EP0979691A1 - Poinçonneuse avec dispositif pour lubrifier la region de poinçonnage - Google Patents

Poinçonneuse avec dispositif pour lubrifier la region de poinçonnage Download PDF

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Publication number
EP0979691A1
EP0979691A1 EP98830307A EP98830307A EP0979691A1 EP 0979691 A1 EP0979691 A1 EP 0979691A1 EP 98830307 A EP98830307 A EP 98830307A EP 98830307 A EP98830307 A EP 98830307A EP 0979691 A1 EP0979691 A1 EP 0979691A1
Authority
EP
European Patent Office
Prior art keywords
lubricant
punchholder
punching
punching machine
punch
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.)
Granted
Application number
EP98830307A
Other languages
German (de)
English (en)
Other versions
EP0979691B1 (fr
Inventor
Stefano Raimondi
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.)
Rainer SRL
Original Assignee
Rainer SRL
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 Rainer SRL filed Critical Rainer SRL
Priority to EP19980830307 priority Critical patent/EP0979691B1/fr
Priority to DE69803846T priority patent/DE69803846D1/de
Publication of EP0979691A1 publication Critical patent/EP0979691A1/fr
Application granted granted Critical
Publication of EP0979691B1 publication Critical patent/EP0979691B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously

Definitions

  • the present invention relates to a punching machine comprising at least one punch assembly and a device for lubricating the punching region with a lubricant/compressed air mixture (atomized lubricant).
  • the punching machine described and claimed in the above patent comprises at least one punch assembly, in turn comprising means for feeding a lubricant/compressed air mixture onto the punching region; and a ram, in turn comprising a channel, which communicates with a corresponding channel in the punch assembly when the ram contacts the top of the punch assembly to perform the punching operation.
  • the position of the ram is detected by a sensor, which supplies position data to an electronic central control unit, which, in turn, by known means, opens and closes a solenoid valve controlling the instant in which the atomized lubricant is sprayed onto the punching region.
  • a sensor which supplies position data to an electronic central control unit, which, in turn, by known means, opens and closes a solenoid valve controlling the instant in which the atomized lubricant is sprayed onto the punching region.
  • the above machine provides for control on the basis of the vertical position of the ram; and the solenoid valve, which must be opened just before the cutting surface of the punch contacts the top surface of the sheet, is opened by a combination of the signal from the ram position sensor and a signal supplied to the electronic central control unit by a device for detecting the hydraulic pressure of a hydraulic circuit controlling vertical travel of the ram, so that a particularly complex, high-cost electronic central control unit is required to integrate the two signals.
  • the present invention employs a straightforward electromechanical device, such as a static relay, for opening and closing the solenoid valve.
  • a punching machine comprising:
  • top position refers to a first position in which the ram occupies any position involving no contact between the bottom surface of the ram and the top surface of a flange integral with the punch;
  • top dead center position refers to the position in which the cutting surface of the punch is about to contact the top surface of the underlying sheet;
  • bottom dead center position refers to the punch position in which the sheet has been punched and the ram is inverted.
  • Figure 1 shows a punch assembly 1 forming part of a punching machine 100.
  • Punch assembly 1 substantially comprises a punchholder 2, and a punch 3 housed inside punchholder 2; and punchholder 2 comprises a substantially cylindrical element 4, and a first annular flange 5 connected to element 4 by a number of screws 6 (only one shown in Figure 1).
  • punch 3 is connected to a cylindrical central body 7 by means of a threaded element 8 housed inside a seat 9 formed in a channel 10 along the central longitudinal axis A-A of cylindrical central body 7.
  • the bottom horizontal surface of a head 11 of threaded element 8 rests on a shoulder 12 forming part of seat 9 formed in channel 10, while a shank 13 of threaded element 8 is screwed to punch 3 to connect punch 3 to cylindrical central body 7 and enable punch 3 to be changed rapidly.
  • cylindrical central body 7 is fitted with a ring nut 14 by means of a number of screws 15; and ring nut 14 is stressed by one end of an elastic element 16 (a Belleville washer in Figure 1), the opposite end of which rests on the top surface of first annular flange 5, so that cylindrical central body 7 and punch 3 - which, as stated, is connected to cylindrical central body 7 by threaded element 8 - are both stressed elastically by elastic element 16.
  • an elastic element 16 a Belleville washer in Figure 1
  • Ring nut 14 is acted on directly by a ram 17, which, during the punching operation, travels downwards in the direction defined by longitudinal axis A-A of cylindrical central body 7.
  • first annular flange 5 mates with a mating surface 19 of a second annular flange 20, which travels vertically along a first number of threaded guide pins 21 (only one shown in Figure 1) screwed to a turret 22 and extending through holes 23 formed for the purpose in second annular flange 20.
  • second annular flange 20 also comprises a second number of threaded pins 24 (only one shown in Figure 1) integral with flange 20 and corresponding with a number of cavities 25 (only one shown in Figure 1) formed in turret 22; and each cavity 25 houses elastic means 26, e.g. a coil spring, for elastically stressing the bottom surface of second annular flange 20.
  • elastic means 26 e.g. a coil spring
  • a bush 27, integral with turret 22, provides for guiding the up and down movement of punchholder 2.
  • a key 28 is fitted to turret 22 by means of screws 29, and projects through an opening 31 in bush 27 into a groove 30 provided for the purpose on punchholder 2.
  • punchholder 2 is fitted integrally with an annular blankholder body 33, which, at the work stage, rests on and provides for clamping a sheet 34.
  • Punch assembly 1 in Figure 1 operates as follows:
  • Ring nut 14, ram 17, threaded element 8 and element 4 comprise respective longitudinal channels 14a, 17a, 8a, 4a extending along axis A-A, while element 4 also comprises a given number of channels 4b extending radially with respect to channel 4a.
  • the lubricant/compressed air mixture (atomized lubricant) supplied by a source 50 flows first along a conduit 51 and then out into channels 14a, 17a, 8a, 4a, 4b in series with one another.
  • the atomized lubricant supply from source 50 is controlled by solenoid valve 52, which is opened, as described later on, by electromechanical means.
  • atomized lubricant flow is controlled and regulated by a unit 35 substantially comprising detecting means 36 integral with a supporting element 37, and which may comprise a magnetic proximity probe operating according to known electromagnetic principles.
  • Electromechanical device 41 therefore provides for selectively opening or closing solenoid valve 52 to permit or prevent lubricant/compressed air mixture supply to the front cutting surface 3a of punch 3 where the atomized lubricant is sprayed onto the punching region ZP.
  • the atomized lubricant is also fed to a number of channels 4b (only one shown) extending radially with respect to axis A-A, and which come out inside an annular gap 48 defined laterally and at the top by punch 3 and bush 27, and at the bottom by annular blankholder body 33.
  • the atomized lubricant seeps into the gap between annular blankholder body 33 and the bottom end of punch 3 to also lubricate both and so provide for smooth slide of one with respect to the other when the system moves from the Figure 2 to the Figure 3 position.
  • element 37 supporting detecting means 36 is movable vertically in two directions to regulate the instant in which solenoid valve 52 is opened.
  • Figures 4-6 show a second embodiment of the present invention, which, as opposed to a magnetic proximity probe 36 as in Figures 1-3, employs a light source 36 for emitting a beam which is reflected by any moving element forming part of punchholder 2.
  • the beam is reflected by annular flange 20 and is picked up and reprocessed by known electronic means (not shown in Figures 4-6), so that, by detecting the position of annular flange 20 of punchholder 2, solenoid valve 52 ( Figure 1) is opened and closed, as described previously, to control supply of the atomized lubricant to punch 3 via conduit 51 and channels 17a, 14a, 10, 8a, 4a, 4b.
  • any system equivalent to those described may obviously be used to detect the downward travel of punchholder 2 of punch assembly 1 and so regulate supply of atomized lubricant to punch 3, without, however, departing from the scope of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
EP19980830307 1998-05-20 1998-05-20 Poinçonneuse avec dispositif pour lubrifier la région de poinçonnage Expired - Lifetime EP0979691B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19980830307 EP0979691B1 (fr) 1998-05-20 1998-05-20 Poinçonneuse avec dispositif pour lubrifier la région de poinçonnage
DE69803846T DE69803846D1 (de) 1998-05-20 1998-05-20 Stanze mit einer Vorrichtung zum Schmieren des Stanzbereiches

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19980830307 EP0979691B1 (fr) 1998-05-20 1998-05-20 Poinçonneuse avec dispositif pour lubrifier la région de poinçonnage

Publications (2)

Publication Number Publication Date
EP0979691A1 true EP0979691A1 (fr) 2000-02-16
EP0979691B1 EP0979691B1 (fr) 2002-02-13

Family

ID=8236656

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980830307 Expired - Lifetime EP0979691B1 (fr) 1998-05-20 1998-05-20 Poinçonneuse avec dispositif pour lubrifier la région de poinçonnage

Country Status (2)

Country Link
EP (1) EP0979691B1 (fr)
DE (1) DE69803846D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2361453A (en) * 2000-01-27 2001-10-24 Victor Ken Seng Wu Lubrication device adapted to be used in a punching machine
US7757372B2 (en) 2003-09-18 2010-07-20 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Sheet metal processing methods utilizing a combined punching and forming machine
CN115255138A (zh) * 2022-08-12 2022-11-01 海盐恒欣宇模具有限责任公司 一种可微调模具冲头的冲压模具
CN115592027A (zh) * 2022-10-14 2023-01-13 安徽黄山恒久链传动有限公司（Cn） 一种基于plc控制的链条冲压头自动上油设备及控制系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533889A (en) * 1979-07-23 1980-03-10 Anritsu Corp Numerical control press machine provided with die operation detector
US4977804A (en) * 1988-02-05 1990-12-18 Amada Company, Limited Punch press

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533889A (en) * 1979-07-23 1980-03-10 Anritsu Corp Numerical control press machine provided with die operation detector
US4977804A (en) * 1988-02-05 1990-12-18 Amada Company, Limited Punch press

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2361453A (en) * 2000-01-27 2001-10-24 Victor Ken Seng Wu Lubrication device adapted to be used in a punching machine
GB2361453B (en) * 2000-01-27 2003-10-15 Victor Ken Seng Wu Lubrication device adapted to be used in a punching machine
US7757372B2 (en) 2003-09-18 2010-07-20 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Sheet metal processing methods utilizing a combined punching and forming machine
CN115255138A (zh) * 2022-08-12 2022-11-01 海盐恒欣宇模具有限责任公司 一种可微调模具冲头的冲压模具
CN115592027A (zh) * 2022-10-14 2023-01-13 安徽黄山恒久链传动有限公司（Cn） 一种基于plc控制的链条冲压头自动上油设备及控制系统

Also Published As

Publication number Publication date
DE69803846D1 (de) 2002-03-21
EP0979691B1 (fr) 2002-02-13

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