Hard Broaching - inspire

chipping from the tool. This cicle is repeated up tp the
moment that the tool achieves the end position.
Figure 3: Simulation of the hard broaching tool
Figure 5: Influence of the feed-per-stroke on the cutting
force (u.) and cutting perpendicular force (l.)
Status
This project number CTI 8967.1, supported by the Swiss
Confederation’s innovation promotion agency (CTI) is
closed at 2009.
Figure 4: Evaluation of the available chip space
During hard broaching experiments was detected a strong
influence of the feed-per-stroke over the cutting force and
the cutting perpendicular force. Probably is the increase of
the forces caused by the blockage of the chip space on the
abrasive layer. A new experimental series will be carried
out to correlate the increase of the forces with the blockage
of the chip space.
The correlation between forces, chip space and maximal
admissible load on the grains build together the basis for
the force-controlled process strategy. Thereby the tool
should moves continuously into the work piece until the
specified force limit is achieved, so that no damage of the
abrasive layer happens. As soon as this force limit is
achieved a retreat of the tool should follow to clean the
Projektpartner
Fässler AG – www.faessler-ag-ch
Breu Diamantwerkzeug GmbH – www.breu-diawz.ch
Kontakt
Kuster Fredy
IWF Institute of Machine Tools and Manufacturing
ETH Zurich
Tannenstrasse 3, CLA G17.1
8092 Zurich Switzerland
Tel +41 1 632 24 24
Fax +41 1 632 11 25
e-mail kuster@iwf.mavt.ethz.ch
August 2009