Cast-In Cylinder Liners Designs to Improve Bonding and Shear Strength for Aluminum Block Mahle Brazil

Format:

Conference/Event

Author/Creator:

Soares, Soares, author.

Contributor:

Maurizi, Marco

Rejowski, Edney

Conference Name:

21st SAE Brasil International Congress and Exhibition (2012-10-02 : Sao Paulo, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

The tendency to use aluminum alloys to replace conventional graycast irons (GCI) materials in engine blocks of passenger cars isgaining more and more importance driven by reduction of engineweight to achieve expectation for lowering fuel consumption and CO₂emissions.Cast-in cylinder liners are commonly applied inside of aluminumengine blocks with designs of the outer surface usually selectedthrough analysis of the aluminum casting process (e.g., highpressure die casting, precision sand cast), geometry complexity,thermal and mechanical loads.A good quality of clamping (bonding and shear strength) betweenthe cast-in cylinder liner and aluminum block might guarantee areliable heat transfer and thus low bore distortion. The goodclamping can also contribute to improve the final machining of theliner after block casting.The most effective variants of cast-in cylinder liner designswere selected for the evaluation of clamping performance. Thevariants were based on conventional thread turned, threaded withaddition of undercuts profile, and two designs based on as-castrough surface with different roughness depth (0.62 and 1.26mm).The results showed that the as-cast rough surface with roughnessdepth of 1.26 mm reached maximum values for bonding strength (30MPa) and shear strength (98 MPa) due to better penetration of themelted aluminum into the rough volume surface. The threaded withaddition of undercuts profile design also meets higher targets inthe bonding (22.7 MPa) and shear strength (37 MPa) when compared toconventional machined liners. The good clamping performance addedwith freedom of outer diameter that enable different shapes inconnection with tighter tolerance, places this design as promisingtechnology for modern aluminum engine blocks with low inter-boredistance

Notes:

Vendor supplied data

Publisher Number:

2012-36-0449

Access Restriction:

Restricted for use by site license