WO2004012921A1 - Systeme de thermoreglage d'un moule - Google Patents

Systeme de thermoreglage d'un moule Download PDF

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Publication number
WO2004012921A1
WO2004012921A1 PCT/IB2003/003372 IB0303372W WO2004012921A1 WO 2004012921 A1 WO2004012921 A1 WO 2004012921A1 IB 0303372 W IB0303372 W IB 0303372W WO 2004012921 A1 WO2004012921 A1 WO 2004012921A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
thermoregulation
mould
branch
liquid
Prior art date
Application number
PCT/IB2003/003372
Other languages
English (en)
Italian (it)
Inventor
Alessandro Santoro
Massimo Bellossi
Original Assignee
Am Service S.R.L.
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 Am Service S.R.L. filed Critical Am Service S.R.L.
Priority to AU2003249446A priority Critical patent/AU2003249446A1/en
Publication of WO2004012921A1 publication Critical patent/WO2004012921A1/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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/007—Tempering units for temperature control of moulds or cores, e.g. comprising heat exchangers, controlled valves, temperature-controlled circuits for fluids
    • 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
    • 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
    • B29C45/7306—Control circuits therefor

Definitions

  • thermoregulation system for moulds, in particular for plastic moulds .
  • a thermoregulation system for moulds used in injection moulding of thermoplastic or thermosetting resins should be able to carry out a precise control on the temperature of every mould depending on specific manufacturing needs.
  • a thermoregulation system comprises a hydraulic thermoregulation circuit that can be connected to at least a heat exchange coil associated with a mould.
  • the thermoregulation circuit normally comprises a primary hydraulic cooling circuit equipped with an intake tube for a liquid, generally water, used for thermoregulation, and with a return tube for the liquid heated after going through the heat exchange coil. Said primary circuit can be connected to other similar thermoregulation circuits for controlling the temperature of the corresponding moulds.
  • the primary circuit also comprises a cooling device placed between the return tube and the intake tube, which can cool the liquid before conveying it into the thermoregulation circuit.
  • the primary circuit can be excluded by taking water directly from the water net- work at normal supply temperature.
  • thermoregulation circuit beyond having a cooling function, can also be used to heat the mould always through the heat exchange coil by switching on, by actuating suitable valves, a hydraulic heating circuit .
  • thermoregulation devices At the state of the art the flow of liquid coming from the intake tube of the primary cooling . circuit is normally adjusted by means of flow meters equipped with a tap that can be actuated manually by an operator so as to adjust the flow rate of the cooling liquid in the circuit as needed.
  • automatic thermoregulation devices have been launched on the market, in which the flow of cooling liquid is adjusted by means of an on-off intake valve in the thermoregulation circuit, i.e. fully open ox fully closed.
  • the intake valve is interlocked to an electronic control unit which receives in its turn signals from at least a temperature sensor detecting mould temperature directly or indirectly.
  • the heating circuit is interlocked to said control unit so as to adjust the amount of heat thus generated.
  • thermoregulation circuit for cooling the mould works by opening and closing successively the intake valve for time lapses defined automatically by the control unit, corresponding to the amounts of cold liquid to be conveyed into said thermoregulation- circuit depending on the temperature reduction to be obtained.
  • the heating circuit which can be selectively connected to the thermoregulation circuit, comprises at the state of the art a pump with quite a high discharge head in a tank equipped with suitable electrical resistors that can bring to high temperature the liquid stored therein and introduced into the thermoregulation circuit.
  • the operating mode in a heating circuit envisages that the liquid stored in the tank is brought to a given temperature together with the actuation of the pump which circulates it in the thermoregulation circuit.
  • the heating circuit requires , especially at fi rst start of the system, long times and a high consumption of electric energy so as to bring to the required temperature the large mass of water stored in the tank it is equipped with .
  • thermoregulation systems globally bulky .
  • the technical task underlying the present invention is to conceive a mould thermo regulation system that can basically obviate the af oresaid drawbacks .
  • thermoregulation system ' for moulds enabling an extremely precise control of the temperature thereof .
  • thermoregulation system that can increase the temperature of the liquid used for thermoregulation, and therefore also mould temperature , in far shorter times than that or those required at the state of the art, thus sparing energy especially at first start of the system.
  • thermoregulation system that has globally a small overall size .
  • the technical task and the aims referred to above are basically achieved by a mould thermoregulation system characterized in that it comprises one or more of the technical solutions as claimed below.
  • FIG. 1 shows a drawing of the system according to the invention.
  • FIG. 1 shows a longitudinally sectioned view of a heating assembly used in the heating circuit of the system in Figure 1.
  • thermoregulation circuit 2 It comprises a hydraulic thermoregulation circuit 2 that can be connected to at least a heat exchange coil 3 associated with a mould 4 to be cooled or heated depending on planned manufacturing processes.
  • the thermoregulation circuit 2 comprises a primary hydraulic cooling circuit 5, conventional and known per se, comprising an intake tube 6 for a thermoregulation liquid, for instance water, a return tube 7 for the heated liquid coming from said thermoregulation circuit, and a cooling device 8 placed between the return tube 7 and the intake tube 6 and designed to bring back to low temperature the heated liquid.
  • the thermoregulation circuit 2 comprises an intake branch 9 ' placed upwards from the mould 4 and connected to the intake tube 6, and a return branch 10 placed downwards from the mould 4 and connected to the return tube 7.
  • a hydraulic heating circuit 11 has an. operating branch lla connected on its end to the intake branch 9 and to the return branch 10, which can be selectively connected to the thermoregulation circuit 2. It is further provided for: an intake valve 12 placed on the intake branch 9 near the intake tube 6, a temperature sensor 13, advantageously placed on the return branch 10 directly downwards from the mould 4, if necessary an auxiliary sensor 13a placed upwards from the mould 4, and an electronic control unit 14 sending control signals at least to the heating circuit 11 and to the intake valve 12 and receiving signals coming from the temperature sensors 13 and 13a.
  • the intake valve 12 consists of a proportional flow-adjusting valve, i.e.
  • the heating circuit 11 advantageously comprises a circulation pump 15 installed in the operating branch lla defined by said heating circuit, and a continuous flow heating assembly 16 preferably operating upwards from the mould 4 and from the auxiliary sensor 13a.
  • the heating assembly 16 comprises a metal mass 17 with a high thermal conductivity equipped with a passage channel 18 for- the thermoregulation liquid, and one or more electric resistors 19 drowned in said metal mass 17 and opera- tively interlocked to the control unit- 14.
  • a first shut-off valve 20 i.e.
  • shut-off valves 20 and 21 can be managed by the electronic control unit 14.
  • thermoregulation system described above mainly from a structural point of view, works as follows . If the mould 4 has to be cooled, the first shut-off valve 20 is closed so as to exclude the heating circuit 11, and the second shut-off valve 21 is opened. The control unit 14 adjusts the opening degree of the intake valve 12 and therefore the amount of liquid flow coming from the intake tube 6 conveyed into the thermoregulation circuit 2.
  • the first shut-off valve 20 is opened, the intake valve 12 is closed and then also the second shut-off valve 21 is closed.
  • the liquid is circulated by the circulation pump 15 in the closed circuit comprising the operating branch lla and the two portions of intake 9 and return tube 10 between the mould 4 and said operating branch lla.
  • the heating assembly 16 interlocked to the control unit 14, increases the temperature of the liquid going with continuous flow through it.
  • the control unit immediately switches off the electric resistors 19 of the heating assembly 16 and, if necessary, adjusts the opening of the intake valve 12 and opens the second shut-off valve 21 so as to enable a flow of cold liquid in the thermoregulation circuit, which mixes immediately with the warm liquid and lowers its temperature .
  • the invention has important advantages. As a matter of fact, first of all, the proportional intake valve enables the control unit to vary continuously the flow rate of cold liquid to be introduced into the thermoregulation circuit, thus obtaining a similarly gradual and precise variation of mould temperature .
  • the arrangement of the temperature sensor on the return branch of the thermoregulation circuit allows to obtain temperatures that are closer to those required in the mould than other solutions envisaging to place the temperature sensor upwards from said mould.
  • the continuous flow heating assembly beyond enabling a small overall size for the system since it does not require the presence of a bulky tank, limits times required for heating the liquid, especially at first start, to values that are far lower than those at the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un système de thermoréglage de moules, plus particulièrement de moules plastiques, comprenant un circuit de thermoréglage hydraulique (2) qui peut être connecté à au moins une bobine d'échange thermique (3) associée à un moule (4), un circuit principal de refroidissement hydraulique (5) connecté audit circuit de thermoréglage (2), un circuit de chauffage hydraulique (11) qui peut être connecté de manière sélective audit circuit de thermoréglage (2), au moins une soupape d'admission proportionnelle (12) pour le liquide dudit circuit de thermoréglage (2), au moins un capteur de température (13), et une unité de commande (14) de ladite soupape d'admission (12) et dudit circuit de chauffage (11).
PCT/IB2003/003372 2002-07-31 2003-07-23 Systeme de thermoreglage d'un moule WO2004012921A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003249446A AU2003249446A1 (en) 2002-07-31 2003-07-23 Mould thermoregulation system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20021712 ITMI20021712A1 (it) 2002-07-31 2002-07-31 Impianto di termoregolazione di stampi.
ITMI2002A001712 2002-07-31

Publications (1)

Publication Number Publication Date
WO2004012921A1 true WO2004012921A1 (fr) 2004-02-12

Family

ID=31198613

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2003/003372 WO2004012921A1 (fr) 2002-07-31 2003-07-23 Systeme de thermoreglage d'un moule

Country Status (3)

Country Link
AU (1) AU2003249446A1 (fr)
IT (1) ITMI20021712A1 (fr)
WO (1) WO2004012921A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100445072C (zh) * 2005-04-28 2008-12-24 鸿富锦精密工业（深圳）有限公司 射出成型系统
EP2602085A1 (fr) * 2011-12-08 2013-06-12 Wenz Kunststoff GmbH & Co. KG Dispositif et procédé destinés à la régulation du débit d'un outil de moulage par injection

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3837769A (en) * 1972-07-29 1974-09-24 H Erlenbach Apparatus for the manufacture of molded articles of foam-forming thermoplastic synthetics
DE2808139A1 (de) * 1978-02-25 1979-08-30 Heinz Ing Grad Kienle Verfahren zum temperieren von formen, insbesondere druckgiess-, spritzguss- o.dgl. formen und vorrichtung zur durchfuehrung des verfahrens
US4642043A (en) * 1983-07-09 1987-02-10 Hotset Heizpatronen Und Zubehor Gmbh Device for the electric heating and fluid cooling of an injection-molding machine nozzle
JPS62261412A (ja) * 1986-05-09 1987-11-13 Nissan Motor Co Ltd 金型温度の制御方法
JPS6418620A (en) * 1987-07-15 1989-01-23 Komatsu Mfg Co Ltd Mold temperature adjusting apparatus for injection molding machine
JPH04301425A (ja) * 1991-03-29 1992-10-26 Sumitomo Jukikai Plast Mach Kk 金型温調機

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3837769A (en) * 1972-07-29 1974-09-24 H Erlenbach Apparatus for the manufacture of molded articles of foam-forming thermoplastic synthetics
DE2808139A1 (de) * 1978-02-25 1979-08-30 Heinz Ing Grad Kienle Verfahren zum temperieren von formen, insbesondere druckgiess-, spritzguss- o.dgl. formen und vorrichtung zur durchfuehrung des verfahrens
US4642043A (en) * 1983-07-09 1987-02-10 Hotset Heizpatronen Und Zubehor Gmbh Device for the electric heating and fluid cooling of an injection-molding machine nozzle
JPS62261412A (ja) * 1986-05-09 1987-11-13 Nissan Motor Co Ltd 金型温度の制御方法
JPS6418620A (en) * 1987-07-15 1989-01-23 Komatsu Mfg Co Ltd Mold temperature adjusting apparatus for injection molding machine
JPH04301425A (ja) * 1991-03-29 1992-10-26 Sumitomo Jukikai Plast Mach Kk 金型温調機

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 141 (M - 691) 28 April 1988 (1988-04-28) *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 193 (M - 822) 9 May 1989 (1989-05-09) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 117 (M - 1378) 11 March 1993 (1993-03-11) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100445072C (zh) * 2005-04-28 2008-12-24 鸿富锦精密工业（深圳）有限公司 射出成型系统
EP2602085A1 (fr) * 2011-12-08 2013-06-12 Wenz Kunststoff GmbH & Co. KG Dispositif et procédé destinés à la régulation du débit d'un outil de moulage par injection
EP2602085B1 (fr) 2011-12-08 2015-11-25 Wenz Kunststoff GmbH & Co. KG Dispositif et procédé destinés à la régulation du débit d'un outil de moulage par injection

Also Published As

Publication number Publication date
AU2003249446A1 (en) 2004-02-23
ITMI20021712A1 (it) 2004-02-01

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