WO1995020474A1 - Presswerkzeug zum isostatischen pressen steilwandiger topfförmiger gegenstände aus keramischem granulat - Google Patents
Presswerkzeug zum isostatischen pressen steilwandiger topfförmiger gegenstände aus keramischem granulat Download PDFInfo
- Publication number
- WO1995020474A1 WO1995020474A1 PCT/EP1995/000262 EP9500262W WO9520474A1 WO 1995020474 A1 WO1995020474 A1 WO 1995020474A1 EP 9500262 W EP9500262 W EP 9500262W WO 9520474 A1 WO9520474 A1 WO 9520474A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- die
- closing body
- male
- male part
- central body
- Prior art date
Links
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
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
- B28B13/0215—Feeding the moulding material in measured quantities from a container or silo
-
- 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
-
- 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
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/30—Feeding material to presses
- B30B15/302—Feeding material in particulate or plastic state to moulding presses
Definitions
- the invention relates to a press tool according to the preamble of claim 1.
- the male part together with the central body and closing body is part of a pre-pressing head which is only placed on the female part and the membrane before the isostatic pressing in order to form a filling space.
- Ceramic granules are shot into this from above, through an annular space of the male part formed outside the tubular closing body.
- the central body is also a tube, through which compressed air for fluidizing and distributing the granules is blown in during the injection. After the injection, the granules in the filling chamber are pre-compressed by a downward movement of the spring-supported patrix.
- the invention is therefore based on the object of further developing a pressing tool for isostatic pressing of objects made of ceramic granules such that large pot-shaped or bowl-shaped objects, the diameter and height of which are of the order of magnitude of 350 mm and more, work flawlessly and with low device and time expenditure can be produced.
- the arrangement of the male below the membrane has the additional advantage when using more than one male in connection with one and the same female and membrane that a male with an object lying upside down on it can be moved out of the working area of the female without that the object should be particularly noted. The object can then be removed while the next object is pressed with another male.
- the molding to be pressed receives a relatively large, unyielding support in the middle of the surface that later forms the top of its base, so that the pressure exerted on the granulate by the membrane is not able to do so during isostatic pressing to leave a disturbing impression in the central area of the object.
- the upper end region of the tubular closing body which is arranged around the head of the central body, cannot be quite as rigid as the head itself because of its necessary axial mobility;
- the support of the granules on the rigid head of the stationary central body beyond the outer edge of this head also has a supporting effect, so that the relatively narrow annular space between the head of the central body and the surrounding end surface of the patrix is apparently bridged by a relatively small number of granulate particles in such a way that only forces act on the closing body which it can withstand without noticeably yielding in the axial direction. Therefore, on the inside of the bottom of objects that have been pressed with a pressing tool according to the invention, there are at most only slight impressions that can be readily accepted in flower pots and the like. Advantageous developments of the invention result from the subclaims.
- FIG. 1 shows a vertical section through a device for pressing flower pots equipped with press tools according to the invention
- FIG. 2 shows the horizontal section II-II in FIG. 1
- FIG. 3 shows an enlarged detail from FIG. 1 with further details in the rest position of the 4 shown a corresponding section in the filling position of the
- Fig. 5 a corresponding cutout in the press end position
- Fig. 6 a corresponding cutout after the pressing process
- Fig. 7 a cutout corresponding to Fig. 3 after the exchange of individual tool parts for tool parts suitable for pressing a smaller object
- Fig. 8 a vertical section through the lower part of a pressing tool according to the invention for pressing wash basins.
- 1 and 2 include a press frame 10 with a base 12, two columns 14 projecting vertically upward from there and a yoke, not shown, arranged further up, which connects the two columns to one another.
- a rotary table 16 is mounted on the base 12 and can be rotated step by step through one of the columns 14 by 180 °.
- a die carrier 18 is guided so that it can be moved up and down.
- Two patrices 20 are fastened on the rotary table 16 and are offset by 180 ° with respect to the column 14 about which the rotary table 16 can be rotated.
- the two patrices 20 are completely the same; they each have a flat end face 22, a steeply conical outer surface 24 and a cylindrical central channel 26, in the upper end region of which a bushing 28 made of particularly wear-resistant material is pressed.
- the two patrices 20 are rotationally symmetrical with respect to a vertical axis A, corresponding to the inner shape of a conventional flower pot.
- each of the two patrices 20 a massive and particularly robust, stamp-like central body 30 is arranged, which is likewise rotationally symmetrical with respect to the associated axis A and circularly cylindrical along the main part of its length.
- the upper end of each central body 30 is formed by a thickened head 32 with a flat top 34, which lies in the same horizontal plane as the end face 22 of the associated male part 20.
- the head 32 Immediately below the top 34, the head 32 has a cylindrical section. This is followed by a conical section with a decreasing diameter.
- Each of the two central bodies 30 is attached to the turntable 16 by means of a strong cross member 36 in such a way that it does not noticeably yield to the pressure acting on its upper side 34 during isostatic pressing.
- Each of the two central bodies 30 also has a foot 38; there the cylindrical main part of the central body merges into a frustoconical lower section with a decreasing diameter.
- a tubular closing body 40 is arranged in each patrix 20 and is guided in the associated central channel 26 so as to be displaceable in the axial direction.
- the central channel 26 is lined with a material with a low coefficient of friction, for example with epoxy resin.
- the tubular closing body 40 is made of high-strength steel; it is preferably hardened and ground on the inside and outside. He has a Upper end 42 with a normal, ie horizontal, plane end face to axis A, which normally - apart from the open position shown in FIG. 4 - lies in the same plane as the end face 22 of the associated male part 20.
- the closing body 40 has also a lower end 44 which is funnel-shaped on the inside and flange-like on the outside. Above this, each closing body 40 has a diametrical slot 46 through which the associated cross member 36 extends with ample axial play, so that the closing body opens between the closed position shown in FIG. 3 and the open position shown in FIG. and can be moved. For these movements, 16 lifting devices 48, for example double-acting hydraulic piston-cylinder units, are installed in the rotary table.
- a common die 50 is associated with the two patrices 20, with which they cooperate alternately.
- the die 50 has the shape of an upside-down pot with a flat bottom surface 52 and a steep, truncated cone-shaped lateral surface 54, the transitions of which to the flat bottom surface 52 and to the lower edge of the die 50 are rounded approximately in a circular arc.
- the matrix 50 is overall rotationally symmetrical with respect to a vertical axis B.
- An inner ring 56 and an outer ring 58 are arranged coaxially with it around its lower edge region. The outer ring 58 overlaps the inner ring 56 and is screwed onto the die carrier 18.
- the die 50 is lined with an elastic membrane 60; this also has a substantially flat bottom 62 and a truncated cone-shaped jacket 64 which widens downward. Furthermore, an outer edge 66 is formed on the membrane 60, which is clamped between the two rings 56 and 58 in such a way that the membrane is sealed to the die carrier 18 is connected.
- Through channels, not shown, provided in the die carrier 18 and in the die 50, which optionally connect to a vacuum source or to a pressure fluid source 3 and 4 as well as according to FIGS. 6 and 7 are held against the die, but according to FIG. 5 is pressed away from it in the direction of the male 20. So that the membrane 60 also seals against the male part 20 in the latter case, the male part is provided with an elastic edge support 68.
- one of the two patrices 20 is assigned to the die 50; the axis A of the relevant male part 20 is aligned with the axis B of the female part 50.
- the rotary table 16 can be locked in each of the two possible positions in which this is the case.
- a shooting tube 70 is arranged, which is displaceably guided in a vertical bore 72 of the base 12 and has a flange 74 at the top with a horizontal upper end face 76, which in the rest position according to FIG. 3 with the top the base 12 is flush so that it does not hinder the rotation of the turntable 16 about the left of the columns 14 shown in FIGS. 1 and 2.
- lifting devices 78 built into the base 12 engage, which in the example shown are likewise double-acting hydraulic piston-cylinder units.
- the device shown serves for pressing ceramic granules 80, which are held ready in a shooting device 82 and can be supplied to the shooting pipe 70 with compressed air via a line 84.
- a complete and closed pressing tool has been formed by one of the two patrices 20 and the die 50 together with the membrane 60 and associated components, there is still no connection between the injection tube 70 and the filling space between patrix 20 and membrane 60.
- a filling channel 86 with an annular cross section is formed, however it is still tightly closed at the top of the head 32 and at the bottom at the foot 38 of the central body 30.
- the tubular closing body 40 By extending the lifting devices 48, the tubular closing body 40 is moved downwards until its lower end abuts the flange 74 of the injection tube 70 and seals it. In this case, an annular passage is opened around the head 32 and around the foot 38 of the central body 30, the cross section of which is approximately as large as the cross section of the filling channel 86 therebetween. As soon as this state, shown in FIG. 4, is reached , Ein manvorrich ⁇ device 82 is actuated so that the filling space formed between the male 20 and the female 50 is filled almost instantaneously with granules 80.
- compressed air which swirls up the granules 80
- air line 89 which opens into the injection tube 70.
- Corresponding air lines preferably open behind each bend in line 84.
- the swirling of the granules 80 on its way into the filling space prevents fine-grained and dust-like components of the granules 80 from entering the filling space separately from its coarser grains, which leads to different densifications during the subsequent would lead to isostatic presses.
- the additionally introduced compressed air supports the movement of the granulate 80 into the filling space, so that the filling time is shortened.
- This filling process takes about two seconds for a press tool for producing a flower pot with a height of approximately 350 mm and a diameter of approximately 300 mm.
- the lifting devices 48 are retracted; as a result, the rohrför closing body 40 returns to its end position, in which its upper end face is flush with the upper end face 22 of the associated male 20 and the upper side 34 of the head 32 of the associated central body 30. Hydraulic fluid is then introduced through the die 50, which forces the membrane 60 away from the die 50 according to FIG. 5 and compresses the granules 80 hydrostatically on one side, so that it forms a pressed object 90.
- the hydraulic fluid is sucked off again, so that the membrane 60, as shown in FIG. 6, again contacts the die 50 essentially over the entire surface.
- the tubular closing body 40 remains in its upper end position; the insertion tube 70, on the other hand, is moved back into its lower end position by retracting the lifting devices 78.
- the die carrier 18 together with die 50 and components attached thereto are lifted off as shown in FIG. 1 and then the turntable 16 is rotated through 180 °.
- the working cycle ends with the freshly pressed object 90 being grasped by a suction cup 92 and being lifted off the male part 20 on which it was formed, as is shown at the top left in FIG. 1.
- the die 50 is lowered onto the male 20 now on the right, and a new work cycle begins.
- FIG. 7 shows that the male parts 20, the female part 50 and the membrane 60 can be replaced by smaller male parts 20 'and the associated male part 50' and the membrane 60 'without having to replace other components by moving between the rotary table 16 and an intermediate plate 94 inserts the male part 20 '.
- FIG. 1 A modification of the pressing tool for pressing wash basins is shown in FIG.
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)
- Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59501684T DE59501684D1 (de) | 1994-01-26 | 1995-01-25 | Presswerkzeug zum isostatischen pressen steilwandiger topfförmiger gegenstände aus keramischem granulat |
EP95907605A EP0690774B1 (de) | 1994-01-26 | 1995-01-25 | Presswerkzeug zum isostatischen pressen steilwandiger topfförmiger gegenstände aus keramischem granulat |
DE19600976A DE19600976C2 (de) | 1995-01-25 | 1996-01-12 | Verfahren und Einrichtungen zum Beschicken eines Preßwerkzeugs mit rieselfähiger Masse |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4402251A DE4402251C1 (de) | 1994-01-26 | 1994-01-26 | Preßwerkzeug zum isostatischen Pressen steilwandiger topfförmiger Gegenstände aus keramischem Granulat |
DEP4402251.4 | 1994-01-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995020474A1 true WO1995020474A1 (de) | 1995-08-03 |
Family
ID=6508738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1995/000262 WO1995020474A1 (de) | 1994-01-26 | 1995-01-25 | Presswerkzeug zum isostatischen pressen steilwandiger topfförmiger gegenstände aus keramischem granulat |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0690774B1 (de) |
CN (1) | CN1123013A (de) |
DE (2) | DE4402251C1 (de) |
ES (1) | ES2113733T3 (de) |
WO (1) | WO1995020474A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0783944A1 (de) | 1996-01-12 | 1997-07-16 | Gebrüder Netzsch Maschinen- und Anlagenbau GmbH | Verfahren und Einrichtungen zum Beschicken eines Presswerkzeugs mit rieselfähiger Masse |
DE102011103745A1 (de) | 2011-05-31 | 2012-12-06 | Sama Maschinenbau Gmbh | Verfahren und Preßwerkzeug zum isostatischen Pressen |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITTV20040118A1 (it) * | 2004-10-20 | 2005-01-20 | Luca Toncelli | Apparecchiatura per la distribuzione in strato sottile di un impasto a base di materiale lapideo o ceramico agglomerato. |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD139109A1 (de) * | 1978-10-02 | 1979-12-12 | Widra Wolf Dietrich | Vorrichtung zum isostatischen pressen von keramischem flachgeschirr |
DE3128348A1 (de) * | 1981-07-17 | 1983-02-03 | Bühler, Eugen, Dipl.-Ing., 8871 Burtenbach | Einrichtung zur herstellung von formlingen aus einer rieselfaehigen masse stichwort: "vorverdichtung im schiesskopf" |
GB2116104A (en) * | 1982-03-02 | 1983-09-21 | Hutschenreuther | A process and an apparatus for the production of a green moulded body of ceramic composition bearing a decoration and a body made thereby |
EP0255719A1 (de) * | 1986-08-04 | 1988-02-10 | Dorst Maschinen und Anlagenbau Otto Dorst und Dipl.-Ing Walter Schlegel GmbH & Co. | Vorrichtung sowie Verfahren zur Herstellung von mit einem seitlichen Fortsatz versehenen tiefenzylindrischen oder kegeligen Formkörpern, insbesondere Henkeltassen |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3128347A1 (de) * | 1981-07-17 | 1983-02-03 | Eugen Dipl.-Ing. 8871 Burtenbach Bühler | Verfahren und einrichtung zur herstellung von formlingen aus rieselfaehiger masse stichwort: "beibehaltung des fuellvakuums beim isostatischen pressen" |
-
1994
- 1994-01-26 DE DE4402251A patent/DE4402251C1/de not_active Expired - Fee Related
-
1995
- 1995-01-25 WO PCT/EP1995/000262 patent/WO1995020474A1/de active IP Right Grant
- 1995-01-25 ES ES95907605T patent/ES2113733T3/es not_active Expired - Lifetime
- 1995-01-25 CN CN95190054A patent/CN1123013A/zh active Pending
- 1995-01-25 DE DE59501684T patent/DE59501684D1/de not_active Expired - Fee Related
- 1995-01-25 EP EP95907605A patent/EP0690774B1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD139109A1 (de) * | 1978-10-02 | 1979-12-12 | Widra Wolf Dietrich | Vorrichtung zum isostatischen pressen von keramischem flachgeschirr |
DE3128348A1 (de) * | 1981-07-17 | 1983-02-03 | Bühler, Eugen, Dipl.-Ing., 8871 Burtenbach | Einrichtung zur herstellung von formlingen aus einer rieselfaehigen masse stichwort: "vorverdichtung im schiesskopf" |
GB2116104A (en) * | 1982-03-02 | 1983-09-21 | Hutschenreuther | A process and an apparatus for the production of a green moulded body of ceramic composition bearing a decoration and a body made thereby |
EP0255719A1 (de) * | 1986-08-04 | 1988-02-10 | Dorst Maschinen und Anlagenbau Otto Dorst und Dipl.-Ing Walter Schlegel GmbH & Co. | Vorrichtung sowie Verfahren zur Herstellung von mit einem seitlichen Fortsatz versehenen tiefenzylindrischen oder kegeligen Formkörpern, insbesondere Henkeltassen |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0783944A1 (de) | 1996-01-12 | 1997-07-16 | Gebrüder Netzsch Maschinen- und Anlagenbau GmbH | Verfahren und Einrichtungen zum Beschicken eines Presswerkzeugs mit rieselfähiger Masse |
DE102011103745A1 (de) | 2011-05-31 | 2012-12-06 | Sama Maschinenbau Gmbh | Verfahren und Preßwerkzeug zum isostatischen Pressen |
DE102011103745B4 (de) | 2011-05-31 | 2020-06-04 | Sama Maschinenbau Gmbh | Verfahren und Preßwerkzeug zum isostatischen Pressen |
Also Published As
Publication number | Publication date |
---|---|
EP0690774A1 (de) | 1996-01-10 |
EP0690774B1 (de) | 1998-03-25 |
DE59501684D1 (de) | 1998-04-30 |
DE4402251C1 (de) | 1995-02-23 |
ES2113733T3 (es) | 1998-05-01 |
CN1123013A (zh) | 1996-05-22 |
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