Patent US5117169A successfully refreshed from Google Patents.
US5117169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Numerical control device for a machine tool
Assignee: Mitutoyo Corp
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Filing: 1990-12-04
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Granted: 1992-05-26
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Expires: 2010-12-04
Abstract
Abstract A numerical control (NC) device 10 for a machine tool 1 provided with a measurement probe 2b effects measurements of a work 4 on the machine table 5 after a working process. A measurement program, generated by the NC device by modifying a working program, controls the relative movement of the probe 2b with respect to the workpiece 4 such that the probe 2b moves along the contour of the worked portion of the workpiece 4 with a displacement from the neutral position thereof, wherein the displacement of the probe is sampled at a predetermined sampling period. A working error calculation program 17 calculates the working error from the sampled displacements. If the working error is judged correctable, a outside tolerance range and correction re-working is effected so as to reduce the working error. The measurement/re-working cycles are repeated until the working error is within tolerance.
Inventors
- 👤 Yoshiaki Kakino
- 👤 Shigeaki Tokumo
- 👤 Tetsuo Nakamura
- 👤 Torao Takeshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:07
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/401; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37196; G05B2219/37198; G05B2219/37441; G05B2219/50; G05B2219/50057
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
217 words
A numerical control device for a machine tool including working means for machining a workpiece to a target form and dimensions, and measurement means for effecting on-machine measurements of the machined workpiece without changing a position of the workpiece on the machine tool, said numerical control device comprising: measurement programming means for generating a measurement program for controlling a measurement procedure of said measurement means; working error calculation means, connected to an output of said measurement means, for determining a working error of form and dimensions as measured by said measurement means with respect to a target form and dimensions as provided by said numerical control device to said machine tool, said working error calculation means judging whether said working error is within a tolerance range or not, and when said working error is judged outside of the tolerance range, whether the working eror is such that a correction re-working of the workpiece is possible or not; and correction re-working programming means for generating a correction re-working program when said working error is outside of the tolerance range and a correction re-working of the workpiece is judged possible, said correction re-working program controlling said working means in a re-working procedure by which the form and dimensions of the workpiece are corrected to the target form and dimensions.
Claim 2
Dependent Claim
217 words
A numerical control device for a machine tool including working means for machining a workpiece to a target form and dimensions, and measurement means for effecting on-machine measurements of the machined workpiece without changing a position of the workpiece on the machine tool, said numerical control device comprising: measurement programming means for generating a measurement program for controlling a measurement procedure of said measurement means; working error calculation means, connected to an output of said measurement means, for determining a working error of form and dimensions as measured by said measurement means with respect to a target form and dimensions as provided by said numerical control device to said machine tool, said working error calculation means judging whether said working error is within a tolerance range or not, and when said working error is judged outside of the tolerance range, whether the working eror is such that a correction re-working of the workpiece is possible or not; and correction re-working programming means for generating a correction re-working program when said working error is outside of the tolerance range and a correction re-working of the workpiece is judged possible, said correction re-working program controlling said working means in a re-working procedure by which the form and dimensions of the workpiece are corrected to the target form and dimensions.
Claim 3
Dependent Claim
83 words
A numerical control device as claimed in claim 1, wherein: said measurement means of the machine tool comprises a probe; said measurement program controls a relative movement of the probe with respect to the workpiece positioned on the machine tool such that the probe moves along a worked portion of the workpiece with a displacement from a neutral position of the probe; and said working error calculation means determines the working error from said displacement of the probe from the neutral position thereof.
Claim 4
Dependent Claim
26 words
A numerical control device as claimed in claim 2, wherein said working error calculation means samples the displacement of the probe at a predetermined sampling period.
References Cited (Backward Citations)
US3250012A
Cited
US3668653A
Cited
US3783253A
Cited
US4131837A
Cited
US4412295A
Cited
US4356552A
Cited
US4502108A
Cited
US4414495A
Cited
US4754404A
Cited
US4881021A
Cited
US4789931A
Cited
US4902951A
Cited
US4967127A
Cited
US4983899A
Cited
US5019763A
Cited
US4992711A
Cited
US4980627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |