EP0317720B1 - Verfahren zur Herstellung von Sanitärartikeln, insbesondere Waschtischen, durch Druckgiessen sowie Vorrichtung zur Durchführung dieses Verfahrens - Google Patents

Verfahren zur Herstellung von Sanitärartikeln, insbesondere Waschtischen, durch Druckgiessen sowie Vorrichtung zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP0317720B1
EP0317720B1 EP88115160A EP88115160A EP0317720B1 EP 0317720 B1 EP0317720 B1 EP 0317720B1 EP 88115160 A EP88115160 A EP 88115160A EP 88115160 A EP88115160 A EP 88115160A EP 0317720 B1 EP0317720 B1 EP 0317720B1
Authority
EP
European Patent Office
Prior art keywords
press
mold
mounting plate
pressure
air cushion
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
EP88115160A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0317720A2 (de
EP0317720A3 (en
Inventor
Gerold Dipl.-Ing.(Fh) Spieler
Walter Dipl.-Ing. Schlagenhaft
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 EP0317720A2 publication Critical patent/EP0317720A2/de
Publication of EP0317720A3 publication Critical patent/EP0317720A3/de
Application granted granted Critical
Publication of EP0317720B1 publication Critical patent/EP0317720B1/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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B28B1/265—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor pressure being applied on the slip in the filled mould or on the moulded article in the mould, e.g. pneumatically, by compressing slip in a closed mould
    • B28B1/266—Means for counteracting the pressure being applied on the slip or on the moulded article in the mould, e.g. means for clamping the moulds parts together in a frame-like structure

Definitions

  • the invention relates to a method for the production of sanitary articles, in particular washstands by die casting according to the preamble of claim 1 and a device for carrying out this method according to the preamble of claim 8.
  • Known presses used for the manufacture of washstands for toilets by die-casting ceramic slip have two mold halves delimiting a mold cavity between them, which can be moved together into their closed position by means of clamping plates.
  • the disadvantage of this known Device consists in that the slip within the mold cavity is displaced to the outside as a result of the casting pressure via the joint between the two mold halves, which is favored by a limited flexibility of the special material of the two mold halves designed as a filter element. This not only causes a corresponding burr on the ceramic articles produced, but, depending on the amount of ceramic slip displaced, there are thickness deviations in the end product itself, which very often results in a rejection of the articles produced.
  • presses have been developed for the manufacture of washstands for toilets by die-casting ceramic slip, in which the mold halves can be moved together into their closed position by means of clamping plates.
  • the two clamping plates carrying the mold halves are moved together hydraulically by means of corresponding column guides.
  • a special material is used for the mold halves (EP-A 0 089 317).
  • This is a porous plastic, the porous areas of which are connected to one another in order to allow both pressure build-up and pressure relief during the production process, in particular to remove the residual water from the broken pieces.
  • slip is filled into the mold cavity under pressure, after which the pressure inside the mold is increased to a casting pressure in order to accelerate the formation of the body.
  • the water becomes solidification the body of the body is discharged to the outside.
  • a water film forms between the cullet and the mold due to the residual water present in the mold, which enables the body to be detached from the mold.
  • both mold halves must be pressed together under great pressure.
  • the closing pressure to be applied by the press must in each case be higher than the counter pressure building up within the mold in order to ensure that the mold is closed at all times.
  • the object of the invention is a for the die casting of sanitary ware, in particular washstands and.
  • the device for carrying out this method being distinguished by an extremely simple, robust and easy-to-use structure.
  • a hydraulic feed and readjustment of the clamping plates is dispensed with because an air cushion is used for the infeed movement of the clamping plates that support the mold halves, which allows good adaptation to the geometry of the shape and the course of the separating surface and thus tolerances-related inaccuracies easily can compensate.
  • the mold is spared when carrying out the process, which ensures a long service life of the mold.
  • Due to the delivery of the mold halves in the closed position of the Press elements are used to move the platen into the closed position of the press, which are suspended from a portal frame, and the simplest drives can be used to adjust the press elements relative to each other.
  • the relative adjustment of the two press elements to one another can be carried out by means of a pneumatic piston / cylinder drive.
  • the operability of the press is also simplified accordingly.
  • For the operation of the press only the two clamping plates are moved together in the closed position of the press, which can be done manually or automatically, after which the press elements carrying the two clamping plates are then mechanically locked relative to one another.
  • the mold is then actually pretensioned via the air cushion, to which constant pressure is applied, so that there is no need to readjust the pressure applied to the air cushion.
  • the simple feed movements mean that the column guides required in the presses previously used can be eliminated.
  • the movable platen with the associated press element is expediently suspended on a slide which can be moved along simple guide rails by rolling on a portal of the press.
  • the ceramic slip after the mold has been filled, is kept at a pressure which is lower than the casting pressure, the so-called filling pressure, for a predetermined period of time. It has been shown that a first solidification of the body is achieved at this filling pressure, which is advantageous for sealing the separation gap between the two mold halves. This ensures that the mold material is protected since, when slurry penetrates into the area of the separating surface of the two mold halves, the mold material is gradually destroyed due to the abrasive slip particles. After the first solidification as a result of the filling pressure, the casting pressure is then gradually built up and held for a period of time dependent on the material used and the object to be produced.
  • the press is characterized by very simple components, since only a clamping plate which is firmly connected to a press element is moved on guide rails via a roller-guided slide, for which purpose hardened guide strips with a rectangular cross section can be used.
  • the mechanical locking elements and the air cushion are also mechanically simple and therefore inexpensive components. Has proven to be advantageous as To use locking elements tabs that can be retracted into appropriately designed forks on the other press element and locked with the forks by the simplest locking bolts.
  • the air cushion is expediently arranged between the stationary press element and the clamping plate arranged thereon, because the slide structure and the weight of this additional component can then be reduced. Since the slide is guided on a portal-like frame, a self-contained structure results in connection with the lateral press elements and the press base, which is advantageous for absorbing the forces within the press.
  • the platen which can be adjusted via the air cushion, is guided in parallel into the closed position of the mold by a parallelogram link.
  • An additional articulated mounting of the platen on the parallelogram enables self-alignment of the mold half braced on the platen in the end position, that is, the closed position of the mold, so that a good possibility of adaptation is ensured.
  • a spherical joint is used here as an articulated mounting, which enables the clamping plate to pivot out of a plane perpendicular to the direction of movement of the clamping plate guided in parallel.
  • the press comprises two opposing press elements 3 and 3a, of which the press element 3 is arranged in a stationary manner and at the top through a portal-like structure 4 with a press stand 2 also arranged stationarily on the press base 1 to form a in the plane of the drawing according to Fig. 1 all-round closed press assembly is connected.
  • the interior of the press which is completely freely accessible from the two broad sides (FIG. 1), two clamping plates 5 and 6 are arranged, which serve to accommodate the mold halves not shown in the drawing.
  • the surfaces of the clamping plates 5 and 6 which are to face one another are provided with T-grooves which are continuous over the entire length, as can best be seen from the view in FIG. 2.
  • the carriage 8 is guided by rollers 9 on two guide rails 10 and 11 arranged on the portal-like structure 4.
  • laterally arranged rollers 12 are also provided. This ensures smooth guidance of the platen 5 or the corresponding press element 3a relative to the opposing platen 6, so that the feed movement of the platen 5 into the closed position of the press can even be carried out manually.
  • a pneumatic piston / cylinder unit 13 can be provided, which is fastened on one side to a frame 14 of the slide 8 and on the other hand to the opposite press element 3 with the other end.
  • the opposite clamping plate 6 is arranged on the stationary press element 3, but is movable relative to this press element 3.
  • an air cushion 15, shown in dashed lines in FIG. 1 is arranged between the clamping plate 6 and the stationary press element 3, which is acted upon pneumatically and advances the clamping plate 6 relative to the opposite mold half to close the two mold halves after the press is closed.
  • the maximum feed movement of the air cushion 16 is 20 mm.
  • the parallel movement of the platen 6 in relation to the stationary press element 3 takes place via a parallelogram link 16, which can be seen in FIG. 1 and is suspended at the top of the portal structure 4.
  • the air cushion 16 is covered on the outside by a cover 17. As indicated in FIG.
  • the air cushion 15 extends essentially over the overlap area of the mold half and the associated clamping plate 6.
  • the stationary press element 3 is stiffened equally by struts 7 tapering in a V-shape.
  • the platen 6 is finally articulated on the parallelogram guide 16, so that the platen 6 can be pivoted in the advanced end position from a plane perpendicular to the direction of movement of the platen. This results in an automatic alignment of the clamping plate 6, which is advanced parallel to the end position, as a result of which a uniform surface pressure is achieved over the entire sealing surface of the mold (parting line).
  • the articulated storage takes place here via a pin 25 which has a ball or a spherical part to form a ball joint with the clamping plate at its lower end.
  • the ball joint can also be replaced by another suitable universal joint.
  • a total of four return springs 18 arranged in the corner area are arranged for the return movement of the clamping plate 6.
  • Locking elements 19 are arranged between the two press elements 3 and 3a, namely forks 20 in the corners of the clamping plate 5 and tabs 21 which can be inserted into the forks in the corners of the press element 3.
  • the tabs are 21 fully retracted into the forks 20.
  • Corresponding cross bores in the forks 20 and in the brackets are aligned with one another in such a way that corresponding locking bolts can be inserted laterally into the aligned cross bores and the two press elements 3, 3a are mechanically rigidly locked in their position.
  • shock absorbers on the press which serve as a stop for the end positions of the clamping plates, only one of the shock absorbers 24 being shown in FIG. 1.
  • the pump for the slip supply is shown on the right in FIG. 1, the various feed and return lines likewise being shown at the bottom right, but not are explained in more detail here.
  • a double diaphragm pump is expediently used as the pump.
  • the operation of the press is as follows. To close the press, the platen 5 is advanced relative to the stationary press element 3. In this closed position of the press, the locking elements 19 have moved so far into one another that the transverse bores are aligned with one another. The mechanical locking then takes place by inserting locking bolts into the transverse bores, so that the press elements 3 and 3a are locked to one another in a fixed position.
  • the actual closing movement of the two mold halves takes place in order to close the mold, namely by appropriate pressurization of the air cushion, by means of which the clamping plate 6 is pressed away from the stationary press element 3 in the direction of the clamping plate 5 or the mold half arranged thereon, specifically with constant pressurization, the pressure being essentially dependent on the size of the mold, the sealing surface size of the mold and the component to be produced, but is approximately 5 to 9 bar.
  • the slip is then introduced, the slip is acted upon by the filling pressure, and after a predetermined holding time the pressure rises to the casting pressure, but the fixed pressure between the mounting plates is kept constant over the air cushion. A readjustment of the closing pressure of the mold halves depending on the pressure conditions of the slip within the mold is therefore not necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Producing Shaped Articles From Materials (AREA)
EP88115160A 1987-11-26 1988-09-15 Verfahren zur Herstellung von Sanitärartikeln, insbesondere Waschtischen, durch Druckgiessen sowie Vorrichtung zur Durchführung dieses Verfahrens Expired - Lifetime EP0317720B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873740164 DE3740164A1 (de) 1987-11-26 1987-11-26 Verfahren zur herstellung von sanitaerartikeln, insbesondere waschtischen, durch druckgiessen sowie vorrichtung zur durchfuehrung dieses verfahrens
DE3740164 1987-11-26

Publications (3)

Publication Number Publication Date
EP0317720A2 EP0317720A2 (de) 1989-05-31
EP0317720A3 EP0317720A3 (en) 1989-12-27
EP0317720B1 true EP0317720B1 (de) 1991-03-20

Family

ID=6341368

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88115160A Expired - Lifetime EP0317720B1 (de) 1987-11-26 1988-09-15 Verfahren zur Herstellung von Sanitärartikeln, insbesondere Waschtischen, durch Druckgiessen sowie Vorrichtung zur Durchführung dieses Verfahrens

Country Status (3)

Country Link
EP (1) EP0317720B1 (es)
DE (2) DE3740164A1 (es)
ES (1) ES2021415B3 (es)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9205838D0 (en) * 1992-03-18 1992-04-29 British Ceramic Res Ltd Moulding apparatus
DE9312232U1 (de) * 1993-08-16 1993-10-28 Dorst Masch & Anlagen Presse zum Druckgießen keramischer Formlinge
IT1276660B1 (it) * 1995-04-04 1997-11-03 Siti Spa Procedimento per la formazione di sanitari di forma complessa tramite uno stampo comprendente quattro elementi in resina porosa
DE19901314A1 (de) * 1999-01-15 2000-07-20 Thuringia Netzsch Maschinen Un Keramische Druckgießvorrichtung
DE19935595A1 (de) * 1999-08-02 2001-02-08 Dorst Masch & Anlagen Mehrachsige Druckgußmaschine mit Schwenkachse
EP2110215A1 (en) * 2005-10-14 2009-10-21 Garoll S.r.l. Support equipment for a die for a pressure die casting machine
AT18190U1 (de) * 2022-11-21 2024-04-15 Engel Austria Gmbh Schließeinheit für eine Formgebungsmaschine

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3016884A (en) * 1958-10-31 1962-01-16 Henry H Merriman Fluid expansion unit
US3154009A (en) * 1961-11-13 1964-10-27 Nyder Res And Mfg Inc Patching press
FR1539760A (fr) * 1967-07-11 1968-09-20 Presse destinée à la fabrication de pièces de grande surface en matière plastique
GB1295055A (es) * 1969-08-19 1972-11-01
DE2100868A1 (en) * 1971-01-09 1972-07-27 Siemag Siegener Masch Bau Mould closure/locking mechanism - partic for large blow moulding machines
US3811811A (en) * 1972-03-28 1974-05-21 G Horl Apparatus for supporting relatively movable complemental mold parts
GB1359684A (en) * 1972-08-10 1974-07-10 British Ceramic Res Ass Casting of ceramic articles
US3833333A (en) * 1972-11-06 1974-09-03 G Britten Press construction
US4591472A (en) * 1982-03-17 1986-05-27 Keramik Holding Ag Laufen Process for the preparation of blanks
JPS58208005A (ja) * 1982-05-27 1983-12-03 株式会社イナックス 排泥鋳込み成形方法
DE3448497C2 (de) * 1984-05-08 1997-05-22 Mauser Werke Gmbh Blasformmaschine
IT1196961B (it) * 1986-07-11 1988-11-25 Nassetti Ettore Spa Pressa perfezionata per la produzione di articoli sanitari

Also Published As

Publication number Publication date
EP0317720A2 (de) 1989-05-31
EP0317720A3 (en) 1989-12-27
DE3862103D1 (de) 1991-04-25
ES2021415B3 (es) 1991-11-01
DE3740164A1 (de) 1989-06-08

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