Prediction of Feed-Rate Slowdowns in Precise Micromilling Processes

Meijer, A.1, a; Krebs, E.1, b; Wiederkehr, P.2, c; Biermann, D.1, d

1)
Institut für Spanende Fertigung, Technische Universität Dortmund, Baroper Str. 303, 44227 Dortmund
2)
Lehrstuhl 14 Software Engineering – Virtual Machining, Technische Universität Dortmund, Otto-Hahn-Straße 12, 44227 Dortmund

a) meijer@isf.de; b) krebs@isf.de; c) petra.wiederkehr@tu-dortmund.de; d) biermann@isf.de

Kurzfassung

In a production of filigree and complex geometries, different NC-controlled processes such as laser cutting, EDM milling, and micromachining require a constant feed rate to ensure high-quality manufacturing results. Due to the technically limited acceleration ability of the machine tool axes, the nominal feed cannot always be achieved. This in particular is the case when the machine tool has to perform a significant change of direction in corners. In this paper, the impact of too low feed rates on the process of precise micromilling of a hardened high-speed steel AISI (M3:2) 63 ± 1 HRC) is discussed. An unattained feed rate leads to a ploughing dominated process with a high burr formation resulting in a huge potential loss of micromilling processes. Furthermore, a simulation approach is presented which allows the prediction of the actually achieved feed rate. The developed machine model provides a reliable method to identify critical areas in the entire NC program.

Schlüsselwörter

hard machining, micromilling, ploughing, feed-rate analysis

Veröffentlichung

Journal of Manufacturing and Materials Processing, 2 (2018) 1, doi: 10.3390/jmmp2010019