Method for the production of a single part piston and a piston produced by such a method

Method for the production of a one-part piston (20) for an internal combustion engine, from a piston blank (10), having a cooling channel (15) that runs in ring shape on the circumference of a piston head (11), and is open towards the bottom, and a ring-shaped recess (16) configured between the piston head (11) and a piston skirt (13), whereby the piston head (11) and the piston skirt (13) are connected with one another by means of pin bosses (14), and whereby the ring-shaped recess (16) and the cooling channel (15) are worked into the piston blank (10) by means of cutting machining, and subsequently, the outer contour is finished and the cooling channel is closed off, wherein for cutting machining of the cooling channel (15), a tool (17) is moved into the region of the cooling channel (15), while the piston is rotating, in an arc-shaped pivoting movement (A), through the recess (16), and the cooling channel (15) is machined out.