EP1327513A2 - Presse pour le moulage de produits en matériaux céramiques - Google Patents

Presse pour le moulage de produits en matériaux céramiques Download PDF

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Publication number
EP1327513A2
EP1327513A2 EP03000568A EP03000568A EP1327513A2 EP 1327513 A2 EP1327513 A2 EP 1327513A2 EP 03000568 A EP03000568 A EP 03000568A EP 03000568 A EP03000568 A EP 03000568A EP 1327513 A2 EP1327513 A2 EP 1327513A2
Authority
EP
European Patent Office
Prior art keywords
press
fixed
parts
movable
pressing plate
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Withdrawn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
EP03000568A
Other languages
German (de)
English (en)
Other versions
EP1327513A3 (fr
Inventor
Walter Manfredi
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.)
Welko Industriale SpA
Original Assignee
Welko Industriale SpA
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 Welko Industriale SpA filed Critical Welko Industriale SpA
Publication of EP1327513A2 publication Critical patent/EP1327513A2/fr
Publication of EP1327513A3 publication Critical patent/EP1327513A3/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Withdrawn legal-status Critical Current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
    • B30B15/04—Frames; Guides
    • B30B15/048—Laminated frame structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/04—Frames; Guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/065—Press rams
    • B30B15/067—Press rams with means for equalizing the pressure exerted by a plurality of press rams
    • 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
    • B30B15/183—Controlling the filling of the press cylinder during the approach stroke of the ram, e.g. prefill-valves
    • 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
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam

Definitions

  • the present invention relates to a press for ceramic products such as tiles and the like, in accordance with the introduction to the main claim.
  • the material for tiles or other similar products is subjected to known compression to obtain particular thicknesses.
  • the tiles are then dried and subjected to surface finishing, such as colouring.
  • the said pressing operation is carried out in hydraulic presses presenting a portal structure having a table comprising a plurality of (lower) moulds which in known manner receive the powder material to form the ceramic product; above the table a pressing plate moves carrying a corresponding plurality of (upper) moulds arranged to surface-cooperate with the powder material so as to compress it and form tiles of various dimensions and of predefined thickness.
  • the pressing plate is subjected to the action of a thrust member defined by two members movable relative to each other, one of which (for example a piston) is fixed to the plate and the other (for example a cylinder) is carried by the press structure.
  • the fixed member for example the cylinder, receives pressurized fluid (oil) from a suitable pressure feed source.
  • the pressing plate is usually subjected to the action of a movable member, for example the piston.
  • This piston is located in a suitable position on the plate, for example centrally along the longitudinal axis of symmetry of the plate perpendicular to the plate pressing surface (i.e. that surface which acts on the powder material).
  • An object of the present invention is to provide a press for ceramic products, such as tiles, in which the product leaving presents a substantially constant and uniform compaction such that the subsequent finishing operations do not present the aforesaid problems.
  • Another object is to provide a press the dimensions of which are identical or at least comparable with already known presses.
  • Another object is to provide a press of the stated type which is of reliable use, and has construction and maintenance costs comparable to those of known presses with their piston and cylinder of circular section.
  • a press for moulding ceramic materials such as tiles or the like, comprises a structure 1 presenting two portal-shaped vertical opposing portions 2 interconnected by a fixed table 3 for supporting the lower moulds 3A for the powder material to be subjected to pressing.
  • a movable (upper) table or plate 4 is present, supporting the upper moulds 4A, and subjected to the action of a pusher member 5 connected to a suitable source of pressurized fluid, such as oil.
  • the (pressing) plate 4 is arranged to be brought into contact with the powder material (inserted into the moulds of the table 3) in order to subject this material to pressing.
  • the pusher member comprises at least two parts 10A, 10B movable relative to corresponding fixed parts 11A and 11B; the movable parts are for example two pistons which move relative to and within two corresponding cylinders provided in an element 13 secured to the portal portions 2 and located over the pressing mould 4.
  • a reservoir 6 is present connected to the cylinders 11A, 11B by suitable channels 14.
  • a hydraulic circuit 8 with pump 9 is connected to the reservoir 6 and to the channels 14 and acts as the circuit for filling the cylinders at low pressure to lower the plate 4 relative to the table 3, and for emptying the cylinders to raise the plate 4.
  • the pressing plate 4 comprises opposing faces 20 and 21, the first 20 arranged to come into contact with the ceramic material to be pressed and the second 21 to cooperate with the pistons or movable parts 10A, 10B. These latter are fixed to the plate 4 in any known manner (for example by bolts 25), they are of circular cross-section and are positioned with their longitudinal axes K parallel and lying in a vertical plane common with the major longitudinal axis W of the plate 4 (see Figure 3).
  • the pistons 10 are therefore side by side. They are connected to a hydraulic circuit 23 arranged to equalize the thrust which they exert on the pressing plate 4 in order to make uniform the pressure which this latter exerts on the underlying ceramic material (lying on the table 3) via its face 20. This latter hence exerts a pressure on the underlying material which is equal over its large surface, resulting in considerable uniformity in the thickness of the products on which the plate 4 presses. This is achieved by virtue of the fact that by acting with two side-by-side pistons on the plate, the pressing force of this latter on the underlying material is equalized over an area which also reaches the free edges of the face 20 of the plate 4.
  • a characteristic of the invention is that the pressing force generated by the pistons 10 on the plate 4 is equal.
  • This is achieved by the hydraulic circuit 23.
  • This latter comprises a pump 30 connected to a conduit 31 formed within the plate 4 and connected to a conduit 32 provided within the piston 10A.
  • the conduit opens into an annular chamber 33, of large transverse surface, provided below an internal part of the piston 10A.
  • the conduit 31 is connected to channels 31A and 31B, the first connected to the pump 30 and the second to a reservoir 34 via opposing unidirectional valves 80.
  • the cylinder 11A within which the piston 10A moves is connected to the cylinder 11B within which the piston 10B moves, via a conduit 35 which opens into the top 11K of the cylinder 11B.
  • Another conduit 36 is connected to the conduit 35 and terminates on the outside of the element 13 where it is connected to two parallel channels 38 and 39, provided with unidirectional valves 38A and 39A and connected respectively to a pump 40 and to a reservoir 41.
  • Other conduits 42 and 43 connect each valve 18 (that above the pistons 10A) to a pump 44 via counter-flowing unidirectional valves 45 and 46.
  • the valve 45 connects the conduit 42 to the pump 44, the valve 46 connecting this conduit to a reservoir 47.
  • the conduit 43 is directly connected to the pump 44.
  • the ceramic material for the tiles is inserted into the moulds of the table 3 by a suitable known feeder.
  • the valves 18 are then activated to open them (by means of the circuit comprising the conduits 42, 43 and the members connected to them), so that the fluid (oil) passes from the reservoir 6 to the cylinders 11A and 11B.
  • Said fluid is pressurized (also closing the valves 18) to 50 bar by the pump 40, and the pressing plate 4 is urged into contact with the material located on the table 3.
  • the valve 38B is then opened and the pressure in the cylinders falls to zero.
  • the plate 4 is in contact with the products on the table 3 and causes air to escape from them.
  • the pump 40 is reactivated to again pressurize the oil in the cylinders 11A and 11B, to the line pressure (200 bar).
  • the valves 38A and 39B are closed.
  • the pump 30 of the circuit 23 is then activated to feed pressurized fluid into the conduit 32 and into the chamber 33; this causes the piston 10A to further pressurize the oil of both cylinders to the final pressing pressure (for example a maximum of 400 bar) via the conduit 36 connecting the cylinders together, to hence equalize the pressure exerted by both the pistons on the plate 4. In this manner the products on the table 3 are pressed.
  • the pressure is released from the conduit 32 and the plate 4 can be raised by feeding oil through the conduit 35 and from there through a conduit 56 connected to the cylinders 11A and 11B in a position close to that from which the pistons 10A and 10B emerge.
  • the cylinders 11A and 11B are released by opening the valves 18, and by maintaining the pressure within the conduit 56, the pistons 10A and 10B and the plate 4 connected to them rise.
  • a preferred embodiment of the invention has been described; others are however possible, such as one in which the pusher member 5 is associated with a pressing plate 4 with more than two movable parts (for example pistons), or in which the member 5 is defined by cylinders rigid with the plate 4 and pistons rigid with the structure 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
EP03000568A 2002-01-14 2003-01-13 Presse pour le moulage de produits en matériaux céramiques Withdrawn EP1327513A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20020020 2002-01-14
ITMI20020020 ITMI20020020U1 (it) 2002-01-14 2002-01-14 Pressa di stampaggio di prodotti di materiale ceramico

Publications (2)

Publication Number Publication Date
EP1327513A2 true EP1327513A2 (fr) 2003-07-16
EP1327513A3 EP1327513A3 (fr) 2005-05-25

Family

ID=11448808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03000568A Withdrawn EP1327513A3 (fr) 2002-01-14 2003-01-13 Presse pour le moulage de produits en matériaux céramiques

Country Status (2)

Country Link
EP (1) EP1327513A3 (fr)
IT (1) ITMI20020020U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100371159C (zh) * 2005-11-29 2008-02-27 太原重型机械集团有限公司 横向预紧板框式液压机

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2095420A1 (en) * 1970-06-03 1972-02-11 Tech Radio Mecaniqu Two stage punching press - with controllable throws and pressures
DE2240674A1 (de) * 1971-09-02 1973-03-08 Welko Ind Spa Presse zur herstellung keramischer gegenstaende
US4128376A (en) * 1976-10-28 1978-12-05 Sergio Albertazzi Pressing arrangement for compressing ceramic and refractory materials into tile preforms
JPS58224100A (ja) * 1982-06-21 1983-12-26 Komatsu Ltd 油圧プレスのスライド制御装置
IT1138948B (it) * 1981-10-12 1986-09-17 Welko Ind Spa Pressa idraulica per la produzione di materiali ceramici e simili
DE3714420A1 (de) * 1987-04-30 1988-11-10 Laeis Gmbh Presse fuer keramische formteile, insbesondere fliesen
EP0911129A2 (fr) * 1997-08-27 1999-04-28 KOBRA FORMEN-UND ANLAGENBAU GmbH Moule pour la fabrication d'articles pressés
EP0916461A1 (fr) * 1997-11-17 1999-05-19 Sama S.R.L. Dispositif de pressage
EP0931644A1 (fr) * 1998-01-21 1999-07-28 Longinotti Meccanica S.r.l. Presse pour presser des carreaux fabriqués en ciment et un aggrégat quelconque tel que de la pierre concassée ou similaire

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2095420A1 (en) * 1970-06-03 1972-02-11 Tech Radio Mecaniqu Two stage punching press - with controllable throws and pressures
DE2240674A1 (de) * 1971-09-02 1973-03-08 Welko Ind Spa Presse zur herstellung keramischer gegenstaende
US4128376A (en) * 1976-10-28 1978-12-05 Sergio Albertazzi Pressing arrangement for compressing ceramic and refractory materials into tile preforms
IT1138948B (it) * 1981-10-12 1986-09-17 Welko Ind Spa Pressa idraulica per la produzione di materiali ceramici e simili
JPS58224100A (ja) * 1982-06-21 1983-12-26 Komatsu Ltd 油圧プレスのスライド制御装置
DE3714420A1 (de) * 1987-04-30 1988-11-10 Laeis Gmbh Presse fuer keramische formteile, insbesondere fliesen
EP0911129A2 (fr) * 1997-08-27 1999-04-28 KOBRA FORMEN-UND ANLAGENBAU GmbH Moule pour la fabrication d'articles pressés
EP0916461A1 (fr) * 1997-11-17 1999-05-19 Sama S.R.L. Dispositif de pressage
EP0931644A1 (fr) * 1998-01-21 1999-07-28 Longinotti Meccanica S.r.l. Presse pour presser des carreaux fabriqués en ciment et un aggrégat quelconque tel que de la pierre concassée ou similaire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 080 (M-289), 12 April 1984 (1984-04-12) & JP 58 224100 A (KOMATSU SEISAKUSHO KK), 26 December 1983 (1983-12-26) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100371159C (zh) * 2005-11-29 2008-02-27 太原重型机械集团有限公司 横向预紧板框式液压机

Also Published As

Publication number Publication date
ITMI20020020U1 (it) 2003-07-14
EP1327513A3 (fr) 2005-05-25
ITMI20020020V0 (it) 2002-01-14

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