Method for preparing a surface for applying a thermally sprayed layer

The process as claimed in claim 16, wherein the grooves have a trapezoidal to rectangular cross section.

The process as claimed in claim 16, wherein a diameter of the wires is greater than a groove width.

The process as claimed in claim 16, wherein a diameter of the wires corresponds to at least one times a groove spacing.

The process as claimed in claim 16, wherein a ratio of a groove depth to a groove width is between 0.2 and 1.

The process as claimed in claim 16, wherein a ratio of a groove spacing to a groove width is between 1.2 and 4.

The process as claimed in claim 16, wherein a groove spacing is between 0.1 mm and 1 mm.

The process as claimed in claim 16, wherein the brush is operated at a high rotational speed of about 3000 to 6000 revolutions per minute and is displaced laterally with an axis of rotation thereof at such a constant parallel distance in relation to the surface of the workpiece, and in such a manner that ends of the wires impinge on adjacent surface regions on the workpiece in bursts at an oblique angle of less than 90° in quick succession.

The process as claimed in claim 16, wherein the wires are mounted so as to be freely rotatable in a direction of rotation of the brush and are bent resiliently when they impinge on the workpiece, slide along the surface to be machined with the ends thereof, are then immediately lifted off from the surface owing to the resilient bending and, when the brush continues to rotate, are thrown back counter to the direction of rotation, in order to then return to their radial orientation for renewed surface contact as a result of the effect of centrifugal force.

A rotating brush comprising a substantially cylindrical, rotationally symmetrical brush body having a multiplicity of axially parallel support bars, which are clamped over a circumference of the brush between brush disks positioned at the ends, and which each support a multiplicity of wires arranged close together in an axial direction of the brush.

(canceled)

(canceled)

A process for preparing a surface of a metal workpiece for application of a sprayed layer comprising:

• forming a series of alternating grooves and webs in the workpiece;
• and
• operating a brush having a multiplicity of wires in such a manner that the wires impinge parallel to the grooves to plastically deform material at a surface of the webs toward the grooves and thereby form undercuts in the grooves.

A metal workpiece having a surface prepared for application of a sprayed layer produced by a process comprising the steps of:

• forming a series of alternating grooves and webs in the surface of workpiece;
• and
• operating a brush having a multiplicity of wires in such a manner that the wires impinge parallel to the grooves to plastically deform material at a surface of the webs toward the grooves and thereby form undercuts in the grooves.