EP0753396B2 - Device suitable to be used with a pressing apparatus - Google Patents

Device suitable to be used with a pressing apparatus Download PDF

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Publication number
EP0753396B2
EP0753396B2 EP96111231A EP96111231A EP0753396B2 EP 0753396 B2 EP0753396 B2 EP 0753396B2 EP 96111231 A EP96111231 A EP 96111231A EP 96111231 A EP96111231 A EP 96111231A EP 0753396 B2 EP0753396 B2 EP 0753396B2
Authority
EP
European Patent Office
Prior art keywords
plate
pusher
strike plate
pistons
bed 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.)
Expired - Lifetime
Application number
EP96111231A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0753396A3 (en
EP0753396A2 (en
EP0753396B1 (en
Inventor
Renato Bossetti
Ulrico Walchhutter
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.)
Siti SpA Impianti Termoelettrici Industriali Soc
Original Assignee
Siti SpA Impianti Termoelettrici Industriali Soc
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11371978&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0753396(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siti SpA Impianti Termoelettrici Industriali Soc filed Critical Siti SpA Impianti Termoelettrici Industriali Soc
Publication of EP0753396A2 publication Critical patent/EP0753396A2/en
Publication of EP0753396A3 publication Critical patent/EP0753396A3/en
Application granted granted Critical
Publication of EP0753396B1 publication Critical patent/EP0753396B1/en
Publication of EP0753396B2 publication Critical patent/EP0753396B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/026—Mounting of dies, platens or press rams
    • 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
    • B30B11/02—Presses 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/028—Loading or unloading of dies, platens or press rams

Definitions

  • the present invention relates to a pressing device for use in a pressing apparatus for the dry pressing of granular or powdery material.
  • the molded objects can be for example tiles, dishes, refractory bricks, et cetera.
  • the invention furthermore relates to a pressing apparatus that includes the device.
  • a pressing apparatus that includes the device according to the invention has in particular: a main structure for containing the pressing force, which is generally annu lar; actuator devices for performing pressing by virtue of the descent of an upper mold; loading devices for loading the material to be molded into a lower mold; and levelling devices for levelling the upper surface of the material loaded in the lower mold.
  • the loading and levelling devices are generally formed by a single device, termed carriage, that includes a grid that can slide on the mold for loading and a front end that performs levelling during the return stroke.
  • the device according to the invention is in particular of the type that includes: a bed plate for withstanding a pressing force that is discharged onto a lower mold; a base plate that is arranged above the bed plate to support the template of the lower mold; a strike plate that is arranged above the base plate so as to support a lower plunger of the lower mold; pusher pistons for raising the strike plate; pusher cylinders for the pusher pistons, which are rigidly connected to the bed plate; a flow splitter for distributing the same flow to each one of the pusher cylinders, so that the strike plate can be moved vertically, parallel to itself, by virtue of passages of flow through the flow splitter.
  • bed plate commonly references a body that is thick enough to absorb the pressing force without permanent deformations.
  • the bed plate is normally installed below all the molding devices, directly in contact with the pressing apparatus and in particular with the structure for containing the pressing forces.
  • base plate references a plate that remains fixed to the bed plate during all pressing cycles and is removed only when the mold is changed. By supporting the template and the strike plate, the base plate allows to remove in a single operation the entire set of lower molds without substantially modifying the relative positions of the various components.
  • strike plate commonly references a plate that can move vertically and supports the lower plungers, so that the plungers can be moved to perform the loading and mold extraction operations.
  • the strike plate remains motionless in the lower position of its vertical stroke, so that the pressing force absorbed by the strike plate can be discharged onto the bed plate.
  • the strike plate rises until the top of the lower plunger reaches the level of the template, so that the carriage can push the molded part forward.
  • the strike plate does not descend to the bottom of its stroke but stops at a certain intermediate level, so that it is possible to load the lower mold with a preset amount of material, according to the position in which the strike plate has stopped.
  • the precision of the positioning of the strike plate in this step is decisive to determine the amount of powder that is loaded in the various parts of the mold and therefore to ensure a satisfactory final result.
  • the pusher piston-and-cylinder units for lifting the strike plate with respect to the bed plate are generally four and are arranged at the four corners of the strike plate. They allow to effectively control parallelism between the strike plate and the bed plate, since they are all fed by identical flows generated by a flow splitter. For a more detailed description of these units, reference is made to European patent application no. 0 547 305 in the name of the same Applicant.
  • flow splitter references a device that is capable of generating multiple flows that are all identical to each other. However, it is evident that an equivalent but far less practical arrangement could be to use a flow splitter that generates mutually different flows and piston-and-cylinder units that have proportionally different cross-sections.
  • a flow splitter is provided so as to receive a single liquid flow as feed and split this flow into a plurality of output flows that are all identical to one another.
  • a flow splitter is generally shown schematically by virtue of a plurality of positive-displacement pumps whose axes are all mechanically connected to each other, so that all the pumps must rotate at the same speed.
  • an equivalent flow splitter can be arranged providing a distinct proportional valve and a distinct encoder for controlling the movements of the actuation means commanded by each flow, so that all the flows will be the same because each proportional valve can be adjusted in order that all encoders move syncroneously.
  • the proportional valves can be adjusted so that all provide substantially the same flow independently from the stress occurred to each actuation means, i.e. independently from the pressure of each flow.
  • a preferred embodiment of a flow splitter includes a separate feeder piston for each one of the pusher piston-and-cylinder units.
  • the feeder pistons are mechanically and rigidly connected to each other, and each one is contained in a separate feeder cylinder.
  • the feeder cylinders are mechanically and rigidly connected to each other. More preferably, the feeder pistons are hollow, so that the pusher pistons are fed by virtue of the cavities.
  • the movement of the rods is of two kinds: a vertical one, so as to move the strike plate vertically, and a rotary one, so as to tum the rods about their own axis in order to disengage the strike plate during mold changing. Engagement and disengagement of the strike plate generally occur with a dovetail or T-shaped coupling, which tends to wear out with use, especially at the corners.
  • the fact that the rod movement devices are arranged in the pit entails evident problems for all tuning and maintenance work. It is not possible to check operation, but the entire unit must be disassembled from below.
  • the device according to the invention includes a bed plate 10 for withstanding a pressing force that is discharged onto a lower mold 11.
  • the lower mold 11 is formed laterally by the template 12 and on the bottom by the lower plungers 13.
  • a base plate 14 is arranged above the bed plate 10 and supports the template 12 by virtue of the pistons 15.
  • the base plate 14 is removable, so that by removing the base plate 14 it is also possible to remove the parts that are located above and particularly the strike plate 16 and the lower mold 11.
  • the base plate 14 can be fixed to the bed plate by virtue of the screws 17, so that the base plate 14 remains fixed to the bed plate 10 during each pressing cycle but can be removed for mold changing.
  • the strike plate 16 supports the plungers 13 of the lower mold 11. Generally, the plungers 13 are rigidly coupled to the strike plate magnetically.
  • the pusher pistons 18 have the task of lifting the strike plate 16.
  • the pistons 18 are contained in cylinders 19, which are rigidly connected to the bed plate 10.
  • the cylinders 19 are contained in holes 20 that are formed in the bed plate 10.
  • the strike plate 16 is supported by the pusher pistons 18 by virtue of a simple support coupling 21. In this manner it is possible to allow free accidental movement of the strike plate 16 in a direction that is not parallel to the bed plate 10. This can occur, for example, as a consequence of a jamming that blocks the mutual sliding of the lower plungers and of the template or due to the presence of air bubbles in the oil, et cetera.
  • the length of the pusher pistons 18 is such as to allow to lower the top 22 of the pistons 18 to a level that is not higher than the upper surface 23 of the bed plate 10. In other words, the pistons 18 can retract fully into the bed plate 10.
  • the support coupling 21 is provided by virtue of an extension 24 of the strike plate 16 through the base plate 14.
  • the base plate 14 has openings 25 to allow the passage of the extensions 24.
  • Each extension 24 is fixed in a seat 26 that is provided in the strike plate 16.
  • the coupling between the extension 24 and the seat 26 has a certain play, so as to allow a certain free horizontal movement between the extension 24 and the seat 26 before the tightening of the bolt 9 from above. Rotation of the extension 24 is prevented by the pin 8. In this manner it is possible to automatically adjust the horizontal position of the extensions 24.
  • the bolts 9 are in fact tightened after resting the strike plate on the pusher pistons 18, so that the extensions 24 are automatically arranged in the correct position.
  • the support coupling 21 is of the self-centering type, and this characteristic is provided by virtue of the coupling of a concave profile 27 with a convex profile 22.
  • the concave profile is rigidly coupled to the strike plate 16 and the convex profile 22 is rigidly coupled to the top of the pistons 18.
  • the convex profile 22 is spherical and the concave profile 27 is conical or spherical.
  • the concave profile 27 and/or the convex profile 22 are formed with an insert made of hard material that is rigidly coupled to the strike plate 16 and/or to the piston 18 by virtue of a forced coupling.
  • the insert is inserted inside the piston 18; with particular reference to Figure 5, the insert is fitted externally, on the top of the piston 18. In all cases, the forced coupling can be provided by hot keying.
  • Each cylinder-and-piston unit has an upper chamber 28 and a lower chamber 29.
  • the lower chamber 29 of each unit is fed by the flow splitter 30, which in the schematic illustration of Figure 6 is actuated by the piston 31 and produces four identical flows by virtue of the four pistons 32.
  • a suction device 33 can be connected to each upper chamber 28 of the cylinder-and-piston units, so as to draw gas from the lower chamber 29, through the gasket 34.
  • the suction device 33 is preferably a Venturi device.
  • the suction device 33 is connected to the upper chambers 28 of the pusher cylinders 19 by virtue of a valve 35 that is capable of cutting off the suction device 33 and of sending pressurized air to the upper chambers 28.
  • the suction device 33 is connected to the upper chambers 28 by virtue of a decanting device 36 to decant aspirated oil traces from the upper chambers.
  • the encoder 6 detects a position of the flow divider 30 and consequently detects a position of the strike plate 16. It is so possible to adjust a proportional valve 7 according to the position signal detected by encoder 6.
  • Each one of the cylinders 19 is accommodated in the bed plate 10 by virtue of a hole 20 that is formed in the bed plate 10.
  • Each cylinder 19 has an upper abutment 37 that is arranged so that each one of the pistons 18 can pass through a hole 38 of the abutment 37.
  • each cylinder 19 has an external abutment 39 that is suitable to engage a complementary abutment that is formed on the bed plate 10.
  • the external abutment 39 is a wider region of the upper part of the cylinder 19
  • the complementary abutment is a wider region of an upper part of the hole 20 in the bed plate 10.
  • the cylinder 19 is fixed to the bed plate 10, inside the hole 20, by virtue of a first threaded part 40 that engages the wider region 39 formed in the upper part of the cylinders 19.
  • the abutment 27 is formed by a removable flange 41.
  • the thickness of the cylinder 19 is, in this case, sufficient to allow to fix the flange 41 on the cylinder 19 by virtue of a second threaded part 42 that passes through the flange 41 and is screwed in a thread that is formed in the cylinder 19.
  • the upper surface 43 of the abutment and/or of the bolts 42 is at a level that is not higher than the upper surface 23 of the bed plate 10.
  • the cylinders 19 are provided with the abutment 37, which has already been fixed, and are inserted in the bed plate 10 from above.
  • the unit formed by the cylinder 19 and by the piston 18 is of the double-acting type, so as to act by virtue of the upper chamber 28 and the lower chamber 29. In this manner, each unit 18 and 19 can be assembled and tested in the workshop prior to installation. Accordingly, upon installation it is sufficient to insert the unit in the bed plate 10.
  • the side wall of the cylinder 19 has a substantially vertical first hole 44 combined with a substantially horizontal hole 45, in order to feed the upper chamber 28 from below, preferably with a gas, generally air.
  • the lower wall of the cylinder 19 has a second substantially vertical hole 46 for feeding the lower chamber 29 with a liquid, generally oil, from below.
  • Atractioncylinder47 isrigidlyconnectedtothe bed plate 10 by virtue of the screws 48.
  • a traction piston 49 is inserted in the traction cylinder 47 and has traction devices 50 to engage the strike plate 16 by traction and disengage it on command.
  • the traction devices 50 preferably include a rotating part 51 with an enlarged top, so that a first rotation angle of the rotating part 51 allows to engage the strike plate 16, as shown with particular reference to Figure 8, and so that a second rotation angle allows to disengage the strike plate 16, as shown with particular reference to Figure 9.
  • the first rotation angle and the second rotation angle are displaced by 90° with respect to each other.
  • the enlarged end 51 has a hemispherical shape that is truncated on two opposite sides 52 and 53.
  • the rotating part 51 includes a rod 54 that has a square cross-section and passes through the body of the traction piston 49.
  • the rod 54 is actuated from below by virtue of an actuator device 55 that is a hydraulic rotary actuator with limited rotation.
  • the traction cylinder-and-piston unit is of the double-acting type and has an upper chamber 56 that is fed with a liquid and a lower chamber 57 that is fed with a fluid at a lower pressure, preferably constituted by air.
  • the cover 58 is formed so as to be monolithic with the strike plate 16 and the seat of the traction devices 50 is machined on the strike plate 16 from below. In this manner, the ability of the strike plate 16 to support the lower plungers is greater.
  • the method for replacing the molds is as follows:
  • the traction piston 49 is raised by introducing air into the lower chamber 57 and discharging oil from the upper chamber 56.
  • a rotation of the rotating part 51 and of the rod 54 through 90° allows to arrange the traction devices 50 in a rotated position that is suitable to engage the strike plate 16.
  • a lowering of the traction piston 49 allows to engage the strike plate 16. This lowering is performed by feeding pressurized oil to the upper chamber 56 and by discharging air from the lower chamber 57 of the traction piston 49.
  • the traction piston can retract inside the bed plate, so as to speed up mold changing operations.
  • the pusher cylinder-and-piston units can be checked before installation in the bed plate; in particular, it is possible to check hydraulic tightness, movement, et cetera. Insertion in the bed plate is furthermore particularly simple.
  • Worn units can be replaced easily, without havIng to perform work on the bed plate.
  • the units can be fed simply from below, by virtue of pipes, avoiding the need to produce long horizontal holes in the bed plate.
  • the abutment arranged above the cylinder prevents the accidental escape of the pistons during transport.
  • Air bubbles that are present In the oil can be eliminated by suction through the gaskets. Air bubble elimination is very important, since precision in operation is based on the incompressibility of the oil and therefore on the parallel movement of the four pusher pistons.
  • a Venturi suction device allows to provide an appreciable degree of vacuum in a simple manner.
  • a decanting device allows to separate the oil from the air, sending only air to the suction device.
  • the extension of the strike plate through the base plate allows the pusher pistons to reach the strike plate even with a reduced length of the pusher pistons, which can thus retract more easlly fully inside the bed plate.
  • the base plate can furthermore be easily removed together with the overlying parts for mold changing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Casting Devices For Molds (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
EP96111231A 1995-07-14 1996-07-12 Device suitable to be used with a pressing apparatus Expired - Lifetime EP0753396B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI951519 1995-07-14
ITMI951519A IT1275537B (it) 1995-07-14 1995-07-14 Dispositivo atto ad essere utilizzato con un apparato di pressatura

Publications (4)

Publication Number Publication Date
EP0753396A2 EP0753396A2 (en) 1997-01-15
EP0753396A3 EP0753396A3 (en) 1997-10-29
EP0753396B1 EP0753396B1 (en) 2001-12-19
EP0753396B2 true EP0753396B2 (en) 2006-03-01

Family

ID=11371978

Family Applications (2)

Application Number Title Priority Date Filing Date
EP96111231A Expired - Lifetime EP0753396B2 (en) 1995-07-14 1996-07-12 Device suitable to be used with a pressing apparatus
EP96111232A Expired - Lifetime EP0753397B1 (en) 1995-07-14 1996-07-12 Device suitable to be used with a pressing apparatus

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP96111232A Expired - Lifetime EP0753397B1 (en) 1995-07-14 1996-07-12 Device suitable to be used with a pressing apparatus

Country Status (4)

Country Link
EP (2) EP0753396B2 (it)
DE (2) DE69618094T2 (it)
ES (2) ES2183897T3 (it)
IT (1) IT1275537B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2451576C1 (ru) * 2010-12-08 2012-05-27 Открытое акционерное общество "Композит" (ОАО "Композит") Способ горячего прессования твердых труднодеформируемых порошковых материалов и устройство для его осуществления

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1314073B1 (it) * 1999-11-19 2002-12-04 Siti Dispositivo per la pressatura di un materiale granulare o polverulento,apparato e procedimento impieganti il dispositivo
ES1046772Y (es) * 2000-03-06 2001-07-01 Ind Cooperadora Del Azulejo S Molde hidraulico autonomo
US6655268B2 (en) * 2001-10-31 2003-12-02 The Boeing Company Compact hot press
ITMI20082057A1 (it) * 2008-11-19 2010-05-20 Martinelli Ettore Srl Apparato di pressatura per piastrelle
RU2501629C1 (ru) * 2012-08-21 2013-12-20 Открытое акционерное общество Акционерная холдинговая компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (ОАО АХК "ВНИИМЕТМАШ") Пресс для спрессовывания порошковых материалов

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3926854A1 (de) † 1989-08-15 1991-02-21 Sacmi Vorrichtung in keramik-pressen zum fuellen der pressformen mit pulverfoermigem pressgut

Family Cites Families (11)

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FR2288569A2 (fr) * 1974-10-24 1976-05-21 Chausson Usines Sa Dispositif de presse a outils rapidement interchangeables
SE423604B (sv) * 1978-04-18 1982-05-17 Hakan Sallander Anordning for fastspenning av ett tvadelat verktyg i en maskin sasom en press eller liknande
JPS55140512A (en) * 1979-04-20 1980-11-04 Mitsuishi Fukai Iron Works Molding machine used for brick* etc*
DE3775813D1 (de) * 1986-04-18 1992-02-20 Bruderer Ag Presse mit einem gestell und einem aus wenigstens zwei teilen bestehenden werkzeug.
DE3919372A1 (de) * 1989-06-14 1990-12-20 Schuler Gmbh L Druckwange im ziehapparat einer presse
KR0180557B1 (ko) * 1990-12-26 1999-03-20 후까이 히로도시 벽돌 압착기
ITMI913405A1 (it) * 1991-12-18 1993-06-18 Siti S P A Soc Imp Termoelettr Procedimento per la pressatura a secco di un materiale granulare o polverulento,dispositivo ed apparato relativi
DE9203546U1 (de) * 1992-03-17 1993-07-22 Komage - Gellner & Co. Maschinenfabrik KG, 54427 Kell Vorrichtung zum Pressen von Formteilen aus einer feinkörnigen Masse
JP3045436B2 (ja) * 1992-08-06 2000-05-29 株式会社神戸製鋼所 タイヤ加硫機の金型装着装置
DE4343336B4 (de) * 1993-12-18 2007-06-21 Dieffenbacher Gmbh + Co. Kg Hydraulische Tiefzieheinrichtung
DE4425565C2 (de) * 1994-07-20 1997-07-03 Dorstener Maschf Ag Mehrsäulenpresse

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3926854A1 (de) † 1989-08-15 1991-02-21 Sacmi Vorrichtung in keramik-pressen zum fuellen der pressformen mit pulverfoermigem pressgut

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Stampo multiplo universale (drawing) †

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2451576C1 (ru) * 2010-12-08 2012-05-27 Открытое акционерное общество "Композит" (ОАО "Композит") Способ горячего прессования твердых труднодеформируемых порошковых материалов и устройство для его осуществления

Also Published As

Publication number Publication date
EP0753397B1 (en) 2002-09-25
ITMI951519A0 (it) 1995-07-14
DE69618094T2 (de) 2002-08-14
DE69623878T2 (de) 2003-07-31
EP0753396A3 (en) 1997-10-29
ITMI951519A1 (it) 1997-01-14
EP0753396A2 (en) 1997-01-15
IT1275537B (it) 1997-08-07
EP0753397A2 (en) 1997-01-15
EP0753396B1 (en) 2001-12-19
ES2164810T3 (es) 2002-03-01
ES2164810T5 (es) 2006-10-16
EP0753397A3 (en) 1997-10-29
DE69623878D1 (de) 2002-10-31
DE69618094D1 (de) 2002-01-31
ES2183897T3 (es) 2003-04-01

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