Method and tool for creating a through-thread

A method for creating a through-thread with a predefined thread pitch and with a predefined thread profile with at least one countersink in a workpiece by means of a tool, wherein:

• a) the tool can be rotated about a tool axis (A) extending through the tool and moved axially in relation to the tool axis by means of a turning device,
• b) the tool has, sequentially in the direction of an end face thereof,
• b1) a shank region for coupling to the turning device,
• b2) at least one neck region for transporting away chips,
• b3) a thread creation region with a thread creation means for creating the through-thread, and
• b4) an end region having the end face, wherein the end region comprises a drilling region for drilling a through-hole, wherein the drilling region comprises at least two end cutting edges,
• c) to create the through-thread, the thread creation means is moved in a screw-in movement in an axial forward direction (VR) through the workpiece from a first workpiece side to a second workpiece side opposite the first workpiece side such that the end face projects out of the workpiece, wherein the thread creation means is moved through the workpiece, along a first line, which is a helical line, wherein the through-thread created with the aid of end-side thread-cutting teeth, wherein the thread-cutting teeth jointly create the through-threaded in the screw-in movement, wherein the thread-cutting teeth jointly form the thread creation means, wherein the thread-cutting teeth are arranged on the end cutting edges,
• d) then, to create at least one countersink, the thread creation means is moved in a countersinking movement, along a second line that differs from the first line, wherein the countersinking movement takes place in the forward direction and/or in the backward direction and/or as reverse countersinking, wherein a feed is reduced during the countersinking movement in such a way that the feed during one revolution of the tool is less than the predefined thread pitch, wherein the thread-cutting teeth jointly create the countersink in the countersinking movement, wherein the thread-cutting teeth jointly form both the countersinking means and create the through-thread, wherein the countersink is cylindrical, with a diameter which is greater than the maximum diameter of the thread profile, wherein the countersinking movement is a braking movement, wherein the braking movement takes place in defined partial steps as braking steps, wherein in each braking step, a synchronization of the axial feed and the rotation angle in accordance with the control of a threading process is set or programmed such that an associated predetermined function with an associated value interval over an associated rotation angle interval is assigned or programmed to each braking step, and
• e) for subsequent withdrawal, the thread creation means is moved back through the workpiece in a screw-out movement in an axial backward direction (RR), along the first line.