EP0979691B1 - Punching machine with a device for lubricating the punching region - Google Patents
Punching machine with a device for lubricating the punching region Download PDFInfo
- Publication number
- EP0979691B1 EP0979691B1 EP19980830307 EP98830307A EP0979691B1 EP 0979691 B1 EP0979691 B1 EP 0979691B1 EP 19980830307 EP19980830307 EP 19980830307 EP 98830307 A EP98830307 A EP 98830307A EP 0979691 B1 EP0979691 B1 EP 0979691B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- punching
- lubricant
- punchholder
- 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.)
- Expired - Lifetime
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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 in Figure 1 of 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.
- 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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Punching Or Piercing (AREA)
Description
Claims (6)
- A punching machine (100) comprising:at least one punchholder (2) with an annular blankholder (33) for punching a metal sheet (34);said at least one punchholder (2) comprising a first channel (14a, 10, 8a, 4a, 4b) for feeding a lubricant/compressed air mixture (atomized lubricant) to a punching region (ZP) on said sheet (34);a ram (17) for striking said punchholder (2), and comprising a second channel (17a) for selectively feeding said lubricant/compressed air mixture to said first channel (14a, 10, 8a, 4a, 4b) after the bottom surface of said ram (17) contacts the top surface of said punchholder (2);piping means (51) for connecting said first (14a, 10, 8a, 4a, 4b) and second (17a) channels to a source (50) of said lubricant/compressed air mixture; andon/off valve means (52) for selectively permitting or preventing supply of said lubricant/compressed air mixture to said pipe means (51) and to said first (14a, 10, 8a, 4a, 4b) and second (17a) channels;said valve means (52) being controlled, by means of a control unit (38), by the position in space of a member (2) on said punching machine (100); said position in space being detected by detecting means (36);and the punching machine (100) being characterized in that said detecting means (36) detects the vertical position of said at least one punchholder (2), whereby the control means is such that lubricant is supplied to the punching region (ZP) the instant the said blankholder (33) contacts the workpiece.
- A punching machine (100) as claimed in Claim 1, wherein said detecting means (36) are defined by a magnetic proximity probe (36).
- A punching machine (100) as claimed in any one of the foregoing Claims, wherein a supporting element (37) for supporting said detecting means (36) is movable vertically to regulate the instant in which said valve means (52) are opened.
- A punching machine (100) as claimed in Claim 1, wherein said detecting means (36) comprise a light source for producing a beam reflected by an element (20) forming part of said punchholder (2).
- A punching machine (100) as claimed in any one of the foregoing Claims, wherein said valve means (52) are opened and closed by means of an electromechanical device (41).
- A punching machine (100) as claimed in Claim 5, wherein said electromechanical device (41) is a static relay (41).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19980830307 EP0979691B1 (en) | 1998-05-20 | 1998-05-20 | Punching machine with a device for lubricating the punching region |
DE69803846T DE69803846D1 (en) | 1998-05-20 | 1998-05-20 | Punch with a device for lubricating the punching area |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19980830307 EP0979691B1 (en) | 1998-05-20 | 1998-05-20 | Punching machine with a device for lubricating the punching region |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0979691A1 EP0979691A1 (en) | 2000-02-16 |
EP0979691B1 true EP0979691B1 (en) | 2002-02-13 |
Family
ID=8236656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980830307 Expired - Lifetime EP0979691B1 (en) | 1998-05-20 | 1998-05-20 | Punching machine with a device for lubricating the punching region |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0979691B1 (en) |
DE (1) | DE69803846D1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2361453B (en) * | 2000-01-27 | 2003-10-15 | Victor Ken Seng Wu | Lubrication device adapted to be used in a punching machine |
ATE341409T1 (en) | 2003-09-18 | 2006-10-15 | Trumpf Werkzeugmaschinen Gmbh | COMBINED PUNCHING/FORMING MACHINE AND PROCESSING PROCESS THEREOF |
CN115255138B (en) * | 2022-08-12 | 2023-07-07 | 海盐恒欣宇模具有限责任公司 | Stamping die capable of finely adjusting die punch |
CN115592027A (en) * | 2022-10-14 | 2023-01-13 | 安徽黄山恒久链传动有限公司(Cn) | Automatic oiling equipment and control system for chain stamping head based on PLC control |
Family Cites Families (2)
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 |
DE3903134C5 (en) * | 1988-02-05 | 2005-12-15 | Amada Co., Ltd., Isehara | punch press |
-
1998
- 1998-05-20 DE DE69803846T patent/DE69803846D1/en not_active Expired - Lifetime
- 1998-05-20 EP EP19980830307 patent/EP0979691B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0979691A1 (en) | 2000-02-16 |
DE69803846D1 (en) | 2002-03-21 |
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