EP4292789A1 - Moule de coulée sous pression - Google Patents

Moule de coulée sous pression Download PDF

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Publication number
EP4292789A1
EP4292789A1 EP23020293.9A EP23020293A EP4292789A1 EP 4292789 A1 EP4292789 A1 EP 4292789A1 EP 23020293 A EP23020293 A EP 23020293A EP 4292789 A1 EP4292789 A1 EP 4292789A1
Authority
EP
European Patent Office
Prior art keywords
mold
die
parts
casting mold
die casting
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.)
Pending
Application number
EP23020293.9A
Other languages
German (de)
English (en)
Inventor
Christian Eckert
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.)
Sama Maschinenbau GmbH
Original Assignee
Sama Maschinenbau GmbH
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 Sama Maschinenbau GmbH filed Critical Sama Maschinenbau GmbH
Publication of EP4292789A1 publication Critical patent/EP4292789A1/fr
Pending legal-status Critical Current

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    • 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
    • B28B1/261—Moulds therefor
    • 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

Definitions

  • the invention relates to a die-casting mold (die-casting tool) for producing a shaped body made of, in particular, ceramic material.
  • the invention relates to a die-casting device with such a die-casting mold.
  • the invention also relates to a method for producing a shaped body made of, in particular, ceramic material using a die-casting mold.
  • One object of the present invention is to simplify the production of shaped bodies made of, in particular, ceramic material by means of a die-casting mold while increasing the quality of the shaped body produced.
  • the die casting mold according to the invention for producing a molded body made of ceramic material in particular comprises a number of mold parts, at least one of the mold parts being movable for closing the die casting mold, at least two of the mold parts, including the at least one movable mold part, have centering elements designed to complement one another in such a way that when the die casting mold is closed, the at least one movable mold part self-centers through the interaction of these centering elements.
  • the centering elements, which are designed to complement one another are preferably formed exclusively by surface designs of the mold parts themselves, in particular in such a way that these surface designs are provided in a section of the mold parts that is adjacent to the mold cavity and serves to seal the mold parts against one another.
  • at least parts of the centering elements which are designed to be complementary to one another are identical surface contours of the mold parts, in particular in such a way that these surface contours form contact surfaces which make precise contact with each other when the die casting mold is closed.
  • the method according to the invention for producing a molded body made of, in particular, ceramic material by means of a die-casting mold, which die-casting mold has a number of mold parts, with at least one of the mold parts being movable for closing the die-casting mold comprises a method step of closing the die-casting mold, the at least one movable mold part being at centered upon closing the die casting mold itself, because at least two of the mold parts, including the at least one movable mold part, have centering elements which are designed to complement each other and interact with one another during the closing of the die casting mold.
  • a core idea of the invention is to provide the mold parts of the die-casting mold, in particular the mold parts that contribute to the formation of the mold cavity or the mold parts that form the mold cavity, with centering elements that are complementary to one another in such a way that when the die-casting mold is closed, those mold parts that are to Closing the die casting mold can be moved.
  • the centering of the mold parts in the mold occurs solely through the movement of the mold parts themselves.
  • the closed die-casting mold can be provided particularly reliably as a form-fitting unit, which can better absorb the closing forces of the vertical and horizontal cylinders of the closing drive. All mold parts involved are secured in position when the die casting mold is closed and aligned very precisely with one another.
  • the centering elements are formed exclusively by surface designs of the mold parts themselves, namely by identical surface contours of the mold parts, which surface contours are preferably provided on a section of the mold parts that is immediately adjacent to the mold cavity and serves to seal the mold parts against one another, so that - when the mold parts are closed Die casting mold by moving the mold parts together - not only center the mold parts in the die casting mold itself due to their shape defined by these surface contours, but also seal them against each other due to this shape.
  • a contour-guided self-centering of the die casting mold is created, with integrated sealing of the mold parts of the closed die casting mold present as a form-fitting unit, with no additional sealing elements being required for this sealing.
  • the guide contour provided on the mold parts is preferably designed to be S-shaped in cross section, in particular in such a way that the mold parts taper towards the mold cavity.
  • S-curve-shaped guide contour particularly clean sliding into one another and secure centering of the mold parts relative to one another can be achieved, even under long-term loads, since wear on the mold parts is minimized.
  • transitions consist of radii avoids unwanted deformations when closing the mold parts, which could occur if sharp edges are present.
  • the invention can be used for any type of die casting mold and can be applied to all mold parts of a die casting mold.
  • the invention can be particularly advantageously applied to deep die-casting molds, for example die-casting molds for cups, bottles or vases.
  • the contour-guided self-centering of the mold parts according to the invention is used in a die-casting mold with an upper mold part, a lower mold part and mold side parts, the mold parts forming the mold cavity in the collapsed state.
  • the S-curve-shaped guide contour runs obliquely to the closing direction of the upper mold part and/or the lower mold part.
  • all mold parts directly involved in defining the mold cavity have centering elements designed to complement one another.
  • the centering elements are designed in such a way that the movable mold parts can be moved in any order, even simultaneously, for closing the die casting mold, so that no specific sequence has to be adhered to when moving the mold parts together.
  • all mold parts involved are secured in position relative to one another when the die casting mold is closed due to their mutual positive contact.
  • a die-casting device (not shown) is used at least one deep die casting mold 1 includes.
  • the die casting mold 1 has four mold parts 2, 3, 4, 5, three of these mold parts being movable to close the die casting mold 1.
  • the die casting mold 1 comprises an upper mold part 2, a lower mold part 3 and two mold side parts 4, 5.
  • the first mold side part 4 is attached in a stationary manner, while the other three mold parts 2, 3, 5 are designed to be movable.
  • the die casting device also includes at least one closing drive (not shown) for moving these three mold parts 2, 3, 5. With the help of the closing drive, these mold parts can, if necessary, be brought together horizontally and vertically in order to form the mold cavity 7 together with the stationary mold part 4.
  • All four mold parts 2, 3, 4, 5 have centering elements 10. These centering elements 10 are designed to complement each other in such a way that when the die casting mold 1 is closed, the movable mold parts self-center in the mold.
  • the centering elements 10, which are designed to complement one another, are each provided in pairs on mold parts that interact with one another.
  • a first pair of centering elements 10 is formed between the upper mold part 2 and the two mold side parts 4, 5 which are in their operating positions, while a second pair of centering elements 10 is formed between the lower mold part 3 and the two mold side parts 4, 5.
  • the centering elements 10 are located outside the shaping contours 6 of the mold parts 2, 3, 4, 5.
  • the centering elements 10 are formed exclusively by surface designs of the mold parts 2, 3, 4, 5 themselves. These are surface designs in a section 8 of the mold parts 2, 3, 4, 5 which is immediately adjacent to the mold cavity 7 and serves to seal the mold parts 2, 3, 4, 5 from one another and which adjoins the shaping contours 6.
  • the centering elements 10, or in other embodiments at least parts thereof, cause the mold parts 2, 3, 4, 5 to mesh precisely when the die casting mold 1 is closed.
  • the mold parts 2, 3, 4, 5 engage with each other in such a way that the mold parts engage with each other seal.
  • the centering elements 10, or in other embodiments at least parts thereof, are in the illustrated example identical surface contours of the mold parts 2, 3, 4, 5, i.e. surface contours that are identical on the pairs of mold parts involved, so that complementary pairs of contours result.
  • These surface contours form 10 contact surfaces 11, which make precise contact when the die casting mold is closed.
  • the contact surfaces 11 are formed by parts of the surface contours 10; alternatively, the complete surface contours 10 form the contact surfaces 11 (not shown).
  • the surface contours 10 are designed in such a way that the mold parts 2, 3, 4, 5 taper continuously towards the mold cavity 7. This taper is present at least in a substantial part of a mold section having the surface contours 10. In other words, the mold parts 2, 3, 4, 5 taper towards the mold cavity 7.
  • the contact surfaces 11 have an S-curve shape Cross section, ie a curved cross section in which the curve has at least one turning point, preferably exactly one turning point.
  • the S-curve has two opposing radii with a minimum radius of preferably 5 mm (see Fig. 3 ).
  • the S-curve contact surfaces 11 are designed in such a way that the mold parts 2, 3, 4, 5 taper continuously in the direction of the mold cavity 7.
  • the S-curve contact surfaces 11 have a minimum width 18 and a minimum height 19 in cross section, see Fig. 3 .
  • the width and height of the S-curve are advantageously chosen depending on the size and body thickness of the article.
  • the minimum width 18 is preferably 10 mm and the minimum height 19 is preferably 5 mm.
  • the width and height of the S-curve do not exceed a value of 20 mm.
  • the surface contours 10 end in the direction of the mold cavity 7 with a contour section 15 which adjoins the S-curve contact surface 11 and has a straight cross-section and extends to the mold cavity 7, this contour section 15 forming part of the contact surfaces 11, which are located at Closed die casting mold 1 makes precise contact.
  • the flat surfaces formed by these contour sections 15 serve to seal the mold parts 2, 3, 4, 5 from one another and to define particularly small seams.
  • the contour section 15 has a minimum width of 2 mm and a maximum width of 4 mm in cross section.
  • the surface contours 10 end with a S-curve contact surface 11, which runs obliquely to the closing direction 9 and has a straight cross-section.
  • the flat surfaces formed by these contour sections 16 on the interacting mold parts 2, 3, 4, 5 cause a pre-centering of the mold parts 2, 3, 4, 5 when closing the die casting mold 1. At the same time, these flat surfaces serve as demolding slopes. When the die casting mold 1 is closed, the flat surfaces do not rest against each other (clearance fit), see Fig. 3
  • the flat surfaces preferably have an inclination of at least 3° and at most 5° to the closing direction 9. Preferably the inclination is 3°.
  • a drainage slope at the end 14 of the S-curve contact surface 11, which faces in the direction opposite to the mold cavity 7, serves to avoid standing water when opening the die casting mold 1 by providing a drainage surface for water to flow into the tub the machine can run.
  • the drainage slope serves to ensure a secure sealing of the mold, i.e. to ensure that the molding material introduced does not escape to the outside.
  • the angle 17 of the drain slope is 3° in the illustrated example. A small angle also ensures a particularly clean transition from the S-curve to the outside area.
  • the corresponding method for producing a molded body 12 is characterized in that the mold parts 2, 3, 5 center themselves during the closing of the die casting mold 1, because all mold parts 2, 3, 4, 5 that are directly involved in the definition of the mold cavity 7 are complementary have centering elements 10 formed in relation to each other.
  • Three of the mold parts 2, 3, 5 of the die casting mold 1 are used to close the Die casting mold 1 movable.
  • the upper mold part 2 and the lower mold part 3 can be moved against the mold side parts 4, 5.
  • the movable mold side part 5 can be moved against the stationary mold side part 4.
  • the movable mold parts 2, 3, 5 can be moved in any order for closing the die casting mold 1 and the movable mold parts 2, 3, 5 can also be moved at the same time for closing the die casting mold 1. There is therefore no need to follow a specific sequence when moving the mold parts 2, 3, 4, 5 together.
  • the movable mold side part 5 is first moved into its position on the stationary mold side part 4.
  • the lower mold part 3 is then moved into its operating position.
  • the upper mold part 2 moves onto the two mold side parts 4, 5 and is pressed exactly into its desired operating position by the S-shaped contour guide according to the invention.
  • Fig. 1 the closing directions 9 of the upper mold part 2 and lower mold part 3 are shown, in Fig. 2 the opposite opening directions 13.
  • the guide contour 10 provided on the upper mold part 2 is different from the guide contour 10 provided on the lower mold part 3, since the handle of the cup is higher than the cup body.
  • the guide contour 10 on the lower mold part 3 can be identical to the guide contour 10 on the upper mold part 2.
  • the closed die casting mold 1 Due to the guide contours 10 used, the closed die casting mold 1, regardless of the order in which the mold parts 2, 3, 4, 5 are moved together, is a form-fitting unit which absorbs the closing forces of the vertical and Horizontal cylinder of the locking drive can accommodate better. Thanks to the contour-guided self-centering, the upper mold part 2 and the lower mold part 3 can be centered more easily, quickly and better on the two mold side parts 4, 5. All four mold parts 2, 3, 4, 5 are secured in position against one another when the die casting mold 1 is closed and are aligned very precisely with one another.
  • the ceramic molding compound can then be introduced into the mold cavity 7 provided by the die casting mold 1.
  • the components of the die-casting device required for this are known to those skilled in the art, as are the components of the die-casting device required for closing and opening the die-casting mold 1 and the entire control of the die-casting device and will therefore not be explained further at this point.
  • the contour guidance enables a defined opening of the die casting mold 1 with the mold parts 2, 3, 5 being moved apart in any order.
EP23020293.9A 2022-06-15 2023-06-15 Moule de coulée sous pression Pending EP4292789A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022115107.7A DE102022115107A1 (de) 2022-06-15 2022-06-15 Druckgießform

Publications (1)

Publication Number Publication Date
EP4292789A1 true EP4292789A1 (fr) 2023-12-20

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ID=87557766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23020293.9A Pending EP4292789A1 (fr) 2022-06-15 2023-06-15 Moule de coulée sous pression

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EP (1) EP4292789A1 (fr)
DE (1) DE102022115107A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191114794A (en) * 1911-06-26 1912-04-11 T G Green & Co Ltd Improvements in the Process of Manufacture or Means of Making Teapots, Coffee-pots and similar Vessels, in China, Earthenware, or Stoneware.
GB468641A (en) * 1936-01-17 1937-07-09 John James Improvements relating to casting moulds for clay
US2277543A (en) * 1941-08-18 1942-03-24 Downs Thomas Process of molding
DE10130186A1 (de) * 2001-06-22 2003-01-02 Josef Wagner Verfahren und Vorrichtung zum Schlickergießen unter Druckeinwirkung
DE102004015462A1 (de) * 2004-03-26 2006-01-05 Maschinen- Und Stahlbau Julius Lippert Gmbh & Co. Kg Mehrteilige Gießform für den Druckguss von keramischen Formkörpern, deren Verwendung sowie Verfahren mit einer solchen Gießform

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191114794A (en) * 1911-06-26 1912-04-11 T G Green & Co Ltd Improvements in the Process of Manufacture or Means of Making Teapots, Coffee-pots and similar Vessels, in China, Earthenware, or Stoneware.
GB468641A (en) * 1936-01-17 1937-07-09 John James Improvements relating to casting moulds for clay
US2277543A (en) * 1941-08-18 1942-03-24 Downs Thomas Process of molding
DE10130186A1 (de) * 2001-06-22 2003-01-02 Josef Wagner Verfahren und Vorrichtung zum Schlickergießen unter Druckeinwirkung
DE102004015462A1 (de) * 2004-03-26 2006-01-05 Maschinen- Und Stahlbau Julius Lippert Gmbh & Co. Kg Mehrteilige Gießform für den Druckguss von keramischen Formkörpern, deren Verwendung sowie Verfahren mit einer solchen Gießform

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