EP0871791A1 - Procede de fabrication de tuyaux minces - Google Patents

Procede de fabrication de tuyaux minces

Info

Publication number
EP0871791A1
EP0871791A1 EP96930115A EP96930115A EP0871791A1 EP 0871791 A1 EP0871791 A1 EP 0871791A1 EP 96930115 A EP96930115 A EP 96930115A EP 96930115 A EP96930115 A EP 96930115A EP 0871791 A1 EP0871791 A1 EP 0871791A1
Authority
EP
European Patent Office
Prior art keywords
tube
thick
carried out
walled
hot forming
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.)
Granted
Application number
EP96930115A
Other languages
German (de)
English (en)
Other versions
EP0871791B1 (fr
Inventor
Bernhard Commandeur
Rolf Schattevoy
Klaus Hummert
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.)
WKW AG
Original Assignee
Erbsloeh AG
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 Erbsloeh AG filed Critical Erbsloeh AG
Publication of EP0871791A1 publication Critical patent/EP0871791A1/fr
Application granted granted Critical
Publication of EP0871791B1 publication Critical patent/EP0871791B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • C22F1/043—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 of alloys with silicon as the next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0408—Light metal alloys
    • C22C1/0416—Aluminium-based alloys
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/123—Spraying molten metal

Definitions

  • the invention relates to a method for producing thin-walled tubes, which consist of a heat-resistant and wear-resistant aluminum material, in particular for use as cylinder liners for internal combustion engines.
  • Liner bushings are components subject to wear and tear that are inserted, pressed or cast into the cylinder openings of the crankcase of the internal combustion engine.
  • the problem was initially solved by a cast cylinder block made of a hypereutectic AlSi alloy.
  • the silicon content is limited to a maximum of 20% by weight.
  • Another disadvantage of the casting process is that silicon solid particles with relatively large dimensions (approx. 30-80 ⁇ m) are precipitated during the solidification of the melt. Due to their size and their angular and sharp-edged shape, they lead to wear on the pistons and piston rings. It is therefore necessary to protect the pistons and the piston rings with appropriate coatings / coatings.
  • the contact area of the Si particles to the piston / piston ring is leveled by mechanical processing.
  • a cylinder block according to DE 42 30 228, which is cast from a hypereutectic AlSi alloy and provided with liners made of hypereutectic AlSi alloy material, is less expensive. The aforementioned problems are not solved here either.
  • the structure of the Si grains has to be changed. It is known that aluminum alloys that cannot be produced using casting technology can be made to measure using powder metallurgy processes or spray compaction.
  • hypereutectic AlSi alloys can be produced which, due to the high Si content, the fineness of the Si particles and the homogeneous distribution, have very good wear resistance and are given the required heat resistance through additional elements such as Fe, Ni or Mn.
  • the Si primary particles present in these alloys have a size of approximately 0.5 to 20 ⁇ m. The alloys produced in this way are therefore suitable for a liner material.
  • EP 0 635 318 discloses a method for producing liners from a hypereutectic AlSi alloy.
  • the liner is manufactured by extrusion at very high pressures and extrusion speeds of 0.5 to 12m / min.
  • very high press speeds are necessary. It has been shown that with such hard-to-press alloys and the small wall thicknesses of the liners to be achieved, the high pressing speeds lead to the tearing of the profiles during extrusion.
  • the spray compacting of hollow cylinders is known from WO 87/03012.
  • tube blanks For example, the production of tube blanks with wall thicknesses of 25 to 40 mm is described.
  • the object of the invention is therefore to provide an improved and far more cost-effective method for the production of thin-walled tubes, in particular for cylinder liners of internal combustion engines, the liner produced being said to have the required improvements in properties with regard to wear resistance, heat resistance and reduction of pollutant emissions.
  • the object is achieved by a method with the method steps specified in claim 1.
  • the required tribological properties are achieved in particular in that silicon particles are present in the material as primary excretions in a size range from 0.5 to 20 ⁇ m or as added particles in a size range up to 80 ⁇ m.
  • processes must be used which permit a much higher solidification rate of a high-alloy melt than is possible with conventional casting processes.
  • spray compacting This includes the spray compacting process (hereinafter "spray compacting").
  • an aluminum alloy melt that is high-alloyed with silicon is atomized and cooled in a nitrogen jet at a cooling rate of 1000 ° C./s.
  • the powder particles, some of which are still liquid, are sprayed onto a carrier tube made of a similar material or a conventional aluminum material (e.g. AlMgSi0.5) rotating horizontally around the longitudinal axis.
  • the carrier tube which preferably has wall thicknesses of 2-3 mm, is moved linearly under the spray jet during the process. By superimposing the rotational and translational movement of the carrier tube, a cylindrical tube with a fixedly specified inside diameter is created. The outer diameter results from the feed rate and the effective compacting rate. In this way, pipes with wall thicknesses of 6 to 20 mm can be produced. Suitable supply and guide systems for the carrier tubes enable quasi-continuous production to be carried out.
  • Si primary precipitates up to 20 ⁇ m in size are created in this spray compacting process.
  • the size of the Si precipitate can be adjusted by means of the "gas to metal ratio" (standard cubic meters of gas per kilogram of melt), with which the solidification rate in the process can be adjusted. Due to the high solidification rates and the supersaturation of the melt, Si contents of the alloys of up to 40% by weight can be achieved. Due to the Rapid quenching of the aluminum melt in the gas jet, the supersaturation state in the pipe obtained is virtually “frozen".
  • the spray compacting process also offers the possibility of introducing particles into the bolt via a particle injector that were not present in the melt. Since these particles can have any geometry and any size between 2 ⁇ m and 400 ⁇ m, there are a multitude of setting options for a structure. These particles can e.g. Si particles in the range from 2 ⁇ m to 400 ⁇ m or oxide-ceramic (e.g. AI2O3) or non-oxide-ceramic particles (e.g. SiC, B4C, etc.) in the aforementioned particle size range, as they are commercially available and useful for the tribological aspect.
  • oxide-ceramic e.g. AI2O3
  • non-oxide-ceramic particles e.g. SiC, B4C, etc.
  • the structure of the spray-compacted pipe can be changed by subsequent aging annealing.
  • the structure can be adjusted to an Si grain size of 2 to 30 ⁇ m by annealing, as is desirable for the required tribological properties.
  • the growth of larger Si particles during the annealing process is caused by diffusion in the solid at the expense of smaller Si particles. This diffusion depends on the aging temperature and the duration of the annealing treatment. The higher the temperature selected, the faster the Si grains grow. Suitable temperatures are around 500 ° C, with an annealing time of 3-5 hours being sufficient.
  • the wall thickness is reduced to the required final dimensions by hot forming using various methods.
  • the process temperatures are between 300 ° C and 550 ° C.
  • the hot forming not only serves for forming, but also for closing the process-related residual porosity (1 - 5%) in the spray-compacted starting material.
  • the pipe formed to the end wall thickness is then cut into pipe sections of the required length.
  • the method according to the invention has the advantage that the material for the liner can be tailored. At the same time, the high outlay involved in the single-stage extrusion of thin-walled pipes is successfully avoided, both in terms of pressure and speed, as well as product quality and economy, by the production method described.
  • Example 1
  • An alloy of the composition AlSi25Cu2.5MglNil is melt compacted at a melt temperature of 830 ° C with a gas / metal ratio of 4.5m3 / kg (standard cubic meters of gas per kilogram of melt) by spray compacting on a carrier tube (inner diameter: 69.5 mm, wall thickness: 2.0 mm) at a feed rate of approx. 0.6 m / min to a tube with a wall thickness of 15.0 mm.
  • the Si precipitates in the size range from l ⁇ m to lO ⁇ m are present under the conditions mentioned.
  • the spray-compacted tube is subjected to an annealing treatment of 4 hours at 520 ° C.
  • the Si deposits are in the size range from 2 ⁇ m to 30 ⁇ m.
  • the spray-compacted tube is formed from an outside diameter of 98 mm to an outside diameter of 79 mm and an inside diameter of 69 mm, which is formed by a mandrel. The degree of deformation is sufficient to completely close the aforementioned residual porosity in the spray-compacted tube. No other structural change occurs during the round kneading.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Powder Metallurgy (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Insulators (AREA)
EP96930115A 1995-09-01 1996-08-28 Procédé de fabrication de chemises de cylindre Expired - Lifetime EP0871791B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19532252 1995-09-01
DE19532252A DE19532252C2 (de) 1995-09-01 1995-09-01 Verfahren zur Herstellung von Laufbuchsen
PCT/EP1996/003780 WO1997009459A1 (fr) 1995-09-01 1996-08-28 Procede de fabrication de tuyaux minces

Publications (2)

Publication Number Publication Date
EP0871791A1 true EP0871791A1 (fr) 1998-10-21
EP0871791B1 EP0871791B1 (fr) 2000-11-29

Family

ID=7770982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96930115A Expired - Lifetime EP0871791B1 (fr) 1995-09-01 1996-08-28 Procédé de fabrication de chemises de cylindre

Country Status (13)

Country Link
US (2) US6136106A (fr)
EP (1) EP0871791B1 (fr)
JP (1) JP3664315B2 (fr)
KR (1) KR100258754B1 (fr)
CN (1) CN1066493C (fr)
AT (1) ATE197821T1 (fr)
BR (1) BR9610546A (fr)
DE (2) DE19532252C2 (fr)
DK (1) DK0871791T3 (fr)
ES (1) ES2152560T3 (fr)
GR (1) GR3035368T3 (fr)
PT (1) PT871791E (fr)
WO (1) WO1997009459A1 (fr)

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CN114669617B (zh) * 2022-05-27 2022-08-26 江苏中天科技股份有限公司 一种特耐热铝合金耐张管材

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JPH11501991A (ja) 1999-02-16
ATE197821T1 (de) 2000-12-15
WO1997009459A1 (fr) 1997-03-13
US6136106A (en) 2000-10-24
JP3664315B2 (ja) 2005-06-22
PT871791E (pt) 2001-03-30
CN1066493C (zh) 2001-05-30
CN1194014A (zh) 1998-09-23
DE19532252A1 (de) 1997-03-06
KR19990043982A (ko) 1999-06-25
EP0871791B1 (fr) 2000-11-29
ES2152560T3 (es) 2001-02-01
DK0871791T3 (da) 2000-12-27
GR3035368T3 (en) 2001-05-31
US6485681B1 (en) 2002-11-26
BR9610546A (pt) 1999-07-06
DE19532252C2 (de) 1999-12-02
DE59606173D1 (de) 2001-01-04
KR100258754B1 (ko) 2000-06-15

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