EP0048776B1 - Präzisions-Schmiedepresse - Google Patents

Präzisions-Schmiedepresse Download PDF

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Publication number
EP0048776B1
EP0048776B1 EP80303412A EP80303412A EP0048776B1 EP 0048776 B1 EP0048776 B1 EP 0048776B1 EP 80303412 A EP80303412 A EP 80303412A EP 80303412 A EP80303412 A EP 80303412A EP 0048776 B1 EP0048776 B1 EP 0048776B1
Authority
EP
European Patent Office
Prior art keywords
punch
reference voltage
ram
punches
forging press
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
Application number
EP80303412A
Other languages
English (en)
French (fr)
Other versions
EP0048776A1 (de
Inventor
Yuki Kushibe
Hisao Kishigami
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to EP80303412A priority Critical patent/EP0048776B1/de
Priority to DE8080303412T priority patent/DE3065700D1/de
Publication of EP0048776A1 publication Critical patent/EP0048776A1/de
Application granted granted Critical
Publication of EP0048776B1 publication Critical patent/EP0048776B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/10—Drives for forging presses
    • B21J9/20—Control devices specially adapted to forging presses not restricted to one of the preceding subgroups
    • 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
    • B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram

Definitions

  • the present invention relates to improvements in precision forging presses.
  • a conventional forging press is known from DD-A 124279 in which there is disclosed means (2 to 5, 15 and 10) for converting positional information relating to a punch into a voltage (14), a reference voltage generator (11) for setting a reference voltage (13), comparator means (5) for comparing the converted voltage with the reference voltage, and control means (7 and 8) for controlling a valve (9) of the drive means for the punch in accordance with comparison results from the comparator means.
  • An object of the present invention is to provide a novel precision forging press which starts from such a conventional press, and in which the positions of the punches can be controlled continuously as desired during deformation of a workpiece.
  • a forging press of the kind discussed above in relation to DD-A-1242 79 which is characterised in that said press is precision forging press comprising a plurality of punches adapted to be driven by said drive means, and in that said reference voltage generator is a programmed generator comprising a template having a programmed profile for each punch, a follower associated with a respective profile of said template, and a potentiometer associated with each follower adapted to be rotated in response to movement of its follower to generate the reference voltage for its respective punch.
  • the press comprises an upper die 1 and a lower die 2, which define a forging space in which a workpiece 3 of raw material can be accommodated.
  • An upper punch 4 and a lower punch 5 are associated with respective upper and lower dies, the upper punch being connected to a main ram 6.
  • the upper and lower punches 4 and 5 slidably project through the upper and lower dies 1 and 2 respectively, into the forging space upon actuation of an upper auxiliary ram 7 and a lower auxiliary ram 8.
  • To the bottom of the main ram 6 is mounted an upper bolster 9 to which the upper die 1 is fixed.
  • a lower bolster 10 is provided to which the lower die 2 is fixed, the lower bolster 10 being mounted on a machine frame 11.
  • Hydraulic circuits are provided for the upper auxiliary ram 7, lower auxiliary ram 8 and main ram 6, respectively, said circuits including pressure regulation valves 12a, 12b and 12c, switching valves 13a, 13b and 13c, hydraulic pumps 14a, 14b and 14c and flow rate regulation valves 15a and 15b.
  • the switching valve 13c is actuated to introduce pressurized oil into the upper chamber of the main ram 6 by the action of the hydraulic pump 14c, and thereby the main ram 6 is lowered to close the dies 1 and 2 together.
  • the upper and lower punches 4 and 5 are set in motion to press into the dies 1 and 2 by the actuation of the upper and lower auxiliary rams 7 and 8, respectively, and thus the forging of the workpiece 3 of raw material is started.
  • the press comprises an upper die 1, and a lower die 2 defining a forging space for a workpiece 3, an upper punch 4, a lower punch 5, a main ram 6, upper and lower auxiliary rams 7, 8 respectively, upper and lower bolsters 9 and 10 respectively, a machine frame 11 and hydraulic circuits including pressure regulation valves 12a, 12b and 12c, a switching valve 13c and hydraulic pumps 14a, 14b and 14c.
  • the above- referred to components are identical to those included in the prior art press shown in Figure 1.
  • the press has a mount table 16 for a potentiometer 176 provided on the machine frame 11, a mount table 18 for a potentiometer 17a provided on the upper bolster 9, and racks 19a and 19b mounted on the upper and lower auxiliary ram 7, 8 respectively, which racks are meshed with pinions 20a and 20b respectively, mounted on the ends of the shafts of the potentiometers 17a and 17b.
  • the control circuit for the press includes amplifiers 21a and 21b, electromagnetically operable servo valves 22a and 22b, which are included in the hydraulic circuits for the upper and lower auxiliary rams 7 and 8, respectively, and a template 24 that is movable along an arrowed dash-dot line C--C and whose profile is designed according to a programme for the positional control of the punches 4 and 5.
  • Reference numerals 25a and 25b designate potentiometers which are associated, at their shaft ends, with pinions 26a and 26b meshed with racks 27a and 27b respectively.
  • each rack 27a and 27b has a roller 28a and 28b respectively serving as a cam follower, the other end of each rack being slidably supported by a rack guide 29a, 29b respectively.
  • the racks 27a and 27b are adapted to be urged against opposite, inclined side surfaces of the template 24 via their rollers 28a and 28b, respectively, by suitable resilient means not shown.
  • the potentiometer 17a which generates a voltage corresponding to the position of the upper auxiliary ram 7, can represent the extent of insertion of the upper punch 4 into the forging space defined by the dies 1 and 2.
  • the voltage generated by the potentiometer 17b indicates the extent of insertion of the lower punch 5 into the space formed by the dies 1 and 2.
  • the voltages generated by the potentiometers 1 7a and 17b respectively, are compared in comparator circuits X i and X 2 with programmed reference voltages generated by a programmed reference voltage generator 23 consisting of the above-described template 24, potentiometers 25a and 25b, pinions 26a and 26b, racks 27a and 27b, rollers 28a and 28b and rack guides 29a and 29b, and the difference signals issued from the comparator circuits X, and X 2 are amplified by the amplifiers 21a a and 21b and then applied to the signal inputs of the servo valves 22a and 22b, respectively.
  • the servo valves 22a and 22b are actuated to drive the upper auxiliary ram 7 and the lower auxiliary ram 8 by means of the respective hydraulic pressure sources 12a-14a and 12b-14b so that the difference between the programmed reference voltages and the voltages generated by the potentiometers 17a and 17b may be nulled. Accordingly, the positions of the upper and lower punches 4 and 5 can be continuously controlled in accordance with the programmed reference voltages issued from the programmed reference voltage generator 23.
  • the successive reference voltages corresponding to the desired positions of the upper and lower punches 4 and 5 are generated in accordance with the profile of the template 24. Therefore, if the profile of the template 24 is appropriately designed from the position for start of a forging operation up to the position for termination of the forging operation, and if the template 24 is moved in the direction of arrow D in Figure 4 during the forging operation from the forging start position up to the forging termination position, then it becomes possible to control continuously the positions of the upper and lower punches 4 and 5 during the entire forging process.
  • the movements or positions of the punches can be continuously controlled during the forging process from the forging start position up to the forging termination position, the mode of deformation flow of the workpiece is always kept constant, and as a result, excellent forged products having good quality and high precision in dimensions can be obtained.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Claims (3)

1. Schmiedepresse mit Mitteln zum Umwandeln von Positionsangaben, die sich auf einen Stempel (4, 5) beziehen, in eine Spannung, mit einem Bezugsspannungsgenerator (23) zum Einstellen einer Bezugsspannung, mit einem Komparator (X,) zum Vergleichen der genannten umgewandelten Spannung mit der genannten Bezugsspannung, und mit Regeleinrichtungen (21a, 21 b, 22a, 22b) zum Regeln eines Antriebes (6-8) des Stempels entsprechend dem Vergleichsergebnis aus dem Komparator, dadurch gekennzeichnet, daß die Presse eine Präzisionsschmiedepresse ist, mit einer Mehrzahl von Preßstempeln (4, 5), die derart gestaltet und angeordnet sind, daß sie mittels des genannten Antriebes (6-8) angetrieben werden, daß der Bezugsspannungsgenerator (23) ein programmierter Generator mit einer Schablone (24) ist, die ein programmiertes Profil für jeden Stempel aufweist, mit einem jeden Profil der genannten Schablone zugeordneten Abtastern (28a, 28b), und einem Potentiometer (25a, 25b), der einen jeden Abtaster zugeordnet ist und der derart gestaltet und angeordnet ist, daß er in Abhängigkeit der Bewegung seines Abtasters umläuft, um die Bezugsspannung für seinen zugeordneten Stempel zu erzeugen.
2. Präzisionsschmiedepresse nach Anspruch 1, mit zwei einander gegenüberliegenden Preßstempeln (4 und 5), wobei der Antrieb für die Stempel eine hydraulische Ramme (6) aufweist, die einen Preßkolben (7 und 8) für jeden Preßstempel umfaßt und von einer hydraulischen Druckquelle gespeist ist, dadurch gekennzeichnet, daß die genannte Regeleinrichtung aus einem Verstärker (21 a, 21 b) und einem Servo-Ventil (22a, 22b) für jeden Preßkolben besteht und zwischen dem betreffenden Preßkolben und die genannte hydraulische Druckquelle geschaltet ist.
3. Präzisionsschmiedepresse nach Anspruch 2, dadurch gekennzeichnet, daß die Verschiebung der Position eines jeden Preßstempels (6 und 7) durch mechanische Mittel einem entsprechenden Potentiometer (17a, 17b) (beispielsweise über Zahnstange und Ritzel) zum Zwecke der Umwandlung in eine Spannung eingespeist wird, die zusammen mit der betreffenden Bezungsspannung dem genannten Komparator (X, und XZ) eingespeist wird, um ein Differenzsignal zu erzeugen, das dem Verstärker (21 a oder 21b) des betreffenden Preßstempel-Servo-Ventils (22a oder 22b) eingespeist wird.
EP80303412A 1980-09-29 1980-09-29 Präzisions-Schmiedepresse Expired EP0048776B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP80303412A EP0048776B1 (de) 1980-09-29 1980-09-29 Präzisions-Schmiedepresse
DE8080303412T DE3065700D1 (en) 1980-09-29 1980-09-29 Precision forging press

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80303412A EP0048776B1 (de) 1980-09-29 1980-09-29 Präzisions-Schmiedepresse

Publications (2)

Publication Number Publication Date
EP0048776A1 EP0048776A1 (de) 1982-04-07
EP0048776B1 true EP0048776B1 (de) 1983-11-23

Family

ID=8187265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80303412A Expired EP0048776B1 (de) 1980-09-29 1980-09-29 Präzisions-Schmiedepresse

Country Status (2)

Country Link
EP (1) EP0048776B1 (de)
DE (1) DE3065700D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570020B1 (fr) * 1984-09-11 1988-07-22 Commissariat Energie Atomique Presse automatique
DE3803632A1 (de) * 1988-02-06 1989-08-17 Eumuco Ag Fuer Maschinenbau Mehr-stoessel-schmiedemaschine
CN102189210B (zh) * 2011-05-16 2013-03-13 沈阳三重机械有限公司 锻件自动对中装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB843394A (en) * 1956-09-29 1960-08-04 Loewy Eng Co Ltd Remote positional control for hydraulic presses
GB857485A (en) * 1958-05-12 1960-12-29 Schloemann Ag Improvements in the control of hydraulic forging presses
DE1234487B (de) * 1961-08-10 1967-02-16 Schloemann Ag Steuerung von Freiformschmiedepressen
DE1427298B1 (de) * 1960-08-31 1970-01-22 British Iron Steel Research Anzeigevorrichtung fuer eine hydraulische Freiformschmiedepresse
DE1763002B2 (de) * 1968-03-20 1972-08-17 Langenstein & Schemann Ag, 8630 Coburg Kapazitiver geber eines gegenueber dem gestell eines hammers oder einer presse bewegbaren baeren
DD124279A1 (de) * 1975-12-23 1977-02-16

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH617368A5 (en) * 1977-05-06 1980-05-30 Supervis Ets Method for the production of a workpiece by extrusion, application of the method and an apparatus for carrying out the method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB843394A (en) * 1956-09-29 1960-08-04 Loewy Eng Co Ltd Remote positional control for hydraulic presses
GB857485A (en) * 1958-05-12 1960-12-29 Schloemann Ag Improvements in the control of hydraulic forging presses
DE1427298B1 (de) * 1960-08-31 1970-01-22 British Iron Steel Research Anzeigevorrichtung fuer eine hydraulische Freiformschmiedepresse
DE1234487B (de) * 1961-08-10 1967-02-16 Schloemann Ag Steuerung von Freiformschmiedepressen
DE1763002B2 (de) * 1968-03-20 1972-08-17 Langenstein & Schemann Ag, 8630 Coburg Kapazitiver geber eines gegenueber dem gestell eines hammers oder einer presse bewegbaren baeren
DD124279A1 (de) * 1975-12-23 1977-02-16

Also Published As

Publication number Publication date
EP0048776A1 (de) 1982-04-07
DE3065700D1 (en) 1983-12-29

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