EP0381089A2 - Presse hydraulique - Google Patents

Presse hydraulique Download PDF

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Publication number
EP0381089A2
EP0381089A2 EP90101652A EP90101652A EP0381089A2 EP 0381089 A2 EP0381089 A2 EP 0381089A2 EP 90101652 A EP90101652 A EP 90101652A EP 90101652 A EP90101652 A EP 90101652A EP 0381089 A2 EP0381089 A2 EP 0381089A2
Authority
EP
European Patent Office
Prior art keywords
press
pressing
die
plungers
plunger
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.)
Granted
Application number
EP90101652A
Other languages
German (de)
English (en)
Other versions
EP0381089A3 (fr
EP0381089B1 (fr
Inventor
Gottfried Weber
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 Lauffer GmbH and Co KG
Original Assignee
Maschinenfabrik Lauffer GmbH and Co KG
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 Maschinenfabrik Lauffer GmbH and Co KG filed Critical Maschinenfabrik Lauffer GmbH and Co KG
Priority to AT90101652T priority Critical patent/ATE103537T1/de
Publication of EP0381089A2 publication Critical patent/EP0381089A2/fr
Publication of EP0381089A3 publication Critical patent/EP0381089A3/fr
Application granted granted Critical
Publication of EP0381089B1 publication Critical patent/EP0381089B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space

Definitions

  • the invention relates to a hydraulic press according to the preamble of the main claim and a method for pressing and compacting pressed parts made of fine-grained materials.
  • Hydraulic presses are known in which press parts consisting of fine-grained materials are pressed between an upper and a lower pressure piece.
  • the workpieces resulting from the resulting shaping are sintered in a subsequent process, agglomerates being formed as a result of surface melting and caking or as a result of the fusion processes.
  • the conventional manufacturing methods for shaping powder compaction are "ejecting", “pulling off” and "counter-pressing".
  • a press for the production of powder compacts is known.
  • This includes an adapter system that has a fixed base position to a basic press fixed table.
  • a press train with a fixed cover only allows one of the named powder-pressing process methods, with the press mentioned being the method of stripping.
  • the upper punch acting on the pressed part from above is moved downward, while the die comprising the pressed part and the lower punch on which the pressed part rests are in a stationary position.
  • the upper punch and the lower punch are then moved upwards, while the die is still in a resting position. The powder-compacted pressed part is thereby exposed.
  • both the upper punch and the die comprising the pressed part are moved downward during the compression process.
  • the lower stamp remains in a resting position.
  • the upper punch moves upwards, while the lower punch remains in a fixed position.
  • the compacted pressed part is then exposed by a further downward movement of the die.
  • the upper punch moves downward during the compression process, while the lower punch moves upward.
  • the die surrounding the powder material to be compacted remains in a resting position.
  • the die also remains in this resting position during the process of exposing the press piece, while the upper punch and the lower punch move upward and the press piece is thus guided out of the die through the lower punch.
  • the pressing method described in the first place proves to be inflexible, since it is only suitable for pressing single-stage parts.
  • the unfavorable density profile that occurs with this also leads to increased crack formation, which can occur in the form of slate cracks or exposure cracks.
  • the pressing method described in the second place is characterized by high maintenance costs and high demands on the operation.
  • the press system is often unstable, which causes the risk of slate.
  • the invention is therefore based on the object of providing a hydraulic press for compacting fine-grained substances which enables the combination of the motion sequences of the three different pressing methods both as a single step and as an overarching production sequence.
  • the pressure pistons which are controlled and monitored by a computer-aided numerical path control, have a very favorable tool design.
  • the shapes of the pressed parts to be pressed can be varied as desired without requiring multiple pressing processes or having to replace the tools used. Since the press rams are characterized by a short tool structure, they have high tool stability, which also increases the stability of the overall system.
  • the plunger 1 to 5 can be seen, between which a press part 6 consisting of fine-grained materials is pressed and compressed.
  • the plungers 1 and 2 act as a cooperating composite plunger from above and the plungers 3 and 4 as a composite plunger from below on the pressing part 6.
  • the plungers 5 act as synchronous plungers on the die table 8 shown in FIG. 2.
  • An adapter 7 for the purpose of a tool assembly with coupling and handling function, as well as the tools of the plunger 1 to 5 can be inserted into the press as a complete package. With regard to the further pressing movements, however, further pressing functions from the adapter are not necessary.
  • FIG. 2 shows the die table 8 and the die holder 9 with the die 10 located thereon.
  • the die holder 9 can be inserted into the press with the complete tooling.
  • the coupling connection between the plungers 1 to 5 can be made as a straight coupling or via a bayonet system by means of a 90 ° rotation. The position is assigned and the transport is secured using an auxiliary bracket that is removed after the coupling.
  • the press Pistons 3 and 4 guided lower punches 11 to 13 are unclamped and are positioned or guided over the die 10.
  • the upper punches 14 and 15 are clamped or oriented using a special guide.
  • a core punch 16 held by a friction lock is brought into position after coupling from below via an auxiliary axis 17 or subsequently placed and fastened via a screw connection.
  • the plungers 1 to 5 work within the press as a free-floating tool system that is clamped and moved by the oil columns of the five plungers 1 to 5.
  • a divided matrix By dividing the matrix table 8 into an upper and a lower half, with connection to 2 plungers for each table half, a divided matrix can be used. By inserting a split die, undercuts can be made on the pressed part.
  • FIG. 3 shows the pressing tools 11 to 15 and the pressing part 6 pressed between them.
  • the movement sequence of the press rams shown in FIG. 4 during the composite pressing shows the stage of filling the metal powder under position I, the pressing process itself under position II and the exposure of the pressed part under position III.
  • the upper punch 1a moves downward in the direction of the arrow, while the die 2a remains stationary.
  • the lower punch 3a moves upwards from the position I given during the filling process, as can be seen in position II.
  • both the upper punch 1a and the lower punch 3a remain in a resting position while the die 2a, as can be seen from position III, is moved downward in the direction of the arrow.
  • the Press part 6 is exposed during this process.
  • the die 2a can also be moved in both directions during the counter-pressing. This circumstance can be used to deliberately underpressure or overpressure.
  • FIG. 5 shows a possible form of a compacted pressed part.
  • Such molded parts can be compressed by a pressing process without the use of an adapter or multiple pressing processes.
  • the different shapes of the pressed parts are made possible by the differently positioned press dies, which can be moved at different speeds, the individual press dies being controlled by a computer-aided numerical path control and additionally being monitored for pressure.
  • displacement sensors 61 to 65 can be seen, which work as displacement measuring systems.
  • the path control takes place via a computer-aided numerical path control for machine tools.
  • Displacement sensor 61 measures the relative movement of plunger 1 to the press stand (press housing) P
  • displacement sensor 62 measures the relative movement of plunger 1 to plunger 2.
  • Displacement sensor 63 measures the relative movement of plunger 3 to press stand P in the lower area of the press according to the invention, while displacement sensor 64 measures the relative movement between plunger 3 and 4.
  • Displacement sensor 65 decreases the relative movement between press stand P and die table 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Press Drives And Press Lines (AREA)
EP90101652A 1989-02-02 1990-01-27 Presse hydraulique Expired - Lifetime EP0381089B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90101652T ATE103537T1 (de) 1989-02-02 1990-01-27 Hydraulische presse.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3903052 1989-02-02
DE3903052 1989-02-02
DE3940192A DE3940192A1 (de) 1989-02-02 1989-12-05 Hydraulische presse
DE3940192 1989-12-05

Publications (3)

Publication Number Publication Date
EP0381089A2 true EP0381089A2 (fr) 1990-08-08
EP0381089A3 EP0381089A3 (fr) 1991-05-15
EP0381089B1 EP0381089B1 (fr) 1994-03-30

Family

ID=25877351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101652A Expired - Lifetime EP0381089B1 (fr) 1989-02-02 1990-01-27 Presse hydraulique

Country Status (2)

Country Link
EP (1) EP0381089B1 (fr)
DE (2) DE3940192A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4203401A1 (de) * 1991-05-02 1992-11-12 Yoshizuka Seiki Co Verfahren und vorrichtung zum steuern einer pulverformpresse
EP0516222A2 (fr) * 1991-05-27 1992-12-02 Metallwerk Plansee Gesellschaft Mbh Panneau adaptateur avec dispositives de formage à outil oscillant pour une presse axiale

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4331017C2 (de) * 1993-09-13 1999-09-23 Langenstein & Schemann Gmbh Verfahren zum Steuern einer Presse für Steinformlinge
DE102009042603A1 (de) * 2009-09-23 2011-03-24 Gkn Sinter Metals Holding Gmbh Verfahren zur Herstellung eines Verbundbauteils
DE102009042598A1 (de) * 2009-09-23 2011-03-24 Gkn Sinter Metals Holding Gmbh Verfahren zur Herstellung eines Grünlings

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509783A (en) * 1945-10-17 1950-05-30 Hpm Dev Corp Apparatus for molding
US2562876A (en) * 1945-11-17 1951-08-07 Hpm Dev Corp Apparatus for molding flanged workpieces
DE2041923A1 (de) * 1969-08-29 1971-03-11 Parker Hannifin Corp Hydraulische Presse
FR2074867A5 (fr) * 1970-01-19 1971-10-08 Pennwalt Corp
US3868201A (en) * 1973-04-17 1975-02-25 Wickes Corp Powdered metal press
GB2025834A (en) * 1978-07-24 1980-01-30 Merisinter Spa Powder compaction press
DE3142126A1 (de) * 1981-10-23 1983-05-11 Dorst-Keramikmaschinen-Bau Otto Dorst U. Dipl.-Ing. Walter Schlegel, 8113 Kochel "presse zum herstellen masshaltiger presslinge aus pulverfoermigem material"
EP0289638A1 (fr) * 1987-05-07 1988-11-09 Gräbener Pressensysteme GmbH & Co. KG Presse, notamment pour fabriquer des articles pressés à dimensions exactes à partir de matières pulvérulentes, et procédé pour l'opération d'une telle presse

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT992997B (it) * 1973-08-17 1975-09-30 Bettonica L Pressa idraulica per la fabbrica zione di piastrelle e piatti di materiale ceramico e simili

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509783A (en) * 1945-10-17 1950-05-30 Hpm Dev Corp Apparatus for molding
US2562876A (en) * 1945-11-17 1951-08-07 Hpm Dev Corp Apparatus for molding flanged workpieces
DE2041923A1 (de) * 1969-08-29 1971-03-11 Parker Hannifin Corp Hydraulische Presse
FR2074867A5 (fr) * 1970-01-19 1971-10-08 Pennwalt Corp
US3868201A (en) * 1973-04-17 1975-02-25 Wickes Corp Powdered metal press
GB2025834A (en) * 1978-07-24 1980-01-30 Merisinter Spa Powder compaction press
DE3142126A1 (de) * 1981-10-23 1983-05-11 Dorst-Keramikmaschinen-Bau Otto Dorst U. Dipl.-Ing. Walter Schlegel, 8113 Kochel "presse zum herstellen masshaltiger presslinge aus pulverfoermigem material"
EP0289638A1 (fr) * 1987-05-07 1988-11-09 Gräbener Pressensysteme GmbH & Co. KG Presse, notamment pour fabriquer des articles pressés à dimensions exactes à partir de matières pulvérulentes, et procédé pour l'opération d'une telle presse

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4203401A1 (de) * 1991-05-02 1992-11-12 Yoshizuka Seiki Co Verfahren und vorrichtung zum steuern einer pulverformpresse
EP0516222A2 (fr) * 1991-05-27 1992-12-02 Metallwerk Plansee Gesellschaft Mbh Panneau adaptateur avec dispositives de formage à outil oscillant pour une presse axiale
EP0516222A3 (en) * 1991-05-27 1993-03-31 Metallwerk Plansee Gesellschaft Mbh Adaptor plate with mechanism for wobble-pressing for an axial press

Also Published As

Publication number Publication date
EP0381089A3 (fr) 1991-05-15
DE3940192A1 (de) 1990-08-09
DE59005145D1 (de) 1994-05-05
EP0381089B1 (fr) 1994-03-30

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