EP1593444A1 - Punch assembly - Google Patents
Punch assembly Download PDFInfo
- Publication number
- EP1593444A1 EP1593444A1 EP05103777A EP05103777A EP1593444A1 EP 1593444 A1 EP1593444 A1 EP 1593444A1 EP 05103777 A EP05103777 A EP 05103777A EP 05103777 A EP05103777 A EP 05103777A EP 1593444 A1 EP1593444 A1 EP 1593444A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- chamber
- punch
- punch assembly
- pressurized fluid
- 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- Withdrawn
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Images
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
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/161—Control arrangements for fluid-driven presses controlling the ram speed and ram pressure, e.g. fast approach speed at low pressure, low pressing speed at high pressure
-
- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/20—Applications of drives for reducing noise or wear
-
- 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
- B30B1/323—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 using low pressure long stroke opening and closing means, and high pressure short stroke cylinder means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
- F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
- F15B11/0325—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters the fluid-pressure converter increasing the working force after an approach stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/214—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being hydrotransformers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press
Abstract
Sheet metal or similar is punched by means of a ram
(6), which is moved in a straight reciprocating movement
defined by a down stroke to punch at least one metal
sheet, and by a return stroke, and has a first member (9)
moved with a given law of motion during the down stroke
and the return stroke, and a second member (19) which is
connected in sliding manner to the first member (9), is
brought into contact with a punch to punch the metal
sheet, and is moved, during the down stroke, with
substantially the same law of motion as the first member
(9) when the metal sheet produces a resisting force below
a given value, and with a law of motion different from
that of the first member (9) when the metal sheet
produces a resisting force at least equal to the given
value.
Description
- The present invention relates to a punch assembly.
- In the working of sheet metal or similar, a punch assembly is known comprising a ram movable along a given longitudinal axis; and an actuating device for moving the ram axially in a straight reciprocating movement comprising a down stroke to punch at least one sheet, and a return stroke.
- The actuating devices of known punch assemblies of the above type are normally of two types.
- In a first type, the actuating device comprises a hydraulic pump, and a hydraulic circuit for supplying the ram with pressurized fluid, and has various drawbacks due to losses mainly caused by the efficiency of the hydraulic pump and leakage in the hydraulic supply circuit.
- In a second type, the actuating device comprises an electric motor having an output shaft normally connected to the ram by a screw-nut screw coupling, and has various drawbacks, mainly due to the fact that, for the thrust exerted on the ram to be greater than the resisting force of the sheet, the electric motor and the screw-nut screw coupling must be designed as a function of relatively high resisting force values, and as such are relatively expensive and bulky.
- It is an object of the present invention to provide a punch assembly designed to eliminate the aforementioned drawbacks, and which is cheap and easy to produce.
- According to the present invention, there is provided a punch assembly as claimed in
Claim 1. - A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
- Figure 1 shows a schematic longitudinal section, with parts removed for clarity, of a preferred embodiment of the punch assembly according to the present invention;
- Figures 2 to 5 show, schematically, the Figure 1 punch assembly in four different operating positions.
-
-
Number 1 in Figure 1 indicates as a whole a punch assembly for punching sheet metal or similar, and comprising a tubular supportingframe 2 having a substantially verticallongitudinal axis 3 and in turn comprising a wide top portion 4 and anarrow bottom portion 5. -
Assembly 1 also comprises aram 6 movable alongframe 2 in avertical direction 7 parallel toaxis 3; and anactuating device 8 for imparting to ram 6 a straight reciprocating movement comprising a down stroke, in whichram 6 moves from a raised position to a lowered position to punch at least one metal sheet (not shown), and a return stroke, in whichram 6 moves back into the raised position. - Ram 6 comprises a
top member 9 mounted coaxially withaxis 3 and in turn comprising a substantially cup-shapedtop portion 10 extending along portion 4, and a pin-like bottom portion 11 extending alongportion 5 offrame 2. -
Portion 10 is connected by a screw-nut screw coupling to ascrew 12 forming part ofdevice 8, and which is rotated aboutaxis 3 by anelectric motor 13 having anoutput shaft 14, which is mounted to rotate about alongitudinal axis 15 substantially parallel toaxis 3, and is connected toscrew 12 by abelt drive 16 comprising twopulleys 17 fitted toshaft 14 andscrew 12 respectively, and abelt 18 looped aboutpulleys 17. Asscrew 12 rotates aboutaxis 3,member 9 is moved indirection 7 between the raised and lowered positions with a given law of motion. - Ram 6 also comprises a
bottom member 19 in turn comprising a tubulartop body 20, which is fitted in sliding manner to bothportion 5 offrame 2 and portion 11 ofmember 9, defines a variable-volume, annularfirst chamber 21 together withframe 2 and portion 11 ofmember 9, and is closed at a free end by apin 22. In actual use,pin 22 activates a punch (not shown) for working the metal sheet (not shown), and defines, together withbody 20 and with apiston 23 fixed to the end of portion 11 and perpendicular toaxis 3, a variable-volume, cylindricalsecond chamber 24 with a smaller cross section thanchamber 21. - With reference to Figures 2 to 5,
chambers hydraulic oil circuit 25 comprising afirst portion 26, which extends betweenchambers valve device 27 for selectively controlling pressurized-oil flow betweenchambers -
Device 27 comprises a knownfirst valve 28 having aslide 29, which is normally maintained by aspring 30 in a closed position closing portion 26 (Figures 2, 4, 5), and is moved, in opposition tospring 30 and by the pressurized oil, from the closed position to an open position (Figure 3) permitting oil flow fromchamber 24 tochamber 21.Device 27 also comprises a knownsecond valve 31, which is mounted parallel tovalve 28, is normally set to a closedposition closing portion 26, and is movable by the pressurized oil from the closed position to an open position permitting oil flow fromchamber 21 tochamber 24. -
Chamber 21 communicates hydraulically with anoil tank 32 via asecond portion 33 ofcircuit 25 having threevalve devices tank 32 andchamber 21. -
Device 34 comprises a knownfirst valve 37 having aslide 38, which is normally maintained by aspring 39 in a closed position closing portion 33 (Figures 2, 3, 4), and is moved, in opposition tospring 39 and by the pressurized oil, from the closed position to an open position (Figure 5) permitting oil flow fromchamber 21 totank 32.Device 34 also comprises a knownsecond valve 40, which is mounted parallel tovalve 37, is normally set to a closedposition closing portion 33, and is movable by the pressurized oil from the closed position to an open position permitting oil flow fromtank 32 tochamber 21. -
Device 35 is mounted betweenchamber 21 anddevice 34, and comprises aslide 41, which is normally maintained by aspring 42 in a first operating position (Figures 2, 3) permitting pressurized-oil flow fromtank 32 tochamber 21, and is moved, in opposition tospring 42 and by an actuating device (not shown) controlled by an electronic central control unit (not shown), from the first operating position to a second operating position (Figures 4, 5) permitting oil flow fromchamber 21 totank 32. -
Device 36 comprises a knownvalve 43, which is mounted parallel todevices position closing portion 33, and is movable by the pressurized oil from the closed position to an open position permitting oil flow fromtank 32 tochamber 21. - Operation of
punch assembly 1 will now be described with reference to Figures 2 to 5, and as of the instant (Figure 2) in which: -
ram 6 is in the raised position, andchamber 24 is therefore at maximum volume and substantially full of oil at a higher pressure than the oil intank 32; -
valves portion 26 are in the closed position; -
valves portion 33 are in the closed position; and -
slide 41 is in the first operating position. -
-
Electric motor 13 is operated to rotateoutput shaft 14 and, therefore, screw 12 to movetop member 9 ofram 6 indirection 7 with said given law of motion. - As
top member 9 moves indirection 7,bottom member 19 is moved downwards indirection 7 bytop member 9 via the interposition of the oil inchamber 24 and into contact with said punch (not shown), and the volume ofchamber 21 increases toopen valves tank 32 tochamber 21. - When the metal sheet (not shown) being punched exerts a resisting force below a given value on the punch (not shown), and therefore on
bottom member 19,members members screw 12, thus enabling the punch (not shown) to punch the metal sheet (Figure 2). - As shown in Figure 5, at the end of the down stroke to punch the metal sheet (not shown), the electronic central control unit (not shown) moves
slide 41 into the second operating position, the rotation direction ofscrew 12 is inverted, andmembers direction 7 from the lowered position to the raised position with the same law of motion, i.e. the law of motion imposed onmembers screw 12. - During the return stroke of
members chamber 21 decreases, and the oil inchamber 21 is fed alongportion 33 ofhydraulic circuit 25 and throughslide 41 to closevalves open valve 37, and so feed the oil back totank 32. - When the metal sheet (not shown) being punched exerts a resisting force greater than a given value on the punch (not shown), and therefore on
bottom member 19,member 9 is moved indirection 7 from the raised position to the lowered position with the law of motion imposed by rotation ofscrew 12, whereasmember 19 is initially prevented from moving indirection 7 by the resisting force of the metal sheet (not shown). - As
member 9 moves with respect tomember 19, the oil inchamber 24 is first compressed bypiston 23 to open valve 28 (Figure 3), and is then fed fromchamber 24 tochamber 21. Sincechamber 21 has a larger cross section thanchamber 24, the pressure of the oil inchamber 21 generates onmember 19, and therefore on the punch (not shown), a thrust which is greater than the thrust generated by the pressure of the oil inchamber 24, is greater than the resisting force of the metal sheet (not shown), thus enabling the punch (not shown) to punch the metal sheet (not shown), and movesmember 19 downwards indirection 7 with a different law of motion from that ofmember 9, i.e. from the law of motion imposed by rotation ofscrew 12. - In connection with the above, it should be pointed out that, during punching of the metal sheet (not shown),
valve device 35 prevents the oil fed alongportion 26 and throughvalve 28 fromopening valve 37 and so being fed to tank 32. - Once the down stroke is completed and the metal sheet (not shown) is punched:
-
chamber 24 is at minimum volume (Figure 3), so thatvalve 28 is again closed by spring 30 (Figure 4); - the electronic central control unit (not shown) opens slide 41 (Figure 4);
- the punch (not shown) is disengaged from the metal sheet (not shown) by a known elastic thrust device (not shown) associated with the punch (not shown) itself; and
- the rotation direction of
screw 12 is inverted to movemember 9 back from the lowered position to the raised position (Figure 4). -
- As
slide 41 opens and the volume ofchamber 24 increases, the oil inchamber 21 is fed alongportion 26 and throughvalve 31 tochamber 24, as well as alongportion 33 to open valve 37 (Figure 5) and flow back intotank 32. - Finally, when
member 9 is in the raised position,slide 41 is deactivated and moved byspring 42 back into the first operating position, andvalve 37 is again closed by spring 39 (Figure 2). -
Punch assembly 1 therefore has various advantages, mainly due to the fact that, when the resisting force of the metal sheet (not shown) is below said given value, the metal sheet (not shown) is punched by means of the thrust imparted tomembers electric motor 13, i.e. by a relatively small electric motor, whereas, when the resisting force of the metal sheet (not shown) is greater than said given value, the metal sheet (not shown) is punched by means of the thrust imparted tomember 19 by the pressurized oil inhydraulic circuit 25, i.e. in a hydraulic circuit with no hydraulic pumps.
Claims (14)
- A punch assembly comprising a ram (6) movable along a given longitudinal axis (3); and actuating means (8) for imparting to the ram (6) a straight reciprocating movement comprising a down stroke to punch at least one metal sheet or similar, which produces a resisting force in opposition to the ram (6), and a return stroke; the ram (6) comprising a first portion (9) moved with a given first law of motion by said actuating means (8) during the down stroke and the return stroke, and a second portion (19) which, in use, engages a punch to punch the sheet metal; the punch assembly being characterized in that the second portion (19) is connected in sliding manner to the first portion (9); thrust means (25) moving the second portion (19) axially, during said down stroke, substantially with said first law of motion when the resisting force is below a given value, and with a second law of motion, different from the first law of motion, when the resisting force at least equals said given value.
- A punch assembly as claimed in Claim 1, wherein the thrust means (25) selectively generate on said second portion (19), during said down stroke, a first and a second thrust to move the second portion (19) axially with said first and said second law of motion respectively; said first and said second thrust being less than and greater than said given value respectively.
- A punch assembly as claimed in Claim 1 or 2, wherein the thrust means (25) are hydraulic thrust means comprising a first and a second variable-volume chamber (24, 21) interposed between said first and said second portion (9, 19); and a hydraulic circuit (25) for selectively feeding a pressurized fluid to the first and second chamber (24, 21); the second chamber (21) having a larger cross section than the first chamber (24).
- A punch assembly as claimed in Claim 3, wherein the hydraulic circuit (25) comprises a first circuit portion (26) hydraulically connecting said first and said second chamber (24, 21); and first valve means (27) located along the first circuit portion (26) to selectively control flow of the pressurized fluid between said first and said second chamber (24, 21).
- A punch assembly as claimed in Claim 4, wherein the first valve means (27) comprise a first valve (28), which is normally set to a first closed position to prevent flow of the pressurized fluid from the first (24) to the second (21) chamber, and is movable, in the presence of a resisting force value at least equal to said given value, from the first closed position to a first open position to permit flow of the pressurized fluid from the first (24) to the second (21) chamber during said down stroke.
- A punch assembly as claimed in Claim 5, wherein said first valve means (27) also comprise a second valve (31) mounted parallel with said first valve (28) to permit flow of the pressurized fluid from the second (21) to the first (24) chamber during said return stroke, when the resisting force is at least equal to said given value.
- A punch assembly as claimed in any one of Claims 3 to 6, wherein said hydraulic circuit (25) comprises a tank (32) for the pressurized fluid; a second circuit portion (33) hydraulically connecting the second chamber (21) and the tank (32); and second valve means (34, 35, 36) located along the second circuit portion (33) to selectively control flow of the pressurized fluid between the second chamber (21) and the tank (32).
- A punch assembly as claimed in Claim 7, wherein the second valve means (34, 35, 36) comprise a third valve (37), which is normally set to a second closed position to prevent flow of the pressurized fluid from the second chamber (21) to the tank (32), and is movable, during said return stroke, from the second closed position to a second open position to permit flow of the pressurized fluid from the second chamber (21) to the tank (32).
- A punch assembly as claimed in Claim 8, wherein the second valve means (34, 35, 36) also comprise a fourth valve (40) mounted parallel with the third valve (37) to permit flow of the pressurized fluid from the tank (32) to the second chamber (21) during said down stroke.
- A punch assembly as claimed in Claim 8 or 9, wherein the second valve means (34, 35, 36) also comprise a fifth valve (41) for selectively controlling movement of the third valve (37) from the second closed position to the second open position.
- A punch assembly as claimed in Claim 10, wherein the fifth valve (41) is mounted between the second chamber (21) and said third and fourth valve (37, 40).
- A punch assembly as claimed in Claim 10 or 11, and also comprising further actuating means for moving the fifth valve (41) between a third closed position, in which the fifth valve (41) prevents flow of the pressurized fluid to the third valve (37), and a third open position, in which the fifth valve (41) permits flow of the pressurized fluid to the third valve (37).
- A punch assembly as claimed in any one of the foregoing Claims, wherein said actuating means (8) comprise an electric motor (13) having an output shaft (14), and a drive (16) from the output shaft (14) to said first portion (9); the drive (16) comprising a screw-nut screw coupling.
- A method of punching at least one metal sheet by means of a ram (6), which is moved along a longitudinal axis (3) in a straight reciprocating movement comprising a down stroke to punch the metal sheet, and a return stroke, and comprises a first portion (9), which is moved axially with a given first law of motion during the down stroke and the return stroke, and a second portion (19) which, in use, engages a punch to punch the metal sheet; the method being characterized in that, during said down stroke, the second portion is moved axially substantially with said first law of motion, when the metal sheet produces a resisting force below a given value, and with a second law of motion, different from the first law of motion, when the metal sheet produces a resisting force at least equal to said given value.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO20040291 ITBO20040291A1 (en) | 2004-05-06 | 2004-05-06 | PUNCHING GROUP. |
ITBO20040291 | 2004-05-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1593444A1 true EP1593444A1 (en) | 2005-11-09 |
Family
ID=34939716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05103777A Withdrawn EP1593444A1 (en) | 2004-05-06 | 2005-05-05 | Punch assembly |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1593444A1 (en) |
IT (1) | ITBO20040291A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015042418A (en) * | 2013-07-26 | 2015-03-05 | 株式会社三井ハイテック | Manufacturing device and manufacturing method of thin uneven member |
DE102014214739B3 (en) * | 2014-07-28 | 2015-12-31 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Punching device, method for punching a workpiece and computer program product for carrying out the method |
CN111889561A (en) * | 2019-05-06 | 2020-11-06 | 莱玛特·沃尔特斯有限公司 | Fine blanking system and operation method thereof |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60247495A (en) * | 1984-05-22 | 1985-12-07 | Mitsubishi Electric Corp | Pressure press |
JP2000246366A (en) * | 1999-02-25 | 2000-09-12 | Amada Co Ltd | Turret punch press |
JP2001150191A (en) * | 1999-11-26 | 2001-06-05 | Hoden Seimitsu Kako Kenkyusho Ltd | Pressurizing device |
-
2004
- 2004-05-06 IT ITBO20040291 patent/ITBO20040291A1/en unknown
-
2005
- 2005-05-05 EP EP05103777A patent/EP1593444A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60247495A (en) * | 1984-05-22 | 1985-12-07 | Mitsubishi Electric Corp | Pressure press |
JP2000246366A (en) * | 1999-02-25 | 2000-09-12 | Amada Co Ltd | Turret punch press |
JP2001150191A (en) * | 1999-11-26 | 2001-06-05 | Hoden Seimitsu Kako Kenkyusho Ltd | Pressurizing device |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 010, no. 118 (M - 475) 2 May 1986 (1986-05-02) * |
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 12 3 January 2001 (2001-01-03) * |
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 23 10 February 2001 (2001-02-10) * |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015042418A (en) * | 2013-07-26 | 2015-03-05 | 株式会社三井ハイテック | Manufacturing device and manufacturing method of thin uneven member |
DE102014214739B3 (en) * | 2014-07-28 | 2015-12-31 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Punching device, method for punching a workpiece and computer program product for carrying out the method |
WO2016016102A1 (en) * | 2014-07-28 | 2016-02-04 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Punching device and method for punching a workpiece |
CN106536081A (en) * | 2014-07-28 | 2017-03-22 | 通快机床两合公司 | Punching device and method for punching workpiece |
CN106536081B (en) * | 2014-07-28 | 2019-03-22 | 通快机床两合公司 | Stamping device and method for stamped workpieces |
US10328478B2 (en) | 2014-07-28 | 2019-06-25 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Punching a workpiece |
CN111889561A (en) * | 2019-05-06 | 2020-11-06 | 莱玛特·沃尔特斯有限公司 | Fine blanking system and operation method thereof |
EP3736061A1 (en) * | 2019-05-06 | 2020-11-11 | Lapmaster Wolters GmbH | Fine blanking system and method for operating the same |
US11779988B2 (en) | 2019-05-06 | 2023-10-10 | Lapmaster Wolters Gmbh | Fine blanking system and method of operating |
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