The manufacture of pistons
    4.
    发明公开
    The manufacture of pistons 失效
    生产活塞。

    公开(公告)号:EP0178747A1

    公开(公告)日:1986-04-23

    申请号:EP85303736.4

    申请日:1985-05-28

    申请人: AE PLC

    摘要: A piston is formed in two parts (10, 11). The main part (10) is formed by gravity die casting from aluminium or aluminium alloy and a second part (11) 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 alloy. At least one piston ring groove (14a) is formed in the second part (11). The two parts are then electron beam welded together to form the complete piston. The squeeze cast portion may be reinforced with whiskers or fibers 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.