Method for producing one or more concave cut-outs on a main body which is, in particular, substantially cylindrical, armature, keeper plate, and electromagnetic actuator

A method for producing one or more concave cut-outs (32) on a cylindrical main body (22) of a magnetic armature (40), a push rod (72), or a magnetic keeper plate (62) made of a magnetic, magnetized or magnetizable material, comprising the following steps:

• providing the cylindrical main body (22), which has a first axis of rotation (T1);
• rotating the cylindrical main body (22) around the first axis of rotation (T1) in a first rotational direction by means of a lathe (24);
• rotating a striking tool (26), which is provided with a number of fly cutters (30), around a second axis of rotation (T2), which extends in parallel and offset in relation to the first axis of rotation (T1) in a second rotational direction, which is opposite to the first rotational direction, so that the fly cutter (30) and the main body (22) primarily move in the same direction within an engagement zone (E), in such a way that the fly cutter (30) engages in a material-removing manner in the main body (22) to produce the one or more concave cut-outs (32);
• and
• moving the striking tool (26) in relation to the cylindrical main body (22) along the second axis of rotation (T2),
• wherein the one or more concave cut-outs (32) comprise a plurality of concave cut-outs (32), and
• wherein a speed at which the striking tool (26) is moved along the second axis of rotation (T2) is selected in such a way that two adjacent ones of the plurality of concave cut-outs (32) merge into one another without interruption, so that a groove (34) is formed, which consists of a plurality of merging ones of the concave cut-outs (32).