) or (158) is moved, the other bending slide (158) or (156) is in a clamping position.
  • the material (160) to be deformed is bent between the bending slides (156) and (158) (dashed line). This shows that, in order to rule out any distortion of the length, the clamping is only to be carried out during the process, whereas the clamping position is canceled during the bending, so that the slide carrying out the bending process the Material can bend at the point corresponding to the actual length.
  • the bending process takes place as follows.
  • the rod material (160) is first plastically deformed in position C of the bending slide (156) and in position W of the bending slide (158).
  • the bending carriage (158) then clamps the rod material (160) so that the bending carriage (156) can move into position D.
  • the material (160) is bent during the process. During the bending process in position D, however, the clamping action of the bending slide (158) is released, so that the material (160) assumes the position that is indicated by the solid line. After bending in position D, the material (160) is clamped again by the bending slide (158).
  • the filled or open rectangles drawn in the bending slide (156) and (158) above the material (160) represent the counterholders (136) shown in FIG. 1, which are intended to prevent the material (160) from bending during bending. These counterholders are attached to the bending slide so that they cannot represent any hindrance when they are moved. Any bends can be made, the material itself can optionally be rotated about its longitudinal axis. This ensures that when moving a bending slide, the material itself is held firmly and can still be rotated as desired after the process.
  • the rod material (142) can no longer be displaced in length in its elastic deformation due to the interaction between the bending roller (150) and the bending mandrel (148).
  • the counterforces caused by the bending roller (150) and the bending mandrel (148) together with the coefficient of friction of the rod material (142) are sufficient to prevent the material from being displaceable in length; Otherwise, the force acting in the longitudinal direction would not only have to overcome the forces and frictional forces caused by the above-mentioned elements, but also continuously bend the material so that it can slide out of the area between the bending crank (150) and bending mandrel (148), in both Directions.
  • the angle (clamping angle) is selected such that the material is only elastically and not plastically deformed, ie that when the bending crank (150) is moved back, the material is moved back to its starting position.
EP19900100974 1986-03-14 1987-03-16 Procédé pour cintrer des matériaux en forme de barre Expired - Lifetime EP0371960B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US06/839,688 US4702097A (en) 1983-04-06 1986-03-14 Process for the bending of rod-like materials
US839688 1986-03-14
DE19863644482 DE3644482A1 (de) 1986-12-24 1986-12-24 Vorrichtung zum bearbeiten von stangenmaterial
DE3644482 1986-12-24

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP87103810.5 Division 1987-03-16

Publications (3)

Publication Number Publication Date
EP0371960A2 true EP0371960A2 (fr) 1990-06-06
EP0371960A3 EP0371960A3 (en) 1990-06-20
EP0371960B1 EP0371960B1 (fr) 1993-10-06

Family

ID=25850880

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19870103810 Revoked EP0238026B1 (fr) 1986-03-14 1987-03-16 Procédé et dispositif pour cintrer des matériaux en forme de barre
EP19900100974 Expired - Lifetime EP0371960B1 (fr) 1986-03-14 1987-03-16 Procédé pour cintrer des matériaux en forme de barre

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19870103810 Revoked EP0238026B1 (fr) 1986-03-14 1987-03-16 Procédé et dispositif pour cintrer des matériaux en forme de barre

Country Status (2)

Country Link
EP (2) EP0238026B1 (fr)
GR (1) GR3002783T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0537496A1 (fr) * 1991-10-15 1993-04-21 M.E.P. Macchine Elettroniche Piegatrici S.p.A. Méthode pour cintrer des bouts de barres pour la construction civile avec des cintreuses coupantes, et cintreuses coupantes utilisant la méthode
US7610788B2 (en) 2005-11-15 2009-11-03 Antonios Anagnostopoulos Machine and method for preventing torsion of wire, material of prismatic cross-section, and rod material
CN103658450A (zh) * 2013-11-12 2014-03-26 梁明光 一种钢筋折弯机的自动夹料机构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3919607C2 (de) * 1989-06-15 1994-05-05 Heinz Ruhl Vorrichtung zum Biegen von stabförmigem Material
IT1248134B (it) * 1991-02-28 1995-01-05 A C M Srl Automatismi Costruzi Gruppo piegatore per fasci di barre
AT501151B8 (de) * 2004-11-24 2007-02-15 Univ Fuer Angewandte Kunst Wie Verfahren zur ansteuerung von biegemaschinen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1752716A1 (de) * 1968-07-05 1971-07-15 Ernst Stegmann Verfahren zum maschinellen Biegen von Draht- und Bandmaterial und Maschine zur Durchfuehrung des Verfahrens
DE2164026A1 (de) * 1970-12-23 1972-07-13 Benton, Ronald Edward, Cheam, Surrey (Großbritannien) Biegevorrichtung und Verfahren zum Herstellen von Biegungen
US4161110A (en) * 1977-04-28 1979-07-17 EVG Entwicklungs- und Verwertungs-Gesellschaft mbH. Automatic control device for a bending machine
EP0032656A2 (fr) * 1980-01-16 1981-07-29 EVG Entwicklungs- u. Verwertungs- Gesellschaft m.b.H. Installation pour la fabrication de brides de formes et de grandeurs différentes, spécialement des brides d'armature de béton
EP0121896A2 (fr) * 1983-04-06 1984-10-17 Ruhl, Heinz Procédé pour et dispostif à cintrer des matériaux en forme de barre

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3206673A1 (de) 1982-02-25 1983-09-01 Helmut 6230 Kriftel Zahlaus Vorrichtung zum zuschneiden von stabfoermigen materialien

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1752716A1 (de) * 1968-07-05 1971-07-15 Ernst Stegmann Verfahren zum maschinellen Biegen von Draht- und Bandmaterial und Maschine zur Durchfuehrung des Verfahrens
DE2164026A1 (de) * 1970-12-23 1972-07-13 Benton, Ronald Edward, Cheam, Surrey (Großbritannien) Biegevorrichtung und Verfahren zum Herstellen von Biegungen
US4161110A (en) * 1977-04-28 1979-07-17 EVG Entwicklungs- und Verwertungs-Gesellschaft mbH. Automatic control device for a bending machine
EP0032656A2 (fr) * 1980-01-16 1981-07-29 EVG Entwicklungs- u. Verwertungs- Gesellschaft m.b.H. Installation pour la fabrication de brides de formes et de grandeurs différentes, spécialement des brides d'armature de béton
EP0121896A2 (fr) * 1983-04-06 1984-10-17 Ruhl, Heinz Procédé pour et dispostif à cintrer des matériaux en forme de barre

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0537496A1 (fr) * 1991-10-15 1993-04-21 M.E.P. Macchine Elettroniche Piegatrici S.p.A. Méthode pour cintrer des bouts de barres pour la construction civile avec des cintreuses coupantes, et cintreuses coupantes utilisant la méthode
US7610788B2 (en) 2005-11-15 2009-11-03 Antonios Anagnostopoulos Machine and method for preventing torsion of wire, material of prismatic cross-section, and rod material
CN103658450A (zh) * 2013-11-12 2014-03-26 梁明光 一种钢筋折弯机的自动夹料机构

Also Published As

Publication number Publication date
EP0371960B1 (fr) 1993-10-06
GR3002783T3 (en) 1993-01-25
EP0238026A1 (fr) 1987-09-23
EP0238026B1 (fr) 1991-06-26
EP0371960A3 (en) 1990-06-20

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