EP0063041A2 - Verfahren und Vorrichtung zum stufenweisen Biegen - Google Patents

Verfahren und Vorrichtung zum stufenweisen Biegen Download PDF

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Publication number
EP0063041A2
EP0063041A2 EP82301877A EP82301877A EP0063041A2 EP 0063041 A2 EP0063041 A2 EP 0063041A2 EP 82301877 A EP82301877 A EP 82301877A EP 82301877 A EP82301877 A EP 82301877A EP 0063041 A2 EP0063041 A2 EP 0063041A2
Authority
EP
European Patent Office
Prior art keywords
sheet material
heads
incremental
jaws
movement
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Withdrawn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
EP82301877A
Other languages
English (en)
French (fr)
Other versions
EP0063041A3 (de
Inventor
John Walker
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.)
PA Consulting Services Ltd
Original Assignee
PA Consulting Services Ltd
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 PA Consulting Services Ltd filed Critical PA Consulting Services Ltd
Publication of EP0063041A2 publication Critical patent/EP0063041A2/de
Publication of EP0063041A3 publication Critical patent/EP0063041A3/de
Withdrawn legal-status Critical Current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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • B21D5/042—With a rotational movement of the bending blade

Definitions

  • This invention relates to bending and particularly but not exclusively to bending metal sheet materials. Background to the invention
  • a machine for bending an elongate article such as a brake pipe
  • the machine includes a bend head such as for example a die and former arrangement operable to put a controlled angular extent of bend into a short length of the article and means operable in sequence with operation of the die and former arrangement for advancing the article through the die and former arrangement by a controlled amount to present a further length for bending.
  • a method of forming a bend in sheet material comprises the steps of incrementally advancing the sheet material between two jaws, effecting relative movement between the two jaws between each said incremental movement so as to introduce a radius of curvature in the sheet material between each said incremental movement.
  • both of the jaws are moveable but only one jaw is normally moved relative to the other so as to effect bending in either one direction or the other.
  • simulataneous movement of both jaws is effected so as to multiply the bending effect.
  • Preferably means is provided for incrementally advancing the sheet through the jaws between each said movement of one of the jaws relative to the other so that another region of the sheet material can be subjected to bending.
  • Preferably means is provided for adjusting the distance through which the sheet material is moved during the said incremental advance.
  • Each of the jaws conveniently presents a curved surface to the other jaw, the two curved surfaces diverging the one from the other in the direction in which sheet material will move through the jaws.
  • a preferred bend per bending operation is one which introduces a radius of curvature in the sheet material which lies in the range 2 - 4 times the thickness of the material preferably in the range 2.5 to 3 times the thickness of the material.
  • the sheet material is fed between a first pair of fixed jaws which have generally triangular cross-sections and define between opposed faces a parallel channel through which the sheet material will slip whilst their external surfaces define two converging surfaces which serve as guides for two slideable jaws one or both of which can be moved in a generally forward direction to engage the surface of the protruding sheet material and bend the latter around the other protruding jaw which itself may be held stationary or be moved as required.
  • the jaws or heads may be movable in an aligned direction which may be substantially perpendicular to the direction of incremental advance of the sheet material.
  • the heads may be mechanically interconnected so as to be movable together, or they may be moved independently under separate control. In either case, one head engages the sheet material to introduce a bend in one direction, and the other head engages the sheet material to introduce a bend in the other direction.
  • a bend of a desired profile can be introduced in the sheet material.
  • the bend can be of any desired radius (within the physical limitations imposed by the machine) and can include a reverse or re-entrant bend.
  • a pair of jaws or blades 10 and 12 are arranged with a small adjustable clearance between them designated 13.
  • Sheet material 14 is fed in the direction of the arrow 15 by a feeding device (not shown).
  • the blades are pivoted around axis 17 and 18 and are curved so that each jaw or blade has a radius of curvature struck from the opposite blades pivot axis as a centre. In this way the curved surface of the jaw 10 is formed so as to be a constant radial distance from the axis 17 and the curved surface of the jaw 12 will always be in a constant radial distance from the axis 18.
  • the two hydraulic actuators 19 and 20 are provided for moving the jaws 10 and 12 and are connected to the jaws in such a way as to convert the linear translational movement of the actuators into the arcuate movement of the jaws.
  • the sheet material 14 can be incrementally advanced again through the jaws and if the actuator 19 is once again operated, the jaw 10 will once again be moved in a forward direction over the jaw 12 and introduce a further bend in the same direction as the first bend in the sheet material 14.
  • any desired radius of curvature can be produced from a minimum radius which is a function of the radius of curvature of the jaws themselves.
  • the lower jaw 12 can itself be operated by its own actuator 20 so as to produce bending in the opposite sense to that introduced by movement of the jaw 10.
  • a combination of operations of incremental advance and jaw movement can produce products consisting of sheet material manipulated to various radii in various senses. It will be appreciated that fully sinuous profiles can be produced as well as those consisting of straight sections separated by curved sections.
  • the invention will normally have jaws which are straight in the direction which is transverse to the feed direction of the sheet material, it is possible that the blades are adapted to maintain a clearance between them and to accept sheet stock material already rolled into say corrugated form.
  • the means for feeding the sheet material By arranging that the means for feeding the sheet material, incrementally advances one lateral edge of the material by a greater distance than the other edge is advanced then, in association with regular bending of the advanced material, so a generally conical form will be produced. If the bending is first in one sense and then the other, the conical form so produced will have a corrugated profile.
  • Fig.3 it will be seen that if a sufficiently small radius of curvature is introduced and if a sufficiently small incremental advance is permitted between each bending movement, no arcuate movement of the jaws need be provided for and the latter may move in a pure linear translation mode.
  • two fixed jaws 21 and 22 provide a guide through which sheet material 23 will pass and inclined external surfaces 24 and 25 of the fixed jaws 21 and 22 provide guides over which the flat surfaces 26 and 27 of jaws 28 and 29 respectively can slide.
  • the forward ends of the jaws 28 and 29 are curved at 30 and 31 respectively and movement of one jaw such as 28 over the other jaw such as 29 will produce a bending of the sheet material in the direction shown in the drawing. Movement of the other jaw 29 relatively to the jaw 28 will introduce a bend in the opposite direction
  • the minimum radius of curvature will be determined by the radius of the curved sections 30 and 31 of the jaws 28 and 29.
  • the jaws 28 and 29 may be accurately guided so that there is no possibility of lateral movement in the direction of the arrows 32 and 33 respectively or alternatively a yielding or actual lateral movement in these directions may be provided for so that simultaneous advance of the jaws 28 and 29 can be used to effect linear advance of the sheet material 23.
  • Fig.4 shows a further embodiment of apparatus for bending sheet materials such as steel.
  • the sheet material to be bent is fed in the direction of arrow C between two rollers 40 and 42 which are biased towards one another (to provide a 'pinch') by a spring 43.
  • the roller 42 is rotatably driven, through a one-way clutch, by a lobe-shaped arm 43.
  • One end 44 of the arm 43 is rounded and is engaged by a member 45 attached to the end of a piston 46 of a hydraulic ram 47.
  • the ram 47 is energised so as to cause the roller 42 to undergo indexing movements which incrementally advance the sheet material in the direction of arrow C, the one-way clutch preventing reverse movement of the sheet material.
  • a helical tension spring 48 acting between the cylinder of the ram 47 and the end 44 of the arm 43 acts to maintain the member 45 in contact with the end 44 of the arm 43.
  • rollers 40 and 42 not only cause incremental advance of the sheet material in the direction of arrow C, but also act to clamp the sheet material between such indexing movements.
  • Each head 55 or 56 has a shaped nose for engaging and bending the sheet material as the latter is indexed in the directioncf arrow C.
  • the radius of curvature applied to the sheet material is dependent on the stroke of the heads 55 and 56 and the incremental advance of the sheet material.
  • the direction of curvature of the bend applied to the sheet material is dependent on which of the heads 55 and 56 engages the sheet material. In the position illustrated in Fig.4 the heads 55 and 56 are in their lowermost extreme position which corresponds to a bend of 90 0 being applied to the sheet material. Normally, the stroke of the heads applies a bend of smaller angular extent between each of a number of incremental advancing movements of the sheet material.
  • Rotation of the arm 43' in the operative direction is limited by a stop 60 which is adjustable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP82301877A 1981-04-13 1982-04-08 Verfahren und Vorrichtung zum stufenweisen Biegen Withdrawn EP0063041A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8111487 1981-04-13
GB8111487 1981-04-13

Publications (2)

Publication Number Publication Date
EP0063041A2 true EP0063041A2 (de) 1982-10-20
EP0063041A3 EP0063041A3 (de) 1984-01-11

Family

ID=10521111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82301877A Withdrawn EP0063041A3 (de) 1981-04-13 1982-04-08 Verfahren und Vorrichtung zum stufenweisen Biegen

Country Status (2)

Country Link
EP (1) EP0063041A3 (de)
GB (1) GB2096501A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985000766A1 (en) * 1983-08-02 1985-02-28 Joseph Rhodes Limited Improvements in bending machines
FR2580961A1 (fr) * 1985-04-25 1986-10-31 Dev Thermique Ste Fse Dispositif de pliage d'elements en feuille, en particulier de toles metalliques prelaquees
EP0316703A2 (de) * 1987-11-19 1989-05-24 Feintool International Holding Verfahren und Vorrichtung zum Biegen von Werkstücken
WO2003024171A2 (en) * 2001-09-12 2003-03-20 Ppg Industries Ohio, Inc. Method of treating photoresists using electrodeless uv lamps
WO2009078739A3 (en) * 2007-12-18 2009-10-22 Scott Technology Limited Metal folding apparatus

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2033667A (en) * 1933-04-03 1936-03-10 Midland Steel Prod Co Apparatus for forming elongated corrugated poles
FR801844A (fr) * 1935-11-07 1936-08-19 Hugh Smith & Company Possil Lt Procédé et machine hydraulique pour le cintrage de tôles de quille de navires
DE658766C (de) * 1934-03-29 1938-04-14 Siemens Schuckertwerke Akt Ges Vorrichtung zum Herstellen von Wellblechen
US2734552A (en) * 1956-02-14 yonash
US3398589A (en) * 1967-05-25 1968-08-27 Us Industries Inc Rack and pinion feeding apparatus
FR2160702A1 (de) * 1971-11-22 1973-07-06 Wendel Sidelor
FR2331392A1 (fr) * 1975-11-13 1977-06-10 Charenton Sa Chaudronnerie Dispositif pour le cambrage des toles a froid
US4043165A (en) * 1976-09-15 1977-08-23 The Boeing Company Three-point, air-bending sheet metal bender
DE2630896A1 (de) * 1976-07-09 1978-01-12 Balcke Duerr Ag Vorrichtung zum abbiegen grossflaechiger bauteile
DE2641573A1 (de) * 1976-09-13 1978-03-23 Mannesmann Ag Druckpresse zum biegen des randstreifens eines ebenen bleches
GB2004216A (en) * 1977-09-19 1979-03-28 Salvagnini Transferica Spa Machine for bending the edges of rectangular sheets of metal

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734552A (en) * 1956-02-14 yonash
US2033667A (en) * 1933-04-03 1936-03-10 Midland Steel Prod Co Apparatus for forming elongated corrugated poles
DE658766C (de) * 1934-03-29 1938-04-14 Siemens Schuckertwerke Akt Ges Vorrichtung zum Herstellen von Wellblechen
FR801844A (fr) * 1935-11-07 1936-08-19 Hugh Smith & Company Possil Lt Procédé et machine hydraulique pour le cintrage de tôles de quille de navires
US3398589A (en) * 1967-05-25 1968-08-27 Us Industries Inc Rack and pinion feeding apparatus
FR2160702A1 (de) * 1971-11-22 1973-07-06 Wendel Sidelor
FR2331392A1 (fr) * 1975-11-13 1977-06-10 Charenton Sa Chaudronnerie Dispositif pour le cambrage des toles a froid
DE2630896A1 (de) * 1976-07-09 1978-01-12 Balcke Duerr Ag Vorrichtung zum abbiegen grossflaechiger bauteile
DE2641573A1 (de) * 1976-09-13 1978-03-23 Mannesmann Ag Druckpresse zum biegen des randstreifens eines ebenen bleches
US4043165A (en) * 1976-09-15 1977-08-23 The Boeing Company Three-point, air-bending sheet metal bender
GB2004216A (en) * 1977-09-19 1979-03-28 Salvagnini Transferica Spa Machine for bending the edges of rectangular sheets of metal

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985000766A1 (en) * 1983-08-02 1985-02-28 Joseph Rhodes Limited Improvements in bending machines
GB2154165A (en) * 1983-08-02 1985-09-04 Rhodes Joseph Ltd Improvements in bending machines
US4658624A (en) * 1983-08-02 1987-04-21 Joseph Rhodes Limited Bending Machines
FR2580961A1 (fr) * 1985-04-25 1986-10-31 Dev Thermique Ste Fse Dispositif de pliage d'elements en feuille, en particulier de toles metalliques prelaquees
EP0316703A2 (de) * 1987-11-19 1989-05-24 Feintool International Holding Verfahren und Vorrichtung zum Biegen von Werkstücken
EP0316703A3 (de) * 1987-11-19 1990-07-11 Feintool International Holding Verfahren und Vorrichtung zum Biegen von Werkstücken
WO2003024171A2 (en) * 2001-09-12 2003-03-20 Ppg Industries Ohio, Inc. Method of treating photoresists using electrodeless uv lamps
WO2003024171A3 (en) * 2001-09-12 2003-08-28 Ppg Ind Ohio Inc Method of treating photoresists using electrodeless uv lamps
WO2009078739A3 (en) * 2007-12-18 2009-10-22 Scott Technology Limited Metal folding apparatus

Also Published As

Publication number Publication date
GB2096501A (en) 1982-10-20
EP0063041A3 (de) 1984-01-11

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Owner name: P.A. CONSULTING SERVICES LIMITED

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Effective date: 19840912

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Inventor name: WALKER, JOHN