EP0281023A2 - Dispositif pour la commande et le dosage du remplissage de moules de presse - Google Patents

Dispositif pour la commande et le dosage du remplissage de moules de presse Download PDF

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Publication number
EP0281023A2
EP0281023A2 EP88102872A EP88102872A EP0281023A2 EP 0281023 A2 EP0281023 A2 EP 0281023A2 EP 88102872 A EP88102872 A EP 88102872A EP 88102872 A EP88102872 A EP 88102872A EP 0281023 A2 EP0281023 A2 EP 0281023A2
Authority
EP
European Patent Office
Prior art keywords
filling
controlled
tool
shoe
filling shoe
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Withdrawn
Application number
EP88102872A
Other languages
German (de)
English (en)
Other versions
EP0281023A3 (fr
Inventor
Wolfgang Schütz
Dietmar Liehr
Dieter Hundt
Jürgen Stoll
Rolf Scheibel
Helmut Klostermann
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.)
Robotron VEB
Original Assignee
Robotron VEB
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 Robotron VEB filed Critical Robotron VEB
Publication of EP0281023A2 publication Critical patent/EP0281023A2/fr
Publication of EP0281023A3 publication Critical patent/EP0281023A3/fr
Withdrawn legal-status Critical Current

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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
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses
    • B30B15/304—Feeding material in particulate or plastic state to moulding presses by using feed frames or shoes with relative movement with regard to the mould or moulds

Definitions

  • the invention relates to a device for the controlled, metered filling of molds with metal powder for the production of high-precision pressed parts, in particular plain bearings made of metal powder.
  • Devices for filling single and multiple tools for pressing sintered moldings, which have a bottom opening corresponding to the filling shoe size, are moved over the tool filling space, fill this with metal powder and strip the metal powder at the tool edge when the filling shoe is moved back.
  • pre-compression occurs unintentionally.
  • Tool parts protruding from below, such as mandrels and punches create a filling shadow that relates to the direction of flow and results in an uneven distribution of the powder.
  • This uneven distribution of the metal powder is expressed disadvantageously in a shape and position deviation in pressed parts.
  • the different mass distribution or powder density also causes a different sinter shrinkage.
  • the fill shadow effect by filling from one direction is overlaid by the effect of the air, which does not escape evenly at all points and in the same direction.
  • zones of different bed ratios arise, which cause differences in density and dimensions when pressing.
  • a device for filling press molds has become known, with which a quantity of powder projecting beyond the mold is displaced radially from the inside to the outside by a rotary movement of a rotating device arranged in the filling shoe.
  • the wiping and thus the filling shadow effect can only be partially avoided by the rotary movement.
  • the device is extremely complicated due to the additional drive for the rotary movement and, due to its construction, only suitable for large parts. With the device, the concentricity of rotary pressed parts can only be improved insignificantly.
  • the invention has for its object to provide a device for the metered filling of metal powder in molds with a filling shoe for producing sintered moldings, which ensures a uniform pre-compression of the metal powder in the mold with a high dimensional and dimensional accuracy of the moldings.
  • the object is achieved in that the filling shoe, which can be moved out of the tool area, is provided with a controllable diaphragm closing device which is only opened via a lever arrangement when the filling shoe is positioned directly above the tool filling space.
  • the filling shoe has a base plate in which a closure device with a fixed and a movable diaphragm part is arranged, which is connected to an axis and an actuating lever, the actuating lever being controlled by means of a cam roller by means of a curve.
  • the shutter is closed again before the filling shoe is moved away, and the flow of metal particles is interrupted.
  • a high degree of shape and position accuracy of the pressed parts is achieved.
  • the possibility of adjusting the shape and position of the diaphragm allows differences resulting from the air flow to be compensated for.
  • the axis has a vent hole which lies above the tool filling space during the filling process.
  • the aperture shape of the closure device can be adapted to the size and shape of the pressed part.
  • the filling shoe 1 has a base plate 2, into which a shutter device is inserted.
  • the shutter device consists of a fixed shutter part 3 and a movable, in particular rotatable, shutter part 4.
  • the movable shutter part 4 is connected to an axis 5, on which an actuating lever 6 is arranged.
  • the shutter device is temporarily controlled via the actuating lever 6 via the thrust roller 15 and the curve 16, ie both the time of opening and closing of the shutter and the opening time of the shutter direction are adjustable and thus controllable.
  • the actuating lever 6 In the closed state of the diaphragm, the actuating lever 6 is held at the stop 8 by means of a tension spring 7, while the opening of the diaphragm is effected by means of the cam 16 via the thrust roller 15.
  • the filling process is adjustable with the curve shape.
  • the curve 16 is selected such that a negative fill shadow is avoided when filling, the opening of the diaphragm part 3 in the area of the tool filling space projecting beyond the edge area 12 of the die 11.
  • the axis 5 is articulated in the concentric area of the mandrel 14.
  • the shape and size of the diaphragm can be varied according to the shape and size of the pressing tool with the die 11 or its tool filling space through special openings in the mechanism described, for. B. vent hole 13, the air displaced during the filling process with the metal powder from the mold filling space can escape. When pressing with the tool stamp, evenly compacted compacts are created for the sintering process (green compacts).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
EP88102872A 1987-03-02 1988-02-26 Dispositif pour la commande et le dosage du remplissage de moules de presse Withdrawn EP0281023A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD30036387A DD265521A3 (de) 1987-03-02 1987-03-02 Vorrichtung zum gesteuerten dosierten fuellen von pressformen mit metallpulver
DD300363 1987-03-02

Publications (2)

Publication Number Publication Date
EP0281023A2 true EP0281023A2 (fr) 1988-09-07
EP0281023A3 EP0281023A3 (fr) 1990-02-14

Family

ID=5587184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88102872A Withdrawn EP0281023A3 (fr) 1987-03-02 1988-02-26 Dispositif pour la commande et le dosage du remplissage de moules de presse

Country Status (2)

Country Link
EP (1) EP0281023A3 (fr)
DD (1) DD265521A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN120680754A (zh) * 2025-08-25 2025-09-23 江苏富强特钢有限公司 一种对金属废料进行回收的压块机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1584833B1 (de) * 1965-01-25 1970-08-06 Ulrico Walchhuetter Presse zum Herstellen von doppelschichtigen Fussbodenplatten,Fliesen od. dgl.
DD132182B1 (de) * 1977-06-29 1980-03-19 Ursula Eisel Einfuellvorrichtung fuer formen zum herstellen von betonelementen
IT1210289B (it) * 1987-05-14 1989-09-14 Co Em Spa Dispositivo per il caricamento automatico ed uniforme degli stampi di presse per la formazione di manufatti ceramici,in particolare piastrelle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN120680754A (zh) * 2025-08-25 2025-09-23 江苏富强特钢有限公司 一种对金属废料进行回收的压块机

Also Published As

Publication number Publication date
EP0281023A3 (fr) 1990-02-14
DD265521A3 (de) 1989-03-08

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