MEASURING APPARATUS AND MEASURING METHOD THEREOF, APPARATUS FOR CORRECTING PROCESSING POSITION OF CUTTING MACHINE AND METHOD THEREOF FOR CORRECTING PROCESSING POSITION, AND IMAGING APPARATUS AND CUTTING MACHINE COMPRISING THE SAME

• US 20120038763A1
• Filed: 04/20/2010
• Published: 02/16/2012
• Est. Priority Date: 04/28/2009
• Status: Active Grant

• Current Assignee: Fuji Company Limited
• Original Assignee: Fuji Machine Manufacturing Company Limited
• Inventors: Kato, Masaki, Kawada, Tosuke, Ichino, Shinji
• Granted Patent: US 8,885,038 B2
• Time in Patent Office: Days
• US Class Current: 348/95
• CPC Class Codes: B23B 25/06 Measuring, gauging, or adjusting equipment on turning-machines for setting-on, feeding, controlling, or monitoring the cutting tools or work measuring devices or gauges G01B
• CPC Class Codes: B23Q 11/0003 Arrangements for preventing undesired thermal effects on tools or parts of the machine B23Q11/10, B23Q11/12 and B23Q11/14 take precedence
• CPC Class Codes: B23Q 17/09 for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool arrangements preventing overload of tools B23Q11/04; devices for indicating failure of drills during boring B23B49/00
• CPC Class Codes: B23Q 17/0909 Detection of broken tools
• CPC Class Codes: B23Q 17/0928 Cutting angles of lathe tools
• CPC Class Codes: B23Q 17/0985 by measuring temperature
• CPC Class Codes: B23Q 17/20 for indicating or measuring workpiece characteristics, e.g. contour, dimension, hardness
• CPC Class Codes: B23Q 17/249 using image analysis, e.g. for radar, infrared or array camera images
• CPC Class Codes: B23Q 17/2495 using interferometers
• CPC Class Codes: G01K 2217/00 Temperature measurement using electric or magnetic components already present in the system to be measured
• CPC Class Codes: G01K 5/50 arranged for free expansion or contraction
• CPC Class Codes: G01N 21/86 Investigating moving sheets G01N21/89 takes precedence
• CPC Class Codes: H04N 7/18 Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
• CPC Class Codes: Y10T 83/162 With control means responsive to replaceable or selectable information program

Abstract

Provided is an apparatus and a method thereof which can detect a displacement amount of a cutting tool with respect to a workpiece with high accuracy and can correct a processing position with high accuracy. Accordingly, a turret gauge 46 is comprised of an invar body 47 and a gauge main body 48 with a different thermal expansion coefficient. A point A of the gauge main body 48 and a leading edge 47A of the invar body are imaged in a state of viewing the whole thereof at a time of an initialization and a calibration cycle (CS), and a temperature of the gauge main body 48 is detected by comparing each image data. Furthermore, the length between the point A and a point B of the gauge main body 48 at the time of the CS is obtained based on the image data. The actual length is compared with a theoretical length between the point A and the point B at a temperature of the gauge main body 48 at the time of the CS, and consideration is given to the comparison. Therefore, a heat displacement amount of a ball screw can be accurately detected, the displacement of a processing position of a cutting tool can be corrected with high accuracy, and processing accuracy of a workpiece can be improved.

Claims

1. A measuring apparatus comprising:

a reference body which is a reference of a heat displacement amount of a heat-displaced object to be measured;

an imaging means for imaging the reference body and the object to be measured in a same imaging area;

a recording means for recording reference image data at a reference temperature generated by the imaging means;

a collating means for collating the reference image data, which has been recorded in advance in the recording means, with measured image data at a time of an arbitrary measurement, which is generated by the imaging means; and

a calculating means for calculating a temperature of the object to be measured at the time of the arbitrary measurement based on a collation result by the collating means.

2. A measuring method which images, as a subject, a reference body which is a reference of a heat displacement amount of a heat-displaced object to be measured in a same imaging area in an imaging means;

collates reference image data at a reference temperature, which has been recorded in advance in a recording means, with measured image data at a time of an arbitrary measurement by a collating means; and

measures a temperature of the object to be measured at the time of the arbitrary measurement based on a collation result by the collating means.

3. An apparatus for correcting a processing position of a cutting machine, comprising:

an imaging means for imaging a subject;

a reference gauge for measuring a position error of the imaging means;

a reference means, which is arranged on a mounting table where a cutting tool is to be mounted, for detecting a displacement amount of a cutting tool and a temperature of the mounting table;

a recording means for recording reference image data at a reference temperature, in which the reference gauge and the reference means corresponding to the reference gauge are imaged as a subject in a same imaging area by the imaging means;

a collating means for collating the reference image data, which has been recorded in advance in the recording means, with measured image data at a time of an arbitrary measurement of the subject, which is generated by the imaging means; and

a correcting means for correcting a processing position of the cutting tool based on a collation result by the collating means.

5. The apparatus for correcting the processing position of the cutting machine according to claim 3, wherein the reference means comprises:

a mounting means which has an identical quality of material to that of a metal constituting the mounting table and has a reference section; and

a reference body which has a free end fixed to only one end thereof and corresponding to the reference section, and which is a reference of a heat displacement amount of the mounting means.

6. The apparatus for correcting the processing position of the cutting machine according to claim 5, wherein the mounting means comprises at least two or more of measurement base points.

7. The apparatus for correcting the processing position of the cutting machine according to claim 5, wherein the reference body is formed with a material with a different thermal expansion coefficient from that of the metal constituting the mounting table.

8. The apparatus for correcting the processing position of the cutting machine according to claim 5, wherein the reference body is a bimetal body.

4. A method for correcting a processing position of a cutting machine, which establishes correspondence between a reference gauge for measuring a position error of an imaging means, and a reference means which is arranged on a mounting table in order to detect a displacement amount of a cutting tool and a temperature of the mounting table of the cutting tool;

images, as a subject of the imaging means, the corresponding reference gauge and the corresponding reference means in a same imaging area in the imaging means;

collates reference image data at a reference temperature, which has been recorded in advance in a recording means, with measured image data at a time of an arbitrary measurement by a collating means; and

corrects a processing position of the cutting tool based on a collation result by the collating means.

9. An apparatus for correcting a processing position of a cutting machine, comprising:

an imaging means for imaging a subject;

a reference gauge which is arranged on a chuck for holding a workpiece in order to measure a position error of the imaging means;

a reference body which is arranged in such a manner that one end is fixed to the chuck and that a free end corresponds to the reference gauge, and which is a reference of a heat displacement amount of the reference gauge;

a recording means for recording reference image data at a reference temperature, which is obtained by imaging, as a subject, the reference gauge and the free end of the reference body corresponding to the reference gauge in a same imaging area by the imaging means;

a collating means for collating the reference image data, which has been recorded in advance in the recording means, with measured image data at a time of an arbitrary measurement of the subject, which is generated by the imaging means; and

a correcting means for correcting a processing position of a cutting tool based on a collation result by the collating means.

11. The apparatus for correcting the processing position of the cutting machine according to claim 9, wherein the reference body is a material with a different thermal expansion coefficient from that of the material holding the reference gauge.

12. The apparatus for correcting the processing position of the cutting machine according to claim 9, wherein the reference body is a bimetal body.

10. A method for correcting a processing position of a cutting machine, which establishes correspondence between a reference gauge which is arranged on a chuck for holding a workpiece in order to measure a position error of an imaging means, and a reference body which is a reference of a heat displacement amount of the reference gauge and which is arranged in such a manner that one end is fixed to the chuck and that a free end corresponds to the reference gauge;

images, as a subject of the imaging means, the corresponding reference gauge and the corresponding free end of the reference body in a same imaging area in the imaging means;

collates reference image data at a reference temperature, which has been recorded in advance in a recording means, with measured image data at a time of an arbitrary measurement by a collating means; and

corrects a processing position of a cutting tool based on a collation result by the collating means.

13. An imaging apparatus comprising:

an optical path separating means for separating an optical path respectively corresponding to a subject at a different imaging position; and

an image pickup device which is arranged on a same optical path in the optical path separating means,

wherein the optical path separating means blocks an optical path at one imaging position, when imaging the subject at the other imaging position.

14. The imaging apparatus according to claim 13, wherein one of the optical path separating means is a half mirror, and the other is a full mirror.

15. The imaging apparatus according to claim 13, further comprising a shutter for opening the optical path corresponding to the optical path separating means at a time of imaging.

16. The imaging apparatus according to claim 14, wherein an optical path is folded back to the half mirror so as to be of the same length as that of an optical path of the full mirror.

17. The imaging apparatus according to claim 15, comprising:

a mirror chamber for housing the image pickup device and the mirror; and

a shutter chamber for preventing air from flowing into the mirror chamber at a time of opening the shutter,

wherein air is supplied from the mirror chamber to the shutter chamber.

18. A cutting machine comprising an imaging apparatus which images a subject at a different imaging position with a time difference in switching an optical path by the imaging apparatus according to claim 13.

19. A cutting machine comprising:

the imaging apparatus according to claim 13;

a reference gauge which is arranged on a chuck for holding a workpiece in order to measure a position error of the imaging means; and

a reference body which is arranged in such a manner that one end is fixed to the chuck and that a free end corresponds to the reference gauge, and which is a reference of a heat displacement amount of the reference gauge,

wherein the imaging apparatus images, as a subject, the reference gauge and the free end of the reference body corresponding to the reference gauge, at one imaging position in the one optical path, and a cutting tool at the one imaging position, in a same imaging area;

or images, as a subject, the reference gauge and the free end of the reference body corresponding to the reference gauge, at the one imaging position in the one optical path, in a same imaging area, and images a cutting tool at the other imaging position in the other optical path with a time difference in switching an optical path.

20. A cutting machine comprising:

the imaging apparatus according claim 13;

a reference gauge for measuring a position error of the imaging means; and

a reference means which is arranged on a mounting table where a cutting tool is to be mounted, for detecting a displacement amount of a cutting tool and a temperature of the mounting table,

wherein the imaging apparatus uses the reference gauge at the one imaging position in the one optical path as a subject, and the reference means corresponding to the reference gauge or a cutting tool at the other imaging position in the other optical path as a subject; and

images the reference gauge at one imaging position in the one optical path, and images the reference means or the cutting tool at the other imaging position in the other optical path with a time difference in switching an optical path.

21. An imaging apparatus wherein a plurality of image pickup devices are arranged on an optical path respectively corresponding to a subject at a different imaging position.