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WO2001033167A1 - Procede et dispositif pour detecter des irregularites superficielles - Google Patents

Procede et dispositif pour detecter des irregularites superficielles Download PDF

Info

Publication number
WO2001033167A1
WO2001033167A1 PCT/DE2000/003671 DE0003671W WO0133167A1 WO 2001033167 A1 WO2001033167 A1 WO 2001033167A1 DE 0003671 W DE0003671 W DE 0003671W WO 0133167 A1 WO0133167 A1 WO 0133167A1
Authority
WO
WIPO (PCT)
Prior art keywords
examined
sound
gas flow
sound level
measurement
Prior art date
Application number
PCT/DE2000/003671
Other languages
German (de)
English (en)
Inventor
Joachim Frangen
Original Assignee
Robert Bosch 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
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2001033167A1 publication Critical patent/WO2001033167A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B13/00—Measuring arrangements characterised by the use of fluids
    • G01B13/22—Measuring arrangements characterised by the use of fluids for measuring roughness or irregularity of surfaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
    • G01B17/08—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring roughness or irregularity of surfaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/26—Scanned objects
    • G01N2291/263—Surfaces
    • G01N2291/2632—Surfaces flat

Definitions

  • the invention relates to a method and a device for detecting irregularities in the topography of surfaces on objects.
  • Optical / analysis methods are also used, e.g. B. the scattered light analysis or the strip light analysis.
  • these analysis methods are only successful with homogeneous optical properties (brightness, color, gloss, transparency, shape) of the surfaces to be examined.
  • a high-voltage test is used as a further analysis method, but is only suitable for non-conductive materials and with which defects can be found in the form of continuous cracks or holes.
  • Leak test methods are also suitable for finding continuous cracks and / or holes, but only on special component geometries.
  • the invention is based on the object of providing an analysis method with which in particular the smallest edge-shaped irregularities on surfaces of Let objects be found safely and without contact.
  • a gas flow that is as low as possible in swirl ie. H. preferably laminar gas flow is directed onto the surface to be examined, and that the sound level when the gas flow interacts with the surface to be examined as a measure of irregularities, e.g. B. in the form of angular surface defects or edges in the surface is evaluated.
  • This procedure elegantly exploits the knowledge that a gas flow that is as swirl-free as possible, preferably laminar, flowing onto an edge-free surface is essentially silent.
  • an increased noise level can be determined.
  • Vortexes in the flow are generated by the smallest pores or cracks in the surface to be detected. The associated sound development can be measured safely and easily.
  • the gas flow is oriented essentially perpendicular to the surface to be examined.
  • the measurement is carried out at different gas flow angles to the surface.
  • the gas flow can be moved in relation to the surface to be examined.
  • the gas flow will flow essentially laminar and therefore silently.
  • the laminar flow is disturbed, it becomes turbulent. This effect then becomes noticeable as an abrupt noise.
  • the sound level is recorded depending on the impact of the gas stream on the surface by an evaluation system, by means of which a sound level map can be generated, in which the sound level is preferably visual, e.g. B. are represented by appropriate coloring.
  • an ambient sound level be recorded separately and taken into account when evaluating a measurement sound level in order to reduce the effects of external noise.
  • the ambient sound level is preferably subtracted from the measurement sound level.
  • the main idea of the invention is that a device is provided for generating a low-vortex gas stream aligned with the surface to be examined, and that sensor means for sound detection are present which measure the sound level due to the interaction of gas stream and Surface as a measure of irregularities, e.g. B. in the form of angular surface defects or edges in the surface.
  • a gas nozzle is preferably used to generate a low-vortex gas stream.
  • the gas nozzle consists at least partially of glass, in particular in the region of the Gas outlet. This takes advantage of the effect that glass has a particularly smooth surface that counteracts eddy formation.
  • At least one microphone be used for sound measurement.
  • means for structure-borne noise measurement can also be used.
  • means are provided for external noise shielding of the sensor means and / or for sound guidance.
  • a tube is directed at the area of the surface that is exposed to the flow, and is used to direct any flow noise that may arise to a microphone.
  • the microphone is shielded from the outside by the pipe walls, so that external noise from the surroundings can be shielded.
  • the tube preferably tapers from the microphone in the direction of the sound inlet opening in order to increase the shielding effect.
  • the device for generating a low-vortex gas stream and the surface to be examined can be aligned with one another.
  • a gas nozzle can be arranged on a freely positionable robot arm. In this way, a comprehensive analysis of a surface to be examined, for example computer-controlled, can be carried out.
  • a unit for amplifying the signal from the sensor means for sound measurement is preferably provided.
  • the measurement signal can then be further processed in a simple manner, for example on a headphone or a Give spectrum analyzer.
  • an evaluation system automatically generates a quality statement about the condition of the examined surface according to a defined method or algorithm, possibly including further sensor signals and information. This measure allows rationally checking large numbers of objects to be examined.
  • Fig. 1 shows a schematic representation of a device for detecting angular irregularities in the surface topography of an object
  • Fig. 2 is a principle
  • Block diagram of an electronic evaluation unit for a sound sensor which is used in a device according to FIG. 1.
  • the device for the detection of angular irregularities in the topography of surfaces comprises a gas nozzle 1 made of preferably drawn glass with an outlet opening 2 after a strongly tapered one Area of the nozzle. If the nozzle 1, indicated by arrow 3, is preferably pressurized with compressed air, an essentially vortex-free gas stream flows out of the gas outlet opening 2 through arrow 4 and strikes the surface of a workpiece 5 at a point of impact 18. Starting from the point of impact 18, the gas flows radially across the surface. With a suitable gas pressure and a distance between the outlet opening 2 and the surface 6 of the workpiece 5, the gas flow flows largely in a vortex-free and silent manner. To detect a sound level that could result from the interaction of the gas flow with the surface 6 of the workpiece 5, a microphone 7 is provided, which is arranged at the end of a measuring tube 8.
  • the measuring tube 8 with its opening 9, as shown by way of example in FIG. 1, is preferably aligned with the area of the surface 6 in which the radial gas flow slides over the surface.
  • the measuring tube is directed at the impact point 18.
  • the microphone 7 will not detect any flow noises.
  • the nozzle During the surface inspection, the nozzle is moved over the surface of the workpiece. As soon as the impact point 18 comes in the vicinity of a crack 10 present in the surface 6, the edges of the crack induce vortices in the gas stream, as a result of which noise is abruptly generated, which is detected by the microphone 7. As shown in FIG. 2, the microphone 7 transmits an electrical signal via the measuring lines 11, 12 to an amplifier 13. From there, the amplified signal z. B. be forwarded to a headphone 14 or a spectrum analyzer 15. However, the signal can also be processed in a filter unit 16 in order to then increase the sound level measured value to output a display unit 17.
  • the nozzle can also have a slot-shaped, also curved, outlet opening.
  • microphones can be used to detect directional sound intensities.
  • the surface of a workpiece can also be flowed at at different angles, an evaluation preferably taking place for each angular position.
  • the method according to the invention can be combined with known methods to increase detection reliability.
  • the nozzle 1 is at a distance of 0.5-3 mm from the surface 6 with a diameter of
  • Gas outlet opening 2 of approx. 100 ⁇ m. It has been shown that if the distance between the gas nozzle and the surface to be examined is too great, a gas stream which initially emerges in a laminar manner becomes turbulent without surface irregularities and thus generates an intensive background noise. That is, although a high tolerance to fluctuations in the distance of the gas nozzle 1 from the surface of a workpiece should be adhered to a certain "distance corridor".
  • the method according to the invention provides a non-contact and non-destructive analysis method for surface irregularities, which can be implemented with a simple and inexpensive analysis setup. Furthermore, such an analysis device delivers an easily interpretable measurement signal, with extraordinarily high Sensitivities with regard to defect sizes can be achieved. It has been found that
  • the method is not only largely insensitive to distance fluctuations between the nozzle and the workpiece surface, but also with regard to the optical, electrical or magnetic surface properties of the workpiece.
  • the process can be used with different materials such as plastic, metal, glass, ceramic without any problems.
  • impurities on the workpiece surface are removed by the gas flow, which at the same time achieves a cleaning effect.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un procédé permettant de détecter des irrégularités, telles que des fissures, des arêtes, des pores ou similaires dans la topographie de surfaces d'objets. Selon ce procédé, un flux gazeux à tourbillonnement réduit est dirigé sur la surface à examiner. Le niveau sonore résultant de l'interaction entre le flux gazeux et la surface (6) est évalué comme mesure pour les défauts superficiels ou les arêtes figurant dans la surface. L'invention concerne en outre un dispositif permettant de mettre ledit procédé en oeuvre.
PCT/DE2000/003671 1999-10-29 2000-10-19 Procede et dispositif pour detecter des irregularites superficielles WO2001033167A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999152454 DE19952454A1 (de) 1999-10-29 1999-10-29 Verfahren und Vorrichtung zum Detektieren von Oberflächenunregelmäßigkeiten
DE19952454.8 1999-10-29

Publications (1)

Publication Number Publication Date
WO2001033167A1 true WO2001033167A1 (fr) 2001-05-10

Family

ID=7927499

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/003671 WO2001033167A1 (fr) 1999-10-29 2000-10-19 Procede et dispositif pour detecter des irregularites superficielles

Country Status (2)

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DE (1) DE19952454A1 (fr)
WO (1) WO2001033167A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009077018A1 (fr) * 2007-12-19 2009-06-25 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Procédé pour déterminer la taille et/ou l'état d'une ouverture de buse
WO2016168877A1 (fr) * 2015-04-23 2016-10-27 Framag Industrieanlagenbau Gmbh Dispositif de surveillance de buses
WO2020007574A1 (fr) * 2018-07-06 2020-01-09 Siemens Aktiengesellschaft Agencement et procédé pour la surveillance de surfaces externes d'un dispositif à haute tension

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021204438A1 (de) 2021-05-03 2022-11-03 Friedrich-Alexander-Universität Erlangen-Nürnberg Verfahren und Vorrichtung zur Erkennung, Prüfung und/oder Vermessung eines Objekts

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3720311A (en) * 1971-01-26 1973-03-13 Molins Machine Co Inc Method and apparatus for detecting loose ends and missing filters in cigarettes
JPS6047909A (ja) * 1983-08-25 1985-03-15 Ryoichi Ichinomiya 音響を利用して変化する位置及び寸法を測定する方法
JPS61114117A (ja) * 1984-11-09 1986-05-31 Hitachi Ltd 微小穴の深さ計測装置
US5031156A (en) * 1986-06-20 1991-07-09 Eds Technologies, Inc. Method and apparatus for detecting and counting articles
EP0729008A1 (fr) * 1993-06-15 1996-08-28 University Of East London Application et méthode pour détecter des changements en distance
WO1998030870A1 (fr) * 1997-01-10 1998-07-16 Simonne De Rijck Systeme de detection visant a detecter la qualite de la surface de brosses

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701644A1 (de) * 1997-01-18 1998-07-23 Heidelberger Druckmasch Ag Einrichtung zur Steuerung der Bogenzufuhr zu einer drucktechnischen Maschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3720311A (en) * 1971-01-26 1973-03-13 Molins Machine Co Inc Method and apparatus for detecting loose ends and missing filters in cigarettes
JPS6047909A (ja) * 1983-08-25 1985-03-15 Ryoichi Ichinomiya 音響を利用して変化する位置及び寸法を測定する方法
JPS61114117A (ja) * 1984-11-09 1986-05-31 Hitachi Ltd 微小穴の深さ計測装置
US5031156A (en) * 1986-06-20 1991-07-09 Eds Technologies, Inc. Method and apparatus for detecting and counting articles
EP0729008A1 (fr) * 1993-06-15 1996-08-28 University Of East London Application et méthode pour détecter des changements en distance
WO1998030870A1 (fr) * 1997-01-10 1998-07-16 Simonne De Rijck Systeme de detection visant a detecter la qualite de la surface de brosses

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 170 (P - 373) 16 July 1985 (1985-07-16) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 298 (P - 505) 9 October 1986 (1986-10-09) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009077018A1 (fr) * 2007-12-19 2009-06-25 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Procédé pour déterminer la taille et/ou l'état d'une ouverture de buse
WO2016168877A1 (fr) * 2015-04-23 2016-10-27 Framag Industrieanlagenbau Gmbh Dispositif de surveillance de buses
WO2020007574A1 (fr) * 2018-07-06 2020-01-09 Siemens Aktiengesellschaft Agencement et procédé pour la surveillance de surfaces externes d'un dispositif à haute tension

Also Published As

Publication number Publication date
DE19952454A1 (de) 2001-05-23

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