Modular integration of sensor based milling process monitoring and control functions to a proposed CNC system architecture is presented. Each sensor based process control algorithm resides in a dedicated processor in the AT bus with a modular software. The CNC system’s motion control module has been designed to accomodate rapid manipulation of feeds, cutting conditions and NC tool path which may be demanded by machining process control modules in real time. Modular integration of adaptive control of cutting forces, tool condition monitoring, chatter detection and suppression tasks are illustrated as examples. The process control and monitoring modules are serviced in the real-time multi-tasking environment within one millisecond time intervals without disturbing the position control system. The paper present constraints and guidelines in designing CNC systems which allow modular integration of user developed real time machining process control and monitoring applications.

Issue Section:
Research Papers
Topics:
Computer numerical control machine tools, Design, Machining, Milling, Process monitoring, Sensors, Process control, Cutting, Adaptive control, Algorithms, Chatter, Computer software, Condition monitoring, Motion control, Position control
1.
Altintas
Y.
,
Newell
N.
,
Ito
M.
,
1996
, “
Modular CNC Design for Intelligent Machining, Part I: Design of a Hierarchical Motion Control Module for CNC Machine Tools
,”
ASME JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING
, Vol.
118
, No.
4
, November, pp.
506
–
513
.
2.
Altintas, Y., 1994, “Sensor Assisted Intelligent Pocketing,” TSI Press Series, Proceedings of the First World Automation Congress (WAC94), ISRAM, Vol. 1, pp. 425–432.
3.
Tlusty
J.
, and
Smith
S.
,
1992
, “
Stabilizing Chatter by Automatic Spindle Speed Regulation
,”
Annals of the CIRP
, Vol.
41
, No.
1
, pp.
433
–
436
.
4.
Stein
J. L.
,
Colvin
D.
,
Clever
G.
, and
Wang
C. H.
,
1986
, “
Evaluation of DC Servo Machine Tool Feed Drives as Force Sensors
,”
ASME Journal of Dynamic Systems, Measurement, and Control
, Vol.
108
, pp.
279
–
288
.
5.
Altintas
Y.
,
1992
, “
Prediction of Cutting Forces and Tool Breakage in Milling from Feed Drive Current Measurements
,”
ASME Journal of Engineering for Industry
, Vol.
114
, pp.
386
–
392
.
6.
Moriwaki
T.
,
1980
, “
Detection for Cutting Tool Fracture by Acoustic Emmission Measurement
,”
Annals of the CIRP
, Vol.
29
, No.
1
, pp.
35
–
40
.
7.
Dornfeld, D. A., and Lan, M. S., 1983, “Chip Form Detection Using Acoustic Emission,” Proceedings of the 11th North American Manufacturing Research Conference, Vol. 11, pp. 386–389.
8.
Dornfeld, D. A., 1991, Research Reports 90/91—Laboratory for Manufacturing Automation, University of California-Berkeley.
9.
Spence
A.
, and
Altintas
Y.
, “
CAD Assisted Adaptive Control of the Milling Process
,”
ASME Journal of Dynamic Systems, Measurement, and Control
, Vol.
113
, pp.
444
–
450
.
10.
Ulsoy
A. G.
,
Koren
Y.
, and
Rasmussen
F.
,
1983
, “
Principal Developments in the Adaptive Control of Machine Tools
,”
ASME Journal of Dynamic Systems, Measurement, and Control
, Vol.
105
, pp.
107
–
112
.
11.
Altintas
Y.
, and
Munasinghe
W. K.
,
1994
, “
A Hierachical Open Architecture CNC System for Machine Tools
,”
Annals of the CIRP
, Vol.
43
, No.
1
, pp.
349
–
354
.
12.
Ma
C. C. H.
, and
Altintas
Y.
,
1990
, “
Direct Adaptive Cutting Force Control of Milling Processes
,”
Automatica
, Vol.
26
, No.
5
, pp.
899
–
902
.
13.
Clarke
D. W.
,
Mohtadi
C.
, and
Tuffs
P. S.
,
1987
, “
Generalized Predictive Control—Part I. The Basic Algorithm
,”
Automatica
, Vol.
23
, No.
2
, pp.
137
–
148
.
14.
Altintas
Y.
,
1988
, “
In Process Detection of Tool Breakages using Time Series Monitoring of Cutting Forces
,”
International Journal of Machine Tools Manufacturing
, Vol.
28
, No.
2
, pp.
157
–
172
.
15.
Iserman
R.
,
1982
, “
Parameter Adaptive Control Algorithms—A Tutorial
,”
Automatica
, Vol.
18
, No.
5
, pp.
513
–
528
.
16.
Altintas
Y.
, and
Chan
P.
,
1992
, “
In-Process Detection and Supression of Chatter in Milling
,”
International Journal of Machine Tools Manufacturing
, Vol.
32
, pp.
329
–
347
.
17.
Lin, S. C., DeVor, R. E., and Kapoor, S. G., 1988, The Effects of Variable Speed Cutting on Vibration Control in Face Milling, PED-33, pp. 41–51.
18.
Week
M.
,
Verhagg
E.
, and
Gather
M.
,
1975
, “
Adaptive Control of Face Milling Operations with Strategies for Avoiding Chatter-Vibrations and for Automatic Cut Distribution
,”
Annals of the CIRP
, Vol.
24
, No.
1
, pp.
405
–
409
.
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