Thread former having flaring ridges

A method for producing an internal thread, the method comprising:

• pressing in a thread in a work piece, the thread being pressed in using one or more pressing lobes of a rotating tool;
• then, after pressing in the thread, forming an interspace between the thread using a flaring ridge of the rotating tool;
• and
• iteratively repeating the steps of pressing in the thread and then forming the interspace between the thread, wherein
• the rotating tool is for non-cutting production or reworking of the thread in or on the workpiece, the rotating tool including
• at least one forming area which is rotatable or rotates about a tool axis for the non-cutting production or reworking of the thread, wherein the forming area includes
• the one or more pressing lobes, which are protruding or projecting radially outwards away from the tool axis for producing or reworking the thread by pressing the one or more pressing lobes into the workpiece surface, the one or more pressing lobes being arranged in succession along a shaping curve that spirally encircles the tool axis;
• a flaring ridge arranged in the forming area and protruding or projecting radially outwards away from the tool axis;
• a pitch of the shaping curve corresponding to a pitch of the thread;
• and
• the pressing lobes including at least one pressing ridge adjacent to the flaring ridge, a height of the flaring ridge being lower than a height of the pressing ridge, and the height of the flaring ridge being a height at which an internal thread core diameter is formed.