US4332161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic detection of tool wear and fracture
Assignee: NL CIRCUIT DESIGN BLOCK Co Ltd A CORP OF JAPAN
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Filing: 1980-01-29
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Granted: 1982-06-01
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Expires: 2000-01-29
Abstract
Abstract For detecting brittle fracture and wear of a tip of a cutting tool an acoustic emission monitoring system has a converter for converting acoustic emission into an electric signal, a filter for rejecting frequency components in the signal below a frequency between 50 kHz and 300 kHz, a detector to detect the amplitude of the signal after the rejection of those frequency components, and a comparator for comparing that amplitude to a predetermined reference amplitude.
Inventors
- 👤 Yoshiaki Kakino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:09
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/58; B; B23; B23Q; B23Q17/00; B23Q17/09; B23Q17/0952; B23Q17/0957; B23Q17/098; G01N29/00; G01N29/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
An acoustic emission monitoring system, for detecting brittle fracture and wear of a tip of a cutting tool, comprising means for converting acoustic emission into an electric signal, a high-pass filter for rejecting frequency components in said signal lower than a frequency selected in the range 50 KHz to 300 KHz inclusive, means for detecting the amplitude of said signal after rejecting said frequency components, and means for comparing said amplitude with a predetermined reference amplitude.
Claim 2
Dependent Claim
76 words
An acoustic emission monitoring system, for detecting brittle fracture and wear of a tip of a cutting tool, comprising means for converting acoustic emission into an electric signal, a high-pass filter for rejecting frequency components in said signal lower than a frequency selected in the range 50 KHz to 300 KHz inclusive, means for detecting the amplitude of said signal after rejecting said frequency components, and means for comparing said amplitude with a predetermined reference amplitude.
Claim 3
Independent Claim
67 words
A method of detecting brittle fracture and wear of a tip of a cutting tool comprising the steps of converting acoustic emission into an electric signal, rejecting frequency components in said signal lower than a frequency selected in the range 50 KHz to 300 KHz inclusive, detecting the amplitude of said signal after rejection of said frequency components, and comparing said amplitude with a predetermined reference amplitude.
Claim 4
Independent Claim
67 words
A method of detecting brittle fracture and wear of a tip of a cutting tool comprising the steps of converting acoustic emission into an electric signal, rejecting frequency components in said signal lower than a frequency selected in the range 50 KHz to 300 KHz inclusive, detecting the amplitude of said signal after rejection of said frequency components, and comparing said amplitude with a predetermined reference amplitude.
Claim 5
Dependent Claim
28 words
The method claimed in claim 2 comprising the further step of integrating said amplitude for a predetermined period to evaluate the wear of said tip of said tool.
Claim 6
Dependent Claim
88 words
An acoustic emission monitoring system, for detecting brittle fracture and wear of a tip of a cutting tool, comprising: (i) means for converting acoustic emission into an electric signal; (ii) a high-pass filter for rejecting frequency components in said signal lower than a frequency selected in the range 50 kHz to 300 kHz inclusive, (iii) means for detecting the amplitude of said signal after rejecting said frequency components, (iv) means for integrating the detected amplitude, and (v) means for comparing the integrated amplitude with a predetermined reference amplitude.
Claim 7
Dependent Claim
88 words
An acoustic emission monitoring system, for detecting brittle fracture and wear of a tip of a cutting tool, comprising: (i) means for converting acoustic emission into an electric signal; (ii) a high-pass filter for rejecting frequency components in said signal lower than a frequency selected in the range 50 kHz to 300 kHz inclusive, (iii) means for detecting the amplitude of said signal after rejecting said frequency components, (iv) means for integrating the detected amplitude, and (v) means for comparing the integrated amplitude with a predetermined reference amplitude.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |