DE10337962B4 - Method for hardening the groove surfaces, in particular the groove flanks of the annular grooves of a steel piston - Google Patents
Method for hardening the groove surfaces, in particular the groove flanks of the annular grooves of a steel piston Download PDFInfo
- Publication number
- DE10337962B4 DE10337962B4 DE2003137962 DE10337962A DE10337962B4 DE 10337962 B4 DE10337962 B4 DE 10337962B4 DE 2003137962 DE2003137962 DE 2003137962 DE 10337962 A DE10337962 A DE 10337962A DE 10337962 B4 DE10337962 B4 DE 10337962B4
- Authority
- DE
- Germany
- Prior art keywords
- groove
- hardening
- laser beam
- flanks
- piston
- 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.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2221/00—Treating localised areas of an article
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Verfahren zum Härten der Nutflächen, insb. der Nut1) mittels eines Laserstrahles (6), – der bezogen auf die Zylindermantelflächen des Kolbens (1) etwa in tangentialer Richtung auf die Nutflanken (2) gerichtet wird, und – der bezogen auf die Nutflankenebene mit einem bestimmten Winkel α auf die Nutflanken (2) gerichtet wird, dadurch gekennzeichnet, – dass ein Laserstrahl (6) mit einer Wellenlänge von weniger als 5 μm verwendet wird, und – dass der Winkel α so groß gewählt wird, dass unter Berücksichtigung der vorliegenden Nutgeometrie ein für geforderte Härteeigenschaften optimaler Absorptionsgrad der Laserstrahlenergie erreicht wird.Method for hardening the groove surfaces, in particular the groove1) by means of a laser beam (6), - which is directed approximately in a tangential direction to the groove flanks (2) in relation to the cylinder jacket surfaces of the piston (1), and - which in relation to the groove flank plane with A certain angle α is directed onto the groove flanks (2), characterized in that - that a laser beam (6) with a wavelength of less than 5 μm is used, and - that the angle α is chosen so large that, taking into account the present Groove geometry an optimal degree of absorption of the laser beam energy is achieved for the required hardness properties.
Description
Die Erfindung betrifft ein Verfahren zum Härten der Nutflächen, insb. der Nutflanken der Ringnuten eines Stahlkolbens nach dem Oberbegriff des Anspruches 1.The invention relates to a method for hardening the groove surfaces, esp. The groove flanks of the annular grooves of a steel piston according to the preamble of
Aus der Offenlegungsschrift
Eine solche Maßnahme kann bspw. in der Polarisierung des verwendeten Laserlichtes bestehen, sodass der ”Brewster-Effekt” ausgenutzt werden kann, wobei eine besonders hohe Absorption der Laserstrahlung erreicht wird, wenn der polarisierte Laserstrahl unter einem bestimmten Einstrahlwinkel, dem ”Brewster-Winkel”, auf die zu härtende Oberfläche gerichtet wird, der von der Art des zu härtenden Materials und von der Wellenlänge des Laserlichtes abhängt. In einer weiteren Maßnahme kann von dem Naturgesetz Gebrauch gemacht werden, dass insb. bei Stahl die Absorption der Laserenergie von Laserstrahlen bei abnehmender Wellenlänge stark zunimmt. In dem vorliegenden Patentdokument zum Stand der Technik sind aber weder Aussagen zum Polarisationszustand des verwendeten Laserlichtes noch über dessen Wellenlänge enthalten.Such a measure may, for example, consist in the polarization of the laser light used, so that the "Brewster effect" can be exploited, a particularly high absorption of the laser radiation being achieved if the polarized laser beam passes under a certain angle of incidence, the "Brewster angle". , is directed to the surface to be cured, which depends on the type of material to be cured and on the wavelength of the laser light. In a further measure, use can be made of the law of nature that, especially in the case of steel, the absorption of the laser energy of laser beams increases greatly as the wavelength decreases. In the present patent document, however, neither statements on the polarization state of the laser light used nor on its wavelength are included.
Es ist somit Aufgabe der vorliegenden Erfindung, ein Verfahren zum Härten der Nutflächen, insb. der Nutflanken der Ringnuten eines Stahlkolbens anzugeben, bei dem auf eine Oberflächenbeschichtung der zu härtenden Nutbereiche zur Erhöhung der Absorption verzichtet wird, und bei dem angegeben wird, mit welcher hierzu alternativen Maßnahme eine zum Härten der Nutbereiche ausreichende Oberflächentemperatur erzielbar ist.It is therefore an object of the present invention to provide a method for hardening the groove surfaces, esp. The groove flanks of the annular grooves of a steel piston, is waived in a surface coating of the groove regions to be cured to increase the absorption, and is specified in which this alternative measure a sufficient for curing the groove areas surface temperature can be achieved.
Gelöst wird diese Aufgabe mit den im Kennzeichen des Hauptanspruches stehenden Merkmalen.This problem is solved with the features in the characterizing part of the main claim.
Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the invention are the subject of the dependent claims.
Hierbei wird von letzterem Naturgesetz Gebrauch gemacht, wonach bei Stahl die Absorption der Laserenergie bei abnehmender Wellenlänge der Laserstrahlen so stark zunimmt, dass sich hierbei die Verwendung einer strahlungsabsorbierenden Oberflächenbeschichtung erübrigt. Gerade bei Laserstrahlen mit einer Wellenlänge von weniger als 5 μm ist die Zunahme des Absorptionsgrades besonders stark und erreicht bei Diodenlasern mit einer Wellenlänge von 0,8 bis 0,98 μm einen Spitzenwert. Aber auch der Einfallswinkel α beeinflusst den Absorptionsgrad des Laserlichtes dahingehend, dass im Allgemeinen mit dem Einfallswinkel der Absorptionsgrad steigt.In this case, use is made of the latter natural law, according to which the absorption of the laser energy increases so much with decreasing wavelength of the laser beams in steel, that in this case the use of a radiation-absorbing surface coating is unnecessary. Especially with laser beams with a wavelength of less than 5 microns, the increase in the absorption coefficient is particularly strong and reaches a peak value for diode lasers with a wavelength of 0.8 to 0.98 microns. However, the angle of incidence α also influences the degree of absorption of the laser light in that the degree of absorption generally increases with the angle of incidence.
Die Erfindung wird im Folgenden anhand der Zeichnungen beschrieben. Es zeigenThe invention will be described below with reference to the drawings. Show it
Ein Diodenlaser
Zum Zweck des Härtens wird bei entsprechender Bestrahlung der Nutflanken mit Laserlicht der Kolben
Die Verwendung des Diodenlasers
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 11
- Kolbenpiston
- 22
- Nutflankeflank
- 33
- Diodenlaserdiode laser
- 44
- Brennfleckfocal spot
- 55
- Abstanddistance
- 66
- Laserstrahllaser beam
- 6'6 '
- Achseaxis
- 77
- KolbenmittelpunktPiston center
- 88th
- Brennweitefocal length
- 99
- Ringnutring groove
- 1010
- Kanteedge
- 11, 11'11, 11 '
- Nutflankeflank
- 1212
- axiale Einhärtetiefeaxial hardening depth
- 1313
- radiale Einhärtetieferadial hardening depth
- 1414
- Nuttiefegroove depth
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003137962 DE10337962B4 (en) | 2003-08-19 | 2003-08-19 | Method for hardening the groove surfaces, in particular the groove flanks of the annular grooves of a steel piston |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003137962 DE10337962B4 (en) | 2003-08-19 | 2003-08-19 | Method for hardening the groove surfaces, in particular the groove flanks of the annular grooves of a steel piston |
Publications (2)
Publication Number | Publication Date |
---|---|
DE10337962A1 DE10337962A1 (en) | 2005-03-17 |
DE10337962B4 true DE10337962B4 (en) | 2012-04-26 |
Family
ID=34201659
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2003137962 Expired - Lifetime DE10337962B4 (en) | 2003-08-19 | 2003-08-19 | Method for hardening the groove surfaces, in particular the groove flanks of the annular grooves of a steel piston |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE10337962B4 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20090024680A (en) * | 2006-06-03 | 2009-03-09 | 카에스 콜벤슈미트 게엠베하 | Process for hardening an annular groove of a piston head by means of laser beams and a piston produced by the process |
DE102007054736A1 (en) | 2007-11-16 | 2009-05-20 | Mahle International Gmbh | Process for hardening groove flanks of the annular groove of a steel piston |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4139841A1 (en) * | 1990-12-12 | 1992-06-17 | Nissan Motor | METHOD FOR LASER CONVERSION HARDENING |
JPH04221012A (en) * | 1990-12-20 | 1992-08-11 | Mitsubishi Electric Corp | Laser beam hardening device |
FR2777019A1 (en) * | 1998-04-03 | 1999-10-08 | Peugeot | Treatment of the surface of a gray iron component |
DE19826508A1 (en) * | 1998-06-15 | 1999-12-16 | Rockinger Spezial Fab Joh | Towing vehicle with hardened fifth wheel plate, method for hardening a fifth wheel plate for a towing vehicle |
DE19918808A1 (en) * | 1999-04-26 | 2000-11-02 | Mahle Gmbh | Process for hardening ring grooves with laser beams |
EP1085231A1 (en) * | 1999-09-03 | 2001-03-21 | AlliedSignal Bremsbelag GmbH | Method and apparatus for heat treatment of friction surfaces |
-
2003
- 2003-08-19 DE DE2003137962 patent/DE10337962B4/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4139841A1 (en) * | 1990-12-12 | 1992-06-17 | Nissan Motor | METHOD FOR LASER CONVERSION HARDENING |
JPH04221012A (en) * | 1990-12-20 | 1992-08-11 | Mitsubishi Electric Corp | Laser beam hardening device |
FR2777019A1 (en) * | 1998-04-03 | 1999-10-08 | Peugeot | Treatment of the surface of a gray iron component |
DE19826508A1 (en) * | 1998-06-15 | 1999-12-16 | Rockinger Spezial Fab Joh | Towing vehicle with hardened fifth wheel plate, method for hardening a fifth wheel plate for a towing vehicle |
DE19918808A1 (en) * | 1999-04-26 | 2000-11-02 | Mahle Gmbh | Process for hardening ring grooves with laser beams |
EP1085231A1 (en) * | 1999-09-03 | 2001-03-21 | AlliedSignal Bremsbelag GmbH | Method and apparatus for heat treatment of friction surfaces |
US20020046789A1 (en) * | 1999-09-03 | 2002-04-25 | Hansjorg Grimme | Method and a device for the thermal treatment of friction lining surfaces |
Also Published As
Publication number | Publication date |
---|---|
DE10337962A1 (en) | 2005-03-17 |
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R020 | Patent grant now final |
Effective date: 20120727 |
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