WO1997015420A1 - Procede et appareil pour refroidir des outils, des pieces a usiner ou analogue, a l'aide de gaz liquefie - Google Patents

Procede et appareil pour refroidir des outils, des pieces a usiner ou analogue, a l'aide de gaz liquefie Download PDF

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Publication number
WO1997015420A1
WO1997015420A1 PCT/SE1996/001364 SE9601364W WO9715420A1 WO 1997015420 A1 WO1997015420 A1 WO 1997015420A1 SE 9601364 W SE9601364 W SE 9601364W WO 9715420 A1 WO9715420 A1 WO 9715420A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool
liquefied gas
gas
workpiece
cooling
Prior art date
Application number
PCT/SE1996/001364
Other languages
English (en)
Inventor
Leif Nilsson
Original Assignee
Aga Aktiebolag
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 filed Critical Aga Aktiebolag
Priority to AU73562/96A priority Critical patent/AU7356296A/en
Publication of WO1997015420A1 publication Critical patent/WO1997015420A1/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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • B23Q11/1038—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality
    • B23Q11/1053—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality using the cutting liquid at specially selected temperatures
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • 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
    • B29C35/16—Cooling
    • B29C2035/1616—Cooling using liquids
    • B29C2035/1625—Cooling using liquids other than water
    • B29C2035/165—Cooling using liquids other than water liquified gases

Definitions

  • the present invention relates to a method of cooling tools, workpieces or the like with liquefied gas, preferably C0 2 , which is delivered to the tool or workpiece in a liquid state and then brought to a gaseous state as it comes into contact with the tool or workpiece, so as to effectively cool the same.
  • the invention also relates to an arrangement for use in carrying out the method.
  • Tool mould inserts or parts of mould inserts are made of a gas-permeable microporous steel. In other respects, the material behaves in the manner of a typical tool steel. It can be machined, worked and polished to a desired surface finish.
  • the mould chamber can therewith be cooled by delivering liquefied carbon dioxide to the tool for instance, this liquid expanding in the micropores and vapourizing as heat is taken-up from surrounding material, therewith to achieve a very pronounced cooling effect throughout the whole of the mould.
  • the cooling effect achieved is substantially more effective than that achievable with water, resulting in shorter cooling times and therewith in shorter product manufacturing cycle times.
  • microporous material in the mould tool enables any air that may be present in the tool to be evacuated through the tool walls as the plastic material is injected into the mould. This eliminates the ventilation problems encountered with conventional tools and guarantees freedom from damage caused by enclosed pockets of air.
  • the prime object of the present invention is to provide an improved cooling method which utilizes liquefied gas, prefer ⁇ ably C0 2 , and with which the aforesaid disadvantages are eliminated, among other things.
  • the invention is based on the realization that this object can be achieved by first allowing the gas stored in a liquid state to vapourize prior to or during its transportation to the tool, and then re-liquefying the gas prior to its use in cooling the tool.
  • a method defined in the first paragraph is particularly characterized in that the gas is stored in a liquefied state in an insulated tank or in a pressure vessel, in that the liquid gas is vapourized completely or partially and conducted through conduit means to a cooling unit placed in the near vicinity of the tool or the workpiece; in that the gas is re-liquefied in the cooling unit; and in that the liquefied gas is delivered to the tool or the workpiece so as to cool the same in conjunction with said re-vapourization of the liquefied gas.
  • any oil that is present will be separated out, therewith eliminating the risk of oil being delivered to the tool.
  • the re-vapourized coolant can also be readily transported to the tool in simple, non-insulated conduits with the aid of relatively inexpensive valves because of a low system pressure.
  • Tank installations are also simpler and less expensive, since pumps and insulated return conduits can be excluded, among other things.
  • the cooling unit connected to the tank can also be excluded.
  • the process of condensation is suitably effected in a heat exchanger connected to a cooling machine.
  • a very environmentally friendly cooling technique can be achieved by collecting at least a part of the liquefied gas that is vapourized upon contact with the tool and returning said gas to the cooling unit for re-newed liquefication and re ⁇ use. This reduces gas consumption.
  • the aforedescribed method can be applied advantageously for cooling a plastic injecting moulding tool which includes inserts manufactured from a microporous material, such as microporous steel, wherein the gas is preferably C0 2 .
  • the reference numeral 1 in the drawing identifies a preferably vacuum-insulated tank containing liquefied carbon dioxide.
  • the tank also contains gaseous carbon dioxide, which lies above the level of liquid in the tank.
  • the tank pressure may be in the order of 20 bars and the temperature in the order of about - 20°C.
  • the reference numeral 2 identifies a carbon dioxide outlet. If so desired, the outlet may be connected to an evaporator connected to the tank 1 and supplied with liquid carbon dioxide from the tank.
  • a conduit 4 connects the outlet 2 to a condenser 3 in the form of a heat exchanger.
  • the conduit 4 may be dimensioned to enable it to be supplied with liquid carbon dioxide from the tank 1, wherewith the liquid carbon dioxide vapourizes during its passage through the conduit to the heat exchanger 3.
  • the tank outlet may alternatively be positioned to obtain gaseous carbon dioxide directly therefrom.
  • the heat exchanger 3 is connected to a cooling machine 5 which may be of any conventional design and which enables the carbon dioxide to be cooled and liquefied in the heat exchanger 3, so that supercooled, liquid carbon dioxide can be delivered to a tool 6, for instance to an injection moulding tool made of microporous steel.
  • the heat exchanger 3 is located close to the tool 6, to ensure that carbon dioxide will be delivered to the tool in a liquid state. This liquid carbon dioxide expands in the pores in the tool and vapourizes while taking-up heat and therewith cooling adjacent parts, inter alia the moulding present in the mould chamber.
  • a system constructed in accordance with the aforegoing is a very simple system, among other things because non-insulated conduits can be used and because necessary valves will only operate at relatively low pressures. Furthermore, no pump is required and no tank return circuit, and neither does the system require the provision of a costly cooling unit for liquefying recycled carbon dioxide.
  • any contaminants, such as oil, present in the liquid carbon dioxide in the tank 1 will be separated-out as the carbon dioxide evaporates.
  • an oil trap or some similar device for collecting contaminants separated from the gas may be provided.
  • the tank must be washed clean at regular intervals when evaporation of the carbon dioxide takes place in the tank.
  • the gaseous carbon dioxide in the conduit 4 will thus be essentially free from contaminants, and consequently it is preferred that liquefaction of the gas is effected in a heat exchanger or the like, so as to avoid contamination of the gas by fresh contaminants.
  • the heat exchanger 3 may be replaced with some equivalent device that is capable of cooling the gas without contaminating the same.
  • the tank 1 may also be replaced with a gas bottle or a pack of bottles or some other pressure vessels that contain liquid carbon dioxide under high pressure, e.g. a pressure in the magnitude of 50-60 bars.
  • an evaporator is conveniently connected to the gas outlet.
  • the liquefied gas can be used to cool other types of tools or workpieces, e.g. cutting tools, or may be used in other types of processes that require the use of liquefied gas. It will be understood that cryogenic gases other than carbon dioxide can be used when so desired.
  • vapourized coolant can be collected subsequent to cooling the tool, as indicated by block 8, and returned to the condenser 3 located close to the tool 4 for re-newed lique ⁇ faction and re-use, there is obtained a very environmentally friendly cooling process.
  • vapourization of the coolant prior to its transport to the tool, and liquefaction of the vaporized coolant in equipment located close to the tool afford three important advantages, namely that the gas is cleansed from contaminants, such as oil among others, that simpler and less expensive equipment can be used, and that an environ ⁇ mentally friendly cooling process can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Manufacturing & Machinery (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

Procédé pour refroidir des outils, des pièces à usiner ou analogue à l'aide de gaz liquéfié, de préférence du dioxyde de carbone, qui est mis en contact à l'état liquide avec l'outil ou la pièce à usiner. Le gaz liquéfié est vaporisé au moment où il entre en contact avec l'outil ou la pièce à usiner, de façon à les refroidir efficacement. Le système comprend un récipient isolé (1) ou une cuve sous pression pour emmaganiser le gaz, un dispositif pour vaporiser en totalité ou en partie le gaz liquéfié avant ou pendant son passage dans un conduit (4) l'amenant à l'unité de refroidissement (3, 5), laquelle est située à proximité immédiate de l'outil (6) ou de la pièce à usiner et dans laquelle le gaz est reliquéfié. Le gaz liquéfié est ensuite renvoyé au niveau de l'outil (6) ou de la pièce à usiner pour les refroidir, en même temps qu'il est revaporisé. L'invention concerne également un procédé de refroidissement à l'aide de gaz liquéfié.
PCT/SE1996/001364 1995-10-24 1996-10-23 Procede et appareil pour refroidir des outils, des pieces a usiner ou analogue, a l'aide de gaz liquefie WO1997015420A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU73562/96A AU7356296A (en) 1995-10-24 1996-10-23 A method and apparatus for cooling tools, workpieces or the like using liquefied gas

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9503733A SE504872C2 (sv) 1995-10-24 1995-10-24 Sätt och anordning för kylning av verktyg, arbetsstycken eller liknande med kondenserad gas
SE9503733-9 1995-10-24

Publications (1)

Publication Number Publication Date
WO1997015420A1 true WO1997015420A1 (fr) 1997-05-01

Family

ID=20399937

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/001364 WO1997015420A1 (fr) 1995-10-24 1996-10-23 Procede et appareil pour refroidir des outils, des pieces a usiner ou analogue, a l'aide de gaz liquefie

Country Status (3)

Country Link
AU (1) AU7356296A (fr)
SE (1) SE504872C2 (fr)
WO (1) WO1997015420A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005123357A2 (fr) * 2004-06-10 2005-12-29 Advanced Plastics Technologies Luxembourg S.A. Procedes et systemes permettant de reguler des temperatures de moules
WO2006065974A1 (fr) * 2004-12-14 2006-06-22 Northrop Grumman Ship Systems, Inc. Procede et appareil de refroidissement de phase
CN100366410C (zh) * 1998-06-11 2008-02-06 里坦普控股有限公司 温度控制方法和装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661483A (en) * 1969-08-08 1972-05-09 Robert N Bose Apparatus for controlling the flow of liquid
AT378933B (de) * 1984-05-22 1985-10-25 Alpenlaendische Ind & Textilch Vorrichtung zur form-, werkzeug- und behaelterkuehlung od. dgl.
EP0252312A2 (fr) * 1986-07-11 1988-01-13 Messer Griesheim Gmbh Dispositif pour amener un réfrigérant cryogène vers le point de travail d'un manipulateur
EP0369442A2 (fr) * 1988-11-16 1990-05-23 Aga Aktiebolag Méthode de régulation des conditions de travail dans un moule
WO1992015439A1 (fr) * 1991-03-05 1992-09-17 Toolvac Engineering Ab Methode de realisation du revenu d'un outil de moulage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661483A (en) * 1969-08-08 1972-05-09 Robert N Bose Apparatus for controlling the flow of liquid
AT378933B (de) * 1984-05-22 1985-10-25 Alpenlaendische Ind & Textilch Vorrichtung zur form-, werkzeug- und behaelterkuehlung od. dgl.
EP0252312A2 (fr) * 1986-07-11 1988-01-13 Messer Griesheim Gmbh Dispositif pour amener un réfrigérant cryogène vers le point de travail d'un manipulateur
EP0369442A2 (fr) * 1988-11-16 1990-05-23 Aga Aktiebolag Méthode de régulation des conditions de travail dans un moule
WO1992015439A1 (fr) * 1991-03-05 1992-09-17 Toolvac Engineering Ab Methode de realisation du revenu d'un outil de moulage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 011, No. 210; & JP,A,62 027 132 (IWATANI & CO), 5 February 1987. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100366410C (zh) * 1998-06-11 2008-02-06 里坦普控股有限公司 温度控制方法和装置
WO2005123357A2 (fr) * 2004-06-10 2005-12-29 Advanced Plastics Technologies Luxembourg S.A. Procedes et systemes permettant de reguler des temperatures de moules
WO2005123357A3 (fr) * 2004-06-10 2006-05-11 Advanced Plastics Technologies Procedes et systemes permettant de reguler des temperatures de moules
WO2006065974A1 (fr) * 2004-12-14 2006-06-22 Northrop Grumman Ship Systems, Inc. Procede et appareil de refroidissement de phase
US7707841B2 (en) 2004-12-14 2010-05-04 Northrop Grumman Ship Systems, Inc. Phase cooling method and apparatus

Also Published As

Publication number Publication date
SE504872C2 (sv) 1997-05-20
AU7356296A (en) 1997-05-15
SE9503733D0 (sv) 1995-10-24
SE9503733L (sv) 1997-04-25

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