F - Mech Eng,Light,Heat,Weapons – 16 – J
Patent
F - Mech Eng,Light,Heat,Weapons
16
J
26/152
F16J 1/04 (2006.01) B23P 15/10 (2006.01) F02F 3/00 (2006.01) F02F 3/22 (2006.01) F16J 1/00 (2006.01)
Patent
CA 1240132
ABSTRACT OF THE DISCLOSURE A piston is formed in two parts. The main part is formed by gravity die casting from aluminium or aluminium alloy and a second part of the piston is formed by a squeeze casting process to produce a material which is stronger and more resistant than the gravity die cast aluminium or aluminium alloy. At least one piston ring groove is formed in the second part. The two parts are then electron beam welded together to form the complete piston. The squeeze cast portion may be reinforced with whiskers or fibes to further improve its properties. This method of construction has the benefit that only the minimum amount of the piston is formed by the more expensive and time- consuming squeeze casting process so that parts of the piston which do not require the improved properties given by squeeze casting are simply gravity die cast. This is of particular benefit in large diesel pistons.
482639
A. E. Plc
Bereskin & Parr
LandOfFree
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