EP0255719A1 - Dispositif et procédé pour fabriquer des pièces moulées creuses de forme conique ou cylindrique, en particulier tasses avec une anse - Google Patents

Dispositif et procédé pour fabriquer des pièces moulées creuses de forme conique ou cylindrique, en particulier tasses avec une anse Download PDF

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Publication number
EP0255719A1
EP0255719A1 EP87111262A EP87111262A EP0255719A1 EP 0255719 A1 EP0255719 A1 EP 0255719A1 EP 87111262 A EP87111262 A EP 87111262A EP 87111262 A EP87111262 A EP 87111262A EP 0255719 A1 EP0255719 A1 EP 0255719A1
Authority
EP
European Patent Office
Prior art keywords
mold
handle
filling
membrane
cup
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
EP87111262A
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German (de)
English (en)
Other versions
EP0255719B1 (fr
Inventor
Hilmar Bruno Suffa
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.)
DORST Technologies GmbH and Co KG
Original Assignee
DORST Technologies GmbH and Co KG
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 DORST Technologies GmbH and Co KG filed Critical DORST Technologies GmbH and Co KG
Publication of EP0255719A1 publication Critical patent/EP0255719A1/fr
Application granted granted Critical
Publication of EP0255719B1 publication Critical patent/EP0255719B1/fr
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
    • B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses

Definitions

  • the invention relates to a device according to the preamble of patent claim 1 and a method according to the preamble of patent claim 9.
  • the pressing tool used for this has a stamp-like inner pressing mold which carries a membrane for isostatic pressing.
  • the upper press mold is formed from two press halves that can be moved laterally.
  • a core which can also be used in one of the press halves and also carries a membrane is also used for shaping the handle. It is therefore a very complex pressing tool, which has the main disadvantage that the upper press mold for forming the outside of the cup is divided, so that after the molding process a seam remains on the cup, which are removed in a separate operation got to. Such a seam remains visible even after the most careful cleaning work after glazing.
  • the object of the invention is to enable the manufacture of handle cups in a single operation in a simple manner and with reproducible wall thicknesses and without the risk of cracking and damage.
  • the invention is characterized in that the outer mold is undivided, so that the formation of a seam and the associated rework are eliminated.
  • a one-piece membrane is used both for shaping the handle and for shaping the cup body simplifies manufacture considerably. Since the outer mold, in the filling position, defines a filling or evacuation gap along its outer circumference with a filling ring, filling is carried out under vacuum, so that metering devices can be dispensed with. Since the outer mold is moved in the axial direction of the molded body against the inner mold to close the mold cavity, the ceramic material located in the mold cavity is statically pre-pressed in the direction of the punch movement.
  • This static pre-pressing is essential because here especially in the area of the floor and the curve in the transition from the floor to the cup walls, the path that the membrane has to make during isostatic pressing is shortened. This is very important because with wide diaphragm paths, especially because of the complicated shape in the transition area from the floor to the cup walls, otherwise uneven wall thicknesses would result due to the existing curves. In the rounded areas, there would be a thickening due to a different resistance to the straight areas, and in particular in the more flat areas, the thickness of the shaped body would be weakened. In addition, tensions could otherwise arise in the membrane, which would lead to damage to the molded article during removal from the mold.
  • the invention thus allows the production of cups with precisely controlled wall thicknesses and in a reproducible manner. The risk of damage is largely excluded even during demolding.
  • a supporting wedge is expediently used, the shaped surface of which is adapted to the upper edge of the handle.
  • the support wedge then delimits the actual handle area with the opposite membrane.
  • the support wedge is mounted in the filling ring.
  • the support wedge From a deformation-resistant and thus rigid material, in particular steel. If a material with an elastic component or a plastically deformable material is used for the support wedge, the support wedge would be compressed during the isostatic pressing, which could lead to damage to the handle in the region of the support wedge during removal from the mold.
  • the membrane in the area of the handle so that the membrane surfaces forming the side walls of the handle taper from the inside to the outside in the manner of a cone.
  • the shaped handle has essentially straight side faces, so that the membrane can be removed without damaging the handle.
  • the inner punch at its lower end with a circumferential bevel, which serves as a stop surface for the membrane pressed in during isostatic pressing. Because of this stop, the membrane is moved together evenly in the cylindrical or conical region of the molded body during isostatic pressing, thus achieving uniform wall thicknesses of the cup body over the circumference.
  • the mold cavity is first filled by vacuum filling, so that a metering device can be dispensed with, and the ceramic mass distributed in the mold cavity is subjected to a static compression molding when the mold is closed, which means that the path for the membrane during isostatic pressing in Bottom area of the mold cavity is reduced.
  • the isostatic pressing is carried out by applying pressure medium to the back of the membrane.
  • the press tool shown in Fig. 1 essentially comprises an upper outer die 1 and a lower inner die 3 formed by an inner die 2, the one with 4 be between them drawn mold cavity for the production of a shaped body, namely a cup provided with a handle.
  • the outer mold 1 is contoured according to the outside of the cup to be manufactured, including the handle.
  • the shape of the inner stamp 2 corresponds to the inner shape of the cup.
  • the inner mold 3 further comprises a support wedge 5, particularly in the case of the manufacture of a cup, in which the handle is arranged offset downwards relative to the upper cup edge.
  • the supporting wedge 5 is received in a recess 6 of a filling ring, generally designated 7.
  • the filler ring 7 itself has at least one feed channel 8 for the ceramic mass and at least one evacuation channel 9.
  • a feed channel 8 is provided for the evacuation.
  • the filler ring 7 has two evacuation channels 9, as shown in FIG. 2.
  • the outer die 1 is attached in a manner shown in the drawing, but not explained here for reasons of clarity, to a die 10, which is only indicated schematically, with which the die 1 is relative to the inner die 2 in the direction of the axis of the die and thus of the hollow body is movable.
  • the outer mold carries a membrane 11 of known type on the molding surface, which is pinched and fixed at 13 on its outer edge 12.
  • the membrane used for isostatic pressing is connected on its underside via channels 14 to a suitable pressure medium source, not shown, so that the membrane can be pressurized from the underside for the isostatic pressing process.
  • the pressure medium channels 14 are provided both in the cylindrical region of the press mold and on the bottom of the press mold and in the handle region.
  • the inner stamp 2 is fastened in the illustrated embodiment according to FIG. 1 on a stamp plate 15 by means of a screw connection 16, so that the inner stamp can be quickly and easily replaced with another inner stamp if required can.
  • the stamp plate 15 itself is seated on a support plate 17 which is fixed to the press.
  • lifting devices in the form of pressure medium pistons are received, by means of which the filler ring 7 can be raised relative to the support plate 17. Only one of the lifting devices 18 is shown in FIG. 1.
  • FIG. 1 shows the pressing tool in the filling position, in which the filling ring 7 is raised relative to the support plate 17 as a result of the lifting devices 18 and together with the outer pressing mold 1 relative to the inner punch 2, a narrow filling gap designated 19 and one from FIG. 1 not shown, but limited in FIG. 2, evacuation gap 20.
  • the filling gap 19 extends over the circle segment designated F, whereas the evacuation gap extends essentially over the remainder of the circumference, as identified by E.
  • Fig. 1 shows the pressing tool after closing the mold, but before the isostatic pressing.
  • the membrane for the production of cup with handle is integrally formed. It is largely rotationally symmetrical to form the cup and is formed only in the region of the handle designated by 21 with a radial extension for shaping the handle.
  • the radial extension 21 is expediently conical in a section perpendicular to the axis A-A of the shape, the cone widening from radially outside to radially inside.
  • the support wedge 5 which corresponds to the width of the handle in the upper region, is adapted to the shape of the upper edge 22 of the handle and, together with the inner punch 2 and the membrane 11, delimits the mold cavity.
  • the inner punch 2 is circumferential following the upper edge 23 of the mold cavity with a circumferential bevel 24 formed, which serves as a run-up surface for the upper mold 1.
  • the membrane 11 is formed at 25 with a corresponding circumferential inclined surface.
  • the operation of the press tool is as follows: for the purpose of filling the mold cavity 4, the upper press mold 1 is in the position relative to the inner punch 2 as shown in the left-hand illustration in FIG. 1.
  • the filler ring 7 is also raised as a result of the lifting devices 18, so that a filling gap and an evacuation gap are formed in the manner described above. If negative pressure is now applied to the channels 9, ceramic mass is filled into the mold cavity 4 from the feed channel 8.
  • the stamp 10 is lowered so that the filling ring 7 is also moved downward until it strikes against the upper surface 26 of the support plate 17, which acts as a stop surface. This position is shown in the right half in FIG. 1.
  • the ceramic mass Due to this movement of the stamp 10 and the associated downward movement of the upper outer die 1, the ceramic mass has been statically pressed in the mold cavity in the direction of the stamp movement S, with the membrane 11 still during this process pressure medium has not been applied to its underside.
  • the isostatic pressing takes place, for which purpose pressure medium is supplied via the channels 14 to the back of the membrane 11 in the closed position of the press mold, as shown in FIG. 1 on the right.
  • the pressure medium is discharged again, so that the membrane 11 relaxes.
  • the molded cup can now be removed or ejected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
EP87111262A 1986-08-04 1987-08-04 Dispositif et procédé pour fabriquer des pièces moulées creuses de forme conique ou cylindrique, en particulier tasses avec une anse Expired - Lifetime EP0255719B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3626365 1986-08-04
DE19863626365 DE3626365A1 (de) 1986-08-04 1986-08-04 Vorrichtung sowie verfahren zur herstellung von mit einem seitlichen fortsatz versehenen tiefenzylindrischen oder kegeligen formkoerpern, insbesondere henkeltassen

Publications (2)

Publication Number Publication Date
EP0255719A1 true EP0255719A1 (fr) 1988-02-10
EP0255719B1 EP0255719B1 (fr) 1990-10-24

Family

ID=6306663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111262A Expired - Lifetime EP0255719B1 (fr) 1986-08-04 1987-08-04 Dispositif et procédé pour fabriquer des pièces moulées creuses de forme conique ou cylindrique, en particulier tasses avec une anse

Country Status (2)

Country Link
EP (1) EP0255719B1 (fr)
DE (2) DE3626365A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0533142A1 (fr) * 1991-09-16 1993-03-24 Erich Netzsch GmbH & Co. Holding KG Procédé pour la fabrication de récipients en céramique munis d'anses et moule de presse pour le pressage de tels récipients
WO1995020474A1 (fr) * 1994-01-26 1995-08-03 Erich Netzsch Gmbh & Co. Holding Kg Moule de compression isostatique pour la production d'articles en forme de pots a paroi abrupte a partir de granule ceramique
CN1039393C (zh) * 1993-04-08 1998-08-05 埃里希内奇控股公司 等静压压制带柄容器的模具
EP2774736A3 (fr) * 2013-03-08 2015-10-07 Dorst Technologies GmbH & Co. KG Agencement de presse et procédé de pressage d'une pièce pressée
WO2016008462A1 (fr) * 2014-07-15 2016-01-21 Dorst Technologies Gmbh & Co. Kg Dispositif de presse et procédé pour presser une pièce pressée
CN113459574A (zh) * 2021-06-30 2021-10-01 江美玲 一种用于粉末药片的压合取出机构

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4032316C1 (fr) * 1990-10-11 1992-02-13 Erich Netzsch Gmbh & Co Holding Kg, 8672 Selb, De

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2637231A1 (de) * 1976-08-18 1978-02-23 Dorst Keramikmasch Presse zum pressen keramischen pulvers zu topfartigen formkoerpern
US4087221A (en) * 1977-01-31 1978-05-02 Remington Arms Company, Inc. Apparatus for molding powder metal parts
DE2935157A1 (de) * 1979-08-31 1981-03-12 Laeis-Werke Ag, 5500 Trier Presse fuer formteile.
EP0043019A1 (fr) * 1980-07-01 1982-01-06 Keramikmaschinen-Bau Dorst Outil de pressage pour la fabrication de corps pressés en forme de plat, en particulier des plaques, des assiettes, des tasses, des plats ou analogue en matière pulvérulente, de préférence en matière céramique
US4350486A (en) * 1979-12-04 1982-09-21 Laeis-Werke Ag Press for ceramic moldings

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2637231A1 (de) * 1976-08-18 1978-02-23 Dorst Keramikmasch Presse zum pressen keramischen pulvers zu topfartigen formkoerpern
US4087221A (en) * 1977-01-31 1978-05-02 Remington Arms Company, Inc. Apparatus for molding powder metal parts
DE2935157A1 (de) * 1979-08-31 1981-03-12 Laeis-Werke Ag, 5500 Trier Presse fuer formteile.
US4350486A (en) * 1979-12-04 1982-09-21 Laeis-Werke Ag Press for ceramic moldings
EP0043019A1 (fr) * 1980-07-01 1982-01-06 Keramikmaschinen-Bau Dorst Outil de pressage pour la fabrication de corps pressés en forme de plat, en particulier des plaques, des assiettes, des tasses, des plats ou analogue en matière pulvérulente, de préférence en matière céramique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0533142A1 (fr) * 1991-09-16 1993-03-24 Erich Netzsch GmbH & Co. Holding KG Procédé pour la fabrication de récipients en céramique munis d'anses et moule de presse pour le pressage de tels récipients
CN1039393C (zh) * 1993-04-08 1998-08-05 埃里希内奇控股公司 等静压压制带柄容器的模具
WO1995020474A1 (fr) * 1994-01-26 1995-08-03 Erich Netzsch Gmbh & Co. Holding Kg Moule de compression isostatique pour la production d'articles en forme de pots a paroi abrupte a partir de granule ceramique
EP2774736A3 (fr) * 2013-03-08 2015-10-07 Dorst Technologies GmbH & Co. KG Agencement de presse et procédé de pressage d'une pièce pressée
WO2016008462A1 (fr) * 2014-07-15 2016-01-21 Dorst Technologies Gmbh & Co. Kg Dispositif de presse et procédé pour presser une pièce pressée
CN106536141A (zh) * 2014-07-15 2017-03-22 道尔斯特技术有限两合公司 用于挤压成挤压件的挤压装置和方法
CN106536141B (zh) * 2014-07-15 2021-04-09 道尔斯特技术有限两合公司 用于挤压成挤压件的挤压装置和方法
CN113459574A (zh) * 2021-06-30 2021-10-01 江美玲 一种用于粉末药片的压合取出机构

Also Published As

Publication number Publication date
EP0255719B1 (fr) 1990-10-24
DE3626365A1 (de) 1988-02-11
DE3765717D1 (de) 1990-11-29

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