Abstract A method of manufacturing light metal pistons having a dished combustion chamber arranged in the piston-head. Initially a piston having a cylindrical recess is provided and a charge carrier beam is applied to the piston head in the region of the eventual rim of the combustion chamber. The carrier beam provides two concentric refined remelting seams which overlap by simultaneously causing the carrier beam to oscillate in a direction transverse to the path of the concentric seams. The recess then is machined out to form the dished combustion chamber. The machining operation also removes part of the refined remelting zone provided by the overlapping seams to leave the combustion chamber with a rim composed of the refined remelting zone.
A method of manufacturing light metal pistons having a dished combustion chamber arranged in the piston-head, including providing a piston having a recess therein constituting the basis of the combustion chamber, applying to the surface of the piston in which said recess is provided a charge carrier beam to produce at least two concentric remelting seams, simultaneously oscillating said charge carrier beam transversely of the path of said seams to allow overlapping of said seams to form a remelting zone and machining said recess to remove part of the piston material and part of the remelting zone, wherein the piston is formed having the dished combustion chamber, the rim of which chamber is defined by the remelting zone.
Claim 2
Independent Claim
118 words
A method of manufacturing light metal pistons having a dished combustion chamber arranged in the piston-head, including providing a piston having a recess therein constituting the basis of the combustion chamber, applying to the surface of the piston in which said recess is provided a charge carrier beam to produce at least two concentric remelting seams, simultaneously oscillating said charge carrier beam transversely of the path of said seams to allow overlapping of said seams to form a remelting zone and machining said recess to remove part of the piston material and part of the remelting zone, wherein the piston is formed having the dished combustion chamber, the rim of which chamber is defined by the remelting zone.
Claim 3
Dependent Claim
19 words
A method as claimed in claim 1, in which the oscillatory motion of the charge carrier beam is circular.
Claim 4
Dependent Claim
18 words
A method as claimed in claim 1, in which the oscillatory motion of the charge carrier is eliptical.
Claim 5
Dependent Claim
20 words
A method as claimed in claim 1, in which three concentric remelting seams are provided to form the remelting zone.