EP0421505A2 - Vorrichtung zum Regeln eines hydraulischen Druckes, insbesondere für Keramikformpressen mit beweglichem Unterstempel und Gegenstempel - Google Patents

Vorrichtung zum Regeln eines hydraulischen Druckes, insbesondere für Keramikformpressen mit beweglichem Unterstempel und Gegenstempel Download PDF

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Publication number
EP0421505A2
EP0421505A2 EP90202381A EP90202381A EP0421505A2 EP 0421505 A2 EP0421505 A2 EP 0421505A2 EP 90202381 A EP90202381 A EP 90202381A EP 90202381 A EP90202381 A EP 90202381A EP 0421505 A2 EP0421505 A2 EP 0421505A2
Authority
EP
European Patent Office
Prior art keywords
die
valve
hydraulic
counter
punches
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
EP90202381A
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English (en)
French (fr)
Other versions
EP0421505B1 (de
EP0421505A3 (en
Inventor
Lodovico Bardelli
Franco Regnani
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.)
Mass SpA
Original Assignee
Mass SpA
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Publication date
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Priority to AT90202381T priority Critical patent/ATE97360T1/de
Publication of EP0421505A2 publication Critical patent/EP0421505A2/de
Publication of EP0421505A3 publication Critical patent/EP0421505A3/en
Application granted granted Critical
Publication of EP0421505B1 publication Critical patent/EP0421505B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
    • 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

Definitions

  • This invention relates to a hydraulic pressure regulator device for hydraulic systems in general, and particularly for the hydraulic circuits of ceramic presses equipped with forming moulds with a mobile bottom die and a counter-die.
  • the secondary apparatus controls at least one apparatus, called hereinafter the secondary apparatus, with a certain delay relative to another apparatus, called hereinafter the main apparatus.
  • the main apparatus controls at least one apparatus, called hereinafter the secondary apparatus, with a certain delay relative to another apparatus, called hereinafter the main apparatus.
  • the main apparatus there is also the problem of having to regulate the duration of said delay between the operation of said secondary apparatus and that of said main apparatus, said duration depending on a multiplicity of factors, which will not be listed as they are strictly related to specific requirements of the respective industrial sector.
  • the bottom die cavities are closed by hydraulically controlled punches which form the laying face of the tiles, whereas the cavities of the counter-die are closed upperly by punches which form the exposed face of the tiles.
  • said upper punches are arranged to move independently of the counter-die so as to occupy two opposing positions, namely a withdrawn (or raised) position and an advanced (or lowered) position, in the second of which they extract the tiles from the cavities in the counter-die.
  • the upper punches are lowered (according to the aforesaid document) by at least one first hydraulic chamber which is connected to the hydraulic circuit of the press via a valve, whereas said upper punches are raised, after said first chamber has been discharged via said valve, by the clay which is in a compacted state in the cavities of the counter-die.
  • Said upper punches are maintained in their raised position by a second hydraulic chamber which is permanently connected to a pressurized hydraulic reservoir, in which the pressure is maintained by an inert gas atmosphere.
  • the main object of the present invention is to provide a hydraulic device able to satisfy said requirements with complete elimination of the aforesaid problems, within the context of a rational, reliable and low-cost construction.
  • the proposed device is particularly but not exclusively suitable for ceramic moulds of the initially described type, and comprises two intercommunicating chambers of which one is connected to the hydraulic circuit which drives the lower punches relative to the bottom die, and the other is connected to at least one hydraulic chamber which drives the upper punches relative to the counter-die, the first of said two chambers housing an elastically loaded valve arranged to close or not close the connection between the two chambers, and the second of said two chambers housing the active end of a slidable push rod sensitive to the pressure in said first chamber via a conduit which connects said first chamber to the seat of said push rod.
  • said means during the raising of the mould counter-­die said first chamber is pressurized by the hydraulic fluid from said lower punch operating circuit, and the same fluid, via said conduit, causes the push rod to advance.and thus the valve to open, with consequent passage of said fluid into the hydraulic chamber for operating the upper punches.
  • the pressurized hydraulic fluid from said chamber for operating the upper punches causes the push rod to withdraw so that it discharges through the passage port existing between said two chambers and established by said valve, after which this latter closes.
  • the invention comprises an elongate outer shell or casing 100 through which a longitudinal hole with different cross-sections passes and is closed by two end plugs 10 and 11 respectively.
  • said longitudinal hole houses a pin 2 for adjusting the loading of a facing helical thrust spring 3; a cup-shaped passage valve 4 mounted on said spring 3; a push rod 5 for opening said valve 4; a piston 6 for controlling said push rod 5; and a counteracting spring 7 which is mounted slackly on the rod 5 and rests at its ends against said casing 100 and against said piston 6.
  • the distance between the facing ends of the piston 6 and the plug 11 and thus the loading of the spring 7 can be adjusted by a screw 12 screwed into said plug 11.
  • the operating position of the pin 2 and thus the loading of the spring 3 can be adjusted by the adjustment screw 13 screwed into the plug 10.
  • annular chamber 122 into which two conduits 33 (Figure 2) and 121 ( Figure 1) open, the valve 4 being provided with a channel 40 for connecting said chamber 122 to the rear housing of the spring 3.
  • the conduit 33 (see Figure 3) is connected to a conduit 66 the purpose of which is specified hereinafter, while the conduit 121 terminates at the plug 11 ( Figure 1).
  • a flow regulator valve 44 and a non-return valve 55 are connected in parallel as can be seen in Figure 1. That end of the valve 4 which faces the rod 5 has a conical sealing surface 42 with which there corresponds on the casing 100 a valve seat 41 through which the active end of the rod 5 can pass, as described hereinafter.
  • the reference numeral 43 indicates a passage hole for the removal/recovery of possible seepages.
  • the plug 11 comprises a right-angled conduit 16, of which the radial part opens into an annular chamber 15 between said plug 11 and said casing 100, the longitudinal part allowing free passage of said screw 12 and opening in front of said piston 6.
  • annular chamber 15 is connected to said conduit 121 (see Figure 1), the reference numeral 99 indicating an interchangeable travel-limiting disc lying between the piston 6 and the spring 7.
  • this shows part of a usual ceramic press of the type comprising a vertically mobile bottom die and a counter-die, and which will be described in terms only of its essential parts, reference to the initially mentioned document being suggested for further details.
  • FIG. 3 shows a pressing plate 17 intended to be placed on the bed (not shown) of a usual hydraulic ceramic press, a platform 18 fixed to said plate 17, a plate 19 provided above the platform 18 and driven vertically by cylinder-piston units (not shown) connected via the conduit 66 to the hydraulic circuit of said press, and a series of punches 20 for forming the laying face of the tiles and which are fixed to said plate 19.
  • the punches 20 are slidingly received in corresponding cavities 21 for loading the soft clay 23, these latter being formed in a bottom die 24.
  • the bottom die 24 is mounted to slide relative to the platform 18 on underlying cylindrical bars 25, on these latter there being mounted respective compressed springs 26 arranged to keep the bottom die 24 completely raised.
  • the vertical travel of the bottom die 24 can be achieved by convenient hydraulic cylinder-piston units.
  • a counter-die 240 comprising cavities 210 in which respective punches 200 are slidingly mounted for forming the exposed face of the tiles.
  • the punches 200 are fixed to an overlying plate 190 which is secured to the mobile cross-member 27 of the press.
  • each piston 29 and said mobile cross-member 27 there are provided an upper hydraulic chamber 280 connected to the conduit 88 and a lower chamber 281 for collecting any seepage.
  • the device of the invention operates as follows. At the beginning of the cycle the mould is in the configuration shown in Figure 3 with the plate 190 separated from the cross-member, and the device of the invention is in the configuration shown in Figure 1 with the conduit 88 under pressure and the conduit 33 connected to discharge.
  • the cross-­member 27 is lowered to rest against the bottom die 24, which in its turn is lowered.
  • the situation is such that the punches 20 approach the punches 200, with simultaneous transfer of the clay 523 from the cavities 21 to the cavities 210, it being pressed both from below and from above.
  • the opening of the valve 4 can be adjusted as required using the adjustment screw 13, by which a choice can be made of the resistance offered by the upper punch 200 to the thrust of the clay 23 as it is transferred, and thus the duration of the total rearward stroke of said upper punch 200, ie until the plate 190 rests against the cross-member 27. Because of this delay or braking or timing of the rearward travel of the upper punch 200 compared with its virtually free travel in the known art, the deaeration period of the clay 23 can be considerably increased, with the result that statistically all the finer particles contained in the clay 23 leave the cavity 210.
  • the exposed surface of the tile is virtually free of very fine powdery material, so that the subsequent application and adhesion of the glaze presents no problems, or alternatively the exposed surface of tiles which are not to undergo glazing, such as those in porcelainized fine ceramic sandstone, have a virtually complete "velvet" appearance which is characteristic of such unglazed materials.
  • valve 4 On termination of the pressing stage the valve 4 ( Figure 1, 2) is closed and the counter-die 240 is raised followed by the bottom die 24, together with the tiles contained in the cavities 210.
  • the punches 20 are also simultaneously raised under the control of said cylinder-piston units, which are fed with pressurized hydraulic fluid through the conduit 66 (see Figure 3).
  • the same hydraulic fluid passes through the conduit 33 to reach the chamber 122, to then enter the conduit 121 and pass through the valve 44 to reach the conduit 16 (see Figure 1).
  • This causes the piston 6 to advance against the thrust of the spring 7, said piston 6 causing the rod 5 to advance after a small free movement defined by the gap between the disc 99 and the rod 5.
  • valve 4 moves into its closed position shown in Figure 1, with withdrawal of the rod 5, and the spring 7 urges the piston 6 against the screw 12.
  • the oil located between said piston 6 and plug 11 enters the conduit 121 (see Figure 1) and passes through the valve 55 to penetrate into the chamber 122, from which it discharges to the reservoir via the conduit 33 ( Figure 2).
  • the valve 55 also closes, with simultaneous trapping of the hydraulic fluid (oil) which is present in the chamber 280 ( Figure 3), in the conduit 88 ( Figures 1, 2, 3), in the chamber 22 ( Figures 1, 2) and in part of the conduit 121 leading from the plug 11 to the valves 44 and 55.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Press Drives And Press Lines (AREA)
EP90202381A 1989-10-02 1990-09-07 Vorrichtung zum Regeln eines hydraulischen Druckes, insbesondere für Keramikformpressen mit beweglichem Unterstempel und Gegenstempel Expired - Lifetime EP0421505B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90202381T ATE97360T1 (de) 1989-10-02 1990-09-07 Vorrichtung zum regeln eines hydraulischen druckes, insbesondere fuer keramikformpressen mit beweglichem unterstempel und gegenstempel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4687189 1989-10-02
IT04687189A IT1237568B (it) 1989-10-02 1989-10-02 Dispositivo idraulico regolatore di pressione,tipicamente per stampi ceramici con matrice mobile e contromatrice

Publications (3)

Publication Number Publication Date
EP0421505A2 true EP0421505A2 (de) 1991-04-10
EP0421505A3 EP0421505A3 (en) 1991-11-27
EP0421505B1 EP0421505B1 (de) 1993-11-18

Family

ID=11260010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90202381A Expired - Lifetime EP0421505B1 (de) 1989-10-02 1990-09-07 Vorrichtung zum Regeln eines hydraulischen Druckes, insbesondere für Keramikformpressen mit beweglichem Unterstempel und Gegenstempel

Country Status (4)

Country Link
EP (1) EP0421505B1 (de)
AT (1) ATE97360T1 (de)
DE (1) DE69004658T2 (de)
IT (1) IT1237568B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITAN20110141A1 (it) * 2011-10-19 2013-04-20 Manenti S P A Tampone migliorato per stampo per l'industria ceramica e stampo comprendente un tale tampone.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10357423A1 (de) * 2003-12-04 2005-06-30 Rolls-Royce Deutschland Ltd & Co Kg Schnellschlussventil zum Unterbrechen eines Fluidstroms

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1682172A (en) * 1928-08-28 Automatic hydraulic press
FR641383A (fr) * 1927-09-24 1928-08-02 Dispositif de commande de mécanismes à pression, à actions sucessives
IT1107475B (it) * 1978-07-24 1985-11-25 Merisinter Spa Complesso di pressa e porta-stampo per la compattazione nella metallurgia delle polveri
IT1187779B (it) * 1985-04-10 1987-12-23 Mass Spa Stampo ceramico con matrice mobile per la formatura di piastrelle di qualsiasi formato e di piastrelle con supproto a piu' componenti,come le piastrelle presso-smaltate
DE3527594A1 (de) * 1985-08-01 1987-02-12 Sacmi Presse, insbesondere fuer die herstellung von keramikfliesen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITAN20110141A1 (it) * 2011-10-19 2013-04-20 Manenti S P A Tampone migliorato per stampo per l'industria ceramica e stampo comprendente un tale tampone.
EP2583802A1 (de) 2011-10-19 2013-04-24 Manenti S.p.A. Verbesserte Formplatte für die keramische Industrie und Form mit solcher Platte

Also Published As

Publication number Publication date
IT8946871A1 (it) 1991-04-02
DE69004658T2 (de) 1994-03-10
DE69004658D1 (de) 1993-12-23
EP0421505B1 (de) 1993-11-18
IT8946871A0 (it) 1989-10-02
ATE97360T1 (de) 1993-12-15
EP0421505A3 (en) 1991-11-27
IT1237568B (it) 1993-06-08

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