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Research Papers

High Frequency Correction of Dynamometer for Cutting Force Observation in Milling

[+] Author and Article Information
François Girardin1

 Université de Lyon, CNRS INSA-Lyon, LaMCoS UMR5259, F-69621, Francefrancois.girardin@insa-lyon.fr

Didier Remond, Jean-François Rigal

 Université de Lyon, CNRS INSA-Lyon, LaMCoS UMR5259, F-69621, France

1

Corresponding author.

J. Manuf. Sci. Eng 132(3), 031002 (Apr 28, 2010) (8 pages) doi:10.1115/1.4001538 History: Received April 10, 2009; Revised March 19, 2010; Online April 28, 2010; Published June 16, 2010

Piezoelectric dynamometers are widely used for cutting force measurements. Indeed, this device has the largest bandwidth for this kind of measurement. Nevertheless, the behavior of this device is not very well-known and its use is sometimes inappropriate for static and high frequency dynamic measurements. In this paper, a piezoelectric dynamometer is used for cutting force measurements in a milling case. Cutting forces in milling are discontinuous by nature due to successive inward and outward movements of tool-teeth on the workpiece. As a result, a bandwidth criterion based on cutting parameters is defined in order to permit clear observation of the mean oscillation of the cutting force. The frequency response of a dynamometer is then analyzed over a wide frequency range. A 2 kHz bandwidth can be defined for an efficient correction of cutting force. The dynamometer appears to be exploitable for higher frequencies up to at least 16 kHz though a large number of factors must be taken into account in the analysis. Finally, several lateral milling tests are performed by changing cutting speed, feed rate, and lubricant conditions. The correction of measurements permits highlighting certain particularities in the cutting force signals, such as the effect of shock of inward tool-teeth strokes on the workpiece, the specific behavior for outward tool-teeth strokes, and the effect of a lubricant on the variation in cutting forces.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Experimental set-up

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Figure 3

Construction of cutting depth model

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Figure 4

Theoretical and experimental cutting forces for Vc=160 m/min

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Figure 5

Frequency spectrum for the cutting force model

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Figure 6

Sufficient bandwidth for frequency analysis

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Figure 7

Bandwidth validation—case of the cutting parameter of Table 2

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Figure 8

Theory of correction in frequency domain

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Figure 9

Experimental arrangement

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Figure 10

Transfer and coherence functions for a solicitation along x axis

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Figure 11

Coherence for each axes solicitation

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Figure 12

Time representation of applied, measured and corrected signals for solicitation effort

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Figure 13

Effect of correction on the cutting force-cutting parameters of Table 2

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Figure 14

Corrected efforts for two feed rates and two cutting speeds

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Figure 15

Corrected efforts for fz=0.1 mm/tooth and two cutting speeds

Tables

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