Source: http://www.google.com/patents/US7912572?dq=5920316
Timestamp: 2015-03-01 16:11:12
Document Index: 578138377

Matched Legal Cases: ['art.\n24', 'art.\n25', 'art 124', 'art 124', 'art 124', 'art 124', 'art 124', 'art 124', 'art 124', 'art 124', 'art 124', 'art 124', 'art 124', 'art 124', 'art 124', 'art 124', 'art 124']

Patent US7912572 - Calibration assembly for an inspection system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA method of calibrating an inspection system is provided. The method includes contacting a test part with a run-out measurement device and rotating the test part and measuring a first run-out using the run-out measurement device. The method also includes moving the run-out measurement device to a new...http://www.google.com/patents/US7912572?utm_source=gb-gplus-sharePatent US7912572 - Calibration assembly for an inspection systemAdvanced Patent SearchPublication numberUS7912572 B2Publication typeGrantApplication numberUS 11/858,483Publication dateMar 22, 2011Filing dateSep 20, 2007Priority dateSep 20, 2007Also published asUS20090082899Publication number11858483, 858483, US 7912572 B2, US 7912572B2, US-B2-7912572, US7912572 B2, US7912572B2InventorsXiaoming Du, Kevin George Harding, Steven Robert Hayashi, Jianming Zheng, Tian Chen, Howard Paul Weaver, Yong Yang, Guofei Hu, James Allen Baird, Jr.Original AssigneeGeneral Electric CompanyExport CitationBiBTeX, EndNote, RefManPatent Citations (45), Non-Patent Citations (2), Referenced by (1), Classifications (15), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetCalibration assembly for an inspection system
US 7912572 B2Abstract
A method of calibrating an inspection system is provided. The method includes contacting a test part with a run-out measurement device and rotating the test part and measuring a first run-out using the run-out measurement device. The method also includes moving the run-out measurement device to a new position and repeating the steps of contacting and rotating the test part to measure a second run-out at the new position. The method further includes using the first and second run-outs to adjust measurements of the inspection system.
1. A method of calibrating an inspection system, comprising:
contacting a test part with a run-out measurement device;
measuring a first run-out using the run-out measurement device while the test part is rotating;
moving the run-out measurement device to a new position;
repeating the steps of contacting and rotating the test part to measure a second run-out at the new position; and
using the first and second run-outs to adjust measurements of the inspection system.
2. The method of claim 1, further comprising estimating calibration parameters from the first and second run-outs measured using the run-out measurement device.
3. The method of claim 2, wherein the calibration parameters are configured to substantially reduce an alignment error of rotary and chuck axes of a cutting tool.
4. The method of claim 3, wherein the calibration parameters comprise a distance between points of intersection of at least two section planes with the rotary and chuck axes of the cutting tool, an angle between line joining the points of intersection of the at least two section planes and an x-axis, or combinations thereof.
5. The method of claim 4, further comprising utilizing the calibration parameters to obtain parameters associated with the inspection system.
6. The method of claim 1, wherein the rotating step comprises rotating the test part at pre-determined rotating steps and measuring the run-out corresponding to each of the pre-determined rotating steps.
7. The method of claim 6, wherein the pre-determined rotating step comprises a rotation angle of less than about 1 degree.
8. The method of claim 7, wherein the pre-determined rotating step comprises a rotation angle of about 0.5 degrees.
9. A method of calibrating an inspection system, comprising:
rotating a test part to contact a displacement measurement device;
simultaneously rotating the test part and moving the displacement measurement device to a new position;
measuring a first displacement at the new position using the displacement measurement device;
rotating the test part at a pre-determined rotation angle;
repeating the steps of rotating the test part to contact the displacement measurement device and simultaneously rotating the test part and moving the displacement measurement device to measure a second displacement; and
using the first and second displacements to adjust measurements of the inspection system.
10. The method of claim 9, wherein simultaneously rotating the test part and moving the displacement measurement device comprises contacting the test part with the displacement measurement device at a plurality of locations.
11. The method of claim 10, further comprising measuring the first and second displacements at the plurality of locations using the displacement measurement device.
estimating calibration parameters from the first and second displacements measured from the displacement measurement device, wherein the calibration parameters are configured to reduce an alignment error of a rotary axis of a cutting tool with respect to a z-axis of the test part; and
utilizing the calibration parameters to obtain parameters associated with the inspection system.
13. A calibration assembly for an inspection system, comprising:
a servo motor configured to rotate a test part about a rotary axis at pre-determined rotating steps;
a run-out measurement device configured to measure first and second run-outs while the test part is rotating at respective first and second positions of the run-out measurement device; and
a processor configured to estimate calibration parameters from the first and second run-outs measured by the run-out measurement device.
14. The calibration assembly of claim 13, further comprising an optical encoder coupled to the servo motor for rotating the test part at the pre-determined rotating steps.
15. The calibration assembly of claim 13, wherein each of the pre-determined rotating steps comprises rotating the test part at a rotation angle of about less than 1 degree.
16. The calibration assembly of claim 13, wherein the run-out measurement device comprises a laser interferometer.
17. The calibration assembly of claim 13, wherein the inspection system comprises an inspection system for inspecting a cutting tool.
18. The calibration assembly of claim 17, wherein the calibration parameters are configured to substantially reduce an alignment error of rotary and chuck axes of the cutting tool.
19. The calibration assembly of claim 18, wherein the processor is configured to:
estimate parameters associated with the inspection system using the calibration parameters; and
correct measurements from the cutting tool using the calibration parameters.
20. A calibration assembly for an inspection system, comprising:
a displacement measurement device configured to measure first and second displacements while the test part is rotating at respective first and second positions of the displacement measurement device;
a slider configured to move the displacement measurement device along a z-axis; and
a processor configured to estimate calibration parameters from the first and second displacements measured using the displacement measurement device.
21. The calibration assembly of claim 20, further comprising an optical encoder coupled to the servo motor for rotating the test part at the pre-determined rotating steps.
22. The calibration assembly of claim 20, wherein the displacement measurement device comprises a micron indicator.
23. The calibration assembly of claim 20, wherein the calibration parameters are configured to substantially reduce an alignment error of a rotary axis of a cutting tool with respect to a z-axis of the test part.
24. The calibration assembly of claim 20, wherein the displacement measurement device is configured to measure the first and second displacements corresponding to a plurality of locations of the test part.
25. The calibration assembly of claim 24, wherein the processor is configured to estimate an angle between the rotary and x axes of the cutting tool. Description
The invention relates generally to calibration assembly for inspection systems, and particularly to calibration assembly for cutting tool inspection systems.
Various types of cutting tools are known and are in use for machining parts. Typically, each cutting tool has associated parameters to define the shape and profile of the cutting tool. Further, the performance of the machined parts depends upon such parameters. For example, a ball end mill has associated parameters such as axial primary relief angle, flute spacing, ball end radius and so forth. It is required to inspect the cutting tools from time-to-time for ensuring a desired performance of such tools. In general, the parameters associated with such tools are estimated and compared to desired values for determining the cutting performance of such tools. Particularly, it is desirable to determine such parameters for complex cutters having features defined by these parameters.
Typically, the physical part is sliced and an optical comparator or a hard gage is employed to measure the parameters at any section of the sliced part. However, this technique requires physical slicing of the tools thereby making them unusable for future machining. Certain other systems employ image processing techniques for estimating the tool parameters from captured projections. For example, a two-dimensional profile of the cutting tool may be captured using a camera and a run-out of the part may be estimated based upon the two-dimensional profile. However, such measurement techniques do not account for alignment errors due to orientation of the axes of the cutting tool and have relatively less accuracy.
Accordingly, it would be desirable to develop an improved technique for determining tool parameters for cutting tools. Particularly, it will be advantageous to develop a technique for accurate estimation of the tool parameters without damaging the tool.
Briefly, according to one embodiment, a method of calibrating an inspection system is provided. The method includes contacting a test part with a run-out measurement device and rotating the test part and measuring a first run-out using the run-out measurement device. The method also includes moving the run-out measurement device to a new position and repeating the steps of contacting and rotating the test part to measure a second run-out at the new position. The method further includes using the first and second run-outs to adjust measurements of the inspection system.
In another embodiment, a method of calibrating an inspection system is provided. The method includes rotating a test part to contact a displacement measurement device, simultaneously rotating the test part and moving the displacement measurement device to a new position and measuring a first displacement at the new position using the displacement measurement device. The method also includes rotating the test part at a pre-determined rotation angle, and repeating the steps of rotating the test part to contact the displacement measurement device and simultaneously rotating the test part and moving the displacement measurement device to measure a second displacement. The method further includes using the first and second displacements to adjust measurements of the inspection system.
In another embodiment, a calibration assembly for an inspection system is provided. The calibration assembly includes a servo motor configured to rotate a test part about a rotary axis at pre-determined rotating steps and a run-out measurement device configured to measure first and second run-outs corresponding to the test part at first and second positions of the run-out measurement device. The calibration assembly also includes a processor configured to estimate calibration parameters from the first and second run-outs measured by the run-out measurement device.
In another embodiment, a calibration assembly for an inspection system is provided. The calibration assembly includes a servo motor configured to rotate a test part about a rotary axis at pre-determined rotating steps, a slider configured to move the test part along a z-axis and a displacement measurement device configured to measure first and second displacements corresponding to the test part at first and second positions of the displacement measurement device. The calibration assembly also includes a processor configured to estimate calibration parameters from the first and second displacements measured using the displacement measurement device.
FIG. 1 is a diagrammatical illustration of a cutting tool in accordance with aspects of the present technique.
FIG. 2 is a diagrammatical illustration of an exemplary configuration of a system for calibrating an inspection system in accordance with aspects of the present technique.
FIG. 3 is a diagrammatical illustration of an exemplary error model employed for correcting alignment error between rotary and chuck axes of the cutting tool of FIG. 1.
FIG. 4 is a flow chart illustrating an exemplary process for calibrating the inspection system of FIG. 2 in accordance with aspects of the present technique.
FIG. 5 is a flow chart illustrating another exemplary process for calibrating the inspection system of FIG. 2 in accordance with aspects of the present technique.
FIG. 6 is a diagrammatical illustration of an exemplary configuration of the calibration assembly employed in the system of FIG. 2 in accordance with aspects of the present technique.
FIG. 7 is a graphical representation of exemplary results obtained from the calibration assembly of FIG. 6 in accordance with aspects of the present technique.
FIG. 8 is a diagrammatical illustration of another exemplary configuration of the calibration assembly employed in the system of FIG. 2 in accordance with aspects of the present technique.
FIG. 9 is a diagrammatical illustration of an exemplary configuration of the calibration assembly of FIG. 8 in accordance with aspects of the present technique.
FIG. 10 is a diagrammatical illustration of another exemplary configuration of the calibration assembly of FIG. 8 in accordance with aspects of the present technique.
FIG. 11 is a graphical representation of exemplary measurement data obtained using the calibration assemblies of FIGS. 9 and 10.
As discussed in detail below, embodiments of the present technique function to provide a technique for extraction of parameters of cutting tools employed in various applications such as ball end mills, flat end mills, drills and reamers. In particular, the present technique employs a calibration technique to account for alignment errors due to orientation of axes of the cutting tool and a test part for providing an accurate estimation of the parameters.
Turning now to drawings and referring first to FIG. 1, a cutting tool 10 is illustrated of the type that can be utilized in a machine or fixture, and inspected by an inspection system, the geometric characteristics of which can be determined by the present techniques. In the illustrated embodiment, the cutting tool 10 comprises a ball end mill. The ball end mill 10 is employed as a cutting tool in a vertical mill such as a mini-mill. As illustrated, the ball end mill 10 includes a shank 12 and a cylindrical cutting area 14. Further, the ball end mill 10 has a rounded tip 16 for milling grooves with a semi-circular cross-section.
The cutting area 14 includes a plurality of flutes 18 based upon a desired profile of the machined part and a plurality of cutting edges. For example, a 2-flute mill may be employed for cutting slots or grooves. Similarly, a 4-flute mill may be employed for a surface milling operation. The ball end mill 10 has a plurality of parameters corresponding to the cylindrical cutting area 14 and the rounded tip 16 that are representative of cutting performance of the mill 10. Examples of such parameters include, but are not limited to, axial primary relief angle, flute spacing, radial primary relief angle, radial rake angle, ball end radius, concentricity, core diameter, axial gash angle, axial rake angle, axial secondary clearance angle, helix angle, radial secondary clearance angle and shank diameter. The parameter extraction of such parameters to assess the cutting performance of the cutting tool such as the ball end mill 10 is performed using an inspection system. The present invention employs a calibration technique for calibration of such inspection systems, which will be described in detail below.
FIG. 2 is a diagrammatical illustration of an exemplary configuration 20 of a system for calibrating an inspection system 22. In this exemplary embodiment, the inspection system 22 includes a cutting tool inspection system configured to measure parameters 26 of a cutting tool 24. Examples of the cutting tool 24 include, but are not limited to, ball end mills, flat end mills, drills and reamers. Further, examples of the cutting tool parameters 26 include, but are not limited to, axial primary relief angle, flute spacing, radial primary relief angle, radial rake angle, ball end radius, concentricity, core diameter, axial gash angle, axial rake angle, axial secondary clearance angle, helix angle, radial secondary clearance angle and shank diameter.
Moreover, the system 20 includes a calibration assembly 28 for calibrating the inspection system 22. In particular, the calibration assembly 28 estimates calibration parameters 30 for correcting any alignment error due to orientation of the axes of the cutting tool 24. The system also includes a processor 32 for receiving the measured and calibration parameters 26 and 30 for estimating corrected parameters 34 corresponding to the cutting tool 24. It should be noted that the present invention is not limited to any particular processor for performing the processing tasks of the invention. The term �processor,� as that term is used herein, is intended to denote any machine capable of performing the calculations, or computations, necessary to perform the tasks of the invention. The term �processor� is intended to denote any machine that is capable of accepting a structured input and of processing the input in accordance with prescribed rules to produce an output. It should also be noted that the phrase �configured to� as used herein means that the processor is equipped with a combination of hardware and software for performing the tasks of the invention, as will be understood by those skilled in the art
In certain embodiments, the calibration parameters 30 may be stored in a memory circuitry 36 and may be utilized to estimate the corrected parameters 34 for future measurements from the cutting tool 24. The memory circuitry 36 may include hard disk drives, optical drives, tape drives, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), redundant arrays of independent disks (RAID), flash memory, magneto-optical memory, holographic memory, bubble memory, magnetic drum, memory stick, tape, smartdisk, thin film memory, zip drive, and so forth. Further, the corrected parameters 34 may be made available to a user of the system 30 via a display 38. The details of the calibration assembly 28 and the calibration process will be described in detail below with reference to FIGS. 3-10.
FIG. 3 is a diagrammatical illustration of an exemplary error model 50 employed for correcting alignment error between rotary and chuck axes 52 and 54 of the cutting tool 24 of FIG. 2. In this exemplary embodiment, at least two section planes such as represented by reference numerals 56 and 58 are selected. The two section planes 56 and 58 are located at heights h1 and h2 respectively. The section plane 56 intersects the rotary and chuck axes 52 and 54 at two intersections points represented by reference numerals 60 and 62. Similarly, the section plane 58 intersects the rotary and chuck axes 52 and 54 at two intersections points represented by reference numerals 64 and 66.
The distance (r1) between the intersection points 60 and 62 is represented by reference numeral 68 and the distance (r2) between the intersection points 64 and 66 is represented by reference numeral 70. Further, an angle (α1) between an X-axis and a line joining the intersection points 60 and 62 is represented by reference numeral 72. Similarly, an angle (α2) between the X-axis and a line joining the intersection points 64 and 66 is represented by reference numeral 74. In this exemplary embodiment, the parameters h1, h2, r1, r2, α1, and α2 are utilized to calibrate the inspection system 22 of FIG. 2. The details of the calibration of the inspection system 22 using the error model 50 will be described in a greater detail below.
FIG. 4 is a flow chart illustrating an exemplary process 80 for calibrating the inspection system 22 of FIG. 2. At step 82, a test part is contacted with a run-out measurement device. Further, the test part is rotated and a first run-out corresponding to the test part is measured using the run-out measurement device (step 84). In certain embodiments, the test part is rotated at pre-determined rotating steps and the run-out for the test part is measured at each of these pre-determined rotating steps. In one embodiment, the pre-determined rotating step comprises a rotation angle of less than about 1 degree. In another embodiment, the pre-determined rotating step comprises a rotation angle of about 0.5 degrees. At step 86, the run-out measurement device is moved to a new position along a z-direction. Further, at step 88, the steps of contacting and rotating the test part (steps 82, 84) are repeated to measure a second run-out corresponding to the test part. In this exemplary embodiment, the first and second run-outs measured by the run-out measurement device are utilized to estimate the calibration parameters such as described above for the inspection system 22. Advantageously, the calibration parameters reduce an alignment error of the rotary and chuck axes of the cutting tool. Further, the calibration parameters are employed to correct the measurements made by the inspection system 22.
FIG. 5 is a flow chart illustrating another exemplary process 100 for calibrating the inspection system 22 of FIG. 2 in accordance with aspects of the present technique. At step 102, the test part is rotated to contact a displacement measurement device. Further, at step 104, the test part and the displacement measurement device are moved to a new position. In this exemplary embodiment, the test part and the displacement measurement device are moved such that the test part contacts the displacement measurement device at a plurality of locations. In one exemplary embodiment, the test part contacts the displacement measurement device at four locations. Further, heights and rotary angles at two edge points may represent the calibration parameters h1, h2, α1, and α2. The displacement measurement device is then used to measure a first displacement at this new position, as represented by step 106. The displacement measurements at different rotation angles may be plotted and a curve is fitted through such data points. Further, a slope (slope 1) of this curve is estimated.
At step 108, the test part is rotated at a pre-determined rotation angle. In this exemplary embodiment, the test part is rotated at about 180 degrees. Further, the steps of rotating the test part and the simultaneously moving the displacement measurement device (steps 102 and 104) are repeated to measure a second displacement (step 110). Again, as described above, the displacement measurements at different rotation angles may be plotted and a curve is fitted through such data points. Further, a slope (slope 2) of this curve is estimated. Moreover, an angle between a z-stage and the rotary axis in a XOZ plane is determined by estimating an average of slope 1 and slope 2. As will be appreciated by one skilled in the art, the technique described above may be similarly employed to estimate an angle between the z-stage and the rotary axis in a YOZ plane. Advantageously, estimation of parameters such as the angles between the z-stage and the rotary axis in the XOZ and YOZ planes substantially reduces any alignment error due to orientation of rotary axis of the test part and the z-axis.
FIG. 6 is a diagrammatical illustration of an exemplary configuration 120 of the calibration assembly 28 employed in the system 22 of FIG. 2 in accordance with aspects of the present technique. In this exemplary embodiment, the calibration assembly 120 is configured to calibrate a cutting tool inspection system. Further, the cutting tool may include a ball end mill, or a flat end mill, or a drill, or a reamer. The calibration assembly 120 includes a servo motor 122 configured to rotate a test part 124 about a rotary axis 126 at pre-determined rotating steps.
Further, the calibration assembly 120 includes a run-out measurement device 128 configured to measure first and second run-outs corresponding to the test part 124 at first and second positions of the run-out measurement device 128. In one exemplary embodiment, the run-out measurement device 128 includes a laser interferometer. In this embodiment, the laser interferometer 128 includes a laser 130, a reflective mirror 132 and an interferometry mirror 134. Moreover, the first and second run-outs are utilized by the processor 32 (see FIG. 2) for estimating the calibration parameters 30 (see FIG. 2) from the first and second run-outs measured by the run-out measurement device 128.
In certain embodiments, the calibration assembly 120 includes an optical encoder 220 coupled to the servo motor 122 for rotating the test part 124 at the pre-determined rotating steps. In one exemplary embodiment, each of the pre-determined rotating steps comprises a rotation angle of about less than 1 degree. In another exemplary embodiment, each of the pre-determined rotating steps comprises a rotation angle of about 0.5 degrees. In operation, the test part 124 is rotated at the pre-determined rotating steps. Further, the run-out measurements are obtained for each of the rotating steps using the laser interferometer 128. In this exemplary embodiment, the run-out measurement device 128 is moved along a z-direction as represented by reference numeral 136. The test part 124 is subsequently rotated at the pre-determined rotating steps as described above and the run-out measurements are obtained for each of the rotating steps at the new location of the run-out measurement device 128. Such run-out measurements are utilized to obtain the calibration parameters for the inspection system 22 (see FIG. 2).
FIG. 7 is a graphical representation of exemplary results 140 obtained from the calibration assembly 120 of FIG. 6 in accordance with aspects of the present technique. In this exemplary embodiment, the abscissa axis represents a rotation angle 142 of the test part 124 and the ordinate axis represents a run-out measurement 144 from the run-out measurement device 128. The run-out measurements corresponding to different rotation angles at a first location of the run-out measurement device 128 are represented by exemplary profile 146. Further, the run-out measurements corresponding to different rotation angles at a second location of the run-out measurement device 128 are represented by exemplary profile 148. In this exemplary embodiment the first and second locations of the run-out measurement device are at a height of about 0.5 inches and 3.5 inches respectively from the base of the test part 124. The run-out measurements 146 and 148 are further utilized to estimate the calibration parameters for the inspection system 22.
FIG. 8 is a diagrammatical illustration of another exemplary configuration 160 of the calibration assembly 28 employed in the system of FIG. 2 in accordance with aspects of the present technique. In this exemplary embodiment, the calibration assembly 160 is configured to calibrate the inspection system 22 for reducing an alignment error of the rotary axis 126 of the cutting tool 24 (see FIG. 2) with respect to a z-axis 162. As illustrated, the calibration assembly 160 includes the servo motor 122 configured to rotate the test part 124. The calibration assembly 160 also includes a displacement measurement device such as micron indicator 166 configures to measure first and second displacements corresponding to the test part at first and second positions of the displacement measurement device 166. The calibration assembly 160 includes a slider 164 configured to move the displacement measurement device 166 along the z-axis 162. Further, the processor 32 is configured to estimate the calibration parameters for the inspection system 22 using the first and second displacement measurements. In one exemplary embodiment, the processor 32 is configured to estimate an angle between the rotary and x-axes of the cutting tool 26.
In operation, the test part 124 is rotated at a first angle so that the test part 124 contacts the displacement measurement device 166 through at least one contact point as shown in FIG. 9. FIG. 9 is a diagrammatical illustration of an exemplary configuration 170 of the calibration assembly 160 of FIG. 8. In this exemplary embodiment, the rotary and chuck axes are represented by reference numerals 172 and 174. Further, the z-axis is represented by reference numeral 176. The test part 124 is rotated at a pre-determined angle of rotation to contact the run-out measurement device 166 (see FIG. 8) at a first point 178. Further, the run-out measurement device 166 and the test part 124 are moved simultaneously to a second location such that points represented by reference numerals 180, 182 and 184 contact the displacement measurement device 166. In this exemplary embodiment, the displacement measurements are obtained at each of these contact points 178, 180, 182 and 184. Such measurements are utilized to estimate the calibration parameters for the inspection system 22 (see FIG. 2). In this exemplary embodiment, the rotary angle at points 178 and 184 represent angles α1, and α2 of the error model 50 of FIG. 3. Further, measurements corresponding to contact points 180 and 182 represent interpolation points between the contact points 178 and 184. The data corresponding to these points is plotted and a curve (not shown) may be fitted through these points 178, 180, 182 and 184. Further, a slope (slope 1) of such curve is determined.
The test part is then rotated at about 180 degrees to set up a configuration 190 as illustrated in FIG. 10. Further, the steps of rotating the test part 124 at the predetermined angle of rotation to contact the displacement measurement device 166 at the first point 178 and simultaneously moving the displacement measurement device 166 and the test part 124 such that the points 180, 182 and 184 contact the displacement measurement device 128 are repeated. Further, the displacement measurements are obtained at each of these contact points 178, 180, 182 and 184 and such measurements are utilized to estimate the calibration parameters for the inspection system 22. Again, the data corresponding to these points is plotted and a slope (slope 2) of a curve through these points is determined.
FIG. 11 is a graphical representation of exemplary measurements 200 obtained from the calibration assemblies of FIGS. 9 and 10 in accordance with aspects of the present technique. The abscissa axis represents the measurement of the distance 202 moved by the test part 124 (see FIGS. 9 and 10) and the ordinate axis represents the measurement 204 obtained from the displacement measurement device 166 (see FIG. 8). In this exemplary embodiment, the curves fitted through points 178, 180, 182 and 184 at rotations of 0 degree and 180 degrees respectively are represented by reference numerals 206 and 208. Further, profile 210 represents curve having a slope that is average of slope 1 and slope 2 of curves 206 and 208 respectively. It should be noted that this average slope determines an angle between the axis of the test part and rotary axis in a XOZ plane.
The various aspects of the method described hereinabove have utility in parameter extraction of a variety of cutting tools such as ball end mills, flat end mills, drills, and reamers. As described above, the present technique employs a calibration technique to account for alignment errors due to orientation of axes of the cutting tool and a test part for providing an accurate estimation of the parameters. Advantageously, the technique enables consistent measurement of all cutting tool dimensions for a variety of cutting tools.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3892042 *Jan 14, 1974May 28, 1991 Electronic run-out compensator and method of electronically compensating for wobble run-out in a rotating bodyUS4138825 *Sep 26, 1977Feb 13, 1979Fmc CorporationMethod and apparatus for providing runout compensationUS4355900 *Aug 8, 1980Oct 26, 1982The United States Of America As Represented By The Secretary Of The Air ForceSelf-calibrating interferometerUS4444061 *Mar 26, 1982Apr 24, 1984Camtech Inc.Force and torque sensor for machine toolsUS4702101 *Aug 12, 1985Oct 27, 1987Proquip, Inc.Apparatus and method for testing the calibration of a hard disk substrate testerUS4974165 *Nov 28, 1988Nov 27, 1990Mechanical Technology IncorporatedReal time machining control system including in-process part measuring and inspectionUS4991304 *Jun 10, 1988Feb 12, 1991RenishawWorkpiece inspection methodUS5140534 *Jul 20, 1990Aug 18, 1992Westinghouse Electric Corp.Centerless runout and profile inspection system and methodUS5257460 *Jun 8, 1992Nov 2, 1993Renishaw Metrology LimitedMachine tool measurement methodsUS5359885 *Apr 1, 1993Nov 1, 1994Hofmann Maschinenbau GmbhMethod of measuring run-out of a rotary memberUS5430948 *Jul 12, 1993Jul 11, 1995Vander Wal, Iii; H. JamesCoordinate measuring machine certification systemUS5923435 *Jun 26, 1997Jul 13, 1999Ohio Electronic Engravers, Inc.Engraver and engraving method for detecting and measuring run-out associated with a cylinderUS6161055 *Dec 1, 1995Dec 12, 2000Laser Measurement International Inc.Method of determining tool breakageUS6233533 *Jun 4, 1998May 15, 2001Performance Friction CorporationTurning center with integrated non-contact inspection systemUS6568096 *Feb 14, 2000May 27, 2003Obschestvo s Ogranichennoi Otvetctvennostju �Tekhnomash�Device and method for measuring shape deviations of a cylindrical workpiece and correcting steadying element and correcting follower for use therewithUS6580964 *Sep 3, 2002Jun 17, 2003Renishaw PlcCalibrations of an analogue probe and error mappingUS6752031 *Jun 1, 2001Jun 22, 2004Mori Seiki Co., Ltd.NC machine tool having spindle run-out diagnosing functionUS6839975 *Oct 11, 2002Jan 11, 2005Mori Seiki Co., LtdAccuracy measuring apparatus for machine toolUS6884204 *Aug 21, 2003Apr 26, 2005Mori Seiki Co., Ltd.Machine toolUS6964102 *May 31, 2001Nov 15, 2005Dr. Johannes Heidenhain GmbhDevice and method for detecting the rotational movement of an element rotatably mounted about an axisUS7026637 *Jun 26, 2003Apr 11, 2006The Boeing CompanyMethod and system for measuring runout of a rotating toolUS7055367 *Nov 1, 2002Jun 6, 2006Renishaw PlcCalibration of a probeUS7079969 *Mar 6, 2003Jul 18, 2006Renishaw PlcDynamic artefact comparisonUS7131207 *Dec 5, 2003Nov 7, 2006Renishaw PlcWorkpiece inspection methodUS7173691 *Dec 22, 2003Feb 6, 2007Qed Technologies International, Inc.Method for calibrating the geometry of a multi-axis metrology systemUS7191535 *Feb 28, 2005Mar 20, 2007United Technologies CorporationOn-machine automatic inspection of workpiece features using a lathe rotary tableUS7210321 *May 14, 2004May 1, 2007Dana Australia Pty Ltd.Method and apparatus for measuring centerline runout and out of roundness of a shaftUS7246448 *Nov 25, 2005Jul 24, 2007Carl Zeiss Industrielle Messtechnik GmbhMethod for calibrating a probeUS7254506 *Jul 4, 2003Aug 7, 2007Renishaw, PlcMethod of calibrating a scanning systemUS7268886 *Jun 24, 2004Sep 11, 2007Korea Research Institute Of Standards And ScienceMethod and apparatus for simultaneously measuring displacement and angular variationsUS7286949 *Aug 10, 2006Oct 23, 2007Renishaw PlcMethod of error correctionUS7328125 *Aug 31, 2006Feb 5, 2008Canon Kabushiki KaishaMeasuring method of cylindrical bodyUS7408650 *Aug 21, 2007Aug 5, 2008Mitutoyo CorporationOptical-axis deflection type laser interferometer, calibration method thereof, correcting method thereof, and measuring method thereofUS7523561 *Mar 31, 2008Apr 28, 2009Renishaw PlcMeasuring methods for use on machine toolsUS7533574 *Nov 15, 2004May 19, 2009Renishaw PlcMethod of error compensationUS7568373 *Sep 22, 2004Aug 4, 2009Renishaw PlcMethod of error compensation in a coordinate measuring machineUS20030210060 *Apr 3, 2003Nov 13, 2003Minebea Co., Ltd.Method and device for measuring the repeatable and non-repeatable runout of rotating components of a spindle motorUS20040015326 *Jul 19, 2002Jan 22, 2004Keith BluesteinComputerized electronic runoutUS20040195922 *Jan 21, 2004Oct 7, 2004Hsu Jin-JuhMethod for reducing the altitudinal errors and run-out of a spindle motor and a slim-type spindle motorUS20050253054 *May 17, 2004Nov 17, 2005Xerox Corporation.Encoder runout error correction circuitUS20070010959 *Apr 15, 2006Jan 11, 2007Hon Hai Precision Industry Co., Ltd.System and method for error compensation of a coordinate measurement machineUS20070124015Nov 30, 2005May 31, 2007Tian ChenSystem and method for extracting parameters of a cutting toolUS20070145932 *Dec 21, 2006Jun 28, 2007Fanuc Ltd Of Yamanashi, JapanController for machine toolUS20070244659 *Aug 23, 2006Oct 18, 2007General Electric CompanyMethod of aligning probe for eddy current inspectionUS20080189934 *Apr 25, 2006Aug 14, 2008Renishaw PlcRotary Encoders* Cited by examinerNon-Patent CitationsReference1Charlie C. L. Wang, Terry K. K. Chang, Matthew M .F. Yuen; "From laser-scanned data to feature human model: a system based on fuzzy logic concept"; Computer-Aided Design 35(3): 241-253 (2003).2Tsuneo Kagawa, Hiroaki Nishino, Kouichi Utsumiya; "A Sensitive Coloring and Texture Mapping on 3D Shapes"; 2004 IEEE International Conference on Systems, Man and Cybernetics; pp. 5748-5753.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8437968 *Aug 5, 2008May 7, 2013Abb Technology AgMethod and apparatus for calculating the maximum displacement of a rotating shaft* Cited by examinerClassifications U.S. Classification700/174, 73/1.01, 700/254, 702/85International ClassificationG01N3/62, G05B15/00, G06F19/00, G05B19/18, G01D18/00Cooperative ClassificationB23Q17/22, G05B2219/37069, G05B2219/49177, G05B19/4015European ClassificationG05B19/401C, B23Q17/22Legal EventsDateCodeEventDescriptionOct 31, 2014REMIMaintenance fee reminder mailedSep 20, 2007ASAssignmentOwner name: GENERAL ELECTRIC COMPANY, NEW YORKFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DU, XIAOMING;HARDING, KEVIN GEORGE;HAYASHI, STEVEN ROBERT;AND OTHERS;REEL/FRAME:019855/0444;SIGNING DATES FROM 20070913 TO 20070918Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DU, XIAOMING;HARDING, KEVIN GEORGE;HAYASHI, STEVEN ROBERT;AND OTHERS;SIGNING DATES FROM 20070913 TO 20070918;REEL/FRAME:019855/0444RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services