US3744353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for preventing regenerative chatter in a machine tool, particularly in a lathe
Assignee: Individual
•
Filing: 1971-08-13
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Granted: 1973-07-10
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Expires: 1991-08-13
Abstract
Abstract The invention relates to a method for suppressing regenerative chatter of the kind which occurs during the machining of workpieces by a tool of a machine tool, said method consisting of changing repeatedly the cutting speed of the tool whilst the latter machines the same surface of the workpiece, thereby making the frequency with which the waves or ripples on the surface which is being machined impact on the tool dissimilar to the inherent frequency of the mass system on which the cutting force acts, so that these waves or ripples when impacting on the tool do not increase the amplitude of the vibrations which product chattering. Moreover the invention relates to a machine tool for carrying out such method, more particularly to a lathe.
Inventors
- 👤 H Rohs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:41
CPC Classifications
B; B23; B23Q; B23Q17/00; B23Q17/09; B23Q17/0952; B23Q17/0971; B23Q17/0976; B23Q15/00; B23Q15/007; B23Q15/12; Y; Y10; Y10S; Y10S82/00; Y10S82/904; Y10T; Y10T82/00; Y10T82/25; Y10T82/2502; Y10T82/2552; Y10T82/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
A machine tool comprising a tool support, a work support, means for mounting said support for relative rotation causing the tool to repeatedly machine the same surface of the workpiece on successive relative revolutions with a cutting speed depending on the velocity of said relative rotation, said workpiece, said tool and said supports thereof constituting a vibratory mass system in which said tool and said workpiece are capable of relative vibration at an inherent frequency causing said tool to produce ripples on said surface, of the work-piece, driving means for producing said relative rotation of said tool and said workpiece and control means connected with said driving means for repeatedly changing said velocity of rotation produced by said driving means, while said tool repeatedly machines said surface of the workpiece thereby making tHe frequency with which said ripples of said surface impact on said tool dissimilar to said inherent frequency so that said ripples when impacting on said tool do not increase the amplitude of said vibration.
Claim 2
Dependent Claim
167 words
A machine tool comprising a tool support, a work support, means for mounting said support for relative rotation causing the tool to repeatedly machine the same surface of the workpiece on successive relative revolutions with a cutting speed depending on the velocity of said relative rotation, said workpiece, said tool and said supports thereof constituting a vibratory mass system in which said tool and said workpiece are capable of relative vibration at an inherent frequency causing said tool to produce ripples on said surface, of the work-piece, driving means for producing said relative rotation of said tool and said workpiece and control means connected with said driving means for repeatedly changing said velocity of rotation produced by said driving means, while said tool repeatedly machines said surface of the workpiece thereby making tHe frequency with which said ripples of said surface impact on said tool dissimilar to said inherent frequency so that said ripples when impacting on said tool do not increase the amplitude of said vibration.
Claim 3
Dependent Claim
39 words
A machine tool as claimed in claim 1 further comprising a programmer connected with said control means for monitoring to said control means the magnitude, timing and direction of the repeated changes of the velocity of said driving means.
Claim 4
Dependent Claim
37 words
A machine tool as claimed in claim 1 further comprising sensing means connected with said vibratory mass system to sense the vibration thereof, said sensing means being connected with said control means to influence the operation thereof.
Claim 5
Dependent Claim
19 words
A machine tool as claimed in claim 3 in which said sensing means is mounted on said tool support.
Claim 6
Dependent Claim
45 words
A machine tool as claimed in claim 3 in which said sensing means is provided with means for rendering said control means operative, when the vibrations exceed a certain level and for rendering said control means inoperative, when said vibrations decrease below a certain level.
Claim 7
Dependent Claim
31 words
A machine tool as claimed in claim 3 in which said sensing means is connected with said programmer for influencing the operation thereof in dependence on the intensity of said vibrations.
Claim 8
Dependent Claim
21 words
A machine tool as claimed in claim 1 constituting a lathe, said work support being the work spindle of said lathe.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |