EP0713735B1 - Klemmeinrichtung zwischen Ober- und Unterwerkzeug einer Presse - Google Patents
Klemmeinrichtung zwischen Ober- und Unterwerkzeug einer Presse Download PDFInfo
- Publication number
- EP0713735B1 EP0713735B1 EP95117213A EP95117213A EP0713735B1 EP 0713735 B1 EP0713735 B1 EP 0713735B1 EP 95117213 A EP95117213 A EP 95117213A EP 95117213 A EP95117213 A EP 95117213A EP 0713735 B1 EP0713735 B1 EP 0713735B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stroke
- short
- pressure
- clamping arrangement
- cylinder
- 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
Links
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 2
- 230000008859 change Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
- B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically
Definitions
- the invention relates to a Clamping device according to the preamble of claim 1.
- a hydraulic cushion assembly for a press which is intended to apply a cushion force that is uniform for a workpiece across all pressure bolts.
- a plurality of short-stroke cylinders that are fluidly connected to one another and whose short-stroke pistons are operatively connected to the pressure bolts are arranged on a pressure-pin plate that can be moved by the die cushion.
- the short-stroke cylinders are connected to a hydraulic supply device to supply them with pressure medium.
- the hydraulic supply device contains elements for changing an initial pressure in the short-stroke cylinders. This pressure change takes place before the start of the pressing operation.
- the problem underlying the invention is a compensation device to create that with simple technical Averaging ensures that all thrust bolts have the same force transfer the force of the short-stroke cylinder with each other before full adhesion is reached almost excluded between the functional elements and the contact pattern of all pressure bolts achieved in this way is reproducible is.
- the prerequisite for this is that all pressure bolts under Experience the same compression. This in turn does on the condition that geometric deviations of the in Functional elements lying in the power flow can be compensated.
- Push pin points of the push pin plate with short stroke cylinders can be occupied, but expediently only those necessary according to an empirical determination Push pin points within the framework of the standardized grid Short stroke cylinders are occupied. While adjusting the Number and position of the pressure bolts for each tool manually takes place in the known form when changing tools the not necessary but on the push pin plate Existing short stroke cylinders are depressurized and so from communicating system can be disconnected. Likewise can determine the pressure pin points required for the specific tool to be covered with pressure bolts and the ones that still exist Short stroke piston of the unnecessary pressure pin points "blind" continue to operate. Alternatively, you can all existing short stroke cylinders are operated and only the pressure pin points required for the specific tool Pressure bolts are occupied.
- the equipment can also do so be designed so that the individual when changing tools Short stroke cylinders in their assignment to the pressure bolts can be moved or removed and retrofitted. When change the number of pressure bolts and / or geometry deviations of the functional elements is a change in volume of the Compensation room expedient in the compensation cylinder.
- the short stroke cylinders can also be used with different Active areas are formed.
- the press ram 1 with the upper tool of a mechanical or hydraulic press comes into operative connection with the lower tool arranged on the sliding table 2 in a known manner according to FIG. 1.
- the upper and lower tools are not shown. Due to geometrical deviations of the functional elements lying in the power flow during the drawing process, which in total are expressed in terms of the length difference 8, each of the pressure bolts 7 with y 1 to y n , there is no simultaneous contact of all relevant components.
- the pressure pin plate 3 guided in the press table 4 is operatively connected in a known manner to a die cushion arranged on the cross member 19.
- the die cushion piston 18 is acted upon by the die cushion force 23.
- the short-stroke cylinders 5 are arranged on the pressure pin plate 3 and are flow-connected to one another via connecting lines 20.
- a pressure pin 7 can be assigned to each short-stroke piston 6.
- the flow-connected short-stroke cylinders 5 are connected via a connecting line 14 to a compensation chamber 22 of a compensation cylinder 10 which is preferably rigidly arranged on the pressure pin plate 3.
- This connecting line 14 is simultaneously connected via a directional valve 17, to which a pressure relief valve 24 is connected in parallel, to a pressure medium container 16 integrated in the compensation cylinder 10.
- the pressure medium container 16 is operatively connected to a pressure regulating device 15 via a directional valve 21.
- An adjustable stroke limiter 13 is arranged on the piston rod rigidly connected to the compensation piston 11. Before the introduction of force from the press ram 1 via the upper tool into the pressure bolts 7, the short-stroke pistons 6 are in their upper, mechanically limited starting position, into which they are brought and held by spring force.
- the spring can be mechanical or generated by pneumatic pressure.
- the compensation piston 11 is in its mechanical, lower end position. With the first contact between the driving system of press ram 1 with the upper tool and the stationary drawing cushion with the pressure pin plate 3, the drawing cushion piston 18, the short-stroke cylinders 5 and the pressure pin 7, the relevant short-stroke piston 6 is displaced by the displacement stroke 9.
- This displacement stroke 9 is in each case Short stroke cylinder 5 different and designated x 1 to x n .
- all pressure bolts 7 follow until the start of drawing and displace pressure medium via the connecting lines 20 and 14 into the compensation chamber 22 of the compensation cylinder 10.
- the pressure piston is displaced from the short-stroke cylinders 5 and the compensation piston 11 is displaced by the compensation stroke 12
- This compensation stroke 12 and thus the sum of the pressure medium displaced from the short stroke cylinders 5 is determined by the adjustable stroke limiter 13.
- Due to the mechanically limited volume absorption in the compensation cylinder 10, the displacement stroke 9 of the short-stroke piston 6 is interrupted in the drawing direction.
- the pressure bolts are thus driven further against the acting die cushion force 23, which is supported on the press table 4 via the crossmember 19.
- the qualitative position of the functional elements at the start of drawing is shown in FIG. 2.
- the directional control valve 17 is located in the blocking position from the connecting line 14 in the direction of the pressure medium container 16.
- the pressure relief valve 24 is arranged parallel to the directional control valve 17 to protect the hydraulic system against overload.
- the directional valve 17 can also be designed as a continuous valve.
- the pressure medium is returned from the compensation space 22 into the short-stroke cylinders 5, whereby the short-stroke pistons 6 reach their starting position.
- the pressure medium is acted upon by pneumatic pressure via the pressure control device 15 and the directional control valve 21.
- the pressure in the pressure medium container 16 causes a corresponding force through the differential area, which causes the pressure medium to flow back from the compensation chamber 22 guaranteed.
- the pressure pin plate 3 a standardized number of pressure pin points 25.
- the Need these individual pressure pin points 25 per tool is known to be very different.
- the assembly of all or only for one Tool required pressure pin points 25 with short-stroke cylinders 5 is suggested, according to an empirical determined necessary pin assignment for Tools in a certain period of time short-stroke cylinder 5 too operate and only according to the respective tool required pressure pin points 25 with pressure pin 7 equip or those that are not required Push pin points 25 by "depressurizing" the not to put the required short stroke cylinder 5 out of operation.
- the directional control valves 26 and 27 are between the short-stroke cylinders 5 and the pressure medium container 16 arranged and connected in series. They allow that for a Tool not required short stroke cylinder 5 relieved of pressure and thus be put out of operation. If necessary, the Number of short-stroke cylinders 5 adapted for each tool become. For this purpose, the short-stroke cylinders 5 are spatially Arrangement can be changed or removed and retrofitted. At Change in the number of pressure bolts 7 and / or Part geometry or the length difference 8 is one Volume change of the compensation space 22 by means of Stroke limitation 13 expedient.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Presses (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Press Drives And Press Lines (AREA)
- Presses And Accessory Devices Thereof (AREA)
Description
Bei dieser mit hohem technischen Aufwand betriebenen Lösung kommen die im Kraftfluß liegenden Funktionselemente durch im praktischen Pressenbetrieb gegebene verschleiß- und/oder fertigungsbedingte geometrische Abweichungen zu unterschiedlichen Zeitpunkten zur Wirkung. Durch die Federwirkung des Druckmittels entstehen nach dem Kontakt des ersten Druckbolzens bis zur Erreichung gleicher Druckbolzenkräfte Kippkräfte auf das gesamte System Stößel - Werkzeug - Druckbolzenplatte.
- Fig. 1:
- Prinzipdarstellung der Kraftübertragung zwischen Stößel und Ziehkissen einer mechanischen Presse bei Kontaktbeginn mit zusätzlich angegebener Pressenstößelstellung nach Figur 2.
- Fig. 2:
- Prinzipdarstellung der Kraftübertragung zwischen Stößel und Ziehkissen einer mechanischen Presse bei Ziehbeginn mit zusätzlich angegebener Pressenstößelstellung nach Figur 1.
- Fig. 3:
- Draufsicht auf eine Druckbolzenplatte mit Darstellung der Druckbolzenpunkte für verschiedene Werkzeuge
- Fig: 4:
- Schnitt A - A aus Fig. 3
Claims (7)
- Klemmeinrichtung zwischen Ober- und Unterwerkzeug einer Presse zum Erreichen der Blechhaltekraft, mit einer Druckbolzenplatte (3) auf der eine Mehrzahl von untereinander fließverbundenen Kurzhubzylindern (5) angeordnet sind, deren Kurzhubkolben (6) jeweils mit Druckbolzen (7) wirkverbunden sind, wobei diese im Zusammenwirken zwischen Ober- und Unterwerkzeug das umzuformende Blech einspannen können,
dadurch gekennzeichnet,
daß die sich an den, den Druckbolzen (7) abgewandten seiten der Kurzhubkolben (6) befindlichen Druckräume der Kurzhubzylinder (5) mit einem Kompensationszylinder (10) so wirkverbunden sind, daß das vor Ziehbeginn durch Kraftwirkung in den Druckbolzen (7) über den Verdrängerhub (9) in den Kurzhubzylindern (5) verdrängte Druckmittel im Kompensationsraum (22) des Kompensationszylinders (10) aufgenommen wird, und daß der Druck in allen Druckräumen gleich ist. - Klemmeinrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß für jeden entsprechend der verschiedenen Werkzeuge in einer Werkzeugspannplatte vorhandenen Druckbolzenpunkte (25) jeweils ein Kurzhubzylinder (5) auf der Druckbolzenplatte (3) angeordnet sein kann. - Klemmeinrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Kurzhubzylinder (5) in ihrer Anordnung auf der Druckbolzenplatte (3) entsprechend der Werkzeuganforderungen veränderbar sind. - Klemmeinrichtung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß jeder Kurzhubzylinder (5) separat drucklos schaltbar ist. - Klemmeinrichtung nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß das Volumen des Kompensationsraumes (22) und damit der Kompensationshub (12) durch eine verstellbare Hubbegenzung (13) veränderbar ist. - Klemmeinrichtung nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß die Kurzhubzylinder (5) und der Kompensationszylinder (10) im gleichen Bewegungssystem angeordnet sind und keine Relativbewegung zueinander ausführen. - Klemmeinrichtung nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß zur Realisierung "weicher" Druckübergänge bei Ziehbeginn ein als Stetigventil ausgebildetes Wegeventil (17) zwischen der zu den Druckräumen führenden Verbindungsleitung und einem Druckmittelbehälter (16) angeordnet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4441562 | 1994-11-23 | ||
DE4441562A DE4441562A1 (de) | 1994-11-23 | 1994-11-23 | Längenkompensationseinrichtung in einer Klemmeinrichtung zwischen Ober- und Unterwerkzeug einer Presse |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0713735A1 EP0713735A1 (de) | 1996-05-29 |
EP0713735B1 true EP0713735B1 (de) | 1999-01-13 |
Family
ID=6533869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95117213A Expired - Lifetime EP0713735B1 (de) | 1994-11-23 | 1995-11-02 | Klemmeinrichtung zwischen Ober- und Unterwerkzeug einer Presse |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0713735B1 (de) |
DE (2) | DE4441562A1 (de) |
ES (1) | ES2126199T3 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2991608B1 (fr) * | 2012-06-07 | 2014-06-20 | Peugeot Citroen Automobiles Sa | Serre-flan pour presse d'emboutissage comportant un indicateur d'accostage de la chandelle du coussin de presse. |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0173755B1 (de) * | 1984-06-29 | 1989-02-01 | L. SCHULER GmbH | Zieheinrichtung in einer Presse |
DE3735581C1 (de) * | 1987-10-21 | 1988-05-11 | Daimler Benz Ag | Presse zum Ziehen von Blechteilen |
DD298484A5 (de) * | 1990-10-02 | 1992-02-27 | Umformtechnik Erfurt Gmbh,De | Hydraulischer blechhalter fuer einfachwirkende pressen |
CA2077510C (en) * | 1991-09-04 | 1997-01-28 | Kazunari Kirii | Hydraulic cushioning system for press, having shut-off valve for disconnection of pressure-pin cylinders from power supply upon contact of movable die with workpiece |
US5299444A (en) | 1991-09-04 | 1994-04-05 | Toyota Jidosha Kabushiki Kaisha | Hydraulic cushioning system for press, having hydraulic power supply including means for adjusting initial pressure to be applied to pressure-pin cylinders |
JP2722937B2 (ja) * | 1992-04-07 | 1998-03-09 | トヨタ自動車株式会社 | プレス機械のしわ押え荷重測定装置 |
EP0773075B1 (de) * | 1992-11-05 | 2002-05-29 | Toyota Jidosha Kabushiki Kaisha | Verfahren und vorrichtung zur regelung überprüfung oder optimierung des zylinderstiftendrucks einer presse durch flüssigkeits oder anfangsdruckausstoss |
-
1994
- 1994-11-23 DE DE4441562A patent/DE4441562A1/de not_active Withdrawn
-
1995
- 1995-11-02 ES ES95117213T patent/ES2126199T3/es not_active Expired - Lifetime
- 1995-11-02 DE DE59504805T patent/DE59504805D1/de not_active Expired - Lifetime
- 1995-11-02 EP EP95117213A patent/EP0713735B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2126199T3 (es) | 1999-03-16 |
EP0713735A1 (de) | 1996-05-29 |
DE4441562A1 (de) | 1996-05-30 |
DE59504805D1 (de) | 1999-02-25 |
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