WO1996035563A1 - Moule et son procede de thermoregulation - Google Patents

Moule et son procede de thermoregulation Download PDF

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Publication number
WO1996035563A1
WO1996035563A1 PCT/SE1996/000604 SE9600604W WO9635563A1 WO 1996035563 A1 WO1996035563 A1 WO 1996035563A1 SE 9600604 W SE9600604 W SE 9600604W WO 9635563 A1 WO9635563 A1 WO 9635563A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
molding tool
tool
tempering
cavity
Prior art date
Application number
PCT/SE1996/000604
Other languages
English (en)
Inventor
Owe Larsson
Original Assignee
Aga Aktiebolag (Publ)
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 Aga Aktiebolag (Publ) filed Critical Aga Aktiebolag (Publ)
Priority to AU57094/96A priority Critical patent/AU5709496A/en
Publication of WO1996035563A1 publication Critical patent/WO1996035563A1/fr

Links

Classifications

    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B29C33/04—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
    • B29C33/046—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam using gas
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/30—Mounting, exchanging or centering
    • B29C33/301—Modular mould systems [MMS], i.e. moulds built up by stacking mould elements, e.g. plates, blocks, rods
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3814—Porous moulds
    • 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
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C2045/7343—Heating or cooling of the mould heating or cooling different mould parts at different temperatures

Definitions

  • the present invention relates to a molding tool for producing objects from moldable material and comprising at least one mold part which consists at least partially of sintered metal and which together with a counterpressure part delimits a mold cavity, and which tool includes means for delivering said material to the mold cavity and means for delivering and discharging fluid.
  • the invention also relates to a method of tempering a molding tool.
  • Swedish Patent Specification 8501589-9 teaches the manufacture of mold parts from sintered metal such as to obtain mold parts that have communicating pores.
  • a mold cavity is provided in the mold parts and the mold parts together form a mold in which objects can be molded from natural and synthetic polymers by injection-molding for instance. The mantle surfaces of the mold are closed after providing the mold cavity.
  • the core of the known invention resides in the formation of a magazine in the pore system of the mold for temporary accommodation of air or any other gas that is generated in the injection-molding process.
  • the gas departs from the magazine after each manufacturing cycle when the mold is opened.
  • the aforedescribed method is highly effective, difficulties are encountered in controlling the temperature of different parts of the molding tool in certain applications.
  • the pores also become blocked or clogged with secondary products that form during molding of the polymeric objects. For instance, when injection-molding thermoplastic material in steel molds, about 80% of the manufacturing cycle is often taken up by the cooling time.
  • the plastic material is injected into the mold cavity through a gate or some other nozzle type at a temperature of about 200-250 C.
  • the plastic object is cooled in the mold cavity or chamber by convection, and the heat is carried away by cooling with water that flows in passageways located outside the mold chamber or drilled in the mold steel.
  • cooling passageways in the mold steel often results in weakening of the mold construction. Naturally, this weakening relates primarily to narrow mold parts. A weak mold construction cannot be accepted. Consequently, cooling passageways are omitted in certain parts of the mold, resulting in a cooling deficiency.
  • Another significant problem in this regard is one of providing cooling passageways in connection with a complex mold chamber. This results in uneven cooling or tempering of the mold chamber and therewith in a poorer quality of the molded object.
  • Another problem which often incurs is that because the flow paths are so long, by which is meant the distance from the injection location to the center point of the object, the moldable material is cooled excessively before the mold is completely filled. Consequently, certain inner parts of the mold often remain unfilled.
  • Uneven tempering of the mold chamber is thus a serious problem, both when working with thermoplastic materials and with thermosetting resins, and also when manufacturing molded objects from other materials.
  • Swedish Patent Application 8804644-6 describes a method of solving the aforementioned tempering problem and also the problem of blocking or clogging of the pores.
  • This solution involves controlling the temperature of a molding tool intended for the manufacture of objects from natural or synthetic polymers.
  • the tool includes one or more mold parts produced from sintered metal and having communicating pores obtained by compressing powdered material under high pressure and sintering at high temperatures and thereafter forming a mold cavity in the mold part or parts, wherein the pores are open towards the mold cavity whereas the outer mantle surface of the molding tool is impervious to leakage.
  • the communicating pores are filled with a liquid having a high vaporization temperature, such as to provide heat buffer in the molding tool.
  • the pressure of the liquid in the pores is controlled with the aid of an appropriate pressure generator which is connected to the communicating pores in the molding tool such that the pressure will be increased automatically so as to counteract the inner mold pressure with respect to the liquid in the pores as polymeric material is injected into the closed molding tool.
  • the pressure is then lowered automatically when the tool is again opened, and the inner mold pressure disappears.
  • the pores are therewith filled with said liquid preferably during the entire manufac ⁇ turing cycle.
  • the liquid prevents the pores being clogged by secondary products formed during molding of the polymeric objects, or by filling agent, etc., present in the polymeric material used. Instead of blocking the pores in the porous parts of the molding tool, the secondary products are enclosed in the polymeric product.
  • the liquid is intended to absorb air, water vapor and other gases that may be generated during the molding process. These gases then depart from the liquid when the tool is opened after each manufacturing cycle. Because the liquid is uniformly distributed throughout the entire pore system, uniform tempering of the molding tool is achieved. If necessary, the tool may be heated or cooled by externally applied aggregate and/or by circulating a temperature regulating medium through passageways having impervious walls and arranged in the porous parts of the mold or optionally in remaining parts of said molding tool.
  • the molding tool temperature is normally controlled to a temperature level of about +20 C and about +170 C.
  • the molding tool includes one or more mold parts produced from sintered metal and containing communication pores obtained by compressing and sintering powdery material under high pressure and at high temperatures respectively.
  • This mold part or these mold parts are thereafter provided with a mold cavity, with the outer mantle surface of the tool being impervious to leakage.
  • This known method is characterized by sealingly connecting with the mold tool material, which contains a large number of small communicating pores, one or more capillary tubes or the like which extend through the outer impervious mantle surface of the tool. Gas in liquid form is delivered through the capillary tubes. The liquid-state gas then converts to a gaseous state through expansion in the molding tool externally of the capillary tubes, therewith subjecting the tool to a pronounced cooling effect.
  • the gas used may be carbon dioxide, nitrogen gas or air. Naturally, the gas used is transformed to its liquid phase by conventional compression of the gas phase.
  • the molding tool includes at least one expansion chamber recessed through the outer impervious mantle surface of the tool.
  • a capillary tube through which the liquid-state gas is delivered opens out into the expansion chamber, in which the liquid expands to a gaseous state and then disperses through the communicating pores while cooling the molding tool.
  • the capillary tube may either open out freely into the expansion chamber or may lie against the porous wall of said tool. It is essential that the expansion chamber is made impervious against leakage to the outer mantle surface of the molding tool in both cases.
  • the molding tool may be provided with one, two or more expansion chambers with associated capillary tubes, the number of expansion chambers provided being contingent on the size of the tool concerned, the desired cooling effect, etc.
  • the molding tool used comprises a movable and a fixed part, it is often suitable to include an expansion chamber in each of said two parts.
  • the capillary tubes may also have a function other than the aforesaid function. For instance, they may also be used to evacuate gases from the mold cavity and out of the mold. These gases are often generated during molding of the polymeric material.
  • a first procedural step after closing the mold and injecting plastic material thereinto may conveniently be to evacuate through the capillary tubes the gas that departs from the polymeric material and then introduce the liquid-state cooling gas through the capillary tubes.
  • the liquid-state cooling gas may also be delivered through one capillary tube while simultaneously evacuating the gas departing from the polymer through the second tube.
  • the plastic material used is preferably a thermoplastic material, such as polypropylene, polyvinyl chloride, polyethylene, polyethylene terephthalate, etc.
  • the invention functions equally as well, however, irrespective of the polymer used in the manufacture of objects in the molding tool.
  • the aforedescribed method can also be used to manufacture products from thermosetting resins.
  • Polypropylene has many positive properties in comparison with polyvinyl chloride, not least from an environmental aspect. Because polyvinyl chloride can be molded readily into glass-clear products in conventional working processes, this plastic has been used in many applications where polypropylene has been utilized to a very small extent.
  • the molding tool can be conveniently tempering to a temperature of from
  • the mold cavity can be formed so that the pores are open or closed to the mold cavity. It is also possible to form the mold cavity so that part of the pores bordering on the mold cavity will be closed while another portion of these pores will be open.
  • the cooling gas will, of course, come into contact with the plastic product produced during the molding process. When the mold is then opened, gas will seep out through the pores in the mold cavity. These gas quantities will be small, however.
  • a closed cooling gas system can be provided.
  • the gas may thus be evacuated through, e.g., one capillary tube while delivering liquid-state cooling gas through another capillary tube.
  • this freezing process commences furthest away from the injection location and freezes the moldable material successively up to said injection location, as a result of individual tempering zones in the molding area of the tool. This is achieved by constructing the molding area from segments made of microporous steel and regulating the temperature individually in each segment or groups of segments. This results in quicker cycle times, i.e. shorter object manufacturing times, and smaller injection units and therewith much lower investment costs.
  • each mold part is comprised of a plurality of mold units which are joined together to form said mold part.
  • each mold unit can be considered as a mold part according to the known invention.
  • a characteristic feature of the invention is that the temperature of each mold unit in the mold part is regulated individually independently of the other units, such as to obtain a shorter cycle time.
  • all mold units are heated when delivering the warm moldable material, and the unit or units located furthest from the injection location are cooled first, and thereafter those mold units that are closer to said injection location.
  • the mold units are heated at the time of or prior to injecting the material, the material is able to penetrate distal parts of the mold cavity more readily without solidifying and forming a skin, which would otherwise reduce the cross-sectional area through which the material must pass. This considerably reduces the pressure required to ensure that the mold will be completely filled with moldable material.
  • the pressure used in conjunction with the injection of said material can be reduced by a factor of three or more in comparison with known techniques. This greatly reduces the costs entailed by a system or plant intended for the manufacture of large molded objects.
  • Fig. 1 is a schematic longitudinal section view of a molding tool for the manufacture of large slightly conical vessels
  • Fig. 2 is a schematic cross-sectional view of the tool shown in Fig. 1 , taken on the line A-A in Fig. 1;
  • Fig. 3 is a schematic cross-sectional view of a tool intended for producing on a tube of large diameter a plastic coating for protecting weld joints;
  • Fig. 4 illustrates schematically part of a molding tool which is intended to be joined together with other similar parts such as to form the tempering tool surface that comes into contact with the moldable material.
  • reference numeral 1 identifies a first mold half and reference numeral 2 identifies the complementary second mold half of the inventive molding tool.
  • the mold halves 1 and 2 are movable in relation to one another, to enable the molded object to be removed from the mold.
  • the mold halves present therebetween a chamber or cavity 3 which defines the walls of the object to be produced.
  • the area of the first mold half 1 that faces towards the chamber 3 has a plurality of elements 6A, 6B, 6C..., which are joined together to form an external defining layer of the chamber 3.
  • the area of the second mold half 2 facing towards the chamber 3 has a plurality of elements 7A, 7B, 7C..., which are joined together to form an external defining layer of the chamber 3.
  • Each such element 6, 7 is provided with tubular means or capillary means (not shown) for the delivery of tempering medium, and tubular means or capillary means (not shown) through which the tempering medium used is discharged. These means are embodied in the respective elements 6, 7 through their impervious outer layers.
  • the tubular or capillary delivery means may open into a chamber inwardly of the impervious outer layer, or against a porous metal surface.
  • Fig. 3 illustrates a molding tool for producing around a tube of large diameter a thin coating, preferably a plastic coating, for protecting a weld joint.
  • the two semi-circular parts 11, 12 of the molding tool are held sealingly around a tube 19 by means not shown.
  • each of the mold halves 11, 12 is provided at both ends with semi-circular shoulders whose inner diameters correspond to the outer diameter of the tube 19. These shoulders center the tool around the tube and also close the tubular chamber 13 in its longitudinal direction.
  • the mold halves 11, 12 are also provided along their inner surfaces with porous steel cooling elements 16A, 17A, 16B, 17B... These elements also present tubular means or capillary means (not shown) for delivering tempering fluid and carrying away the used fluid.
  • An inlet 15 for warm coating compound is disposed centrally between the two mold halves 11, 12.
  • Fig. 4 illustrates an example of one embodiment of a porous element 6 for producing the tempered area of the molding tool, e.g. according to one of the aforedescribed embodiments.
  • the area 26 has a surface which comes into contact with the material to be tempered and which has open or closed pores. The remaining sides, of which only three are shown, have surface layers which comprise closed pores.
  • Tubular devices 21 and 22 which function to deliver and carry away fluid are inserted through the surface layer 23.
  • the quantity of fluid delivered and carried away respectively and the temperature of the delivered fluid can be regulated individually with respect to each element 6 with the aid of control means adapted to this end, as illustrated schematically at 27.
  • warm fluid for instance carbon dioxide gas
  • a warm plastic compound for instance is then introduced through the inlet 5 and spreads out in the chamber 3.
  • cooling of the plastic compound is commenced at a location furthest away from the inlet 5.
  • Cooling fluid for instance liquid carbon dioxide
  • the manufactured object is removed from the mold by moving the mold half 2 axially away from the plastic compound inlet pipe 5 and the object is ejected.
  • a plastic layer is produced around a pipe or tube in an analogous manner, with the aid of the tool illustrated schematically in Fig. 3.
  • Liquid plastic compound is injected into the closed tool through the inlet 15 while all elements 16 and 17 are heated with warm fluid.
  • the plastic compound thereafter spreads in the chamber 13.
  • the warm fluid is replaced with cold fluid in the elements 16A and 17A along the entire longitudinal extension of the tube.
  • the warm plastic compound is delivered to the mold until the chamber 13 is filled completely.
  • the warm fluid in the elements 16B and 17B is replaced at this time with cold fluid, and thereafter in the following elements.
  • the tool is opened and removed from the tube.
  • inventive tool and inventive method can be applied suitably for molding all moldable materials, such as natural and synthetic polymers, e.g. thermoplastics and thermosetting plastics, metals or metal alloys, ceramic materials, powder containing a binder for the manufacture of sintered bodies of, e.g., carbide metals, such as tungsten carbide.
  • moldable materials such as natural and synthetic polymers, e.g. thermoplastics and thermosetting plastics, metals or metal alloys, ceramic materials, powder containing a binder for the manufacture of sintered bodies of, e.g., carbide metals, such as tungsten carbide.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un outil de moulage et un procédé de thermorégulation d'un outil de moulage destiné à la fabrication d'objets en matière moulable. Cet outil comprend au moins deux parties de moule (1, 2) qui délimitent une cavité de moule (3), une fois le moule fermé. Il comprend en outre au moins une partie de moule en métal fritté (6, 7) avec des pores communicants. Les parties de moule comprennent une pluralité d'unités métalliques mutuellement jointes (6A, 7A; 6B, 7B...) avec des pores communicants. La surface extérieure de l'unité poreuse est étanche et la zone située en face de la cavité (3) comporte des pores ouverts et fermés. Chaque unité poreuse présente des éléments de distribution et d'évacuation de fluide. Le procédé selon l'invention est caractérisé en ce que la thermorégulation de chaque unité de moule est indépendante de celle des autres unités de moule.
PCT/SE1996/000604 1995-05-09 1996-05-08 Moule et son procede de thermoregulation WO1996035563A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU57094/96A AU5709496A (en) 1995-05-09 1996-05-08 Mold and method for its tempering

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9501721-6 1995-05-09
SE9501721A SE9501721L (sv) 1995-05-09 1995-05-09 Framställning av plastföremål

Publications (1)

Publication Number Publication Date
WO1996035563A1 true WO1996035563A1 (fr) 1996-11-14

Family

ID=20398252

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000604 WO1996035563A1 (fr) 1995-05-09 1996-05-08 Moule et son procede de thermoregulation

Country Status (3)

Country Link
AU (1) AU5709496A (fr)
SE (1) SE9501721L (fr)
WO (1) WO1996035563A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19918428C1 (de) * 1999-04-23 2000-12-28 Christian Kuerten Verfahren zur Kühlung von Werkzeugen mit Kohlendioxid (Co¶2¶)
EP2535163A1 (fr) * 2011-06-16 2012-12-19 Linde Aktiengesellschaft Procédé de refroidissement d'un objet, particulièrement un outil
EP2857170A1 (fr) * 2013-10-02 2015-04-08 Linde Aktiengesellschaft Procédé et dispositif de fabrication d'un composant dans un processus de moulage et composant
US9034234B2 (en) 2009-10-20 2015-05-19 Surface Generation Limited Zone control of tool temperature
US20150224681A1 (en) * 2012-07-24 2015-08-13 Surface Generation Limited Control system for tooling
US9370877B2 (en) 2009-10-20 2016-06-21 Surface Generation Limited Control system for tooling

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220040A2 (fr) * 1985-10-18 1987-04-29 Davidson Textron Inc. Chauffage de moules dans des zones multiples
WO1992015439A1 (fr) * 1991-03-05 1992-09-17 Toolvac Engineering Ab Methode de realisation du revenu d'un outil de moulage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220040A2 (fr) * 1985-10-18 1987-04-29 Davidson Textron Inc. Chauffage de moules dans des zones multiples
WO1992015439A1 (fr) * 1991-03-05 1992-09-17 Toolvac Engineering Ab Methode de realisation du revenu d'un outil de moulage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19918428C1 (de) * 1999-04-23 2000-12-28 Christian Kuerten Verfahren zur Kühlung von Werkzeugen mit Kohlendioxid (Co¶2¶)
US9034234B2 (en) 2009-10-20 2015-05-19 Surface Generation Limited Zone control of tool temperature
US9370877B2 (en) 2009-10-20 2016-06-21 Surface Generation Limited Control system for tooling
EP2535163A1 (fr) * 2011-06-16 2012-12-19 Linde Aktiengesellschaft Procédé de refroidissement d'un objet, particulièrement un outil
US20150224681A1 (en) * 2012-07-24 2015-08-13 Surface Generation Limited Control system for tooling
EP2857170A1 (fr) * 2013-10-02 2015-04-08 Linde Aktiengesellschaft Procédé et dispositif de fabrication d'un composant dans un processus de moulage et composant

Also Published As

Publication number Publication date
AU5709496A (en) 1996-11-29
SE9501721L (sv) 1996-11-10
SE9501721D0 (sv) 1995-05-09

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