EP1840487B1 - Endloskapillarrohr in Aluminiumlegierung und Drosselventil mit diesen Endloskapillarrohr in Aluminiumlegierung - Google Patents

Endloskapillarrohr in Aluminiumlegierung und Drosselventil mit diesen Endloskapillarrohr in Aluminiumlegierung Download PDF

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Publication number
EP1840487B1
EP1840487B1 EP06112083.8A EP06112083A EP1840487B1 EP 1840487 B1 EP1840487 B1 EP 1840487B1 EP 06112083 A EP06112083 A EP 06112083A EP 1840487 B1 EP1840487 B1 EP 1840487B1
Authority
EP
European Patent Office
Prior art keywords
weight max
capillary tube
aluminium alloy
weight
endless
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.)
Revoked
Application number
EP06112083.8A
Other languages
English (en)
French (fr)
Other versions
EP1840487A1 (de
Inventor
Riccardo Fogari
Alessandro Guglielmini
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.)
Aro Tubi Components Poland Sp Zoo
Arotubi It Srl
Original Assignee
ARO TUBI TRAFILERIE SpA
Cr Srl
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
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Application filed by ARO TUBI TRAFILERIE SpA, Cr Srl filed Critical ARO TUBI TRAFILERIE SpA
Priority to EP06112083.8A priority Critical patent/EP1840487B1/de
Priority to PL06112083T priority patent/PL1840487T4/pl
Priority to SI200631736T priority patent/SI1840487T1/sl
Priority to BRPI0701245-4A priority patent/BRPI0701245A2/pt
Publication of EP1840487A1 publication Critical patent/EP1840487A1/de
Application granted granted Critical
Publication of EP1840487B1 publication Critical patent/EP1840487B1/de
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/085—Making tubes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/37—Capillary tubes

Definitions

  • the present invention relates to new "endless" capillary tubes, used preferably in the production of lamination valves.
  • capillary tubes As lamination valves, adapted to regulate the thermodynamic cycle of the circuit.
  • the length and the internal diameter basically determine the pressure drop of the cooling means used in the circuit. Therefore in the aforesaid valves the so-called flow rate of the capillary tubes employed, constitutes, together with the choice of fluid used, the key factor for the dimensioning and project design of the whole cooling system.
  • GB-A-2376513 discloses an example of heat transfer element for use within a refrigeration system wherein the heat transfer tubing portion is made of aluminium, in particular Al 3103.
  • flow rate refers to the volume of fluid (generally nitrogen or dry air is used as measuring fluid or gas) that passes through the section of the capillary tube during a unit of time at a determined inlet pressure.
  • the flow rate is conventionally measured in litres per minute.
  • the flow rate of a capillary tube is measured according to UNI EN 12450 standards. In fact, specific instruments are available on the market designed for this purpose.
  • the gas is sent into the capillary tube at a pressure between 0.5 and 20 bar, more preferably between 4 and 15 bar. Even more preferably, the measuring gas pressure ranges between 5 and 10 bar.
  • the capillary tubes destined for the aims specified herein are produced as "endless" tubes wound in rolls (so-called wound coils) and obtained through continuous machining comprising a succession of cold-drawning operations with a floating chuck on roughly semi-machined blanks obtained through extrusion.
  • wound coils wound in rolls
  • the internal diameter be constant, and it is thus important that materials in use possess well-defined chemical, physical and mechanical characteristics.
  • Other important characteristics that are required and that cannot be modified because these are dictated by the preferred use are the resistance of the employed material to corrosion, as well as its compatibility with the fluids and other materials used in the cooling circuit.
  • capillary tubes with a constant flow rate in the form of endless tubes, preferably wound in rolls or coils, preferably to be used to obtain lamination valves for household appliance cooling circuits from an alternative material, also less costly and less valuable than copper. Therefore there is a definite need for the provision of new lamination valves available for household appliance cooling circuits, in which the capillary tube, while providing the same performance level, is composed of a more economical alternative material. Moreover, it would be particularly advantageous if the said new lamination valves comprise a capillary tube composed of a material that is more resistant to corrosion and particularly suitable for use in the context of cooling circuits.
  • the present invention also provides a method for the production of endless capillary tubes according to claim 4 in an aluminium alloy, particularly suitable for the aforesaid aims, since it is able to be used on existing machines without the need for any modifications.
  • the term "capillary tube” refers to a tube whose internal diameter is very small, in particular, 4.5mm or less.
  • the internal diameter is such that the behaviour of a fluid in the tube interior, in particular a fluid commonly used in household appliance cooling circuits, is controlled by the so-called physical principle of capillarity. Therefore, more preferably, the capillary tubes of the present invention are characterised by an internal diameter less than 3mm, even more preferably less than 1.0mm. More preferred capillary tubes have an internal diameter less than 0.7mm.
  • the minimum diameter of the capillary tubes according to the present invention is 0.2mm, preferably 0.3mm, more preferably 0.4mm, and most preferably 0.5mm.
  • the capillary tubes of the present invention have an internal diameter 4,5mm or less, preferably less than 3mm, more preferably less than 1 mm, even more preferably less than 0.7 mm.
  • the capillary tubes of the present invention have an internal diameter that ranges between 4,5mm and 0.2 mm, preferably between less than 3mm and 0.2mm, more preferably between less than 1 mm and 0.2mm, even more preferably between less than 0.7 mm and 0.2mm.
  • the capillary tubes of the present invention have an internal diameter between 4.5mm and 0.3 mm, preferably between less than 3mm and 0.3mm, more preferably between less than 1 mm and 0.3mm, even more preferably between less than 0.7 mm and 0.3mm.
  • the capillary tubes of the present invention have an internal diameter that ranges between 4.5mm and 0.4 mm, preferably between less than 3mm and 0.4mm, more preferably between less than 1 mm and 0.4mm, even more preferably between less than 0.7 mm and 0.4mm.
  • capillary tubes of the present invention have an internal diameter ranging between 4.5mm and 0.5 mm, preferably between less than 3mm and 0.5mm, more preferably between less than 1 mm and 0.5mm, even more preferably between less than 0.7 mm and 0.5mm.
  • endless capillary tube refers to a seamless capillary tube obtained by means of continuous production.
  • Said "endless" capillary tube is at least 100 metres long, preferably at least 500 metres long, even preferably at least 1000 metres long.
  • the endless capillary tube is wound to form rolls or wound coils.
  • the endless capillary tubes in aluminium alloy of the present invention are characterised by a very strict proportionality between flow rate and length.
  • the flow rates of two segments of capillary tube having a length of 2500mm cut from two positions taken at random from the endless tube do not vary by more than ⁇ 6%, preferably ⁇ 3%, even more preferably ⁇ 2% and most preferably ⁇ 1%.
  • the aluminium tube is able to guarantee:
  • a preferred aluminium alloy consists of: Si: 0.10% in weight max.; Fe: 0.20% in weight max.; Cu: 0.10% in weight max.; Mn: 0.90 -1,10% in weight; Mg: 0.03% in weight max.; Cr: 0.03% in weight max.; Zn: 0.07% in weight max.; Ti: 0.03% in weight max.; the remainder being aluminium and inevitable impurities.
  • an aluminium alloy consisting of: Si: 0.10% in weight max.; Fe: 0.15% in weight max.; Cu: 0.10% in weight max.; Mn: 1.00 - 1.10% in weight; Mg: 0.03% in weight max.; Cr: 0.03% in weight max.; Zn: 0.07% in weight max.; Ti: 0.03% in weight max.; the remainder being aluminium and inevitable impurities.
  • the aluminium alloy identified above permit the production of endless capillary tubes of the present invention, using the same processes used to produce endless capillary tubes in copper, without the need for any modifications.
  • the aluminium alloy according to claim 1 permits continuous production without the forming of faults or rupture during the working.
  • the machine tools traditionally optimised for the production of copper capillary tubes can be used to total benefit without the need for modification.
  • an aluminium alloy that belongs to the general class 3103 (in other words aluminium alloy composed of Si: 0.50% in weight max.; Fe: 0.70% in weight max.; Cu: 0.05% - 0.10% in weight; Mn: 0.90 - 1.50% in weight; Mg: 0.30% in weight max.; Cr: 0.10% in weight max.; Zn: 0.20% in weight max.; Ti: absent, the remainder being aluminium and inevitable impurities), as defined by UNI EN 9003/3 standards, is not sufficient to guarantee material workability of a level that permits continuous production of capillary tubes with homogeneous quality with the current technology available.
  • this class alloys exist with similar compositions, but with different performance levels in terms of mechanical characteristics, even up to a level of 25 %: this fact makes it impossible to obtain constant production (continuous and with homogeneous quality) using machinery currently available.
  • the reduction of the maximum Fe content from 0.70 % (alloy 3103) to 0.25 % provides an improvement in productivity and the surface quality of the product because of a lesser quantity of precipitates with abrasive action.
  • an alloy with the identified composition but with an Fe content equal to 0.40 % (outside the specific object of the present invention but within class 3103) produces roughness on the extruded tube equal to 2,5 ⁇ m (Ra) compared to 1 ⁇ m (Ra) of the alloy object of the invention.
  • the alloy within the scope of the present invention permits better use of the machining tools because of reduced wear, and also makes the formation of material agglomerates on the tools less probable, a problem that can cause productive line arrest in order to replace the deteriorated tools.
  • the alloy within the scope of the present invention can be considered as an evolution of the alloy class 3103 according to UNI 9003/3 standards, which, in itself is not suited to the production of "endless" capillary tube.
  • this material generally offers excellent plastic cold workability levels, but combined with a very low mechanical resistance which creates a decided drop in tool performance caused by accumulated material residue on the tools during machining.
  • the interiors of the capillary tubes realised in this manner also show a high level of machining residue.
  • alloy 3103 according to UNI 9003/3 has manganese as the main alligation element and is currently widely used in particularly strict applications such as the automotive industry.
  • Alloy 3103 has a mechanical resistance, in the same physical state, of approximately 50 % more than alloy 1070 and maintains good plastic cold workability characteristics.
  • the problems described for alloy 1070 were also encountered by the inventors of the present Application with the alloy 3103 although at a slightly lesser level. In any case, as demonstrated above, it is important to emphasise the fact that alloy 3103 was not generally suitable for the production of "endless" capillary tubes according to the present invention since the composition interval defined by the standards in question, identifies an alloy family with properties that are too different from one another.
  • the corresponding mechanical characteristics can vary by more than 25 % in terms of mechanical resistance (from 95 to over 120 N/mm2 for an extruded tube, and from approximately 145 to over 185 N/mm2 for a capillary tube not subjected to heat treatment), and since this is only the first step in a succession of further mechanical operations, it would seem that this variability is excessive because it does not permit a production process able to provide constant and repeatable performance with the variations in the composition of the material within acceptable limits.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Claims (10)

  1. Endloskapillarrohr aus einer Aluminiumlegierung, von dem Typ, der einen Innendurchmesser in dem Bereich zwischen 0,2 und 4,5 mm und eine Länge in dem Bereich von 100 bis 10.000 mm aufweist,
    dadurch gekennzeichnet, dass
    der Durchsatz zweier Segmente des Kapillarrohrs mit einer Länge von 2.500 mm, die an zwei zufällig ausgewählten Positionen aus dem Endloskapillarrohr herausgeschnitten werden, um nicht mehr als ± 6 % variiert, wobei die Aluminiumlegierung besteht aus: maximal 0,15 Gew.-% Si, maximal 0,25 Gew.-% Fe, maximal 0,10 Gew.-% Cu, maximal 0,90 - 1,10 Gew.-% Mn, maximal 0,06 Gew.-% Mg, maximal 0,06 Gew.-% Cr, maximal 0,10 Gew.-% Zn, maximal 0,06 Gew.-% Ti, wobei der Rest aus Aluminium und unvermeidbaren Verunreinigungen besteht.
  2. Endloskapillarrohr aus einer Aluminiumlegierung nach Anspruch 1,
    dadurch gekennzeichnet, dass
    der Durchsatz der zwei Segmente um nicht mehr als ± 3 % variiert, vorzugsweise um nicht mehr als ± 2 %, bevorzugter um nicht mehr als ± 1%.
  3. Endloskapillarrohr aus einer Aluminiumlegierung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
    es gewunden ist, um Rollen oder gewundene Spulen zu bilden.
  4. Verfahren zur Herstellung von Endloskapillarrohren aus einer Aluminiumlegierung, wie sie in den vorstehenden Ansprüchen beschrieben sind, die folgenden Schritte umfassend:
    • Heißstrangpressen eines aufgerauten Rohlings;
    • aufeinanderfolgende Stufen des Kaltziehens, wobei die Anzahl der Stufen von dem in Betracht gezogenen Bearbeitungszyklus abhängt; wobei der Außendurchmesser und die Dicke des Rohres mit jeder Stufe des Strangpressens verringert werden, bis der endgültige Messwert erhalten wird;
    • Winden, um gewundene Spulen zu bilden;
    • Waschen der Innenflächen, um Bearbeitungsreste zu beseitigen;
    • Wärmebehandlung zum Modifizieren der mechanischen Eigenschaften des Kapillarrohrs, wodurch die Verformbarkeit erhöht wird.
  5. Kapillarrohr aus einer Aluminiumlegierung nach Anspruch 1,
    dadurch gekennzeichnet, dass
    die geometrische Zweiteilung des Kapillarrohrs zwei gleiche Abschnitte mit derselben Länge erzeugt und dass sich deren jeweilige Durchsätze um nicht mehr als ± 6 % voneinander unterscheiden.
  6. Kapillarrohr nach Anspruch 5,
    wobei der Durchsatz der zwei Hälften um nicht mehr als ± 3 % variiert, bevorzugt um nicht mehr als ± 2 %, bevorzugter um nicht mehr als ± 1 %.
  7. Verwendung des Kapillarrohrs nach Anspruch 5 oder 6,
    um ein Beschichtungsventil für Haushaltsanwendungen zu erhalten.
  8. Endloskapillarrohr aus einer Aluminiumlegierung nach Anspruch 1. bis 3, 5, 6,
    wobei die Aluminiumlegierung besteht aus: Si: maximal 0,10 Gew.-%; Fe: maximal 0,20 Gew.-%; Cu: maximal 0,10 Gew.-%; Mn: 0,90-1,10 Gew.-%; Mg: maximal 0,03 Ges.-%; Cr: maximal 0,03 Gew.-%; Zn: maximal 0,07 Gew.-%; Ti: maximal 0,03 Gew.-%; wobei der Rest aus Aluminium und unvermeidbaren Verunreinigungen besteht.
  9. Endloskapillarrohr aus einer Aluminiumlegierung nach Anspruch 1 bis 3, 5, 6,
    wobei die Aluminiumlegierung besteht aus: Si: maximal 0,10 Gew.-%; Fe: maximal 0,15 Gew.-%; Cu: maximal 0,10 Gew.-%; Mn: 1,0 - 1,1 Gew.-%; Mg: maximal 0,03 Gew.-%; Cr: maximal 0,03 Gew.-%; Zn: maximal 0,07 Gew.-%; Ti: maximal 0,03 Gew.-%; wobei der Rest aus Aluminium und unvermeidbaren Verunreinigungen besteht.
  10. Beschichtungsventil für Haushaltsanwendungen, das ein Kapillarrohr nach Anspruch 1 bis 3, 5, 6, 8, 9 umfasst.
EP06112083.8A 2006-03-31 2006-03-31 Endloskapillarrohr in Aluminiumlegierung und Drosselventil mit diesen Endloskapillarrohr in Aluminiumlegierung Revoked EP1840487B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP06112083.8A EP1840487B1 (de) 2006-03-31 2006-03-31 Endloskapillarrohr in Aluminiumlegierung und Drosselventil mit diesen Endloskapillarrohr in Aluminiumlegierung
PL06112083T PL1840487T4 (pl) 2006-03-31 2006-03-31 Bezkońcowe rurki kapilarne ze stopu aluminium i zawory dławiące zawierające rurki kapilarne ze stopu aluminium
SI200631736T SI1840487T1 (sl) 2006-03-31 2006-03-31 Brezkončne kapilarne cevi v aluminijevi zlitini in laminacijski ventili, obsegajoči kapilarne cevi iz aluminijevih zlitin
BRPI0701245-4A BRPI0701245A2 (pt) 2006-03-31 2007-03-29 novos tubos capilares sem fim em liga de alumÍnio, novas vÁlvulas de laminaÇço compreendendo tubos capilares em liga de alumÍnio, e nova liga de alumÍnio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06112083.8A EP1840487B1 (de) 2006-03-31 2006-03-31 Endloskapillarrohr in Aluminiumlegierung und Drosselventil mit diesen Endloskapillarrohr in Aluminiumlegierung

Publications (2)

Publication Number Publication Date
EP1840487A1 EP1840487A1 (de) 2007-10-03
EP1840487B1 true EP1840487B1 (de) 2013-10-30

Family

ID=36910937

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06112083.8A Revoked EP1840487B1 (de) 2006-03-31 2006-03-31 Endloskapillarrohr in Aluminiumlegierung und Drosselventil mit diesen Endloskapillarrohr in Aluminiumlegierung

Country Status (4)

Country Link
EP (1) EP1840487B1 (de)
BR (1) BRPI0701245A2 (de)
PL (1) PL1840487T4 (de)
SI (1) SI1840487T1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11498104B2 (en) 2019-08-05 2022-11-15 Samsung Electronics Co., Ltd. Extrusion apparatus and method for manufacturing aluminum capillary tube using same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20090878A1 (it) 2009-05-19 2010-11-20 Aro Tubi Trafilerie S P A Processo di ottenimento di dispositivi per il trattamento del fluido refrigerante in macchine frigorifere e di dispositivi così ottenuti
IT201800006938A1 (it) 2018-07-05 2020-01-05 Procedimento continuo di produzione di capillari in leghe non-ferrose.
CN110038913A (zh) * 2019-04-26 2019-07-23 张家港保税区亚鑫精密制管有限公司 汽车空心稳定杆用金属管加工工艺

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US11498104B2 (en) 2019-08-05 2022-11-15 Samsung Electronics Co., Ltd. Extrusion apparatus and method for manufacturing aluminum capillary tube using same

Also Published As

Publication number Publication date
SI1840487T1 (sl) 2014-05-30
BRPI0701245A2 (pt) 2008-11-11
EP1840487A1 (de) 2007-10-03
PL1840487T3 (pl) 2014-06-30
PL1840487T4 (pl) 2014-06-30

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