EP1230996A2 - Machine de cintrage à froid, travaillante par tirage controlé des profilés allongés - Google Patents

Machine de cintrage à froid, travaillante par tirage controlé des profilés allongés Download PDF

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Publication number
EP1230996A2
EP1230996A2 EP02002143A EP02002143A EP1230996A2 EP 1230996 A2 EP1230996 A2 EP 1230996A2 EP 02002143 A EP02002143 A EP 02002143A EP 02002143 A EP02002143 A EP 02002143A EP 1230996 A2 EP1230996 A2 EP 1230996A2
Authority
EP
European Patent Office
Prior art keywords
machine
fact
cold bending
spatial dimensions
elongated profiles
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Withdrawn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
EP02002143A
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German (de)
English (en)
Other versions
EP1230996A3 (fr
Inventor
Placidi Filippo Ing.
Marino Pietro Ing.
Monaco Cosimo Ing.
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.)
Silmet SpA
Original Assignee
Silmet SpA
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 Silmet SpA filed Critical Silmet SpA
Publication of EP1230996A2 publication Critical patent/EP1230996A2/fr
Publication of EP1230996A3 publication Critical patent/EP1230996A3/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Withdrawn legal-status Critical Current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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/12—Bending rods, profiles, or tubes with programme control

Definitions

  • this invention concerns a machine for the cold bending operation, employing controlled drawing on the three spatial dimensions, of elongated metallic or composite profiles, such as the profiles used in the automobile industry.
  • Machine tools for the movement of bending equipments for elongated profiles are well known, such as the one described in WO9319864. These machines operate exclusively on two dimensions and can therefore execute bending operations on one geometric plane only. For products having geometry outside the plane, it is necessary to mount specific fixtures on the machine, to enable the tools to make the necessary driving movements. Each of these products, therefore, requires the construction of special complex fixtures, each of them can be used for no more than one product. In these fixtures, individual movements are not made independently of each other, because the prior art does not provide for an independent or autonomous motor drive for each degree of freedom of the machine.
  • One objective of the present invention is obtaining a machine that performs cold bending operations through the controlled drawing of elongated profiles on three dimensions, wherein the tooling fixtures to be used for each product are reduced in complexity, by transferring the driving movements to the machine once and for all, so allowing said driving movements to be used for products with various configurations, leaving to the tooling fixtures the unique function of gripping and holding the product to be worked.
  • a second objective of the present invention is complete managing bending operations of materials in the same lot of production, or in different lots, having mechanical characteristics that respond to acceptance specifications, but which are otherwise different from each other, and therefore they are characterised by different springback values.
  • a third objective of the present invention is implementing a new equipment that acts mainly on numerical values of parameters defining driving movements, instead on the physical parts of the machine.
  • a final objective of the present invention is limiting the machine resetting and zero adjusting operations, prior to lot production, only to positioning of the gripping and holding fixtures on the machine.
  • the machine is equipped with sensors that detect the forces in action and the relevant torques.
  • the working cycle of the machine is defined by five diagrams, each describing one of the five degrees of freedom versus the elapsed time. Each one of the five diagrams is determined by the geometry of the product that has to be obtained. The values of each of the five quantities are computer controlled by a specific software program.
  • This program is capable of adjusting the values of the five measured quantities to the different mechanical characteristics of the profiles.
  • the above-mentioned computer program makes the machine instantly adjust to need, so that profiles having different mechanical characteristics are made in order to respect specified tolerances.
  • the adjustment of the machine action is made by measurement of the torque and force values, carried out by the above-mentioned sensors.
  • Figure 1 is a view of the entire machine and control panel.
  • the five arrows show the five degrees of freedom of the machine.
  • Figure 2 illustrates the machine in a different position, indicating the sensors detecting forces and torques, and a transmission drive.
  • the machine is made up of two mechanical units, A and B, mounted on a supporting bench S and of a control unit C.
  • Units A and B perform driving movements effecting the three-dimensional bending, accordingly by operating on the variation of the five degrees of freedom.
  • XYZ is a reference system of fixed orthogonal cartesian coordinates, where Y is parallel to the horizontal longitudinal axis of the bench and Z is a vertical axis.
  • Each of the units A and B is made up of a box (L), which contains the transmission drives for rotation around the vertical axis.
  • a small turret (T) is mounted on this box.
  • the turret is made up of two parts, T 1 and T 2 , which are connected through a hinge movement R , resting on a cradle. This cradle is operated by a ball bearing screw that ,in turn, is driven by motorized belt.
  • a characteristic feature of this invention is in that the values of the five parameters y A , ⁇ A , ⁇ A , ⁇ B , ⁇ B , at the beginning of the working cycle, may be assigned arbitrarily, albeit they must be chosen inside the respective range of variation. At the beginning of the working cycle, this allows:
  • the prior art provides the possibility of performing translation and rotation movements only on the horizontal plane.
  • the prior art requires specific equipments and driving movements specifically designed for each of such products. This special equipments cannot, therefore, be re-configured or reset for each of different products.
  • products with different geometric configurations can be produced by the same machine, by mounting on the machine the relevant tooling equipments, that are made up of only the parts that have to come in direct contact with the profile to be bent(that is pliers, profile gripping and holding devices), while the bending movements are performed by the machine with an appropriate choice of the five bending parameters, or degrees of freedom, as described here above.
  • the machine is equipped with force and torque sensors (nf1, nf2, ....nf5), which instantly communicate the values to the central unit.
  • the central unit completely manages the machine through a specific software program. Once the above data has been inserted for each value of the finite parameter t i , as described, the control unit carries out the driving movements, corresponding to the 5 x n input values .
  • the set of values is subject to modification according to the characteristics of the material being worked and to the data supplied by the sensors: thus, it is possible to compensate for different material springback, depending on the mechanical characteristics of the profile to be bent.
  • the tooling stage deals with applying the tool fixtures on the tool tables only, while the resetting, or zero adjusting stage, is carried out solely by the machine by its processing software.
  • the objectives of the present invention may be reached by a choice of a different number of bending degrees of freedom, for the machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
EP02002143A 2001-02-05 2002-01-29 Machine de cintrage à froid, travaillante par tirage controlé des profilés allongés Withdrawn EP1230996A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVI20010031 ITVI20010031A1 (it) 2001-02-05 2001-02-05 Macchina per la curvatura a freddo mediante stiramento controllato diprofili allungati
ITVI010031 2001-02-05

Publications (2)

Publication Number Publication Date
EP1230996A2 true EP1230996A2 (fr) 2002-08-14
EP1230996A3 EP1230996A3 (fr) 2004-01-14

Family

ID=11461524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02002143A Withdrawn EP1230996A3 (fr) 2001-02-05 2002-01-29 Machine de cintrage à froid, travaillante par tirage controlé des profilés allongés

Country Status (2)

Country Link
EP (1) EP1230996A3 (fr)
IT (1) ITVI20010031A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2882947A1 (fr) * 2005-03-14 2006-09-15 Lexovienne De Mecanique Et Out Machine de cintrage avec etirage
CN102139300A (zh) * 2010-12-24 2011-08-03 电子科技大学 多轴弯管装备智能控制系统
CN103157724A (zh) * 2013-02-27 2013-06-19 中航飞机股份有限公司西安飞机分公司 一种单曲度圆弧型材的通用拉弯模具
CN104808637A (zh) * 2013-08-05 2015-07-29 潍坊华孚机械科技有限公司 一种冷弯成型生产线

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3620151A1 (de) * 1985-06-19 1987-02-26 Asea Ab Verfahren und robotereinrichtung zum biegen von stangenfoermigen materialien oder werkstuecken
DE3618701A1 (de) * 1986-06-04 1987-12-10 Spaeth Gmbh & Co Kg Stahlbau B Verfahren und vorrichtung zum kaltumformen von profilen aus eisen- und nichteisenmetallen
US5050089A (en) * 1989-09-08 1991-09-17 Regents Of The University Of Minnesota Closed-loop control system
EP0934783A2 (fr) * 1998-02-03 1999-08-11 Kabushiki Kaisha Opton Dispositif et méthode de cintrage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3620151A1 (de) * 1985-06-19 1987-02-26 Asea Ab Verfahren und robotereinrichtung zum biegen von stangenfoermigen materialien oder werkstuecken
DE3618701A1 (de) * 1986-06-04 1987-12-10 Spaeth Gmbh & Co Kg Stahlbau B Verfahren und vorrichtung zum kaltumformen von profilen aus eisen- und nichteisenmetallen
US5050089A (en) * 1989-09-08 1991-09-17 Regents Of The University Of Minnesota Closed-loop control system
EP0934783A2 (fr) * 1998-02-03 1999-08-11 Kabushiki Kaisha Opton Dispositif et méthode de cintrage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2882947A1 (fr) * 2005-03-14 2006-09-15 Lexovienne De Mecanique Et Out Machine de cintrage avec etirage
EP1702691A1 (fr) * 2005-03-14 2006-09-20 Lexovienne de Mécanique et Outillage (LMO) Machine de cintrage avec etirage
CN102139300A (zh) * 2010-12-24 2011-08-03 电子科技大学 多轴弯管装备智能控制系统
CN103157724A (zh) * 2013-02-27 2013-06-19 中航飞机股份有限公司西安飞机分公司 一种单曲度圆弧型材的通用拉弯模具
CN104808637A (zh) * 2013-08-05 2015-07-29 潍坊华孚机械科技有限公司 一种冷弯成型生产线
CN104808637B (zh) * 2013-08-05 2017-11-10 潍坊华孚机械科技有限公司 一种冷弯成型生产线

Also Published As

Publication number Publication date
ITVI20010031A1 (it) 2002-08-05
EP1230996A3 (fr) 2004-01-14

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