Patent US3896360A successfully refreshed from Google Patents.
US3896360A
Expired / Lapsed
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Method and apparatus for automatic forward feed programmed control of a machine tool
Assignee: Siemens AG
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Filing: 1971-05-27
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Granted: 1975-07-22
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Expires: 1991-05-27
Abstract
Abstract A tool is rapidly fed until it comes into contact with a workpiece. The tool is work fed only after a magnitude depending upon the forming power exceeds a lower threshold level. The work feeding and movement of the tool are reduced in the direction of reduce feed-in for a period of time until the magnitude depending upon the forming power exceeds an upper threshold level. A feedin is additionally provided up to the programmed contour of the workpiece, additionally to moving the tool at reduced feedin, when the forming power reaches the upper threshold level, for a period of time sufficient for the magnitude to exceed the lower threshold level in dependence upon the forming power thereby providing optimum cutting distribution.
Inventors
- 👤 Jurgen Meyer
- 👤 Siegfried Waller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:53
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B19/4163; B; B23; B23Q; B23Q35/00; B23Q35/04; B23Q35/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
207 words
Apparatus for optimum adjustment of a digitally controlled machine tool in the machining process of a workpiece (W) wherein a control system of a programmed contour includes feeding means for transmitting appropriate control commands to the machine tool and for regulating the relative speed of the machine tool to the workpiece in accordance with the forming power applied to the workpiece in a manner whereby the feed speed is decreased when the forming power is increased and the feed speed is increased when the forming power is decreased, said apparatus comprising work feeding means for changing the programmed contour in the direction of decreasing processing depth (+y) when the forming power (Md) exceeds a predetermined level (Mmax) and for continuing the process in the direction of increasing processing depth (-y) to a maximum of the programmed contour when the forming power is less than a predetermined lower level (Mmax Delta ); reversible counter means for digitally storing deviations from the programmed contour; and additional work feeding means for additionally utilizing the deviations for controlling the movement (x, y) of the machine tool to decrease said deviations in a manner whereby the contour is repeatedly removed until the actual contour of the workpiece coincides with the programmed contour.
Claim 2
Dependent Claim
207 words
Apparatus for optimum adjustment of a digitally controlled machine tool in the machining process of a workpiece (W) wherein a control system of a programmed contour includes feeding means for transmitting appropriate control commands to the machine tool and for regulating the relative speed of the machine tool to the workpiece in accordance with the forming power applied to the workpiece in a manner whereby the feed speed is decreased when the forming power is increased and the feed speed is increased when the forming power is decreased, said apparatus comprising work feeding means for changing the programmed contour in the direction of decreasing processing depth (+y) when the forming power (Md) exceeds a predetermined level (Mmax) and for continuing the process in the direction of increasing processing depth (-y) to a maximum of the programmed contour when the forming power is less than a predetermined lower level (Mmax Delta ); reversible counter means for digitally storing deviations from the programmed contour; and additional work feeding means for additionally utilizing the deviations for controlling the movement (x, y) of the machine tool to decrease said deviations in a manner whereby the contour is repeatedly removed until the actual contour of the workpiece coincides with the programmed contour.
Claim 3
Dependent Claim
99 words
Apparatus as claimed in claim 1, further comprising reversible counter means 7, 9 for storing the deviation from the programmed contour and a variation in feed-in at a digit reference value output, pulse generating means (8, 10), measuring means for measuring the cutting power, critical value indicating means (11, 12, 13, 14) connected to said reversible counter means, said pulse generating means and said measuring means, said critical value indicating means having variable response levels and producing output signals for blocking the forward feed drive of the machine tool and controlling the reversible counter means and pulse generating means.
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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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |