WO2009109882A1 - Appareil de perforation - Google Patents

Appareil de perforation Download PDF

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Publication number
WO2009109882A1
WO2009109882A1 PCT/IB2009/050804 IB2009050804W WO2009109882A1 WO 2009109882 A1 WO2009109882 A1 WO 2009109882A1 IB 2009050804 W IB2009050804 W IB 2009050804W WO 2009109882 A1 WO2009109882 A1 WO 2009109882A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
housing
punching
way
housing means
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.)
Ceased
Application number
PCT/IB2009/050804
Other languages
English (en)
Inventor
Giorgio Ostini
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.)
Euromac SpA
Original Assignee
Euromac 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 Euromac SpA filed Critical Euromac SpA
Priority to EP09718256A priority Critical patent/EP2259916A1/fr
Publication of WO2009109882A1 publication Critical patent/WO2009109882A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B30B15/34—Heating or cooling presses or parts thereof
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure

Definitions

  • the invention relates to a punching apparatus, suitable for being fitted on punching machines for working pieces in the shape of sheets, bars, profiles and the like made of metal or plastic material.
  • punching machines that comprise a punching head, a support surface for the pieces to be punched, located underneath the punching head and a supporting base for both the support surface and the punching head.
  • a presser cylinder is housed that can be driven with a fluid, normally oil, that works by pressing on one or more punches arranged in a special housing seat, inside a suitable punch-holder, obtained in the punching head underneath this presser cylinder.
  • a fluid normally oil
  • a housing seat is obtained in the support surface for housing female dies designed to internally receive the tips of the punches during the punching phase.
  • This arrangement of the punches and the dies calls for the vertical alignment between these to be very precise, i.e. coaxial, to prevent any misalignment damaging the punches due to an imperfect coupling with the respective dies during their punching stroke.
  • both the punching head and the support surface of the materials to be punched are made in a one piece that forms the body of the punching machine.
  • the prior state of the art has the following drawback: when a piece is punched, the oil that drives the presser cylinder heats up a lot due to the increase in pressure it has to withstand.
  • This heating is transmitted by heat conduction to the punching head body, causing the latter to dilate.
  • This dilation causes outward movement, mainly towards the front of the punching machine, of the seat in which the punch-holder is housed, with respect to the seat obtained in the support surface in which the dies are housed.
  • This movement which has been ascertained to be around one hundredth of a millimetre for every degree of thermal difference, called "Dt", between the punching head and the support surface, determines a misalignment between the punches and the respective dies, which is proportionately greater when the pieces to be punched have reduced thicknesses.
  • One object of the invention is to upgrade the state of the prior art.
  • Another object of the invention is to make a punching apparatus that allows maintaining the punches and the dies aligned in the punching machines, during all the operating phases of the latter, in particular also during the punching phase, when the fluid that drives the presser cylinder heats up and, consequently, the punching head dilates.
  • a punching apparatus comprising: first housing means in which punching means can be arranged that can be driven by driving means and having a first temperature; second housing means in which die means can be arranged, positioned aligned with said punching means, having a second temperature, characterized in that heat adjustment means are provided to make/maintain said first temperature and second temperature substantially the same.
  • a method for adjusting heat dilations in punching apparatus comprising: first housing means for housing punching means; second housing means for housing die means placed aligned with said punching means, characterized in that it comprises adjusting/maintaining a first temperature of said first housing means and a second temperature of said second housing means substantially the same at least during punching operations, in such a way that said first housing means and second housing means have dilations substantially similar in terms of value and direction.
  • Figure 1 is a side schematic view and on a reduced scale of a punching machine having the punching apparatus according to the invention
  • Figure 2 is a very schematic front view of a punching area of the punching machine of Figure 1 ;
  • Figure 3 is a very schematic front view of a second version of a punching area of a punching apparatus according to the invention.
  • Figure 4 is a side schematic view and on a reduced scale of a punching machine having the punching apparatus according of Figure 3.
  • a punching machine which comprises a frame 2 that is made up of a head 3 and of a base 4, having a worktable 5 on which pieces to be punched can be rested.
  • the inside of the head 3 houses an upper part of a punching apparatus, generally indicated by 6, while a lower part of this is housed in the worktable 5, in such a way as to be vertically aligned with the upper part.
  • the upper part schematically comprises a presser cylinder 7 which is driven up and down by means of a hydraulic supply unit 8 which, during punching operations, sends the presser cylinder 7 an adequate volume of oil under pressure.
  • the presser cylinder 7 is arranged above a first housing 9, normally having the possibility of turning, inside which one or more punches can be arranged to perform the punching operations and which is supported on the punching machine by means of a support 9A.
  • the punches both single and multiple, even though not visible in the drawings, are normally positioned inside respective punch-holders, which in turn are housed in specific seats arranged inside the first housing 9.
  • the lower part of the punching apparatus comprises a second housing 10, this too having the possibility of turning, in which dies 1 1 are arranged, in such a way that they are vertically aligned with the respective punches arranged in the first housing 9.
  • the second housing 10 is supported by a base 12 which is associated with the frame 2 of the punching machine 1 in a conventional way.
  • the supply unit 8 is hydraulically connected to this by means of a delivery pipe 13 and a backflow pipe 14.
  • the supply unit 8 comprises a tank 8A for containing the oil and a pumping unit 8B to pump it to the presser cylinder 7.
  • a section 14A is derived of a further pipe that connects it to the base 12; from the latter departs a further section 14B of backflow pipe that empties into the tank 8A.
  • the two sections of pipe 14A and 14B are connected together and in the connection area, at the base 12, are shaped so as to cross it or wrap around a considerable portion of it.
  • the heating of the presser cylinder 7 and of the support 9A occurs spontaneously and is determined by the increase in temperature of the oil inside the presser cylinder 7, due to the increase in pressure to perform a punching operation: this heating determines an increase in temperature which is transmitted to the support 9A and to the head 3 by conduction, until a first temperature T1 is reached.
  • the base 12 is at a second temperature T2, which is lower than the temperature T1 , but, during the punching phases, it is heated, according to a first possible embodiment of the punching apparatus 1 , by the same oil overheated during the compression phase which is contained in the presser cylinder 7 and which returns overheated towards the tank 8A.
  • a part of this oil is deviated towards the further delivery pipe section 14A, by means of a valve 16.
  • This overheated oil licks the base 12 of this, which, due to the induced heating, also dilates in the same direction as the dilation of the support 9A, and, therefore, of the upper housing 9 and to a value substantially the same as this, also moving with it the second lower housing 10.
  • the oil used to heat the base 12 is then made to return to the tank 8A through the further backflow pipe section 14B.
  • the circulation of the oil in the delivery pipe 13, backflow pipe 14 and in the further delivery section 14A and backflow section 14B is produced by the operation of the pumping unit 8B.
  • a cooling device can be fitted at this support 9A, such as, for example, a heat exchanger or an apparatus for blowing cold air on the support 9A, in such a way that, even if the oil inside the presser cylinder 7 heats up during the pressure increase due to punching, non-significant temperature increases are induced on the support 9A of the first housing 9 or, in any case, in the head 3, such as to determine its dilation.
  • the operation of the punching apparatus 6 is the following: when a piece has to be punched, e.g. a metal sheet, it is arranged between the first upper housing 9 and the second lower housing 10, by means of gripper devices with which the punching machine is equipped and which move on the worktable 5.
  • a piece has to be punched, e.g. a metal sheet
  • it is arranged between the first upper housing 9 and the second lower housing 10, by means of gripper devices with which the punching machine is equipped and which move on the worktable 5.
  • the punching operation starts that calls for an increase in the pressure of the oil inside the supply unit 8, to start the presser cylinder 7, in such a way that this moves towards the first upper housing 9, inside which the punches to be used are placed.
  • the increase in pressure causes the consequent overheating of the oil inside the presser cylinder 7, bringing this to a temperature T1 which is transmitted by conduction also to the head 3 and to the support 9A of the first upper housing 9.
  • This increase in temperature causes a gradual dilation of the support 9A and of the head 3 which causes the first housing 9 to move by a few hundredths of a millimetre and this moves to position 9'.
  • the second lower housing 10 and the base 12 of this, at the start of the punching operation, are at a normal temperature T2, lower than the temperature T1.
  • the base 12, or directly the second housing 10 are heated to raise the normal temperature T2 until the same temperature T1 is substantially reached.
  • the base 12 or the second housing 10 consequently undergo the same substantial dilation of a few hundredths of a millimetre, until they reach the position 10'.
  • This second dilation therefore makes it possible to substantially maintain unchanged the alignment between the punches and the respective dies 1 1 , preventing the occurrence of any misaligned couplings of these.
  • the heating of the base 12 and/or of the second lower housing 10 can occur, according to a first possible embodiment of the punching apparatus, by taking volumes of overheated oil from the supply unit 8 and conveying these to lick the base 12 and/or the second housing 10 by means of the further section of delivery pipe 14A.
  • valve 16 which is normally closed, but which opens on command in a controlled way, deviates, when open, a part of the oil flow overheated at the temperature T1 towards the section of pipe 14A and this returns from the presser cylinder 7 towards the tank 8A.
  • this part of the oil flow reaches the base 12, which is at the normal temperature T2 and, by conduction, heats it until it substantially reaches the temperature T1 , creating the previously-described dilation.
  • the punching apparatus it is also possible to have, in replacement of the sections of pipe 14A and 14B and of the pump 16, the fitting of heating wire resistances 15 inside the base 12, or arranged around this, in such a way that it is heated to the temperature T1.
  • a known cooling device such as, for example, a cold-air blowing apparatus that invests both the head 3 and the support 9A.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

La présente invention concerne un appareil de perforation qui comprend : un premier moyen de logement (9, 9A) dans lequel le moyen de perforation peut être agencé et qui peut être entraîné par un moyen d'entraînement (7, 8) et ayant une première température (T1) ; un second moyen de logement (10, 12) dans lequel le moyen de matrice (11) peut être agencé, aligné avec ledit moyen de perforation, ayant une seconde température (T2) ; un moyen de réglage de la chaleur (14A, 14B ; 15) fourni pour amener/maintenir la première température (T1) et la seconde température (T2) sensiblement identiques.
PCT/IB2009/050804 2008-03-01 2009-02-27 Appareil de perforation Ceased WO2009109882A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09718256A EP2259916A1 (fr) 2008-03-01 2009-02-27 Appareil de perforation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0803924.0 2008-03-01
GB0803924A GB2461114A (en) 2008-03-01 2008-03-01 Punching Apparatus with temperature control means

Publications (1)

Publication Number Publication Date
WO2009109882A1 true WO2009109882A1 (fr) 2009-09-11

Family

ID=39315857

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/050804 Ceased WO2009109882A1 (fr) 2008-03-01 2009-02-27 Appareil de perforation

Country Status (3)

Country Link
EP (1) EP2259916A1 (fr)
GB (1) GB2461114A (fr)
WO (1) WO2009109882A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102886422A (zh) * 2012-10-22 2013-01-23 安徽工业大学 一种提高板材翻边能力的冲孔方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2076999A (en) * 1980-05-19 1981-12-09 Amada Co Ltd Method and apparatus for controlling heat deformations of machine tools
GB2119686A (en) * 1982-05-12 1983-11-23 American Can Co Method and apparatus for making drawn containers
US20030042294A1 (en) * 2001-08-31 2003-03-06 Seiki Matsumoto Method and device for pressing workpiece
JP2005305464A (ja) * 2004-04-16 2005-11-04 Kitagawa Elaborate Mach Co Ltd プレス装置およびプレス装置システム
JP2006334959A (ja) * 2005-06-03 2006-12-14 Gunma Univ 熱可塑性樹脂の真空成形方法及びその装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0747531A (ja) * 1993-08-07 1995-02-21 Murata Mfg Co Ltd プレス装置の温度調節方法
US6550302B1 (en) * 1999-07-27 2003-04-22 The Regents Of The University Of Michigan Sheet metal stamping die design for warm forming
WO2003037544A1 (fr) * 2001-10-29 2003-05-08 Daiwa Can Company Dispositif et procede de fabrication d'une coque de recipient sans soudures en metal a revetement en resine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2076999A (en) * 1980-05-19 1981-12-09 Amada Co Ltd Method and apparatus for controlling heat deformations of machine tools
GB2119686A (en) * 1982-05-12 1983-11-23 American Can Co Method and apparatus for making drawn containers
US20030042294A1 (en) * 2001-08-31 2003-03-06 Seiki Matsumoto Method and device for pressing workpiece
JP2005305464A (ja) * 2004-04-16 2005-11-04 Kitagawa Elaborate Mach Co Ltd プレス装置およびプレス装置システム
JP2006334959A (ja) * 2005-06-03 2006-12-14 Gunma Univ 熱可塑性樹脂の真空成形方法及びその装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102886422A (zh) * 2012-10-22 2013-01-23 安徽工业大学 一种提高板材翻边能力的冲孔方法

Also Published As

Publication number Publication date
GB2461114A (en) 2009-12-30
EP2259916A1 (fr) 2010-12-15
GB0803924D0 (en) 2008-04-09

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