EP0629495B1 - Modular hydraulic press for producing ceramic items - Google Patents

Modular hydraulic press for producing ceramic items Download PDF

Info

Publication number
EP0629495B1
EP0629495B1 EP94108644A EP94108644A EP0629495B1 EP 0629495 B1 EP0629495 B1 EP 0629495B1 EP 94108644 A EP94108644 A EP 94108644A EP 94108644 A EP94108644 A EP 94108644A EP 0629495 B1 EP0629495 B1 EP 0629495B1
Authority
EP
European Patent Office
Prior art keywords
pressing
press
items
producing ceramic
hydraulic 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 - Lifetime
Application number
EP94108644A
Other languages
German (de)
French (fr)
Other versions
EP0629495A1 (en
Inventor
Rodiero Alieri
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.)
Sacmi Imola SC
Original Assignee
Sacmi Imola SC
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 Sacmi Imola SC filed Critical Sacmi Imola SC
Publication of EP0629495A1 publication Critical patent/EP0629495A1/en
Application granted granted Critical
Publication of EP0629495B1 publication Critical patent/EP0629495B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/02Producing 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
    • B28B3/04Producing 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 with one ram per mould
    • B28B3/06Producing 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 with one ram per mould with two or more ram and mould sets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B1/00Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/32Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B11/00Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02Presses 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 present invention relates to a modular hydraulic press for producing ceramic items.
  • Known hydraulic presses for pressing ceramic items starting from partially dry powder are schematically shown in figures 1, 2 and 3 and comprise (see figure 1) a closed metal structure (1) which is generally shaped like a quadrangular frame and inside which there is the pressing module (2) which is suitable to produce the necessary thrust between the parts of the pressing fixture (mold).
  • the pressing fixture is generally constituted by two or more parts, of which at least one is movable (3) and the others are fixed (4).
  • the pressing module (2) meant to generate the necessary thrust is generally of the hydraulic type.
  • the cycle for pressing a ceramic item comprises the following steps:
  • a severe limitation of the solution shown in figure 3 is the fact that the items to be obtained must be identical, or in any case the technological pressing cycle must be exactly the same, as it is impossible to mount various different fixtures in a single pressing module. This happens in flooring and wall ceramics, where the movable beam of the press carries a plurality of pressing fixtures capable of producing up to dozens of parts with a single pressing stroke. In other fields (such as for example in crockery) one must instead deal with types of items which may even be significantly different from each other, with a consequent difference in the technological pressing cycles (particularly, different times for the various steps).
  • the simultaneous presence of different pressing fixtures, moved by a single beam thus prevents the full utilization of said fixtures, since the slowest technological cycle determines the overall production rate of the unit. In such cases, the solution of figure 3 can only partially meet a high demand for productivity.
  • DE-C-893 400 discloses a press as defined in the precharacterizing portion of the appended claim 1.
  • the technical aim of the present invention is to provide a hydraulic press that can obviate the shortcomings of known ones, especially as regards the possibility of optimizing the production cycle with respect to the characteristics of the items to be obtained.
  • an important object of the present invention is to provide a press that allows to perform maintenance or to replace pressing fixtures without requiring the complete halting of the production cycle.
  • the reference numeral 6 designates the frame of the press, which conventionally comprises a base 7 from which posts 8 rise; said posts are mutually connected, at the top, by a fixed beam 9 so as to form a closed structure which can withstand the thrusts occurring during the pressing step.
  • Two pressing modules 10, 11 are supported in the structure, and each one has its own pressing fixture, the activation of each fixture being managed independently of the other one.
  • the fixture comprises, in a known manner which is accordingly not described in detail, a moving part 12 constituted by a plunger which, by means of a hydraulic jack 13, is actuated against a fixed part 14 constituted by a strike block that rests on the base and forms, together with a mold, the chamber for the containment and forming of the ceramic item.
  • the fixture comprises two parts which, when placed mutually adjacent, form a material containment chamber.
  • One of these parts is covered, at the front, by an elastic layer, made for example of rubber, which, by deforming under the action of a pressurized liquid, compresses the material which is contained in the chamber.
  • an elastic layer made for example of rubber, which, by deforming under the action of a pressurized liquid, compresses the material which is contained in the chamber.
  • the two modules 10 and 11 can be managed independently, without one being able to interfere with the other.
  • Another substantial advantage of the present invention is the possibility of intervention on one module while the other one is still operating.
  • This option is particularly useful when having to change the type of items produced by replacing the mold.
  • a separation device 16 that isolates the module requiring intervention from the adjacent one, ensuring the safety of the assigned personnel.
  • the press is managed by a programmable control system which is aimed at providing the maximum utilization of the production capabilities of the pressing fixtures and at adapting the pressing modules to the production cycles so as to provide synchronization of the modules when the items to be pressed are identical.
  • the pressing modules can be fed with a pressurized fluid by a single hydraulic control unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Description

  • The present invention relates to a modular hydraulic press for producing ceramic items.
  • Known hydraulic presses for pressing ceramic items starting from partially dry powder are schematically shown in figures 1, 2 and 3 and comprise (see figure 1) a closed metal structure (1) which is generally shaped like a quadrangular frame and inside which there is the pressing module (2) which is suitable to produce the necessary thrust between the parts of the pressing fixture (mold). The pressing fixture is generally constituted by two or more parts, of which at least one is movable (3) and the others are fixed (4). The pressing module (2) meant to generate the necessary thrust is generally of the hydraulic type.
  • With a press of this type, the cycle for pressing a ceramic item comprises the following steps:
    • -- loading: the pressing fixture is filled with an appropriate amount of ceramic powder;
    • -- pressing: the ceramic powder is compacted by means of rigid plungers (mechanical pressing) or elastic ones (isostatic pressing) until the required degree of compaction is achieved;
    • -- extraction: the ceramic part thus formed is removed from the pressing fixture to allow the fixture to be rapidly restored for a subsequent cycle.
  • In a large number of industrial processes, in order to ensure appropriate productivity of the entire system, it is necessary to pool several machines to press items that have the same characteristics or different ones. This fact requires a considerable capital investment, since pressing machines are generally characterized initially by high purchase costs and subsequently by equally high operating costs.
  • In an attempt to increase the productivity of the individual machine with a limited additional investment, in some applications which are typical of the ceramics industry (e.g. flooring and wall tiles, crockery, etc.) more than one pressing fixture is introduced in a single press, as shown in figure 3. In this arrangement, the moving parts (3), i.e. the plungers of the molds, are fixed to a movable beam (5) which is rigidly connected to the same pressing module (2) of figure 1.
  • A severe limitation of the solution shown in figure 3 is the fact that the items to be obtained must be identical, or in any case the technological pressing cycle must be exactly the same, as it is impossible to mount various different fixtures in a single pressing module. This happens in flooring and wall ceramics, where the movable beam of the press carries a plurality of pressing fixtures capable of producing up to dozens of parts with a single pressing stroke. In other fields (such as for example in crockery) one must instead deal with types of items which may even be significantly different from each other, with a consequent difference in the technological pressing cycles (particularly, different times for the various steps). The simultaneous presence of different pressing fixtures, moved by a single beam, thus prevents the full utilization of said fixtures, since the slowest technological cycle determines the overall production rate of the unit. In such cases, the solution of figure 3 can only partially meet a high demand for productivity.
  • DE-C-893 400 discloses a press as defined in the precharacterizing portion of the appended claim 1.
  • The technical aim of the present invention is to provide a hydraulic press that can obviate the shortcomings of known ones, especially as regards the possibility of optimizing the production cycle with respect to the characteristics of the items to be obtained.
  • Within the scope of this aim, an important object of the present invention is to provide a press that allows to perform maintenance or to replace pressing fixtures without requiring the complete halting of the production cycle.
  • With this aim and this object in view, there is provided, according to the present invention, a press for producing ceramic items as defined in the appended claims.
  • Further advantages of the invention will become apparent from the following non-limitative detailed description thereof with reference to the accompanying drawings, wherein:
    • figure 1 illustrates a machine with a vertical operating axis according to the prior art;
    • figure 2 illustrates a machine with a horizontal working axis according to the prior art;
    • figure 3 is a schematic view of a vertical-axis press according to the prior art, with more than one pressing fixtures;
    • figure 4 is a schematic view of a vertical-axis press according to the present invention; and
    • figure 5 is a schematic view of a horizontal-axis press according to the present invention.
  • With reference to the above figures, the reference numeral 6 designates the frame of the press, which conventionally comprises a base 7 from which posts 8 rise; said posts are mutually connected, at the top, by a fixed beam 9 so as to form a closed structure which can withstand the thrusts occurring during the pressing step.
  • Two pressing modules 10, 11 are supported in the structure, and each one has its own pressing fixture, the activation of each fixture being managed independently of the other one.
  • In the case of mechanical pressing, the fixture comprises, in a known manner which is accordingly not described in detail, a moving part 12 constituted by a plunger which, by means of a hydraulic jack 13, is actuated against a fixed part 14 constituted by a strike block that rests on the base and forms, together with a mold, the chamber for the containment and forming of the ceramic item.
  • In the case of isostatic pressing, the fixture comprises two parts which, when placed mutually adjacent, form a material containment chamber.
  • One of these parts is covered, at the front, by an elastic layer, made for example of rubber, which, by deforming under the action of a pressurized liquid, compresses the material which is contained in the chamber.
  • As can be seen, the two modules 10 and 11 can be managed independently, without one being able to interfere with the other.
  • In this manner it is possible to produce items that have different technological parameters and thus require different production times and compaction pressures.
  • For example, it is possible to produce tiles with one pressing module and special filler parts with a different shape with the other module.
  • Another substantial advantage of the present invention is the possibility of intervention on one module while the other one is still operating.
  • This option is particularly useful when having to change the type of items produced by replacing the mold. Advantageously, for safety reasons, between one module and the other there is interposed a separation device 16 that isolates the module requiring intervention from the adjacent one, ensuring the safety of the assigned personnel.
  • From an operational point of view, the press is managed by a programmable control system which is aimed at providing the maximum utilization of the production capabilities of the pressing fixtures and at adapting the pressing modules to the production cycles so as to provide synchronization of the modules when the items to be pressed are identical.
  • The pressing modules can be fed with a pressurized fluid by a single hydraulic control unit.
  • The same inventive concept described above with respect to a vertical press can be used in horizontal presses according to the diagram of figure 5.
  • Naturally, the number and arrangement of the pressing modules can vary at will according to the requirements.
  • Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly such reference signs do not have any limiting effect on the scope of each element identified by way of example by such reference signs.

Claims (3)

  1. Press for producing ceramic items, comprising, in a single frame (6), two or more pressing modules (10,11) which are mutually individually and independently manageable, the press being characterized in that it further comprises a single programmable control system for independently and individually managing the pressing modules (10,11).
  2. Press according to claim 1, characterized in that it comprises a single hydraulic control unit for supplying the pressing modules (10, 11) with a pressurized fluid.
  3. Press according to one or more of the preceding claims, characterized in that safety devices (16) are interposed between the pressing modules (10,11).
EP94108644A 1993-06-17 1994-06-06 Modular hydraulic press for producing ceramic items Expired - Lifetime EP0629495B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT93BO000275A IT1265914B1 (en) 1993-06-17 1993-06-17 MODULAR HYDRAULIC PRESS FOR THE PRODUCTION OF CERAMIC ARTICLES.
ITBO930275 1993-06-17

Publications (2)

Publication Number Publication Date
EP0629495A1 EP0629495A1 (en) 1994-12-21
EP0629495B1 true EP0629495B1 (en) 1997-09-03

Family

ID=11339132

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94108644A Expired - Lifetime EP0629495B1 (en) 1993-06-17 1994-06-06 Modular hydraulic press for producing ceramic items

Country Status (4)

Country Link
EP (1) EP0629495B1 (en)
DE (1) DE69405303T2 (en)
ES (1) ES2109548T3 (en)
IT (1) IT1265914B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19514045A1 (en) * 1995-04-13 1996-10-17 Haendle Gmbh & Co Kg Brick press
WO2010128953A1 (en) 2009-05-04 2010-11-11 Scg Building Materials Co., Ltd. Method and apparatus for forming and pressing powder materials

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE893400C (en) * 1951-05-31 1953-10-15 Robert Buerkle & Co Spezialmas Hydraulic veneer press, consisting of one or more individual presses
DE2016953A1 (en) * 1970-04-09 1971-10-21 Laeis-Werke Ag, 5500 Trier Double press
ES406212A1 (en) * 1971-09-02 1976-01-16 Walchhutter Press, particularly for the manufacture of ceramic and refractory articles

Also Published As

Publication number Publication date
DE69405303D1 (en) 1997-10-09
IT1265914B1 (en) 1996-12-16
ITBO930275A0 (en) 1993-06-17
ES2109548T3 (en) 1998-01-16
EP0629495A1 (en) 1994-12-21
DE69405303T2 (en) 1998-01-29
ITBO930275A1 (en) 1994-12-17

Similar Documents

Publication Publication Date Title
US6309206B1 (en) Plant for forming ceramic tiles, including those of large dimensions, by means of a partially isostatic molds
EP0629495B1 (en) Modular hydraulic press for producing ceramic items
CA2095818A1 (en) Vertical press and process for operating the same
EP1106336B1 (en) An apparatus for removing air from soft powder material in a press-forming cycle for manufacture of ceramic products
US5085570A (en) Press for forming bodies
EP1250990B1 (en) Method for producing ceramic articles
EP1136212B1 (en) An improved device for forming ceramic products, including slabs, tiles and the like, by powder pressing
SU1079359A1 (en) Installation for hot compacting of powder
CN207899941U (en) A kind of numerical control metal plate attachment former
CA2276106A1 (en) Method and device for forming articles from pulp slurry
CN215282987U (en) Pipe shell product forming equipment
JPH0154172B2 (en)
CN212533537U (en) Disposable green articles for use molding system
SU1291440A1 (en) Hydraulic press
CN220297932U (en) Universal stretching frame for die
KR200175072Y1 (en) Root-let forming device of electric pole
CN221109894U (en) Pressing machine for producing powder metallurgy padlock body
JPH0371960B2 (en)
CN219709949U (en) Paper pulp manufacturing die for hot press forming
GB2211130A (en) Ceramic moulding press
EP0519414A2 (en) Pressing apparatus particularly for sheet-like elements such as hides, fabrics, leather and the like
JPH04237600A (en) Compression molding machine
JP6015495B2 (en) Powder molding equipment
RU2341371C2 (en) Method of items molding from powdery polymers and device for its realisation
KR950004234Y1 (en) Molding Equipment of Teflon Rod Molding Machine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB

17P Request for examination filed

Effective date: 19950408

17Q First examination report despatched

Effective date: 19960116

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB

ET Fr: translation filed
REF Corresponds to:

Ref document number: 69405303

Country of ref document: DE

Date of ref document: 19971009

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2109548

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20080606

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20080617

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20080630

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20080527

Year of fee payment: 15

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20090606

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20100226

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090606

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100101

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20090608

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090608