Patent ID: 7921555

Claim:
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.