Device and method for recommending dynamically preferred speeds for machining
First Claim
1. A device which independent of machine tool parameters provides rotational speed recommendations for relative rotation between a cutting tool having at least one cutting edge and a workpiece whereby such speeds are likely to result in the reduction or elimination of chatter comprising:
- (a) a transducer for sensing vibrations including the chatter between the cutting tool and workpiece and providing an electronic signal corresponding thereto;
(b) means for conditioning the signal to optimize the amplitude and attenuate unwanted frequency components;
(c) means for processing the conditioned signal to determine the frequency of the dominant spectral component;
(d) means for inputting the number of cutting edges on the cutting tool;
(e) computing means to calculate rotational speed recommendations as a function of the frequency of the dominant spectral component and the number of cutting edges; and
(f) means for displaying the rotational speed recommendations.
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Accused Products
Abstract
A hand-held, portable device recommends dynamically preferred speeds for stabilizing or reducing undesirable vibration such as chatter in a machining process. The device may be applied to machining processes such as turning, boring, milling and drilling which exhibit a relative rotational motion between the cutting tool and workpiece. The device measures in a safe, non-contact manner via a microphone the dominant audio signal component of the sound pressure emanating from the machining processes. Without prior knowledge of the machining process parameters or the dynamic characteristics of the machine tool or workpiece, the audio signal is conditioned and processed to determine the frequency component levels. The rotational speeds which are more likely to lead to a stable machining process are calculated based on the number of teeth on the cutting tool and the identified dominant frequency of vibration. The dynamically preferred speeds are displayed as recommendations to the process operator or machinist.
77 Citations
25 Claims
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1. A device which independent of machine tool parameters provides rotational speed recommendations for relative rotation between a cutting tool having at least one cutting edge and a workpiece whereby such speeds are likely to result in the reduction or elimination of chatter comprising:
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(a) a transducer for sensing vibrations including the chatter between the cutting tool and workpiece and providing an electronic signal corresponding thereto; (b) means for conditioning the signal to optimize the amplitude and attenuate unwanted frequency components; (c) means for processing the conditioned signal to determine the frequency of the dominant spectral component; (d) means for inputting the number of cutting edges on the cutting tool; (e) computing means to calculate rotational speed recommendations as a function of the frequency of the dominant spectral component and the number of cutting edges; and (f) means for displaying the rotational speed recommendations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for determining rotational speed recommendations for relative rotation between a cutting tool having at least one cutting edge and a workpiece whereby such speeds are likely to result in the reduction or elimination of chatter and whereby such speeds are determined independent of machine tool parameters comprising the steps of:
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(a) sensing vibrations including the chatter between the cutting tool and workpiece and providing an electronic signal corresponding thereto; (b) conditioning the signal to optimize the amplitude and attenuate unwanted frequency components; (c) processing the conditioned signal to determine the frequency of the dominant spectral component; (d) inputting the number of cutting edges on the cutting tool; (e) calculating rotational speed recommendations as a function of the frequency of the dominant spectral component and the number of cutting edges; and (f) displaying the rotational speed recommendations. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification