EP1449598A1 - Supplementary tool-holding table for compensating the flexure of the upper or lower table of a bending press - Google Patents

Supplementary tool-holding table for compensating the flexure of the upper or lower table of a bending press Download PDF

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Publication number
EP1449598A1
EP1449598A1 EP04003238A EP04003238A EP1449598A1 EP 1449598 A1 EP1449598 A1 EP 1449598A1 EP 04003238 A EP04003238 A EP 04003238A EP 04003238 A EP04003238 A EP 04003238A EP 1449598 A1 EP1449598 A1 EP 1449598A1
Authority
EP
European Patent Office
Prior art keywords
bars
bearing base
bending
press
table according
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Withdrawn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
EP04003238A
Other languages
German (de)
English (en)
French (fr)
Inventor
Antonio Manini
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.)
Schiavi Macchine Industriali SpA
Original Assignee
FIM 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 FIM SpA filed Critical FIM SpA
Publication of EP1449598A1 publication Critical patent/EP1449598A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
    • 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
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0272—Deflection compensating means

Definitions

  • Object of the present invention is a supplementary tool-holding table for compensating the flexure of the lower or upper table of a bending press.
  • the structure of a bending press is composed of an upper table carrying a punch and a lower table carrying the matrix die, lower table and upper table being connected by two side shoulders.
  • the deforming effect of the two tables that is greater in their centres and is cancelled when reaction points or pushing points of hydraulic actuators are reached, is causing the penetration of the punch into the matrix die not to be constant along the bending line, and this generates an angular bending; more precisely, the sheet has a bending angle that is lower on its sides and more open in its centre.
  • Object of the present invention is solving the above-stated inconveniences realising a supplementary table that joins an adaptive mechanical system with a system that is able to be adjusted depending on the thrust of actuators of a known type and therefore depending on the necessary force for the bending.
  • a supplementary table for compensating the flexure of the upper and/or lower table of a bending press object of the present invention, that is characterised by what is stated in the below-listed claims, and in particular in that it provides a bearing base of the upper or lower table in which two cylindrical bars are inserted, on which a force transmitting sheet abuts, onto such sheet a cylindrical bar presses that is inserted in a bearing base for matrix die or punch tool.
  • reference 1 designates a bearing base adapted to be housed over the lower table of a bending press.
  • the diameter of the two bars 3 is slightly greater than the groove 2 depth.
  • an abutment sheet 4 is rested in which a central bar 6 bears that is held by a tool-bearing base (matrix die) 5.
  • the tool bearing base is mobile.
  • the two bars 3 can be approached in the central part of the lower table next to the maximum flexure points.
  • means are provided that, in the example shown, are composed of dowels 7 that, by reacting against the two shoulders of the bearing base, push said two bars 3 towards the centre.
  • Said dowels 7 are mostly concentrated in the central area where the two bars 3 must be as near as possible one to the other.
  • the supplementary table therefore operates as follows.
  • the central bar 6 transmits the force to the abutment sheet that is flexed proportionally to the distance of the two reaction bars 3.
  • the sheet flexure makes the external parts of the mobile part approach the bearing base more, while centrally the mobile part is not flexed very much due to the maximum approach of the two bars 3.
  • the means for adjusting the distance between the two bars 3 can be different from the described ones, for example small hydraulic cylinders, provided that they allow adapting the lower and/or upper table flexures to possible geometry variations of the work-piece to be worked.
  • the longitudinal groove 2 in which the bars 3 are inserted can be directly obtained by milling in the upper and/or lower table.
  • the bars 3, as well as the central bar, could also have a different section from the circular one, for example they could have a square section but with joined edges that contact the abutment sheet 4 in order not to impair its flexure.
  • the two bars 3 can be housed, with a certain clearance, into two different and separate channels converging towards the central part.
  • the actuators can be placed in a more central position or a single, centrally-placed actuator can be provided.
  • reaction bar displacements must be differently configured from the above-described ones and in particular their ends must also be approached.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP04003238A 2003-02-18 2004-02-13 Supplementary tool-holding table for compensating the flexure of the upper or lower table of a bending press Withdrawn EP1449598A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPR20030012 ITPR20030012A1 (it) 2003-02-18 2003-02-18 Tavola supplementare porta utensile per compensare
ITPR20030012 2003-02-18

Publications (1)

Publication Number Publication Date
EP1449598A1 true EP1449598A1 (en) 2004-08-25

Family

ID=32732614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04003238A Withdrawn EP1449598A1 (en) 2003-02-18 2004-02-13 Supplementary tool-holding table for compensating the flexure of the upper or lower table of a bending press

Country Status (2)

Country Link
EP (1) EP1449598A1 (it)
IT (1) ITPR20030012A1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107116113A (zh) * 2017-06-18 2017-09-01 柴德维 一种工件折弯用压力机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE725311C (de) * 1937-11-17 1942-09-18 Sonntag G M B H R Blechbiegepresse
DE1085487B (de) * 1956-02-13 1960-07-21 Eugen Siempelkamp Blechbiegepresse
US4586361A (en) * 1984-08-24 1986-05-06 Niagara Machine & Tool Works Press brake deflection compensation structure
US4589836A (en) * 1982-03-22 1986-05-20 Fjellman Press Ab Hydraulic press
US4640113A (en) * 1984-02-03 1987-02-03 Beyeler Machines, S.A. Sheet-bending press incorporating a device for continuous monitoring of the bending angle
JP2002001435A (ja) * 2000-06-23 2002-01-08 Tiger Kosan:Kk 回転抑制機能付金属板折曲装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE725311C (de) * 1937-11-17 1942-09-18 Sonntag G M B H R Blechbiegepresse
DE1085487B (de) * 1956-02-13 1960-07-21 Eugen Siempelkamp Blechbiegepresse
US4589836A (en) * 1982-03-22 1986-05-20 Fjellman Press Ab Hydraulic press
US4640113A (en) * 1984-02-03 1987-02-03 Beyeler Machines, S.A. Sheet-bending press incorporating a device for continuous monitoring of the bending angle
US4586361A (en) * 1984-08-24 1986-05-06 Niagara Machine & Tool Works Press brake deflection compensation structure
JP2002001435A (ja) * 2000-06-23 2002-01-08 Tiger Kosan:Kk 回転抑制機能付金属板折曲装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 05 3 May 2002 (2002-05-03) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107116113A (zh) * 2017-06-18 2017-09-01 柴德维 一种工件折弯用压力机

Also Published As

Publication number Publication date
ITPR20030012A1 (it) 2004-08-19

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