On-Line Geometrical Identification of Reconfigurable Machine Tool using Virtual Machining
One of the main research directions in CAD/CAM
machining area is the reducing of machining time.
The feedrate scheduling is one of the advanced techniques that
allows keeping constant the uncut chip area and as sequel to keep
constant the main cutting force. They are two main ways for feedrate
optimization. The first consists in the cutting force monitoring, which
presumes to use complex equipment for the force measurement and
after this, to set the feedrate regarding the cutting force variation. The
second way is to optimize the feedrate by keeping constant the
material removal rate regarding the cutting conditions.
In this paper there is proposed a new approach using an extended
database that replaces the system model.
The feedrate scheduling is determined based on the identification
of the reconfigurable machine tool, and the feed value determination
regarding the uncut chip section area, the contact length between tool
and blank and also regarding the geometrical roughness.
The first stage consists in the blank and tool monitoring for the
determination of actual profiles. The next stage is the determination
of programmed tool path that allows obtaining the piece target
profile.
The graphic representation environment models the tool and blank
regions and, after this, the tool model is positioned regarding the
blank model according to the programmed tool path. For each of
these positions the geometrical roughness value, the uncut chip area
and the contact length between tool and blank are calculated. Each of
these parameters are compared with the admissible values and
according to the result the feed value is established.
We can consider that this approach has the following advantages:
in case of complex cutting processes the prediction of cutting force is
possible; there is considered the real cutting profile which has
deviations from the theoretical profile; the blank-tool contact length
limitation is possible; it is possible to correct the programmed tool
path so that the target profile can be obtained.
Applying this method, there are obtained data sets which allow the
feedrate scheduling so that the uncut chip area is constant and, as a
result, the cutting force is constant, which allows to use more
efficiently the machine tool and to obtain the reduction of machining
time.
[1] B. K. Fussell, R. B. Jerard, J. G. Hemmett, Robust Feedrate Selection for
3-Axis NC Machining Using Discrete Models in Journal of
Manufacturing Science and Engineering, vol. 123, May 2001, pp.
214-224;
[2] R. G. Landers, A. G. Ulsoy, Model-Based Machining Force Control, in
Journal of Dynamic Systems, Mesurement and Control, vol. 122,
September 2000, pp. 521-527;
[3] H. U. Lee, D. W. Cho, An intelligent feedrate scheduling based on
virtual machining, in International Journal of Advanced Manufacturing
Technologies, July 2003, pp. 873-882;
[4] M. Dima, Contributions at Cutting Scheme Modeling at Rolling Axodes
Associated Surfaces Generation, doctoral thesis, "Dunarea de Jos"
University of Galati, Romania, 2006;
[5] N. Oancea, M. Dima, V. Teodor, Similitudes Between the Methods used
to Study Enveloping Surfaces. I. The Profiles Associated to Rolling
Centroids, in: The Annals of "Dunarea de Jos" University of Galati,
Fasc. V, year XIX, ISSN 1221-4566, 2001, pp. 40-45;
[6] M. Dima, N. Oancea, Constructive modifications for the energetically
improvement of the tooting process, in: Romanian Journal of Technical
Sciences Applied Mechanics, Tome 49, special number 2004,
Proceedings of the International Conferences on Manufacturing Systems
ICMaS 2004, ISBN 973-27-1102-7, pp. 237-241;
[7] L. K. Daneshmend, H. A. Pak, Model Reference Adaptive Control of
Feed Force in Turning, in: ASME J. Dyn. Syst., Meas., Control, 108,
No. 3, pp. 215-222;
[8] K. K. Wang, Solid Modeling for Optimization Metal Removal of Three-
Dimensional NC End Milling, in: J. Manuf. Syst., 7, No. 1, 1988, pp. 57-
65.
[1] B. K. Fussell, R. B. Jerard, J. G. Hemmett, Robust Feedrate Selection for
3-Axis NC Machining Using Discrete Models in Journal of
Manufacturing Science and Engineering, vol. 123, May 2001, pp.
214-224;
[2] R. G. Landers, A. G. Ulsoy, Model-Based Machining Force Control, in
Journal of Dynamic Systems, Mesurement and Control, vol. 122,
September 2000, pp. 521-527;
[3] H. U. Lee, D. W. Cho, An intelligent feedrate scheduling based on
virtual machining, in International Journal of Advanced Manufacturing
Technologies, July 2003, pp. 873-882;
[4] M. Dima, Contributions at Cutting Scheme Modeling at Rolling Axodes
Associated Surfaces Generation, doctoral thesis, "Dunarea de Jos"
University of Galati, Romania, 2006;
[5] N. Oancea, M. Dima, V. Teodor, Similitudes Between the Methods used
to Study Enveloping Surfaces. I. The Profiles Associated to Rolling
Centroids, in: The Annals of "Dunarea de Jos" University of Galati,
Fasc. V, year XIX, ISSN 1221-4566, 2001, pp. 40-45;
[6] M. Dima, N. Oancea, Constructive modifications for the energetically
improvement of the tooting process, in: Romanian Journal of Technical
Sciences Applied Mechanics, Tome 49, special number 2004,
Proceedings of the International Conferences on Manufacturing Systems
ICMaS 2004, ISBN 973-27-1102-7, pp. 237-241;
[7] L. K. Daneshmend, H. A. Pak, Model Reference Adaptive Control of
Feed Force in Turning, in: ASME J. Dyn. Syst., Meas., Control, 108,
No. 3, pp. 215-222;
[8] K. K. Wang, Solid Modeling for Optimization Metal Removal of Three-
Dimensional NC End Milling, in: J. Manuf. Syst., 7, No. 1, 1988, pp. 57-
65.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:55938", author = "Alexandru Epureanu and Virgil Teodor", title = "On-Line Geometrical Identification of Reconfigurable Machine Tool using Virtual Machining", abstract = "One of the main research directions in CAD/CAM
machining area is the reducing of machining time.
The feedrate scheduling is one of the advanced techniques that
allows keeping constant the uncut chip area and as sequel to keep
constant the main cutting force. They are two main ways for feedrate
optimization. The first consists in the cutting force monitoring, which
presumes to use complex equipment for the force measurement and
after this, to set the feedrate regarding the cutting force variation. The
second way is to optimize the feedrate by keeping constant the
material removal rate regarding the cutting conditions.
In this paper there is proposed a new approach using an extended
database that replaces the system model.
The feedrate scheduling is determined based on the identification
of the reconfigurable machine tool, and the feed value determination
regarding the uncut chip section area, the contact length between tool
and blank and also regarding the geometrical roughness.
The first stage consists in the blank and tool monitoring for the
determination of actual profiles. The next stage is the determination
of programmed tool path that allows obtaining the piece target
profile.
The graphic representation environment models the tool and blank
regions and, after this, the tool model is positioned regarding the
blank model according to the programmed tool path. For each of
these positions the geometrical roughness value, the uncut chip area
and the contact length between tool and blank are calculated. Each of
these parameters are compared with the admissible values and
according to the result the feed value is established.
We can consider that this approach has the following advantages:
in case of complex cutting processes the prediction of cutting force is
possible; there is considered the real cutting profile which has
deviations from the theoretical profile; the blank-tool contact length
limitation is possible; it is possible to correct the programmed tool
path so that the target profile can be obtained.
Applying this method, there are obtained data sets which allow the
feedrate scheduling so that the uncut chip area is constant and, as a
result, the cutting force is constant, which allows to use more
efficiently the machine tool and to obtain the reduction of machining
time.", keywords = "Reconfigurable machine tool, system identification,
uncut chip area, cutting conditions scheduling.", volume = "2", number = "3", pages = "309-5", }