US3562477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine tools
Assignee: NAT RES DEV
•
Filing: 1969-01-17
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Granted: 1971-02-09
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Expires: 1989-01-17
Abstract
Abstract A method of controlling and reducing the amplitude of vibration of a machine tool during machining of a workpiece comprises measuring the frequency of vibration of a machine tool during use of the machine tool, producing pulses of electrical current at the frequency of the vibration, and applying the pulses of current to the cutting zone, in a predetermined phase relationship to the tool vibration, so as to heat the cutting zone, thereby reducing or at least limiting the amplitude of vibration.
Inventors
- 👤 Bernard Ronald Macmanus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:36
CPC Classifications
B; B23; B23Q; B23Q11/00; B23Q11/0032; Y; Y10; Y10T; Y10T82/00; Y10T82/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A method of controlling and reducing the amplitude of vibration of a machine tool during machining of a workpiece comprising measuring the frequency of vibration of a machine tool during use of the machine tool, producing pulses of electrical current at the frequency of the vibration, and applying the pulses of current to the cutting zone, in a predetermined phase relationship to the tool vibration, so as to heat the cutting zone, thereby reducing or at least limiting the amplitude of vibration.
Claim 2
Independent Claim
82 words
A method of controlling and reducing the amplitude of vibration of a machine tool during machining of a workpiece comprising measuring the frequency of vibration of a machine tool during use of the machine tool, producing pulses of electrical current at the frequency of the vibration, and applying the pulses of current to the cutting zone, in a predetermined phase relationship to the tool vibration, so as to heat the cutting zone, thereby reducing or at least limiting the amplitude of vibration.
Claim 3
Dependent Claim
20 words
A method according to claim 1 and in which the frequency of vibration is obtained by measuring dynamic tool displacement.
Claim 4
Dependent Claim
20 words
A method according to claim 1 and in which the frequency of vibration is obtained by measuring dynamic cutting forces.
Claim 5
Dependent Claim
36 words
A method according to claim 1 including the steps of adjusting the phase relationship between the heating pulses in the tool vibration and then increasing the system gain until stabilization is obtained with virtually zero current.
Claim 6
Independent Claim
83 words
An apparatus for controlling and reducing the amplitude of vibration of a machine tool during machining of a workpiece, the apparatus including a transducer adapted to produce a signal indicative of the frequency of vibration of the tool, means to produce a series of pulses of electrical current which are in a predetermined phase relationship to the vibration, and means to apply the current across the tool/workpiece area to heat this area and thus to reduce the amplitude of vibration of the tool.
Claim 7
Independent Claim
83 words
An apparatus for controlling and reducing the amplitude of vibration of a machine tool during machining of a workpiece, the apparatus including a transducer adapted to produce a signal indicative of the frequency of vibration of the tool, means to produce a series of pulses of electrical current which are in a predetermined phase relationship to the vibration, and means to apply the current across the tool/workpiece area to heat this area and thus to reduce the amplitude of vibration of the tool.
Claim 8
Dependent Claim
30 words
Apparatus according to claim 5 including a phase correction circuit, so that the phase of the heating current pulses can be altered relatively to the phase of the tool vibration.
Claim 9
Dependent Claim
38 words
Apparatus according to claim 5 and including means for converting the transducer signal to a series of pulses preferably by half wave rectification and a power amplifier to amplify the pulses so as to provide sufficient heating current.
Claim 10
Dependent Claim
31 words
Apparatus according to claim 5 and including means to vary the gain of the system, the gain being defined as the electrical current in amps divided by the amplitude of vibration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |