EP1958745A2 - Isostatische Form zum Pressen von Fliesen und entsprechendes Herstellungsverfahren - Google Patents

Isostatische Form zum Pressen von Fliesen und entsprechendes Herstellungsverfahren Download PDF

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Publication number
EP1958745A2
EP1958745A2 EP08002726A EP08002726A EP1958745A2 EP 1958745 A2 EP1958745 A2 EP 1958745A2 EP 08002726 A EP08002726 A EP 08002726A EP 08002726 A EP08002726 A EP 08002726A EP 1958745 A2 EP1958745 A2 EP 1958745A2
Authority
EP
European Patent Office
Prior art keywords
base
plate
isostatic
cladding
upper face
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Withdrawn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
EP08002726A
Other languages
English (en)
French (fr)
Other versions
EP1958745A3 (de
Inventor
Luciano Silvestrini
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.)
MARTINELLI ETTORE Srl
Original Assignee
MARTINELLI ETTORE Srl
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 MARTINELLI ETTORE Srl filed Critical MARTINELLI ETTORE Srl
Publication of EP1958745A2 publication Critical patent/EP1958745A2/de
Publication of EP1958745A3 publication Critical patent/EP1958745A3/de
Withdrawn legal-status Critical Current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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/346—Manufacture of moulds
    • 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
    • B28B3/024—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 the pressure on the material being transmitted through flexible or resilient wall parts, e.g. flexible cushions on the ramming surface, resilient wall parts pressing as a result of deformation caused by ram pressure
    • 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
    • B30B11/001—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a flexible element, e.g. diaphragm, urged by fluid pressure; Isostatic presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/02—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of a flexible element, e.g. diaphragm, urged by fluid pressure

Definitions

  • the present invention relates to an innovative isostatic buffer of the type used for producing ceramic tiles, and also to a method for manufacturing such a buffer.
  • the isostatic circuit comprises various chambers that communicate with one another (or possibly also a single chamber) and the fluid is distributed in the inside thereof so as to compensate for possible lacks of homogeneity in the density and compactness of the earth that is being pressed.
  • the chambers of the isostatic circuit are obtained directly in a face of a metal base of the buffer (typically made of steel), which is then covered with a membrane made of rubber or of other yieldable materials so as to close the chambers above and form the pressing surface.
  • a drilled blade (made of metal or plastics) to an upper face of the base of the buffer, which is then coated with a cast of yieldable material (rubber or resin) so as to incorporate the blade.
  • the cladding is vulcanised; then oil is introduced into a cavity between the blade and the cladding to form the isostatic circuit of the buffer. The oil flows below the blade from the side facing the base.
  • the general object of the present invention is to overcome the aforesaid drawbacks by providing a method for manufacturing isostatic buffers which is rapid and cheap, and which enables a functional and reliable buffer to be obtained.
  • a further object is to provide a buffer with a simple, cheap structure, so as to have a satisfactory seal and which is able to limit considerably the transparency effect in the tiles produced.
  • an isostatic buffer for pressing tiles comprising a base, a plate applied to an upper face of the base and a cladding made of a yieldable material that at least partially incorporates said plate and makes a pressing surface of the buffer, the base comprising at least a conduit that leads by means of an opening onto the upper face of the base to feed incompressible fluid to an isostatic circuit formed between the plate and the yieldable cladding, characterised in that the isostatic circuit is confined between the cladding made of a yieldable material and an upper face of the plate opposite the base, said plate being provided with a through hole superimposed with said opening of the conduit to convey the incompressible fluid in the isostatic circuit.
  • an isostatic buffer 11 for pressing tiles comprising a base 12, a plate 13 applied to an upper face 14 of the base 12, and a cladding made of a yieldable material 26 applied to the face 14 to incorporate at least partially the plate 13 and make a pressing surface 40 of the buffer.
  • the base 12 is made of a metal, for example of steel.
  • yieldable material 26 is removed to enable the plate 13 to be viewed, which is preferably made of an elastically deformable material.
  • the plate 13 forms a drilled grille with a plurality of through slots 22. In the preferred embodiment of the invention, the slots 22 are generally cross-shaped.
  • each plate 21 is connected to the adjacent plates 21 by means of connections 24.
  • Each plate 21 has a resting protrusion 32 at the bottom that rests against the upper face 14 of the base.
  • the plates 21 could also have a different shape, for example rectangular, hexagonal, triangular or also circular.
  • the slots could be rectilinear and not cross-shaped, as shown in the figure.
  • the cladding 26 incorporates the plate 12 so as to occupy zones 25 between the plate 13 and the upper face 14 of the base 12.
  • the connections 24 are distanced from the face 14 and below the latter areas 25 are formed that are occupied by the cladding 26.
  • the resting protrusions 32 are tapered and also form zones in which the cladding 26 is arranged between the base 12 and the plate 13.
  • the spaces between the protrusions have a preferably trapezoidal section that widens towards the base. The presence of the areas 25 enables solid anchoring of the cladding 26 to the plate to be obtained and enables the buffer seal to be improved.
  • the upper face 14 of the base 12 is provided with a dip 50 that receives the plate 13 and the cladding 26.
  • a dip 50 that receives the plate 13 and the cladding 26.
  • a raised edge 17 of the dip 50 there is formed at least a groove that forms an undercut to promote hooking of the cladding 26 to the base 12.
  • two perimeter grooves 61 can be made along the edge 17, as indicated in figures 3-4 showing buffer manufacturing steps that will be disclosed below.
  • the edge 17 is dimensioned and shaped so as to withstand the stress to which the buffer is subjected during use.
  • the base 12 comprises at least a conduit 16 that leads by means of an opening 16c onto the upper face 14 of the base 12 to feed incompressible fluid 31 to an isostatic circuit formed between the plate 13 and the yieldable cladding 26.
  • incompressible fluid any oil can be used that is normally used for isostatic buffers in the prior art.
  • the isostatic circuit is formed by a cavity 30 above the plate 13, between the cladding 26 and an upper face 41 of the plate 13 opposite the base 12.
  • the plate 13 is provided with a through hole 20 (clearly visible in figure 5 , where the buffer is shown before the oil is introduced) which is superimposed with the opening 16c of the conduit 16, so as to enable the oil 31 to enter the cavity 30.
  • the oil does not flow below the plate 13, and the plate 13 remains adhering below to the base 12 also during buffer operation.
  • the cavity 30 is formed by deforming the yieldable cladding 26, which rises through the pressure of the oil. This enables a satisfactory isostatic effect to be obtained in pressing the earth loaded on the buffer 11.
  • a detaching element On the upper face 41 of the plate 13 opposite the base 12, preferably, there is applied a detaching element, in order to facilitate the forming of the cavity 30 when the buffer 11 is loaded with oil.
  • a glue is applied to the lower face 42 of the plate 13 facing the base 12 to prevent oil being able to flow below the plate 13.
  • the face 14 of the base, and in particular the bottom 43 of the dip 50 can be covered with glue, to improve the adhesion of the cladding 26 and of the plate 13 to the base.
  • the conduit 16 is suitable for being plugged by a plugging element 15 (shown in figures 3, 4 ) that occupies the hole 20 in the plate 13 during the step of applying the yieldable cladding.
  • the conduit 16 comprises an opening 16b aligned on the opening 16c for extracting/inserting the plugging element 15, and a side opening 16a on a side of the base 12 for introducing the incompressible fluid. It should be noted that the opening 16a could also be absent, and the oil could be introduced directly from the opening 16b.
  • the base 12 comprises two conduits 16, 18 for feeding the incompressible fluid arranged spaced apart near opposite sides of the buffer ( fig. 1 ).
  • the conduit 18 is similar to the hole 16 and comprises an opening that leads onto the face 14 of the base.
  • the plate 13 is provided with another hole 19 that is suitable for aligning on the opening of the conduit 18 on the face 14, to enable the oil to be supplied. This teaching enables optimum positioning of the plate 13 to be obtained during the step of casting the yieldable cladding, in addition to enabling the isostatic fluid to be supplied correctly.
  • the conduit 18 could also be shaped in a different manner from the hole 16.
  • a buffer 11 manufacturing cycle according to the invention will now disclosed with reference to figures 3 to 6 .
  • FIG. 16 In these figures there is shown only the conduit 16, but it must be understood that similar operations are performed at the conduit 18 on the opposite side of the buffer 11.
  • the base 12 is provided, which is provided with the conduit 16 and the dip 50 on the upper face 14 thereof, as disclosed previously.
  • the plugging element 15 is inserted with the end 15a protruding from the bottom 43 of the dip 50 on the face 14 of the base.
  • the plugging element 15 is inserted in a stable manner into the conduit to ensure correct positioning and anchoring of the plate 13 during the step of applying the cladding.
  • the plug 15 can be provided with a thread to be screwed into a corresponding threaded portion of the conduit 16.
  • the plate 13 is then applied with a hole 20 fitted on said end 15a of the plugging element 15, as shown in figure 3 .
  • the head 15a of the plug is flush with the upper surface 41 of the plate 13, to enable the hole 20 to be maintained completely free during the casting step.
  • the plate 13 is still firmly anchored to the base exploiting the plugs 15 (a plug is also provided on the opposite side of the buffer in the conduit 18), and rests with the resting protrusions 32 on the bottom 43 of the dip 50 in the base.
  • the material intended to make the yieldable cladding 26 can be applied to the face 14 of the base so as to incorporate the plate 13 ( fig. 4 ).
  • the material (a rubber or a resin of the type used for the cladding of the isostatic buffers) is applied by casting into the dip 50, after which vulcanisation is performed to form the cladding 26.
  • the cladding is well anchored to the plate, occupying the slots 22 and also the zones below the plate 13, in particular the zones 25 below the connections 24 between adjacent platelets 21 of the plate 13.
  • the plugging element 15 is removed from the conduit 16 through the opening 16b arranged aligned on the opening 16c on the face 14 of the base.
  • the opening 16b arranged on a lower face of the base is then closed with a seal cap 28, as shown in figure 5 .
  • the presence of the plug 15 during the step of applying the cladding 26 enables the hole 20 to be kept free in the plate, beyond the conduit 16 for the subsequent supplying of the oil.
  • a joint 29 can then be applied at the opening 16a on the conduit 16 obtained on a side of the base 12.
  • a known hydraulic unit is attached to supply the oil 31 in the conduit 16.
  • the oil 31 reaches the cavity 30 between the upper face 41 of the plate 13 and the cladding 26, as shown in figures 6 and 7 .
  • a plurality of isostatic chambers are thus created above the plates 21.
  • the chambers are connected together hydraulically and are able to develop the so-called "isostatic effect" to compensate for possible defects in loading the earth.
  • the oil can be loaded at a pressure between 0.5 and 5 bar.
  • the yieldable cladding 26 is applied to the buffer so as to fill almost all the dip 50 on the face 14 thereof of the base, engaging also the undercuts defined by the grooves 61 on the edge 17 of the face 14, to have better anchoring on the base 12.
  • the plate 13 has a collar 120 that surrounds the hole 20 below.
  • the base 12 has a corresponding step widening 116 at the mouth 16c of the conduit. In this manner, when the plate 13 is positioned on the base, the collar 120 and widening 116 coupling performs a function of perfect centring of the plate and maintains the holes 20 well aligned on the conduits 16.
  • the plate has a peripheral edge zone raised from the base and which is provided with a plurality of holes or slots 122 aligned along the edge and more external resting feet 170 on the bottom of the seat in the base.
  • the feet may advantageously have a cylindrical shape.
  • the thin circumferential grooves 61 are refitted by a groove or rounded circumferential depletion 161 to connect the side edge and the upper face of the base that receives the plate 13. It has been found that all this ensures optimum gripping of the yieldable cladding even in the event of diagonal square masonry. Further, machining of the edge is facilitated.
  • the isostatic circuit is arranged entirely above the plate, which in use is positioned solidly in relation to the base. This enables an excellent isostatic effect to be achieved and equal pressing in all parts of the tile to be obtained.
  • the buffer obtained according to the invention is provided with an isostatic circuit that is not in contact with steel parts, which enables the transparency effect to be reduced. Further, the buffer has a satisfactory seal.
  • the buffer is further characterised by great constructional simplicity and low production costs. In order to anchor the plate to the base, it is in fact sufficient to provide holes on the plate 13 that are suitable for receiving the heads of the plugging elements, without the need for particular or costly machinings on the buffer pieces.
  • the buffer can be rubber-coated with various masonry patterns as the machinings are not linked to the pattern.
  • the slots 22 could also be absent, and the isostatic circuit could consist of a single large chamber above the plate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
EP08002726A 2007-02-16 2008-02-14 Isostatische Form zum Pressen von Fliesen und entsprechendes Herstellungsverfahren Withdrawn EP1958745A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000298A ITMI20070298A1 (it) 2007-02-16 2007-02-16 Tampone isostatico per la pessatura di piastrelle e relativo metodo di fabbricazione

Publications (2)

Publication Number Publication Date
EP1958745A2 true EP1958745A2 (de) 2008-08-20
EP1958745A3 EP1958745A3 (de) 2010-12-01

Family

ID=39144388

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08002726A Withdrawn EP1958745A3 (de) 2007-02-16 2008-02-14 Isostatische Form zum Pressen von Fliesen und entsprechendes Herstellungsverfahren

Country Status (2)

Country Link
EP (1) EP1958745A3 (de)
IT (1) ITMI20070298A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600079937A1 (it) * 2016-07-29 2018-01-29 I Dea Re S R L Tampone per la formatura di piastrelle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2762395A (en) * 1953-08-20 1956-09-11 Lamb Rubber Corp Inflatable diaphragm for hydraulic presses
EP0620089A2 (de) * 1993-03-17 1994-10-19 Maris Algeri Verfahren und Form zum isostatischen Pressen, insbesondere zum Herstellen von Keramikfliesen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2762395A (en) * 1953-08-20 1956-09-11 Lamb Rubber Corp Inflatable diaphragm for hydraulic presses
EP0620089A2 (de) * 1993-03-17 1994-10-19 Maris Algeri Verfahren und Form zum isostatischen Pressen, insbesondere zum Herstellen von Keramikfliesen
EP0736363A2 (de) * 1993-03-17 1996-10-09 Maris Algeri Form, insbesondere zum Pressen von Keramikfliesen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600079937A1 (it) * 2016-07-29 2018-01-29 I Dea Re S R L Tampone per la formatura di piastrelle

Also Published As

Publication number Publication date
EP1958745A3 (de) 2010-12-01
ITMI20070298A1 (it) 2008-08-17

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