WO2001022030A1 - Dispositif pour le mesurage geometrique de logements difficilement accessibles dans une piece - Google Patents

Dispositif pour le mesurage geometrique de logements difficilement accessibles dans une piece Download PDF

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Publication number
WO2001022030A1
WO2001022030A1 PCT/EP2000/009299 EP0009299W WO0122030A1 WO 2001022030 A1 WO2001022030 A1 WO 2001022030A1 EP 0009299 W EP0009299 W EP 0009299W WO 0122030 A1 WO0122030 A1 WO 0122030A1
Authority
WO
WIPO (PCT)
Prior art keywords
bore
deflecting mirror
workpiece
sleeve
detection device
Prior art date
Application number
PCT/EP2000/009299
Other languages
German (de)
English (en)
Inventor
Frank Brosette
Mario Schroeder
Original Assignee
Mycrona Gesellschaft Für Innovative Messtechnik Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE29916577U external-priority patent/DE29916577U1/de
Application filed by Mycrona Gesellschaft Für Innovative Messtechnik Gmbh filed Critical Mycrona Gesellschaft Für Innovative Messtechnik Gmbh
Priority to AU75221/00A priority Critical patent/AU7522100A/en
Priority to EP00964226A priority patent/EP1221018A1/fr
Publication of WO2001022030A1 publication Critical patent/WO2001022030A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
    • G01B11/12—Measuring arrangements characterised by the use of optical techniques for measuring diameters internal diameters

Definitions

  • the invention relates to a device for optoelectronic geometry measurement of difficult-to-access cutouts, cavities or bores in a workpiece, in particular for the internal measurement of bores in the wall of a hollow body, such as injection bores in the interior of a fuel injection valve for internal combustion engines.
  • DE 196 11 613 AI discloses a method and a device for measuring bores, in particular injection bores on fuel injection valves for internal combustion engines, in which the object to be measured is clamped in a holding device and measured with a measuring device.
  • the position and geometry of the bore to be measured is determined using an optoelectronic measuring method.
  • the object to be measured is adjusted in a geometrically defined position by means of the recording device before the measuring process, the leading edges and the trailing edges of the bore to be measured being successively measured using an optoelectronic measuring device, such as a CCD camera, during the measuring process.
  • an illumination source such as a light source, is introduced into the interior of the injection valve.
  • the geometric position of the object is converted in the recording device and the measurement results of the optoelectronic measurement method in a connected evaluation unit by means of a corresponding evaluation program into geometric data of the bore to be measured.
  • a camera is provided, the optical axis of which is coaxial with the axis of the bore to be measured.
  • the receiving device for holding the object to be measured is formed by a chuck that can be freely moved in three planes and pivoted about three axes. Light guides are used for lighting, which are inserted into an axial bore of the valve body of the fuel injection valve, from which the injection bore to be measured leads away.
  • this measurement method has
  • the invention has for its object to provide a device of the type mentioned, with the difficult to access holes in workpieces, especially holes in hollow bodies, such as sleeve-like or tubular hollow bodies, in particular small holes located therein with a very small diameter of the inlet bore, exactly and completely can be measured.
  • a device for optoelectronic geometry measurement of recesses, cavities or bores in a workpiece that are difficult to access in particular for the internal measurement of bores in the wall of a hollow body, such as injection bores in the interior of a fuel injection valve for internal combustion engines, with an optoelectronic detection device, if appropriate with a lens, such as a CCD camera, with an illumination source that is located inside or outside the workpiece, for illuminating a location to be imaged inside the recess or the cavity or the bore, and with an evaluation device, with a deflecting mirror that goes into the Recess or the cavity can be placed, which deflects the optical axis of the optoelectronic detection device, a beam of rays emanating from the illumination source being introduced into the optical axis of the detection device and onto the deflecting mirror l is directed from where the beam of rays falls on the location to be imaged inside the recess or the cavity or the bore, such as the inlet
  • a prism is used instead of the deflection mirror.
  • the beam is reflected into the optical axis of the detection device by means of a beam splitter and directed onto the deflection mirror, from where it falls on the location to be imaged or the injection hole, and the reflected beam or diffusely reflected light via the deflection mirror through the beam splitter is steerable into the detection device. Both specular and diffusely reflecting points or locations can be depicted sharply.
  • both the illumination source and the beam splitter which is located away from the lower end of the holder, are arranged on the holder in addition to the deflecting mirror or prism.
  • the deflection mirror and / or the beam splitter can be changed in their geometric position with respect to the holder.
  • the holder is a sleeve which has the deflecting mirror at its lower end facing the workpiece or retractable into the recess or the cavity or the hollow body, above which the beam splitter is located in the area of the other end in the sleeve is located and the sleeve in the area of the deflecting mirror and optionally in the area of the beam splitter has openings for the passage of the beam.
  • the holder can be arranged in at least one of the three spatial directions and, if necessary, rotatable by at least one angle.
  • the workpiece for determining its coordinates is also in a geometrically measurable position and is arranged to be movable and rotatable through at least one angle in at least one of the three spatial directions.
  • both the workpiece and - preferably independently of it - the sleeve are in a geometrically defined position, so that the coordinates of the workpiece and or sleeve can be specified with the measurement. In this way, any location within the workpiece can be measured or mapped.
  • the sleeve is fixedly connected to the optoelectronic detection device, which is located outside the workpiece or the hollow body, by means of a support arm.
  • the sleeve can have a single or multiple kink, with a beam deflection or beam deflection device being located in the area of each kink.
  • This design has the advantage that it can be used for measuring undercuts or can be seen "around the corner" with it.
  • At least one optical system such as a lens, is arranged within the beam path between the deflection mirror and the beam splitter.
  • the bore is irradiated from outside the workpiece or the hollow body at its end opposite the deflecting mirror or the sleeve by means of an illumination source, so that radiation falls through the bore from the outside.
  • the deflecting mirror has at least two deflecting surfaces, which converge in an inverted V-shape, namely ⁇ -shaped, at an angle; this deflecting mirror thus represents a double mirror.
  • a distance can be determined which arises between the two focal points of the two mirror halves.
  • This distance can be changed by moving the optoelectronic detection device, such as a CCD camera, or the lens, so that a cone can be scanned from the inside.
  • the movable units namely camera, lens and workpiece, must be equipped with a measuring device for geometric measurement. The inside of a cone of a workpiece can then be measured by evaluating the measuring positions.
  • the bore can be from outside the workpiece or the
  • Hollow body are irradiated at their end opposite the deflecting mirror or the sleeve by means of an illumination source, so that radiation, in particular visible light, falls through the bore from the outside.
  • Figure 1 is a schematic diagram of the device for displaying the optical
  • FIG. 2 shows a technical embodiment of the device
  • FIG. 3 shows another example of a device for measuring any location within a workpiece with an inner cone, the workpiece, optoelectronic detection device and objective and optionally deflecting mirror being movable relative to one another,
  • Figure 4 shows an example of the device of Figure 3, wherein the deflecting mirror is a double mirror for measuring the inner cone and
  • FIG. 5 shows the example of the device according to Figure 4 to illustrate the
  • a hollow body is shown in section, which here is a fuel injection valve 3, which has bore channels 2, 2 'as injection bores of the fuel injection valve 3, the central axes 19, 19' of which are inclined differently.
  • the bore channel 2 has a lower edge 1 of the bore, also called an inlet bore, which is arranged deep in the region of the lower end of the fuel injection valve 3 due to the position of the injection bore 2.
  • the workpiece 3 can be adjusted in a geometrically defined position by means of a holding device (not shown), wherein the geometric position of the workpiece 3 can be changed in a predeterminable manner that can be evaluated by measurement technology.
  • a deflection mirror 4 is inserted into the lower end thereof, which is used to measure the inlet bore 1 of the injection channel 2 the inlet hole 1 is positioned.
  • the deflecting mirror 4 can be a surface deflecting mirror or a prism.
  • Light from an illumination source 10 outside the fuel injection valve 3 is directed onto the deflection mirror 4 via an arranged beam splitter 11, which is preferably located outside the fuel injection valve 3 and is located between an optoelectronic detection device 5 and the deflection mirror 4, so that the beam from the illumination source 10, delimited by edge rays 6 of the beam path, onto which deflecting mirror 4 falls.
  • the deflecting mirror 4 is aligned such that the beam path preferably falls perpendicularly onto the wall 7 of the fuel injection valve 3 and thus onto the inlet bore 1.
  • the radiation preferably light from the illumination source 10
  • the detection device 5 is located behind the beam splitter 11. The light reflected or diffusely scattered back from the measurement point or from the surface of the measurement point is fed to the detection device 5 via the deflection mirror 4.
  • Figure 2 shows a technical embodiment of the device, consisting of a tubular, elongated-narrow sleeve 13 or tube, which dips with its tip into the inner bore 20 of the fuel injector 3.
  • the deflection mirror 4 is located within the lower, immersed end of the sleeve 13 or the tube 13, the sleeve 13 having an opening 15 at the lower end for the passage of the beam 6 from the light source 10.
  • the jet is expensive 11 inclined, which is installed in the tube 13.
  • the wall of the sleeve 13 has a further opening 14 for the passage of light from the light source 10.
  • the sleeve 13 is fixedly connected to the optoelectronic detection device 5 by means of a support arm 16, so that the detection device 5, the support arm 16 and the Sleeve 13, and thus the beam splitter 11 and the deflecting mirror 4, form a unit, which can move in the three spatial axes and can also be swiveled if necessary.
  • a further optical system can be arranged inside the sleeve 13 or the tube 13, consisting, for example, of lenses 17, 18.
  • the workpiece 3 is correspondingly rotated about its central axis 8, which in the example of FIG. 2 coincides with the optical axis 12 of the detection device 5 until the respective inlet bore is detected by the beam path 6.
  • the different spatial position of the inlet bores 1 of the bore channels 2, 2 'in FIG. 2 and thus their different geometric representation in the image plane of the detection device 5 can be converted using a computer program in order to determine the exact cross sections of the inlet bores in this way.
  • FIGS. 3 to 5 show further examples of the device for measuring any location within a workpiece 21 and for measuring inner cones 22 of a workpiece 21.
  • the workpiece 21 has an inner cone 22, into which the mirror 4, which is attached to a holder, not shown, is inserted.
  • the measuring arrangement also includes the optoelectronic detection device, such as a CCD camera 5, the beam splitter 11 and a lens 17, which focuses a selected point 23 or location 23 on the inner surface 22 of the inner cone.
  • the workpiece 21, the lens 17 and the CCD camera 5 are each equipped with a measuring device 24, 24 ', 24 "for determining coordinates, so that when moving the workpiece 21, lens 17 and possibly the CCD camera 5 further locations or Points can be imaged sharply on the inner conical surface 22.
  • the double arrows indicate the main direction of movement in the z-axis direction, although it is possible to move and pivot in all coordinate directions and solid angles.
  • a double mirror 26 is used, as shown in FIGS. 4 and 5, a distance s and s' can be determined.
  • the distance s is the mutual distance between the two focus points 25, 25 'on the inner surface 22 of the inner cone of the workpiece 21.
  • the double mirror 26 has the two mirror surfaces 27, 27', which are reversely V-shaped at an angle with respect to the Lens 17 converge inclined, the upper common edge facing lens 17, as can be seen from FIGS. 4 and 5.
  • the distance between the two focus points can be changed by moving either the CCD camera 5 or the lens 17 or, if appropriate, the workpiece 21, which can be seen from FIG. 5.
  • the movable units such as workpiece, lens and CCD camera, have measuring devices 24, 24 ', 24 "(FIG. 3).
  • the inner cone 22 can be measured by evaluating the measuring positions, so that the cone opening angle ⁇ can also be determined ,
  • the invention can be used, for example, for the geometry measurement of recesses, cavities or bores in a workpiece that are difficult to access, in particular for the internal measurement of bores in a hollow body, such as injection bores in the interior of a fuel injection valve for internal combustion engines.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne un dispositif pour le mesurage géométrique optoélectronique de logements, espaces creux ou perçages difficilement accessibles (2, 2') dans une pièce (3), en particulier pour le mesurage intérieur de perçages (2, 2') dans un corps creux (3), tels que des orifices d'injection (2, 2') ménagés dans une vanne d'injection de carburant (3) pour moteurs à combustion interne. Le dispositif selon l'invention comprend un dispositif de détection optoélectronique (5), le cas échéant un objectif tel que caméra CCD, une source d'éclairage (10) située à l'intérieur ou à l'extérieur de la pièce (3), pour l'éclairage d'un emplacement à reproduire à l'intérieur du logement ou de l'espace creux ou du perçage, ainsi qu'un dispositif d'évaluation. Un miroir de réflexion (4, 26) pouvant être placé dans le logement ou dans l'espace creux modifie la direction de l'axe optique (12) du dispositif de détection optoélectronique (5). Un faisceau (6) provenant de la source d'éclairage (10) est amené dans l'axe optique (12) du dispositif de détection (5) et est dirigé sur le miroir de réflexion (4) d'où le faisceau (6) vient frapper l'emplacement à reproduire, à l'intérieur du logement ou de l'espace creux ou du perçage, tel que l'orifice d'introduction (1) ou l'orifice d'injection (2, 2'). Le faisceau réfléchi est dévié par le miroir de réflexion (4), dans le dispositif de détection (5), le miroir de réflexion (4) étant disposé à l'extrémité inférieure d'un support (13) déplaçable au moins en hauteur.
PCT/EP2000/009299 1999-09-22 2000-09-22 Dispositif pour le mesurage geometrique de logements difficilement accessibles dans une piece WO2001022030A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU75221/00A AU7522100A (en) 1999-09-22 2000-09-22 Device for geometric determination of poorly accessible hollows in one workpiece
EP00964226A EP1221018A1 (fr) 1999-09-22 2000-09-22 Dispositif pour le mesurage geometrique de logements difficilement accessibles dans une piece

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE29916577U DE29916577U1 (de) 1999-09-22 1999-09-22 Vorrichtung zum Vermessen von Einspritzbohrungen an Kraftstoffeinspritzventilen für Brennkraftmaschinen
DE29916577.9 1999-09-22
DE10009946A DE10009946A1 (de) 1999-09-22 2000-03-02 Vorrichtung zum Vermessen von Bohrungen
DE10009946.7 2000-03-02

Publications (1)

Publication Number Publication Date
WO2001022030A1 true WO2001022030A1 (fr) 2001-03-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/009299 WO2001022030A1 (fr) 1999-09-22 2000-09-22 Dispositif pour le mesurage geometrique de logements difficilement accessibles dans une piece

Country Status (3)

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EP (1) EP1221018A1 (fr)
AU (1) AU7522100A (fr)
WO (1) WO2001022030A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7625335B2 (en) 2000-08-25 2009-12-01 3Shape Aps Method and apparatus for three-dimensional optical scanning of interior surfaces
US8032337B2 (en) 2001-03-02 2011-10-04 3Shape A/S Method for modeling customized earpieces
CN109612397A (zh) * 2018-12-04 2019-04-12 四川凌峰航空液压机械有限公司 轴套类排列斜孔边距的测检方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2301837A1 (fr) * 1975-02-21 1976-09-17 Matra Engins Appareil d'observation et/ou de mesure de dimensions d'une cavite presentant une ouverture
DE3903000A1 (de) * 1989-02-02 1990-08-09 Mainz Gmbh Feinmech Werke Verfahren zum vermessen des innendurchmessers und der formabweichung von kleinen bohrungen und vorrichtung zu seiner durchfuehrung
DE4415582A1 (de) * 1994-05-04 1995-11-09 Autec Gmbh Vorrichtung zur optischen Abstandsmessung an Innenwänden durch Einführung eines Meßkopfes
WO1997032182A1 (fr) * 1996-02-27 1997-09-04 Massachusetts Institute Of Technology Procede et appareil permettant d'effectuer des mesures optiques a l'aide d'un endoscope, un catheter ou un fil de guidage d'imagerie a fibre optique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2301837A1 (fr) * 1975-02-21 1976-09-17 Matra Engins Appareil d'observation et/ou de mesure de dimensions d'une cavite presentant une ouverture
DE3903000A1 (de) * 1989-02-02 1990-08-09 Mainz Gmbh Feinmech Werke Verfahren zum vermessen des innendurchmessers und der formabweichung von kleinen bohrungen und vorrichtung zu seiner durchfuehrung
DE4415582A1 (de) * 1994-05-04 1995-11-09 Autec Gmbh Vorrichtung zur optischen Abstandsmessung an Innenwänden durch Einführung eines Meßkopfes
WO1997032182A1 (fr) * 1996-02-27 1997-09-04 Massachusetts Institute Of Technology Procede et appareil permettant d'effectuer des mesures optiques a l'aide d'un endoscope, un catheter ou un fil de guidage d'imagerie a fibre optique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7625335B2 (en) 2000-08-25 2009-12-01 3Shape Aps Method and apparatus for three-dimensional optical scanning of interior surfaces
US8032337B2 (en) 2001-03-02 2011-10-04 3Shape A/S Method for modeling customized earpieces
CN109612397A (zh) * 2018-12-04 2019-04-12 四川凌峰航空液压机械有限公司 轴套类排列斜孔边距的测检方法

Also Published As

Publication number Publication date
EP1221018A1 (fr) 2002-07-10
AU7522100A (en) 2001-04-24

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