US3851550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive control system for program-operated machine tools
Assignee: DMG Mori AG
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Filing: 1972-09-07
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Granted: 1974-12-03
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Expires: 1992-09-07
Abstract
Abstract An adaptive control system for machine tools wherein a spindle rotates a workpiece and the latter is treated by a tool which is movable in parallelism with and at right angles to the work spindle by discrete variable-speed motors. The control system employs two regulating devices which are connected with the motors by way of a coordinate converter circuit and receive adjusting signals from a torque measuring device for the work spindle, from an RPM measuring device for the work spindle, and from a command unit which can store information pertaining to desired final contour of the workpiece and to desired output. The regulating devices compare the actual output with the desired output and the momentary contour of the workpiece with the desired final contour, and adjust the respective motors so that the geometric sum of movements of the tool in both directions remains constant and that the ratio of movements of the tool in first and second directions is proportional to deviations of the signal indicating the actual output from the signal indicating the desired output.
Inventors
- 👤 E Schalles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:25
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B19/4163; Y; Y10; Y10T; Y10T82/00; Y10T82/25; Y10T82/2502; Y10T82/2531; Y10T82/2533; Y10T82/2535
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
208 words
In a machine tool for turning a rotating workpiece by a material removing tool which is movable in first and second directions at rates determined by first and second variable-speed motors, an adaptive control system comprising first and second adjustable regulating devices each operatively connected with a different one of said motors, said devices having characteristic curves one of which is phase-shifted relative to and trails the other curve by 90*; first and second measuring means for furnishing to said regulating devices a first signal indicative of the torque applied to and the RPM of the workpiece and thus representing the actual output of the machine tool; and a command unit for furnishing to said regulating devices second and third adjusting signals respectively indicating the desired output and the desired final contour of the workpiece, said regulating devices being arranged to regulate the speed of said motors in response to said signals so that the geometric sum of movements of said tool in said first and second directions is constant and that the ratio of movements of said tool in said first and second directions, and hence the direction of actual movement of said tool, is proportional to the deviation of said first signal from said second signal.
Claim 2
Dependent Claim
208 words
In a machine tool for turning a rotating workpiece by a material removing tool which is movable in first and second directions at rates determined by first and second variable-speed motors, an adaptive control system comprising first and second adjustable regulating devices each operatively connected with a different one of said motors, said devices having characteristic curves one of which is phase-shifted relative to and trails the other curve by 90*; first and second measuring means for furnishing to said regulating devices a first signal indicative of the torque applied to and the RPM of the workpiece and thus representing the actual output of the machine tool; and a command unit for furnishing to said regulating devices second and third adjusting signals respectively indicating the desired output and the desired final contour of the workpiece, said regulating devices being arranged to regulate the speed of said motors in response to said signals so that the geometric sum of movements of said tool in said first and second directions is constant and that the ratio of movements of said tool in said first and second directions, and hence the direction of actual movement of said tool, is proportional to the deviation of said first signal from said second signal.
Claim 3
Dependent Claim
27 words
A control system as defined in claim 1, wherein said first direction is parallel with and said second direction is normal to the axis of the workpiece.
Claim 4
Dependent Claim
15 words
A control system as defined in claim 1, wherein said characteristic curves are sinusoidal curves.
Claim 5
Dependent Claim
15 words
A control system as defined in claim 1, wherein said characteristic curves are straight lines.
Claim 6
Dependent Claim
84 words
A control system as defined in claim 4, wherein said tool has two mutually inclined cutting surfaces one of which makes with one of said directions a first acute angle and the other of which makes with the other of said directions a second acute angle, said regulating devices being arranged to regulate said motors within an angle exceeding 90 by two acute angles one of which is smaller than said first angle and the other of which is smaller than said second angle.
Claim 7
Dependent Claim
21 words
A control system as defined in claim 1, further comprising coordinate converter means connected between said regulating devices and said motors.
Claim 8
Dependent Claim
38 words
A control system as defined in claim 1, further comprising correcting means arranged to supply to said regulating devices signals representing the geometry of said tool and arranged to insure the removal of shavings having a constant thickness.
Claim 9
Dependent Claim
48 words
A control system as defined in claim 1, wherein each of said regulating devices has a predetermined regulating range and an operating range exceeding said regulating range, said devices being arranged to effect rapid movements of said tool in the respective directions when operating without said regulating range.
Claim 10
Dependent Claim
42 words
A control system as defined in claim 8, wherein said regulating devices are arranged to move the tool toward the workpiece when operating below said regulating range and to move the tool away from the workpiece when operating beyond said regulating range.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |