EP1494825A1 - Method and machine for bending of wire rods, wires, tubes or other material of prismatic cross section - Google Patents

Method and machine for bending of wire rods, wires, tubes or other material of prismatic cross section

Info

Publication number
EP1494825A1
EP1494825A1 EP03710055A EP03710055A EP1494825A1 EP 1494825 A1 EP1494825 A1 EP 1494825A1 EP 03710055 A EP03710055 A EP 03710055A EP 03710055 A EP03710055 A EP 03710055A EP 1494825 A1 EP1494825 A1 EP 1494825A1
Authority
EP
European Patent Office
Prior art keywords
bending
pins
pin
fixed
plane
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
EP03710055A
Other languages
German (de)
French (fr)
Other versions
EP1494825B1 (en
Inventor
Antonios Anagnostopoulos
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.)
ANAGNOSTOPOULOS, ANTONIOS
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 EP1494825A1 publication Critical patent/EP1494825A1/en
Application granted granted Critical
Publication of EP1494825B1 publication Critical patent/EP1494825B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 present invention refers to a method and a mechanism for bending in various forms, mainly straightened steel re-bars but also any other straightened material of prismatic cross section.
  • the cross section dimensions range today, with rod diameter ranging currently from 6 or 8 mm up to 40mm.
  • the produced pieces are mainly used in construction and generally in manufacturing projects as concrete reinforcing material and as structural elements in metal constructions.
  • the various product geometries, shown in figure 1 are produced by originally straightened rods, which are undergoing consecutive bending operations at both ends at the appropriate angle, without excluding bending in the middle part.
  • the products may be symmetric about an axis, as in figure la, or symmetric about a point, as in figure lc, or asymmetrical, as in figure lb and d.
  • the bending angles are usually 90° but they can also vary depending on particular construction requirements.
  • the various product geometries, shown in figure 1 are produced by originally straightened rods, undergoing successive bending operations at the desired angles, starting from the rod ends and proceeding towards the inner section but not necessarily the middle of the rod.
  • the bending mechanisms are now able to implement bending angles at the opposite direction. Transferring of the semi-finished product is a disadvantage for this method.
  • the three grippers which are necessarily required, are located at large distances with each other, and hence lifting, transfer and relocation on the bending mechanisms is implemented slowly and in a complicated manner.
  • the purpose of this invention is to present a method, which resolves the problems exhibited by existing methods and machines, and which leads to fabrication of a machine, which allows bending in both directions in a simple, quick and reliable manner.
  • the objective of the present invention is the development of a machine, which automates the process for production of various products, allows bending in both directions, is very flexible, very simple in design, user friendly and reliable in operation.
  • the method of the present invention is explained in the form of an example, as in figure 3, where the process for production of the piece shown in figure 2 is schematically described.
  • the product shown in figure 2 is formed by a straightened part of appropriate length and is characterized by the lengths and angles xl, ⁇ l and x2, ⁇ 2 at the left end and the lengths and angles yl, ⁇ l and y2, ⁇ 2 at the right end.
  • the straightened wire (1) is placed on the bending units (6).
  • the bending units (6) consist of a fixed pin (2), which is located along the bending mechanism's rotation axis and of a rotating pin (3), able to rotate about the fixed pin.
  • the two pins (2) and (3) are placed on a flat disc (4).
  • the bending pins alone or with their mechanisms can be withdrawn from the bending plane, where the material to be bent is placed, so that the material to be bent is no more entrapped between the pair of pins (2) and (3).
  • the material to be bent (1) is held by a gripper (5), which is located at the interior side of the bending mechanism.
  • the grippers (5) can move transversely to the longitudinal axis of the material (1).
  • the process for production of the piece of figure 2 is the following :
  • the straightened material (1) is placed, as in figure 3a, between the pins (2) and (3) of the two bending units, which are located at distances xl and yl from the left and the right end respectively.
  • the bending units and the grippers move towards the inner section of the semifinished product, at x2 for the left one and at x2 for the right one, as in figure 3d.
  • the bending pins (2) and (3) and the discs (4) or alternatively, the bending pins (2) and (3) only are withdrawn under the bending plane, as in figure 3e, so that the material to bent is freed.
  • the elements under the plane of bending are drawn with a broken line.
  • frame (6) executes motion Zl, driven by a motor (13), which drives it via a rack (12) and pinion assembly.
  • the machine is presented schematically in figure 5. It consists of two bending mechanisms, which are placed on two moving frames (6a) and (6b) for the left and right carriers, which are placed on the metal structure (7) and can move along guides.
  • the moving frames are relocated at the appropriate locations for performing the first bending operation at the left and right ends.
  • the material to be bent (1) is placed manually or automatically on the bending mechanisms. Next, both the two bending mechanisms perform bending. The bending mechanisms return to their initial position and the process of the successive bending operations follows, as presented in the explanation of the present method.
  • bending can be implemented in two ways. They can be successive, with one mechanism restraining and bending, while the other mechanism is moving towards the next bending location.
  • a gripper at the interior section can be activated, in order to restrain the material to be bent, while the two bending mechanisms bend simultaneously and move simultaneously towards another location. In this case, the gripper can move transversely to the axis of the material, just like the grippers on the bending mechanisms.

Landscapes

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

Abstract

Method and machine for bending of wire rods, wires, tubes or other material of prismatic cross section (1), which is characterized by a bending mechanism consisting of a fixed pin (2) and a rotating pin (3), where pin (3) bends the material (1) around the fixed pin (2). The two pins (2, 3) can be withdrawn under th eplane of bending and the rotating pin (3) can rotate about the fixed pin (2) for up to 180°. Simultaneously, a gripper (5) transports the material (1) to the opposite side of the fixed pin (2). The two pins (2 and 3) return on the plane of bending, entrap the material (1) and bend it to the opposite direction. The machine consists of two bending mechanisms, which can move from the material ends towards an interior material section and bend the material (1) towards both sides, according to the proposed method.

Description

METHOD AND MACHINE FOR BENDING OF WIRE RODS, WIRES, TUBES OR OTHER MATERIAL OF PRISMATIC CROSS SECTION
The present invention refers to a method and a mechanism for bending in various forms, mainly straightened steel re-bars but also any other straightened material of prismatic cross section. Currently, it is applied mainly at long pieces, with length ranging from lm to 16m, with simultaneous bending of one or more materials. The cross section dimensions range today, with rod diameter ranging currently from 6 or 8 mm up to 40mm.
The produced pieces are mainly used in construction and generally in manufacturing projects as concrete reinforcing material and as structural elements in metal constructions.
The various product geometries, shown in figure 1, are produced by originally straightened rods, which are undergoing consecutive bending operations at both ends at the appropriate angle, without excluding bending in the middle part. The products may be symmetric about an axis, as in figure la, or symmetric about a point, as in figure lc, or asymmetrical, as in figure lb and d. The bending angles are usually 90° but they can also vary depending on particular construction requirements. The various product geometries, shown in figure 1, are produced by originally straightened rods, undergoing successive bending operations at the desired angles, starting from the rod ends and proceeding towards the inner section but not necessarily the middle of the rod. In figure la and b bending is implemented by rotation towards one direction, whereas in figure lc and d bending is implemented towards both directions. The usual process for production of these pieces is the following: Two bending mechanisms, which move along guides from the ends of the initially straightened rod towards the middle section, execute successive bending operations. The material to be bent is usually restrained by a gripper at some point at the middle section. Bending is implemented by wrapping the rod around a pin, where the pin diameter specifies the curvature radius of the bent rods. The curvature radius of the product at the bending locations is proportional to the rod diameter, according to regulations. In order to implement bending towards both directions, two fixed and two rotating pins are used. Even though this solution is simple as a mechanical construction, in case of large diameter material, it results in large bending mechanisms, which cannot move very close to each other, and therefore do not allow for formation of pieces with short sides. In addition, the two rotating pins cannot form 180° angles.
In order for the bending mechanisms to move very close to each other, some manufacturers employ only one fixed pin and one rotating pin. These bending mechanisms can only bend the material towards one direction and they can form, completely automatically, products where bending is implemented towards one direction only, such as in figure la and b. For bending operations towards the other direction, the machine operator must intervene and manually bend the semi-finished piece in order to implement the opposite direction bending. In order to avoid manual intervention, some manufacturers developed a transfer mechanism, where grippers hold the semi-finished product, remove it from the plane of bending, and transport it in a parallel direction to the opposite side of the fixed pin, consequently the rotating pin is rotated by 180°, and the grippers relocate the semi-finished product on the bending mechanisms. The bending mechanisms are now able to implement bending angles at the opposite direction. Transferring of the semi-finished product is a disadvantage for this method. In the case of long pieces, the three grippers, which are necessarily required, are located at large distances with each other, and hence lifting, transfer and relocation on the bending mechanisms is implemented slowly and in a complicated manner.
The purpose of this invention is to present a method, which resolves the problems exhibited by existing methods and machines, and which leads to fabrication of a machine, which allows bending in both directions in a simple, quick and reliable manner. The objective of the present invention is the development of a machine, which automates the process for production of various products, allows bending in both directions, is very flexible, very simple in design, user friendly and reliable in operation.
The method of the present invention is explained in the form of an example, as in figure 3, where the process for production of the piece shown in figure 2 is schematically described. The product shown in figure 2 is formed by a straightened part of appropriate length and is characterized by the lengths and angles xl, αl and x2, α2 at the left end and the lengths and angles yl, βl and y2, β2 at the right end. The straightened wire (1) is placed on the bending units (6). The bending units (6) consist of a fixed pin (2), which is located along the bending mechanism's rotation axis and of a rotating pin (3), able to rotate about the fixed pin. The two pins (2) and (3) are placed on a flat disc (4). The bending pins alone or with their mechanisms can be withdrawn from the bending plane, where the material to be bent is placed, so that the material to be bent is no more entrapped between the pair of pins (2) and (3).
The material to be bent (1) is held by a gripper (5), which is located at the interior side of the bending mechanism. The grippers (5) can move transversely to the longitudinal axis of the material (1). The process for production of the piece of figure 2 is the following :
The straightened material (1) is placed, as in figure 3a, between the pins (2) and (3) of the two bending units, which are located at distances xl and yl from the left and the right end respectively.
Upon rotation of the rotating pins (3) about fixed pins (2), as in figure 3b, the bending units bend the material at angles αl and βl respectively, while the grippers (5) restrain the material. Next, the rotating pins (3) return to their initial location, as in figure 3c.
The bending units and the grippers move towards the inner section of the semifinished product, at x2 for the left one and at x2 for the right one, as in figure 3d. Next, the bending pins (2) and (3) and the discs (4) or alternatively, the bending pins (2) and (3) only, are withdrawn under the bending plane, as in figure 3e, so that the material to bent is freed. The elements under the plane of bending are drawn with a broken line. frame (6) executes motion Zl, driven by a motor (13), which drives it via a rack (12) and pinion assembly.
The machine is presented schematically in figure 5. It consists of two bending mechanisms, which are placed on two moving frames (6a) and (6b) for the left and right carriers, which are placed on the metal structure (7) and can move along guides.
Its operation is as following: The moving frames are relocated at the appropriate locations for performing the first bending operation at the left and right ends.
The material to be bent (1) is placed manually or automatically on the bending mechanisms. Next, both the two bending mechanisms perform bending. The bending mechanisms return to their initial position and the process of the successive bending operations follows, as presented in the explanation of the present method.
In case bending towards the opposite direction is required, the process which is followed is the one explained previously, during the presentation of the method.
As already mentioned during the presentation of the method, bending can be implemented in two ways. They can be successive, with one mechanism restraining and bending, while the other mechanism is moving towards the next bending location. A gripper at the interior section can be activated, in order to restrain the material to be bent, while the two bending mechanisms bend simultaneously and move simultaneously towards another location. In this case, the gripper can move transversely to the axis of the material, just like the grippers on the bending mechanisms.
Existence of only one fixed and one rotating pin on each bending mechanism is a definite advantage of the present method, since the bending mechanism dimensions are kept reasonable, and the two bending mechanisms can move very close to each another, so that they can bend sides of a short length as well. Furthermore, due to the capability for bending at both directions, the machine can produce whatever shape is required.

Claims

1. A method for bending of wire rods, wires, tubes or any other material of prismatic cross section, which is characterized by a bending mechanism, which consists of a fixed (centered) pin (2), of a rotating pin (3) for the bending of material (1) about the fixed pin (2), and of a gripper (5), which constrains the material to be bent, where the pins are able to withdraw under the plane of bending, so that the gripper can transport the material to be bent to the opposite side of the fixed pin, and where the pair of pins can return on the plane of bending, in order to bend the material towards the opposite direction.
2. A method according to Claim 1, which is characterized by the transportation of the semi-finished product to the opposite side of the fixed pin (2), while the bending mechanism consisting of the fixed (2) and the rotating pins (3) has withdrawn under the plane of bending.
3. A method according to Claim 1, which is characterized by the transfer of the semi-finished product on the plane of bending and to the opposite side of the fixed pin (2), while the bending pins (2) and (3) have withdrawn under the plane of bending.
4. A method according to Claims 1, 2 and 3, which is characterized by two bending mechanisms, which can move from the ends of the material to be processed towards a location at the interior section of the material, and perform the predefined bending operations at the appropriate distances.
5. A machine for bending of wire rods, wires, tubes or other material of prismatic cross section, which consists of two moving frames (6a), (6b), which can slide along guides, driven by independent motors, where each moving frame supports a bending mechanism, which consists of one fixed (centered) pin (2), one rotating pin (3), where the rotation of pin (3) causes bending of the material to be bent (1), and of one gripper (5) for restraining the wire (1) to bent, where the moving frames move from the material ends towards the inner section and bend the material (1) according to predefined operations, and where the machine is characterized by the potential for bending at the opposite direction, where the grippers (5), located on the two moving frames (6a), (6b), restrain the material (1), the bending mechanisms or alternatively the fixed pins (2) and the rotating (bending) pins (3) are withdrawn under the plane of bending, the grippers (5) transfer the material (1) to the opposite sides of the fixed pins (2), while simultaneously the bending pins (3) rotate at 180°, while being under the plane of bending, the bending mechanisms or the fixed and the rotating pins return on the plane of bending, where they restrain the material to be bent and they bent it towards the opposite direction.
6. A machine according to Claim 5, which is characterized by two bending mechanisms, (6a), (6b), which can move from the ends towards the centre in an alternating manner, i.e. where one bender performs bending operation while the material is restrained by the moving frame's gripper, while at the same time the other moving frame is transferred to the location of the next bending operation until the process is concluded.
EP03710055A 2002-04-02 2003-02-20 Method and machine for bending of wire rods, wires, tubes or other material of prismatic cross section Expired - Lifetime EP1494825B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GR2002100165 2002-04-02
GR20020100165A GR1004238B (en) 2002-04-02 2002-04-02 Method and machine for bending concrete beams, wires, tubes or other material of a prismatic cross section
PCT/GR2003/000008 WO2003082492A1 (en) 2002-04-02 2003-02-20 Method and machine for bending of wire rods, wires, tubes or other material of prismatic cross section

Publications (2)

Publication Number Publication Date
EP1494825A1 true EP1494825A1 (en) 2005-01-12
EP1494825B1 EP1494825B1 (en) 2012-06-06

Family

ID=28460308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03710055A Expired - Lifetime EP1494825B1 (en) 2002-04-02 2003-02-20 Method and machine for bending of wire rods, wires, tubes or other material of prismatic cross section

Country Status (4)

Country Link
EP (1) EP1494825B1 (en)
AU (1) AU2003214481A1 (en)
GR (1) GR1004238B (en)
WO (1) WO2003082492A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106794502A (en) * 2014-06-06 2017-05-31 Mep意大利美普机械制造有限公司 Perfect bending machine and correlation method

Families Citing this family (4)

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GR1004760B (en) * 2003-11-26 2004-12-16 "���������������������������������-������������������������������"�����.�.�"���������.�."�� Four-direction concrete iron rod-bending mechanism capable of cutting the front and rear extremity of same rod
GR1005272B (en) 2005-11-15 2006-09-12 Method and system for bending wires, concrete bars and materials of prismatic cross section
GR1005944B (en) * 2007-02-05 2008-06-19 Γαλανος Αε Cutting and bending of iron bars via moving heads and rectilinear bar-retaining guides displaceable by parts.
IT1396456B1 (en) * 2009-11-24 2012-11-23 Piegatrici Macch Elettr EQUIPMENT FOR BENDING OBLUNG METAL PRODUCTS, SUCH AS BARS, ROUNDS, OR METAL WIRES, AND RELATIVE BENDING PROCEDURE

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IT1024224B (en) * 1974-11-15 1978-06-20 Del Fabbro Remigio MAOCHINA CONTINUOUS SUPPLY SUPPLY BRACKET WITH MATERIAL RECOVERY AND RELEVANT ME TODO OF OBERARE FOR THE QUSTRUTION OF THE SAID BRACKETS
CH652947A5 (en) * 1981-11-18 1985-12-13 O E M B S A WIRE BENDING MACHINE.
IT1235177B (en) * 1989-01-18 1992-06-23 Piegatrici Macch Elettr DOWNSTREAM DRIVER GROUP FOLDER GROUP AND TAIL BENDING PROCEDURE.
IT1236462B (en) * 1989-12-29 1993-03-09 Fabro Giorgio Del SATELLITE BENDING GROUP
DE4443518A1 (en) * 1994-12-07 1996-06-13 Peddinghaus Carl Ullrich Dr Process for bending steel bars, in particular for bending reinforcing steel bars to reinforcement bars
US5927132A (en) * 1998-04-30 1999-07-27 Schnell Spa Method of bending bars

Non-Patent Citations (1)

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Title
See references of WO03082492A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106794502A (en) * 2014-06-06 2017-05-31 Mep意大利美普机械制造有限公司 Perfect bending machine and correlation method

Also Published As

Publication number Publication date
GR1004238B (en) 2003-05-14
EP1494825B1 (en) 2012-06-06
WO2003082492A1 (en) 2003-10-09
AU2003214481A1 (en) 2003-10-13

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