Cold Micro Metal Forming by Frank Vollertsen & Sybille Friedrich & Bernd Kuhfuß & Peter Maaß & Claus Thomy & Hans-Werner Zoch

Author:Frank Vollertsen & Sybille Friedrich & Bernd Kuhfuß & Peter Maaß & Claus Thomy & Hans-Werner Zoch
Language: eng
Format: epub
ISBN: 9783030112806
Publisher: Springer International Publishing

The interactions between overlapping removal paths are complex and partly unknown.

The relationship between the process input parameters (actuating variables U) and the shape parameters of one removal (control variables A) are non-linear and can cover a broad range.

Cross-Path Interactions:

Due to the effective thermal energy distribution, the removal cross-section of the processed geometry is assumed as a superposition of single Gaussian curves. However, the angle-dependent laser energy absorption as well as the thermal and hydrodynamic condition can lead to a reduced removal rate at a sloped surface (flank), compared to a flat surface. Hence, a cavity produced by a simple overlapping of single paths does not necessarily meet the predicted geometry. Figure 4.27 shows a measured cavity cross-section (black curve) of two overlapping removal paths produced by identical process parameters with a center position distance xd of 50 µm [Zha15]. The cavity cross-sections produced are measured by a confocal scanning microscope and show a distinctive deviation from the removal cross-section predicted by a process chain simulation with overlapping removal paths.

Fig. 4.27Angle-dependent flank effect: Measured cross-section (black) and superposition (gray) of the Gaussian approximated removal paths with a distance xd of 50 and 70 µm as well as the simulated prediction without consideration of the flank angle (dashed)

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