EP0401534B1 - Hydraulische Zieheinrichtung im Pressentisch einer einfach- oder doppeltwirkenden Presse - Google Patents

Hydraulische Zieheinrichtung im Pressentisch einer einfach- oder doppeltwirkenden Presse Download PDF

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Publication number
EP0401534B1
EP0401534B1 EP90108771A EP90108771A EP0401534B1 EP 0401534 B1 EP0401534 B1 EP 0401534B1 EP 90108771 A EP90108771 A EP 90108771A EP 90108771 A EP90108771 A EP 90108771A EP 0401534 B1 EP0401534 B1 EP 0401534B1
Authority
EP
European Patent Office
Prior art keywords
pressure
bearers
bearer
drawing device
hydraulic cylinders
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
Application number
EP90108771A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0401534A1 (de
Inventor
Erich Harsch
Gebhard Engler
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.)
Maschinenfabrik Mueller Weingarten AG
Original Assignee
Maschinenfabrik Mueller Weingarten AG
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
Priority claimed from DE19893915794 external-priority patent/DE3915794A1/de
Application filed by Maschinenfabrik Mueller Weingarten AG filed Critical Maschinenfabrik Mueller Weingarten AG
Publication of EP0401534A1 publication Critical patent/EP0401534A1/de
Application granted granted Critical
Publication of EP0401534B1 publication Critical patent/EP0401534B1/de
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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/02—Die-cushions
    • 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 hydraulic pulling device in the press table of a single- or double-acting press according to the preamble of claim 1.
  • the workpiece is raised to the level of the transport plane either by means of a separate lifting cylinder or by means of the pressure cylinders arranged in the companionway for holding or holding the workpiece. This lifting movement occurs either by directly following the pulling device on the plunger or delayed for the plunger run-up.
  • FIGS. 1a, 1b The exemplary embodiment according to FIGS. 1a, 1b is first described below:
  • a lower tool part 3 with sheet holder 4 and pressure pin 8 is placed on the sliding table 2 mounted on the press table 1.
  • the pulling device is raised to the parts transport level.
  • the upper tool part 6 is attached to the ram 7 of the press.
  • the pressure cylinder 10 or its pressure source are out of function and the pressure cheeks 9 are lowered as far as possible against the pressure cylinder 10.
  • the exact upper position of the pressure cheeks 9 is achieved by the adjusting device, consisting of housing 33, worm wheel 22, worm 21 and threaded spindle 20 in connection with a geared brake motor and angle encoder.
  • the device with the lifting cylinder 19, depending on the choice, is brought back into the transport position, depending on the ram, or, depending on the number of strokes of the press and thus the run-up speed, about 20 to 80 mm before the upper end position by a proportional valve is braked with a displacement sensor and driven to a stop at reduced speed.
  • the four pressure cylinders 16 are moved upwards with reduced pressure following the pressure cheek 11 and are therefore also braked approximately 20 to 80 mm before the upper end position.
  • Fig. 1b two lower tool parts 3 with sheet metal holder 4 and pressure pin 8 are placed on the sliding table 2.
  • the pulling device is raised at the transport level.
  • the two upper tool parts 6 are attached to the ram 7 of the press.
  • the pistons of the pressure cylinder 10 have moved into their upper end position.
  • the exact upper position of the pressure cheeks 9, 9 ' is in turn achieved by the adjusting device consisting of housing 33, worm wheel 22, worm 21 and threaded spindle 20 in connection with a geared brake motor and encoder.
  • the pressure setpoint is increased to the desired value for the drawing process; after an immersion depth of approximately 20 mm, the position control of the proportional valves also begins.
  • a lower tool part 3 with a sheet metal holder 4 and pressure pin 8 is placed on the sliding table 2 mounted on the press table 1; the pulling device is raised to the parts transport level.
  • the upper tool part 6 is attached to the ram 7 of the press.
  • the exact upper position of the pressure cheeks 9 is achieved by the adjusting nuts 25.
  • the adjusting devices consisting of housing 33, worm wheel 22, worm 21 and threaded spindle 20 in connection with servomotors, are driven onto the stops on the piston rods 15, 18; the pressure box 11 lies here with the upper stops on the pressure cheeks 9, 9 '.
  • the piston rods of the internal pressure cylinders 16 are lowered by actuation by means of proportional valves 35 and closing of valves 45 and are out of function.
  • the counter-holding force is now regulated separately by the targeted metering of the hydraulic oil displaced from the cylinders 16 with the aid of proportional valves 35 in conjunction with pressure transducers 36 for detecting the respective actual values for each of the four external pressure points .
  • the valve 28 of the two lifting cylinders 19 is without tension during the drawing process.
  • the pressure cheeks 9 lie on the pressure box 11 during the entire stroke and thus guarantee an exact parallel support of the pressure bolts 8.
  • the device with the lifting cylinders 19 is activated by actuating the valve 28 and proportional valve 27, depending on the choice, following the plunger or delayed in the parts transport position, depending on the number of strokes of the press and thus the run-up speed of the device approx. 20 to 80 mm before the upper end position is braked with the proportional valve 27 in connection with a displacement transducer and is driven to a stop at a reduced speed.
  • the four outer pressure cylinders 16 are moved upwards by driving the valves 42 with reduced pressure, following the pressure box 11, and thus also braked approx. 20 to 80 mm before the upper end position.
  • the two upper tool parts 6 are attached to the ram 7 of the press.
  • the exact upper position of the pressure cheeks 9 is achieved by the adjusting nut 25.
  • the adjusting devices consisting of the housings 33, the worm wheels 22, the worms 21 and the threaded spindles 20 in connection with servomotors, are retracted as far as they will go; the pressure box 11 rests on the lower stops 12.
  • the directional control valves 45 are activated so that all eight pressure cylinders 16 are in operation.
  • the counter-holding force is in turn increased by the targeted metering of the hydraulic oil displaced from the cylinders 16 with the aid of the proportional valves 35 in conjunction with pressure transducers 36 to record the respective actual values for each of the pressure points and four each regulated separately for each tool.
  • a pre-acceleration of the pulling device can be done by one of the two in the centrally located tool Pre-acceleration cylinder 61 can be reached, for which purpose valve 46 is opened and valve 47 is closed.
  • the four outer pressure cylinders with the connections B1, B2, C1, C2 are combined to form a pre-acceleration unit.
  • a pressure intensifier 83 can be set in motion by actuating valves 82, which acts on the upper cylinder space of the lifting cylinders with hydraulic oil. This accelerates the two pistons of the lifting cylinder downwards. At the same time, oil is displaced from the four outer pressure cylinders, which actuates the pre-acceleration cylinder via connections B1, B2, C1 and C2, which has the same effective area as the pressure cylinders.
  • the speed of the piston 63 and thus the piston rod 15 or the lifting piston 18 can be adapted to the speed of the plunger 7 in connection with distance measuring devices. After about 80 mm of travel of the piston 63, it gradually runs over a bore 64 and is braked before it hits a stop after 100 mm. This 80 mm travel corresponds to a stroke of 20 mm for each of the four printing cylinders.
  • valve 46 can be closed and the valve 47 can be opened, ie a pre-acceleration cylinder is provided for the four pressure cylinders on each side.
  • the functional sequence is the same as for a centrally positioned tool.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Control Of Presses (AREA)
EP90108771A 1989-05-13 1990-05-10 Hydraulische Zieheinrichtung im Pressentisch einer einfach- oder doppeltwirkenden Presse Expired - Lifetime EP0401534B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3915795A DE3915795C1 (it) 1989-05-13 1989-05-13
DE3915795 1989-05-13
DE3915794 1989-05-13
DE19893915794 DE3915794A1 (de) 1989-05-13 1989-05-13 Hydraulische zieheinrichtung im pressentisch einer einfach- und doppeltwirkenden presse

Publications (2)

Publication Number Publication Date
EP0401534A1 EP0401534A1 (de) 1990-12-12
EP0401534B1 true EP0401534B1 (de) 1992-12-02

Family

ID=25880890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90108771A Expired - Lifetime EP0401534B1 (de) 1989-05-13 1990-05-10 Hydraulische Zieheinrichtung im Pressentisch einer einfach- oder doppeltwirkenden Presse

Country Status (3)

Country Link
EP (1) EP0401534B1 (it)
DE (2) DE3915795C1 (it)
ES (1) ES2036072T3 (it)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3919372A1 (de) * 1989-06-14 1990-12-20 Schuler Gmbh L Druckwange im ziehapparat einer presse
DE59101219D1 (de) * 1990-04-23 1994-04-28 Mueller Weingarten Maschf Zieheinrichtung in einer Presse zum Ziehen von Blechformteilen.
IT1254188B (it) * 1991-02-12 1995-09-14 Dispositivo di imbutitura idroelastico
DE4112943A1 (de) * 1991-04-20 1992-10-22 Schuler Gmbh L Zieheinrichtung im pressentisch einer presse
DE4211639A1 (de) * 1992-04-07 1993-10-14 Schuler Gmbh L Hochlaufsteuerung für die Druckwange in einem Ziehapparat
DE19711780A1 (de) * 1997-03-21 1998-09-24 Schuler Pressen Gmbh & Co Zieheinrichtung für Ziehpressen
JP4704047B2 (ja) * 2005-01-14 2011-06-15 株式会社小松製作所 ダイクッション装置
CN109127849A (zh) * 2018-09-28 2019-01-04 南通市腾达锻压机床厂 薄板拉伸液压机的液压垫装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2354003A (en) * 1942-07-15 1944-07-18 Hydraulic Dev Corp Inc Hydraulic press
DE3242705C2 (de) * 1982-11-19 1985-10-31 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Im Pressentisch einer einfach wirkenden Ziehpresse angeordnete Drucklufteinrichtung
DE3406526C2 (de) * 1984-02-23 1987-01-15 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Einfachwirkende Presse mit einem Ziehkissen im Pressentisch und einem Schiebetisch
IT1217320B (it) * 1987-06-30 1990-03-22 Fir Srl Apparato per la imbutitura della lamiera
DE3735581C1 (de) * 1987-10-21 1988-05-11 Daimler Benz Ag Presse zum Ziehen von Blechteilen

Also Published As

Publication number Publication date
EP0401534A1 (de) 1990-12-12
DE3915795C1 (it) 1991-01-31
DE59000532D1 (de) 1993-01-14
ES2036072T3 (es) 1993-05-01

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