EP0941833A1 - Dispositif pour le contrÔle de la pression de course dans une presse de formage - Google Patents

Dispositif pour le contrÔle de la pression de course dans une presse de formage Download PDF

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Publication number
EP0941833A1
EP0941833A1 EP98104092A EP98104092A EP0941833A1 EP 0941833 A1 EP0941833 A1 EP 0941833A1 EP 98104092 A EP98104092 A EP 98104092A EP 98104092 A EP98104092 A EP 98104092A EP 0941833 A1 EP0941833 A1 EP 0941833A1
Authority
EP
European Patent Office
Prior art keywords
press
uprights
crown
die shoe
members
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Withdrawn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
EP98104092A
Other languages
German (de)
English (en)
Inventor
Renato Guarino
Gennaro Del Gaudio
Giulio Picone
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.)
Battaglia Bergomi Claudia
Original Assignee
Battaglia Bergomi Claudia
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 Battaglia Bergomi Claudia filed Critical Battaglia Bergomi Claudia
Priority to EP98104092A priority Critical patent/EP0941833A1/fr
Publication of EP0941833A1 publication Critical patent/EP0941833A1/fr
Withdrawn legal-status Critical Current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
    • B30B15/0029—Details of, or accessories for, presses; Auxiliary measures in connection with pressing means for adjusting the space between the press slide and the press table, i.e. the shut height
    • B30B15/0041—Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/04—Frames; Guides
    • B30B15/045—Mountings of press columns

Definitions

  • the present invention relates to conversion presses.
  • the invention concerns a control device of the stroke pressure in conversion presses for converting stock shells into easy-open covers used as closing ends for drink and food cans and the like, although it is understood that the invention is also applicable to presses for working stocks of different kinds.
  • Conversion presses for semi-raw shells are known, including fixtures designed for converting such shells into easy-open covers, by virtue of a tab application that allows the opening of the same cover.
  • Known presses generally include a bed supporting lateral uprights on which is fastened, by means of tie rods extending through the uprights, a crown that generally supports the main drive means of the press motion members.
  • Sliding support guides for a ram which supports the tooling of the press upper die shoe, are connected to the uprights.
  • the uprights, the crown, the ram and besides the main component of the driving members like for instance the connecting rods and the crankshaft are influenced differently by thermal effect variations: mostly these elements contribute to the distance variation between the upper and lower die shoe tools.
  • the press stroke pressure varies during the productive cycle in consequence of the working space variation between the upper and the lower die shoe tools: this fact influences the shell working, particularly on scoring depth of their output or opening inlet and therefore on the qualitative level of formed covers.
  • the main object of the present invention is therefore to propose a device for conversion presses fit to check and regulate the press stroke pressure compensating thermal expansion and elastic deformation effects to which the main press moving component are submitted during its running.
  • Another object of the present invention is to propose a device able to check and correct continuously the press stroke pressure and with quick response times.
  • Further object of the present invention is to propose a device of easy realization, reliable running and maintenance.
  • the press 100 includes a bed 26, a crown 1, and uprights 4.
  • the bed 26 supports a lower die shoe 5 and four uprights 4, not interacting with the lower die shoe 5, placed to the sides of the lower die shoe and provided with longitudinal guides 21 turned toward the inside of the press 100.
  • the crown 1 is supported by the uprights 4 and is provided with motion members 60 of a ram 3, slidably guided by the longitudinal guides 21 and supporting an upper die shoe 6.
  • Lower 5 and upper 6 die shoes normally support dies or tools fit to progressive conversion of the shells into covers provided with tear tab.
  • each upright 4 Inside each upright 4 is housed a connecting rod 9 that maintains mutually constrained the crown 1 and the bed 26 through the co-operation with blocking members 10 placed near the ends of the connecting rods 9.
  • the blocking members 10 are essentially constituted by a bolt 24, screwed to the lower end of the relative connecting rod 9, and a ring nut 22 screwed to the upper ends of the connecting rod.
  • Spacer means 30 are seated inside the ring nut 22, that are constituted essentially by a ring piston 11 hydraulically driven by means of pressure fluid, through a duct 15, into the seat 27 made in the ring nut 22 and here placed also by virtue of seal rings 12 surrounding such seat.
  • the piston free end contacts the crown 1 for interposition of a spacer ring 14 fixed to the piston 11.
  • An external ring 13 is interposed between the ring nut 22 and the crown 1, placed externally to the spacer ring 14 and less high than this latter.
  • the device 40 includes moreover sensor members 7 placed on the uprights 4 and fit to detect their longitudinal dimensional variations.
  • the sensor members 7 are constituted by electric elongation sensors joined to the uprights 4, such as particular resistances.
  • the device 40 includes also control and command means 50 receiving in input the signals of the sensor members 7 and sending a control signal, through an estensimetric device 8, to a comparator 16 between this signal and a predefined reference signal of the same device, connected to a flow regulator 17 acting on a hydraulic proportional valve 18 connected to the ring piston 11 through the duct 15.
  • this device 40 is simple since, once the press 100 is operated, the sensor members 7 send a signal proportional to the elongation (or shrinkage) of the uprights 4 to the estensimetric device 8 sending a control signal to a comparator 16 that compares this signal and a predefined reference signal of the device.
  • This comparator 16 sends a signal to a flow regulator 17 that operates a hydraulic proportional valve 18 fit to check the fluid flow for putting in or pulling out from the seat 27 of the piston 11 so that respectively the ring nut 22 is moved away from the crown 1 in such a way of more stressing the connecting rod 9 or the ring nut 22 approaches the crown 1 so as to decrease the stress of the connecting rod 9.
  • the distance between the crown 1 and the ring nut 22 is comprised between 0 and 10 millimeters, even if it is primarily comprised between 0 and 1 millimeter.
  • the sensor members 7 include also load cells 23 placed under the lower die shoe 5 and are fit to send a signal proportional to the stroke pressure of the press 100 to the control and command means 50, so as to control, in feedback way, through the activation of the spacer means 30.
  • the device 40 by means of the sensor members 7, detects any longitudinal variation of the uprights 4, particularly any elongation due to their heating and therefore control, in feedback, the starting tension of the connecting rods 9 through activation of the spacer means 30.
  • This device detects any upright length variation and therefore adjusts the strength applied during the press closing, by means of a rapid balancing of the thermal corrections occurring inevitably between inoperative or operative press conditions.
  • the main advantage of the present invention is therefore to provide a device for conversion presses fit to check and regulate the press stroke pressure compensating thermal expansion and elastic deformation effects to which the main press moving components are submitted during the press operating.
  • Another advantage of the present invention is to provide a device fit to check and correct the press stroke pressure within press-cycle times.
  • Ulterior advantage of the present invention is to provide a device of sure, easy and reliable operations and of easy installation and maintenance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
EP98104092A 1998-03-09 1998-03-09 Dispositif pour le contrÔle de la pression de course dans une presse de formage Withdrawn EP0941833A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98104092A EP0941833A1 (fr) 1998-03-09 1998-03-09 Dispositif pour le contrÔle de la pression de course dans une presse de formage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98104092A EP0941833A1 (fr) 1998-03-09 1998-03-09 Dispositif pour le contrÔle de la pression de course dans une presse de formage

Publications (1)

Publication Number Publication Date
EP0941833A1 true EP0941833A1 (fr) 1999-09-15

Family

ID=8231549

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98104092A Withdrawn EP0941833A1 (fr) 1998-03-09 1998-03-09 Dispositif pour le contrÔle de la pression de course dans une presse de formage

Country Status (1)

Country Link
EP (1) EP0941833A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1177885A1 (fr) * 2000-08-01 2002-02-06 Haulick + Roos GmbH Machine automatique pour le pressage ou l'estampage
WO2003004144A1 (fr) * 2001-07-04 2003-01-16 Flow Holdings Sagl Presse exerçant une pression elevee

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3154006A (en) * 1962-10-12 1964-10-27 Danly Mach Specialties Inc Tensioning system for power press tie rods
US4502379A (en) * 1982-07-14 1985-03-05 Aida Engineering Ltd. Press frame
JPH02274399A (ja) * 1989-04-17 1990-11-08 Ishikawajima Harima Heavy Ind Co Ltd 機械プレスの剛性可変方法及び装置
EP0459224A1 (fr) * 1990-05-31 1991-12-04 Siemens Aktiengesellschaft Méthode d'actionnement d'une presse
US5285722A (en) * 1992-11-16 1994-02-15 The Minster Machine Company Press shutheight adjustment using hydraulic tie rod assemblies
EP0596697A1 (fr) * 1992-11-05 1994-05-11 Toyota Jidosha Kabushiki Kaisha Procédé et dispositif pour mesurer et régler les forces de pressage dans une presse
EP0741001A2 (fr) * 1995-05-04 1996-11-06 Gietz AG Estampeuse, imprimeuse et poinçonneuse

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3154006A (en) * 1962-10-12 1964-10-27 Danly Mach Specialties Inc Tensioning system for power press tie rods
US4502379A (en) * 1982-07-14 1985-03-05 Aida Engineering Ltd. Press frame
JPH02274399A (ja) * 1989-04-17 1990-11-08 Ishikawajima Harima Heavy Ind Co Ltd 機械プレスの剛性可変方法及び装置
EP0459224A1 (fr) * 1990-05-31 1991-12-04 Siemens Aktiengesellschaft Méthode d'actionnement d'une presse
EP0596697A1 (fr) * 1992-11-05 1994-05-11 Toyota Jidosha Kabushiki Kaisha Procédé et dispositif pour mesurer et régler les forces de pressage dans une presse
US5285722A (en) * 1992-11-16 1994-02-15 The Minster Machine Company Press shutheight adjustment using hydraulic tie rod assemblies
EP0741001A2 (fr) * 1995-05-04 1996-11-06 Gietz AG Estampeuse, imprimeuse et poinçonneuse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 032 (M - 1073) 25 January 1991 (1991-01-25) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1177885A1 (fr) * 2000-08-01 2002-02-06 Haulick + Roos GmbH Machine automatique pour le pressage ou l'estampage
WO2003004144A1 (fr) * 2001-07-04 2003-01-16 Flow Holdings Sagl Presse exerçant une pression elevee
US7310990B2 (en) 2001-07-04 2007-12-25 Avure Technologies Ab High-pressure press
US7650771B2 (en) 2001-07-04 2010-01-26 Avure Technologies Ab High-pressure press

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