WO2009041915A1 - Procédé et appareil de moulage d'un double manchon - Google Patents

Procédé et appareil de moulage d'un double manchon Download PDF

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Publication number
WO2009041915A1
WO2009041915A1 PCT/SG2007/000328 SG2007000328W WO2009041915A1 WO 2009041915 A1 WO2009041915 A1 WO 2009041915A1 SG 2007000328 W SG2007000328 W SG 2007000328W WO 2009041915 A1 WO2009041915 A1 WO 2009041915A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
article
cavity
sectional shape
cross
Prior art date
Application number
PCT/SG2007/000328
Other languages
English (en)
Inventor
Qingfa Li
Original Assignee
Agency For Science, Technology And Research
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 Agency For Science, Technology And Research filed Critical Agency For Science, Technology And Research
Priority to PCT/SG2007/000328 priority Critical patent/WO2009041915A1/fr
Publication of WO2009041915A1 publication Critical patent/WO2009041915A1/fr

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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/24—Producing shaped prefabricated articles from the material by injection moulding
    • 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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/02—Moulds with adjustable parts specially for modifying at will the dimensions or form of the moulded article
    • 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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/16—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
    • B28B7/18—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes the holes passing completely through the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C2045/5695—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding using a movable mould part for continuously increasing the volume of the mould cavity to its final dimension during the whole injection step
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/261—Moulds having tubular mould cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding

Definitions

  • This invention relates to a moulding method and apparatus and refers particularly, though not exclusively, to such a method and apparatus for producing ceramic tubes.
  • a sliding sleeve with a core For the production of articles such as ceramics tubes and tubes with multiple holes, there is a known method using a sliding sleeve with a core.
  • the core blocks a portion of the flow path of the material entering the mould (forming the holes), while the sliding sleeve helps to keep the core in position to minimize thermal and bending stresses within the formed tubes, reducing problems of distortion and deformation.
  • the core can have one or many pins, depending on the number of holes to be formed, and the resultant article has good material uniformity throughout, even for articles with high aspect ratios.
  • a method of moulding an article comprises injecting a first material into the cavity to form a first portion of the article, the first material displacing a first sleeve in the cavity; and injecting a second material into the cavity to form a second portion of the article, the second material displacing a second sleeve in the cavity.
  • the method may further comprise placing a core in the cavity for forming at least one elongate opening in the article.
  • the apparatus comprises a die set having a cavity; a first sleeve displaceable by a first material to form a first portion of the article; and a second sleeve displaceable by a second material to form a second portion of the article.
  • the apparatus may further comprise a core in the cavity for forming at least one elongate opening in the article.
  • the core may be located and supported by at least the first sleeve.
  • the core may comprise a plurality of pins for forming a plurality of elongate openings in the article. A number of the plurality of pins may be located and supported by the first sleeve, and another number of the plurality of pins may be located and supported by the second sleeve.
  • the elongate opening may be selected from the group consisting of: through the article, and blind hole.
  • the first sleeve may slideably engage the second sleeve.
  • the second sleeve may slideably engage the cavity.
  • the first sleeve may slideably engage the cavity or at least a section of the first sleeve may be entirely within the second sleeve.
  • the first sleeve may be displaced by pressure of the first material acting on a near end of the first sleeve.
  • the second sleeve may be displaced by pressure of the second material acting on a near end of the second sleeve.
  • the first sleeve may have a first sleeve holder at a far end of the first sleeve, the first sleeve holder being for drawing the first sleeve along the cavity.
  • the second sleeve may have a second sleeve holder at a far end of the second sleeve, the second sleeve holder being for drawing the second sleeve along the cavity.
  • the first sleeve may be of a cross-sectional shape, configuration and size that may be substantially the same as the cross-sectional shape, configuration and size of the first portion of the article.
  • the second sleeve may be of a cross-sectional shape, configuration and size that may be substantially the same as the cross-sectional shape, configuration and size of the second portion of the article.
  • a first sleeve and a second sleeve for use in the moulding of an article, the first sleeve and the second sleeve being for placement in a cavity of a die set and being able to move in a sliding manner relative to the cavity and the second sleeve; the first sleeve being displaceable by a first material to form a first portion of the article, the second sleeve being displaceable by a second material to form a second portion of the article, the first sleeve being of a cross-sectional shape, configuration and size that may be substantially the same as the cross-sectional shape, configuration and size of the first portion of the article, and the second sleeve being of a cross-sectional shape, configuration and size that may be substantially the same as the cross-sectional shape, configuration and size of the second portion of the article.
  • the first sleeve may be for receiving therein, locating relative to the cavity, and supporting, at least one pin for forming at least one elongate opening in the article.
  • the second sleeve may be for receiving therein, locating relative to the cavity, and supporting, at least one pin for forming at least one elongate opening in the article.
  • Figure 1 is a schematic cross-section of a preferred embodiment during the moulding process of a first portion of the article
  • Figure 2 is a schematic cross-section of the embodiment of Figure 1 during the moulding process of a second portion of the article;
  • Figure 3 is a schematic cross-section of an article formed by the embodiment of Figures 1 and 2;
  • Figure 4 is a schematic cross-section of another preferred embodiment during the moulding process of a first portion of the article
  • Figure 5 is a schematic cross-section of the embodiment of Figure 4 during the moulding process of a second portion of the article;
  • Figure 6 is a schematic cross-section of an article formed by the embodiment of Figures
  • Figure 7 is a collage of perspective views of products able to be produced by the process.
  • Figure 8 is a schematic illustration of the process steps with a preferred embodiment.
  • a die set 10 that form a cavity 12 in which a green article is to be formed (prior to subsequent processing such as debinding and sintering).
  • a core 14 is placed in the cavity 12 and held in position by a core holder 16 (100, Figure 8).
  • a core holder 16 100, Figure 8
  • the core 14 passes into and is supported by the first sleeve 20.
  • the first sleeve 20 is moveable with respect to the core 14, and slideably engages the second sleeve 20.
  • at least a portion of the first sleeve 20 is entirely within the second sleeve 22.
  • the second sleeve 22 slideably engages the die set 10.
  • the near end 2On is the end of the first sleeve 20 that is nearer the gate.
  • the core holder 16 keeps the core 14 in position with respect to the die set 10.
  • the first sleeve 20 receives the core 14 therein to hold the core 14 in position relative to the cavity 12, and to support the core 14, until the first sleeve 20 reaches the end of its movement as shown in Figure l(b).
  • a first portion 40 of the article is formed.
  • the core 14 is no longer in, located by or supported by, the first sleeve 20.
  • the core 14 is instead supported by the first material 30 which has displaced the first sleeve 20.
  • a blind hole could be made.
  • a second material 32 enters the cavity 12 as shown in Figure 2(a) (106, Figure 8). Sufficiently solid is to be taken that the first material 30 is of sufficient solidity to minimize transference at the interface of the first and second materials 30, 32.
  • the second material 32 presses on a near end 22n of the second sleeve 22 and forces the second sleeve 22 to move along the cavity 12 (108, Figure 8).
  • the second material 32 fills the cavity 12 between the first material 30 and the die set 10, thus coping with any irregularities in the interface surface of the two materials 30, 32.
  • the die set 10 supports the second sleeve 22 until it reaches the end of its movement as shown in Figure 2(b). At this point, the second material 32 has displaced the second sleeve 22, forming a second portion 42 of the article.
  • the sleeves 20, 22 are the same as, or have a cross-sectional shape, configuration and size, of the respective portions 40, 42 of the green article that they form.
  • the first sleeve 20 is in a slideable fit in the second sleeve 22, while the second sleeve 22 is in a slideable fit with the die set 10.
  • Figure 3 shows the formed green article.
  • the article is a cylindrical tube with a through hole 44 formed by the core 14.
  • the formed tube could be through or blind holes depending on the position of the pins.
  • the tube has a first portion 40 made of a first material 30 and a second portion 42 made of a second material 32.
  • the first material 30 and the second material 32 may be different, or they may be made of the same material but having different material properties, such as initial particle size. Material density can be controlled by varying the moulding parameters such as the material flow rate and the pressure exerted on the near ends 2On, 22n of the sleeves 20, 22.
  • the first material 30 and the second material 32 may have different percentage volume of the same or different ceramic particles in a polymer binder.
  • the polymer binder may provide an additional function of self lubrication of the materials 30, 32 to facilitate material flow in the cavity during moulding.
  • Some mixing of the materials 30, 32 at the interface 41 between the first portion 40 and the second portion 42 of the green article during moulding may also be advantageous. Mixing at the interface 41 may promote better fusion of the two portions 40, 42 upon sintering.
  • the sleeves 20, 22 can each have a sleeve holder 2Oh, 22h that is able to be acted upon by a force provider or actuator to draw the sleeves 20, 22 along the cavity 12 as each material 30, 32 advances along the cavity 12. hi this way the pressure in the cavity 12, and hence on the core 14, may be more controlled, and even reduced. Furthermore, it allows for more control of the core 14 to enable a more even wall thickness for each portion 40, 42 of the article.
  • the sleeve holders 2Oh, 22h are preferably located at a far end 2Of, 22f of the sleeves 20, 22.
  • Figure 4 illustrates another embodiment where the core comprises a plurality of pins 52 that are held in position by a core holder 54 at one end.
  • a number of pins 56 are located and supported by a first sleeve 60, while another number of pins 58 are located and supported by a second sleeve 62.
  • the first sleeve 60 is in sliding contact with the second sleeve 62.
  • Both the first sleeve 60 and the second sleeve 62 are side-by-side in sliding contact with the die set 64.
  • the first sleeve 60 is displaced by a first material 80 pressing on a near end 6On of the first sleeve 60 until the first sleeve 60 reaches the end of its movement as shown in Figure 4(b). Sliding movement of the first sleeve 60 is constrained by both the second sleeve 62 as well as the die set 64.
  • a second material 82 enters to displace the second sleeve 62 as shown in Figure 5(a).
  • the first material 80 is of sufficient solidity to minimize transference at the interface of the first and second materials 80, 82.
  • the second material 82 presses on a near end 62n of the second sleeve 62 and forces the second sleeve 62 to slide in contact with the first sleeve 60 and the die set 64.
  • the second material 82 has displaced the second sleeve 62, forming a second portion 72 of the article.
  • the sleeves.60, 62 can each have a sleeve holder 6Oh, 62h that is able to be acted upon by a force provider or actuator to draw the sleeves 60, 62 while each material 80, 82 advances. In this way the pressure on the pins 52, may be more controlled, and even reduced. Furthermore, it allows for more control of the pins 52 to enable a more even wall thickness for each portion 70, 72 of the article.
  • the sleeve holders 60h, 62h are preferably located at a far end 6Of, 62f of the sleeves 60, 62.
  • Figure 6 shows the formed green article having two portions 70, 72 made of different materials, having multiple through holes 74 formed by the plurality of pins 52.
  • Other examples of products able to be moulded using this process are shown in Figure 7. They include: ceramic tubes with through hole or blind hole, sintering tubes, other products with elongate openings therein or thereon, and so forth, each able to be made of more than one material or to be made of the same material but having different material properties at different locations of the article.
  • the core 14 may be a single core, a single core with a single pin, a single core with multiple pins, or multiple cores. Alternatively, if the article is to have no elongate openings therein, there need not be any core used during moulding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Abstract

Procédé de moulage d'un article, le procédé comprenant : l'injection d'un premier matériau dans la cavité pour former une première partie de l'article, le premier matériau déplaçant un premier manchon dans la cavité ; l'injection d'un second matériau dans la cavité, pour former une seconde partie de l'article, le second matériau déplaçant un second manchon dans la cavité.
PCT/SG2007/000328 2007-09-28 2007-09-28 Procédé et appareil de moulage d'un double manchon WO2009041915A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SG2007/000328 WO2009041915A1 (fr) 2007-09-28 2007-09-28 Procédé et appareil de moulage d'un double manchon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SG2007/000328 WO2009041915A1 (fr) 2007-09-28 2007-09-28 Procédé et appareil de moulage d'un double manchon

Publications (1)

Publication Number Publication Date
WO2009041915A1 true WO2009041915A1 (fr) 2009-04-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2007/000328 WO2009041915A1 (fr) 2007-09-28 2007-09-28 Procédé et appareil de moulage d'un double manchon

Country Status (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8753803B2 (en) 2009-09-10 2014-06-17 Kabushiki Kaisha Toshiba Pattern forming method
AT514693B1 (de) * 2013-10-02 2015-03-15 Plastounik Günther Verfahren und Vorrichtung zum Herstellen eines Strangpress-Profils aus nachwachsenden Rohstoffen
WO2019223926A1 (fr) * 2018-05-23 2019-11-28 Leoni Kabel Gmbh Procédé et dispositif de moulage d'un composant très allongé

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1071436A1 (ru) * 1982-04-08 1984-02-07 Московское научно-производственное объединение по строительному и дорожному машиностроению Устройство дл формовани трубчатых изделий из бетонных смесей
JPH0364569A (ja) * 1987-12-19 1991-03-19 Sumitomo Metal Ind Ltd 繊維の染色用具
FR2757099A1 (fr) * 1997-12-15 1998-06-19 Ceramiques Tech Soc D Outillage et procede de production de tubes en ceramique a l'aide de cet outillage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1071436A1 (ru) * 1982-04-08 1984-02-07 Московское научно-производственное объединение по строительному и дорожному машиностроению Устройство дл формовани трубчатых изделий из бетонных смесей
JPH0364569A (ja) * 1987-12-19 1991-03-19 Sumitomo Metal Ind Ltd 繊維の染色用具
FR2757099A1 (fr) * 1997-12-15 1998-06-19 Ceramiques Tech Soc D Outillage et procede de production de tubes en ceramique a l'aide de cet outillage

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 198440, Derwent World Patents Index; Class P64, AN 1984-248593 *
PATENT ABSTRACTS OF JAPAN *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8753803B2 (en) 2009-09-10 2014-06-17 Kabushiki Kaisha Toshiba Pattern forming method
AT514693B1 (de) * 2013-10-02 2015-03-15 Plastounik Günther Verfahren und Vorrichtung zum Herstellen eines Strangpress-Profils aus nachwachsenden Rohstoffen
AT514693A4 (de) * 2013-10-02 2015-03-15 Plastounik Günther Verfahren und Vorrichtung zum Herstellen eines Strangpress-Profils aus nachwachsenden Rohstoffen
WO2019223926A1 (fr) * 2018-05-23 2019-11-28 Leoni Kabel Gmbh Procédé et dispositif de moulage d'un composant très allongé
CN112236284A (zh) * 2018-05-23 2021-01-15 莱尼电缆有限公司 用于成形细长部件的方法和装置
US11541582B2 (en) 2018-05-23 2023-01-03 Leoni Kabel Gmbh Device for shaping an elongated component

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