US5220510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coordinate system correcting apparatus for machine tool
Assignee: Toyota Motor Corp
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Filing: 1991-03-27
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Granted: 1993-06-15
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Expires: 2011-03-27
Abstract
Abstract A coordinate system correcting apparatus corrects a reference coordinate system set for a work space of a machine tool. A plurality of jig members are distributed on a work table of the machine tool, each of the jig members has a plurality of right-angled parallelepiped recesses, and an intersection of three orthogonal planes of each of the recesses forms a space lattice point. The space lattice points defined by the jig members coincide with predetermined normal space lattice points if the machine tool is not distorted, and if the machine tool is distorted, deviate from the normal space lattice points. Eight adjacent space lattice points are located at vertexes of a hexahedron, respectively. When the machine tool is distorted, the jig members define distorted space lattice points, which are measured with a probe unit. According to the normal space lattice points and distorted space lattice points, the reference coordinate system is three-dimensionally corrected for each of the hexahedrons.
Inventors
- 👤 Hiromi Araki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:52
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/401; G05B19/4015; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37619; G05B2219/50; G05B2219/50132; G05B2219/50135
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
227 words
A coordinate system correcting apparatus for correcting a reference coordinate system set for a work space of a machine tool, the coordinate system of the machine tool having orthogonal axes X, Y, and Z, the coordinate system correcting apparatus comprising: jig means for defining a plurality of space lattice points that are three-dimensionally arranged to serve as references of a reference coordinate system, the space lattice points defined by the jig means coinciding with predetermined normal space lattice points when the machine tool is not distorted, wherein eight adjacent normal space lattice points are positioned at vertexes of a hexahedron respectively, any one of three pairs of opposing two faces of the hexahedron being in parallel with each other and the three pairs of opposing two faces of the hexahedron being in parallel with planes X-Y, X-Z, and Y-Z of the coordinate system of the machine tool respectively; storage means for storing the positions of the normal space lattice points; measuring means for measuring distorted space lattice points defined by the jig means, the distorted space lattice points deviating from the normal space lattice points when the machine tool is distorted; and correcting means for three-dimensionally correcting the reference coordinate system according to each normal hexahedron formed from eight adjacent normal space lattice points and each corresponding distorted hexahedron formed from eight adjacent distorted space lattice points.
Claim 2
Dependent Claim
227 words
A coordinate system correcting apparatus for correcting a reference coordinate system set for a work space of a machine tool, the coordinate system of the machine tool having orthogonal axes X, Y, and Z, the coordinate system correcting apparatus comprising: jig means for defining a plurality of space lattice points that are three-dimensionally arranged to serve as references of a reference coordinate system, the space lattice points defined by the jig means coinciding with predetermined normal space lattice points when the machine tool is not distorted, wherein eight adjacent normal space lattice points are positioned at vertexes of a hexahedron respectively, any one of three pairs of opposing two faces of the hexahedron being in parallel with each other and the three pairs of opposing two faces of the hexahedron being in parallel with planes X-Y, X-Z, and Y-Z of the coordinate system of the machine tool respectively; storage means for storing the positions of the normal space lattice points; measuring means for measuring distorted space lattice points defined by the jig means, the distorted space lattice points deviating from the normal space lattice points when the machine tool is distorted; and correcting means for three-dimensionally correcting the reference coordinate system according to each normal hexahedron formed from eight adjacent normal space lattice points and each corresponding distorted hexahedron formed from eight adjacent distorted space lattice points.
Claim 3
Dependent Claim
95 words
A coordinate system correcting apparatus as set forth in claim 1, wherein the jig means comprises a plurality of jig members distributed on a work table of the machine tool, each of the jig members extending along the Z axis orthogonal to the work table and having a recess shaped as a right-angled parallelepiped and located at a position corresponding to one of the normal space lattice points, and wherein a point at which all of the three orthogonal planes of the recess intersect forms one of space lattice points defined by the jig means.
Claim 4
Dependent Claim
61 words
A coordinate system correcting apparatus as set forth in claim 2, wherein each of the jig members has a plurality of recesses disposed along the Z axis and separated from one another, and wherein a point at which all of the three orthogonal planes of each of the recesses intersect forms one of space lattice points defined by the jig means.
Claim 5
Dependent Claim
43 words
A coordinate system correcting apparatus as set forth in claim 3, wherein the three orthogonal planes of each of the recesses for forming the space lattice points defined by the jig means are in parallel with the planes X-Y, X-Z, and Y-Z, respectively.
Claim 6
Dependent Claim
55 words
A coordinate system correcting apparatus as set forth in claim 4, wherein the measuring means has a probe for providing a signal when coming into contact with the surface of an object to be measured, and three linear position sensors for providing coordinates on the X, Y, and Z axes of the machine tool, respectively.
Claim 7
Dependent Claim
68 words
A coordinate system correcting apparatus as set forth in claim 5, wherein a reference point is set on each of the three orthogonal planes of each of the recesses of the jig member, and according to three-dimensional coordinates measured by the measuring means of the reference points on the three planes, three-dimensional coordinates of one of the distorted space lattice points defined by the jig means are computed.
Claim 8
Dependent Claim
41 words
A coordinate system correcting apparatus as set forth in claim 6, further comprising display means for displaying the magnitude of a three-dimensional distortion of the machine tool obtained at each reference point from the measured three-dimensional coordinates of the reference point.
Claim 9
Dependent Claim
51 words
A coordinate system correcting apparatus as set forth in claim 6, further comprising display means for displaying the magnitude of a three-dimensional distortion of the machine tool obtained at each reference point from the measured three-dimensional coordinates of the reference point with predetermined colors depending on the magnitude of the distortion.
Claim 10
Dependent Claim
73 words
A coordinate, system correcting apparatus as set forth in claim 6, wherein, to process a workpiece, the coordinate system is three-dimensionally corrected according to each normal hexahedron formed from eight adjacent normal space lattice points and each corresponding distorted hexahedron formed from eight adjacent distorted space lattice points, and three-dimensional coordinate instruction values for the position of a tool in a distorted coordinate system computed from the distorted space lattice points are computed.
Claim 11
Dependent Claim
74 words
A coordinate system correcting apparatus as set forth in claim 6, wherein, to measure a processed workpiece, the coordinate system is three-dimensionally corrected according to each normal hexahedron formed from eight adjacent normal space lattice points and each corresponding distorted hexahedron formed from eight adjacent distorted space lattice points, and three-dimensional coordinate instruction values for the position of the probe in a distorted coordinate system computed from the distorted space lattice points are computed.
Claim 12
Dependent Claim
77 words
A coordinate system correcting apparatus as set forth in claim 9 or 10, wherein the position of the tool or the probe in the distorted hexahedron is computed according to three sets of ratios of distances from three pairs of opposing two faces of the normal hexahedron to the position of the tool or the probe, thereby computing the three-dimensional coordinate instruction values of the position of the tool or the probe in the distorted coordinate system.
Claim 13
Dependent Claim
150 words
A coordinate system correcting apparatus as set forth in claim 11, wherein three sets of ratios of distances from three pairs of opposing two faces of the normal hexahedron to the position of the tool or the probe are employed to find projected points of the position of the tool or the probe on each of the six planes of the distorted hexahedron, the projected points on the three pairs of the opposing two faces of the distorted hexahedron are connected to each other to provide three straight lines on which three imaginary points corresponding to the position of the tool or the probe are set according to the ratios of the distances, and the three imaginary points are arithmetically averaged to provide an averaged point whose three dimensional coordinates serve as three-dimensional coordinate instruction values for the position of the tool or the probe in the distorted coordinate system.
Claim 14
Dependent Claim
57 words
A coordinate system correcting apparatus as set forth in claim 6, wherein, to measure a processed workpiece, measured three-dimensional coordinates of the workpiece in a distorted coordinate system computed from the distorted space lattice points are three-dimensionally converted into measured three-dimensional coordinates of the workpiece in a normal coordinate system computed from the normal space lattice points.
Claim 15
Dependent Claim
57 words
A coordinate system correcting apparatus as set forth in claim 13, wherein the coordinate system is three-dimensionally changed according to each distorted hexahedron formed from eight adjacent distorted space lattice points and each corresponding normal hexahedron formed from eight adjacent normal space lattice points, thereby computing measured three-dimensional coordinates of the workpiece in the normal coordinate system.
Claim 16
Dependent Claim
63 words
A coordinate system correcting apparatus as set forth in claim 14, wherein a measured point of the workpiece in the normal hexahedron is computed according to three sets of ratios of distances from three pairs of opposing two faces of the distorted hexahedron to the measured point of the workpiece, thereby computing measured three-dimensional coordinates of the workpiece in the normal coordinate system.
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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) | 1996-06-14 | 1996-12-14 | 1997-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-14 | 2000-12-14 | 2001-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-14 | 2004-12-14 | 2005-06-15 | $7700.00 | Window Closed / Lapsed |