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Found results for
 patents
1.
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INTERNAL COMBUSTION ENGINE PISTON AND METHOD FOR MANUFACTURING SAME
| Application Number |
JP2015073143 |
| Publication Number |
2016/027808 |
| Status |
In Force |
| Filing Date |
2015-08-18 |
| Publication Date |
2016-02-25 |
| Owner |
- ART METAL MFG. CO., LTD. (Japan)
- ADVANCED LASER TECHNOLOGY RESEARCH CENTER CO., LTD. (Japan)
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| Inventor |
- Narusawa, Hiroshi
- Kutsuna, Muneharu
- Watanabe, Tadashi
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Abstract
[Problem] To provide an internal combustion engine piston having improved strength in a selected portion thereof, and a method for manufacturing the same. [Solution] The present invention solves said problem by an internal combustion engine piston 1 which at least has a portion having a dislocation density within a range of 109-1012 cm/cm3 inclusive and in which precipitates having a longer diameter of 0.2 μm or fine precipitates having a longer diameter less than 0.2 μm are produced by heating the portion having the dislocation density. The portion having the dislocation density exists within a depth range of 1 mm from the surface. The portion having the dislocation density may also be any one portion or at least two portions selected from the outer circumferential surface of the piston, the top surface thereof, the inner surface thereof, and the inner circumferential surface of a pin hole for inserting a piston pin. Also, it is preferable that the portion having the dislocation density be made of an Al-Si based alloy or an Al-Cu based alloy in which fine precipitates are produced by heating.
IPC Classes ?
- F02F 3/00 - Pistons
- B23K 26/00 - Working by laser beam, e.g. welding, cutting or boring
- B23K 26/122 - Working by laser beam, e.g. welding, cutting or boring in a special environment or atmosphere, e.g. in an enclosure in a liquid, e.g. underwater
- B23K 26/356 - Working by laser beam, e.g. welding, cutting or boring for surface treatment by shock processing
- F16J 1/01 - PistonsTrunk pistonsPlungers characterised by the use of particular materials
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2.
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PISTON AND PROCESS FOR PRODUCING PISTON
| Application Number |
JP2014078040 |
| Publication Number |
2015/064434 |
| Status |
In Force |
| Filing Date |
2014-10-22 |
| Publication Date |
2015-05-07 |
| Owner |
- AISIN SEIKI KABUSHIKI KAISHA (Japan)
- ADVANCED LASER TECHNOLOGY RESEARCH CENTER CO., LTD. (Japan)
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| Inventor |
- Niimi, Takuya
- Okamoto, Akihiro
- Sugano, Keiki
- Okazaki, Ryo
- Kutsuna, Muneharu
- Saito, Kiyotaka
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Abstract
This piston is for use in internal combustion engines and comprises: a piston main body constituted of aluminum or an aluminum alloy; and a modification layer that has been formed on the surface of the portions of the piston main body which are to be strengthened, that has a surface constituted of aluminum oxide formed by plasma oxidation, and that has residual compression stress imparted thereto.
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