Piston for an internal combustion engine and method for its production

Method for the production of a piston (1) for an internal combustion engine,

• comprising the following method steps:
• producing a salt core in the shape of a ring-shaped cooling channel (9, 9′, 9″), having two formed-on parts in the shape of pin boss cooling channels (13, 13′, 17) disposed on two opposite sides of the salt core, directed radially inward,
• providing a casting mold for the piston (1), having two formed-on parts complementary to the pin bosses (7), lying opposite one another, and having two slides that can be pushed into the casting mold in the radial direction, which lie opposite one another, for two pin bores (8) disposed in the pin bosses (7),
• laying and attaching the salt core into the casting mold, in such a manner that the formed-on parts for the pin boss cooling channels (13, 13′, 17) come to lie on the side of the formed-on parts intended for the pin bosses (7) that faces the piston crown,
• pushing in the slide intended for the pin bores (8),
• filling the casting mold with the piston material present in liquid form, thereby surrounding the salt core,
• inserting a slide for forming the piston interior chamber (14),
• removing the piston blank from the casting mold,
• drilling at least one oil feed channel (10) that opens into the cooling channel (9, 9′, 9″) and at least one oil drain channel that stands in connection with the cooling channel (9, 9′, 9″),
• washing the salt core out of the cooling channel (9, 9′, 9″) by way of the oil feed channel (10) and the oil drain channel, and
• finishing the piston (1) by means of a machining production method.