Daimler Chrysler Ag

Daimler Ag

Tobias Hercke

Martin Hartweg

Karl Holdik

Patrick Izquierdo

Thomas Behr

Jens Boehm

Dezsoe Schilling

Norbert Rau

Wolfgang Pellkofer

Michael Seibold

Michael Gruener

Christoph Reckzügel

Manuel Michel

Thomas Kreisl

Stefan Schweickert

Jens BÖHM

Mareike Hahn

The invention relates to a process for roughening metal surfaces to improve adhesion of layers which are thermally sprayed thereon, in that in a first process step recesses or depressions () are introduced into the surface in a material-detaching or material-removing treatment so that the protruding metal of the surface forms raised microstructures (), in particular projections, ridges, protuberances or bumps, these microstructures being reworked in at least a second process step by shaping and/or breaking so that a significant proportion of the structures form undercuts () in relation to the surface.

Surface conditioning for thermal spray layers

The invention relates to a method of contactlessly ascertaining chatter marks in finely-machined workpiece surfaces, with the following steps: a contactlessly operating, high-resolution surface-measuring method is used to generate from the workpiece surface a data record representing the actual microtopography of the workpiece surface, to take away from this a data record representing the idealized macroform of the workpiece surface, and in this way to generate a data record representing the flat-extended form of the microtopography of the workpiece surface. This data record is subjected to a digital in-phase bandpass filtering with respect to its circumferential waviness, the waviness of interest here of the chatter marks preferably being allowed through. The data record formed in this way is for its part subjected to a stationary multiple cross correlation with respect to the transverse direction. This produces an only two-dimensional data record representing the circumferential position of any chatter marks on the workpiece surface and their degree. To form a characteristic assessment number for chatter marks, the chatter-mark data record can be further evaluated, for example by two-stage averaging.

Method of qualitatively ascertaining the position and degree of severity of chatter marks in a fine-machined surface of a workpiece

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Waldenbuch, Germany

Tobias Hercke