Patent US4839175A successfully refreshed from Google Patents.
Patent US3819916A successfully refreshed from Google Patents.
US3819916A
Expired / Lapsed
US
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Method for monitoring machining condition of a machine tool
Assignee: Okuma Corp
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Filing: 1972-10-20
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Granted: 1974-06-25
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Expires: 1992-10-20
Abstract
Abstract In a machine tool having a work holder and a cutting tool which is brought into cutting engagement with a workpiece held on the work holder to machine the same, the reaction force on the cutting tool is detected in the form of three components, that is, a backing force component, a feeding force component and a main force component, to obtain ratios of one component to the other two components. The ratios are then compared with corresponding reference values to detect abnormal conditions of the cutting tool.
Inventors
- 👤 T Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:15
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/406; G05B19/4065; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37343
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A method of monitoring machining condition of a machining tool having a work holder for holding a workpiece and a cutting tool which is adapted to be brought into cutting engagement with said workpiece, said method comprising steps of measuring a backing force component, a feeding force component and a main force component acting on the cutting tool, calculating ratios of two force components to the other force component, and comparing the ratios with corresponding reference values to detect abnormal conditions during cutting operation.
Claim 2
Independent Claim
84 words
A method of monitoring machining condition of a machining tool having a work holder for holding a workpiece and a cutting tool which is adapted to be brought into cutting engagement with said workpiece, said method comprising steps of measuring a backing force component, a feeding force component and a main force component acting on the cutting tool, calculating ratios of two force components to the other force component, and comparing the ratios with corresponding reference values to detect abnormal conditions during cutting operation.
Claim 3
Dependent Claim
20 words
A method in accordance with claim 1 in which said reference values are fixed values determined by reference circuit means.
Claim 4
Dependent Claim
28 words
A method in accordance with claim 1 in which the ratios of the backing force component and the feeding force component to the main force component are calculated.
Claim 5
Dependent Claim
29 words
A method in accordance with claim 1 in which the operation of the machine tool is stopped when at least one of the ratio exceeds the corresponding reference value.
Claim 6
Dependent Claim
31 words
A method in accordance with claim 1 in which when at least one of the force components exceeds the maximum allowable value, the operation of the machine tool is automatically stopped.
References Cited (Backward Citations)
US3326039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |