לייזר הונינג -הטכנולוגיה באאודי .

[proxima]

75% הפחתה בצריכת שמן , 90% הפחתה בשחיקת דפנות הצילנדרים ורינגים , והכל באמצעות אור .

לא בדיוק אור נראה ..מדובר בעיבוד באמצעות לייזר UV , מין הוננינג סופר-עדין ומדויק לעומת המכני .

לא הולך לתרגם את כל הכתבה ,בגדול:

 

תהליך ההונינג המכני יוצר שכבה החוסמת את גבישי הגרפיט מהמשטח החיצוני ,פולסי הלייזר גורמים לחלקיקי הגרפיט שביציקת הברזל לבלוט החוצה ,והחומר הנקבובי יודעים לאגור בתוכו יותר שמן המנוע ,ובנוסף נוצרת שכבה חזקה יותר .

( הטכנולוגיה מיושמת כבר מ 2004 במנוע ה 3 ליטר TDI )

חלק מהכתבה :

 

When the UV laser pulses hit the surface of the cylinder bore, which has been pre-machined to a minimal roughness by honing, material is vaporised and the graphite releases are opened up. Queitsch explains that in this way a micro-hydrodynamic surface structure is formed, which serves to retain oil. That means that oil can collect more easily in the microscopically small "hollows" that are created in this way. At the same time the surface is melted in place by the laser down to a thickness of one to two microns (that is one or two thousandths of a millimetre). "A vaporized metal plasma is created in the process. Plasmas are vapours or gases containing tremendous energy. This energy produces intense extending pressure, by means of which 16 to 18 % nitrogen is impregnated into the melted layer.

This leads to the instantaneous solidifying of the thin melted layer as soon as the laser pulse ends, and hence to a nanocrystalline structure. "The high nitrogen content and the nanocrystalline structure permanently improve the resistance of the cylinder bore to wear and corrosion, and the material also gains ceramic characteristics as a result of the high nitrogen content," explains Lindner.

When the engine is running the solidified nanocrystalline structure is transformed by the heat of combustion and friction in the peripheral area (approx. 150 to 200 nanometres) into an extremely fine structure of iron crystals with carbon and nitrogen. Lindner: "Structures of this type have superplastic properties. That means that the release of atoms from the atomic bond is inhibited by its ability to give. This results in increased resistance to wear. This self-conditioning effect is a tribological revolution!"

With the cylinder bore exposed to the UV laser, the scientists were able to demonstrate a reduction in wear to the cylinder bore and piston rings of up to 90 %, depending on the operating condition of the engine, when compared with a conventionally well honed cylinder bore. "And reduced wear also means reduced loss of performance resulting from friction within the engine, and hence fuel savings," says Lindner.

Oil consumption measurements in a comparison with the conventional honed surface produced the following results: With conventional honing the oil consumption amounted to between 20 and 50 grammes per hour over a running period of 800 hours, with significant initial oil consumption, and rising after a period of 400 hours. In the case of the UV laser-exposed cylinder bore, stable oil consumption of 9 grammes per hour was recorded over a period of 820 hours, and the initial oil consumption familiar with honing did not arise.

 

 

[proxima]

סבבה.

[Dani57]

מדהים לאן הגענו! מתי אצלנו ?

אצל החרט הקרוב לביתך ובמחיר הוגן?

[proxima]

טכנולוגיה בלעדית של אודי .

אצלנו ? אמור להיות לפחות בכל מכונית מ 2004 המצוידת במנוע 3000cc TDI .