WO2020016468A1 - Rugosimètre sans contact et méthode de mesure de la rugosité - Google Patents

Rugosimètre sans contact et méthode de mesure de la rugosité Download PDF

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Publication number
WO2020016468A1
WO2020016468A1 PCT/ES2019/070476 ES2019070476W WO2020016468A1 WO 2020016468 A1 WO2020016468 A1 WO 2020016468A1 ES 2019070476 W ES2019070476 W ES 2019070476W WO 2020016468 A1 WO2020016468 A1 WO 2020016468A1
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WO
WIPO (PCT)
Prior art keywords
roughness
brightness
electromagnetic radiation
emitter
cone
Prior art date
Application number
PCT/ES2019/070476
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English (en)
Spanish (es)
Inventor
Asier Miguel ELEJOSTE GONZÁLEZ
Original Assignee
Elejoste Gonzalez Asier Miguel
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 Elejoste Gonzalez Asier Miguel filed Critical Elejoste Gonzalez Asier Miguel
Publication of WO2020016468A1 publication Critical patent/WO2020016468A1/fr

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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
    • G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
    • G01B11/303—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces using photoelectric detection means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity

Definitions

  • roughness is the set of irregularities that a surface possesses and roughness meters are high precision measuring instruments that are used to measure such irregularities or imperfections on surfaces.
  • the object of the present description is an improved method for measuring surface roughness, without making any contact on it and the roughness meter that is capable of applying said method.
  • Roughness meters are used to determine the roughness of these surfaces by indicating the depth of the average roughness (Rz) which is the distance between the maximum height and the minimum measured height of irregularities or imperfections of a length and the value of the arithmetic average roughness ( Ra), which is the average roughness of all the measures that the equipment has been acquiring, or what is the same is the average value of the measured roughness of a given surface for verification.
  • Rz the depth of the average roughness
  • Ra arithmetic average roughness
  • Roughness meters can be classified according to their type of palpation, and can be contact or no contact.
  • the contact ones have a probe that is usually based on a diamond tip whose function is to take the data by scanning the tip on the piece, and the non-contact ones are those that analyze the surface of the material without making any type of rubbing on her.
  • the result of this roughness measurement is the visualization of a profile, being able to observe in two dimensions the distance traveled by the rugosimeter on the surface and the peaks and valleys that it presents.
  • the probe is moved on the surface manually by the user, causing more decalibrations and generating results that may be inaccurate.
  • probes are used that move autonomously through the surface or that are fixed to a support so that the piece is moved, depending on the manufacturing process or the machine to which it is fixed. In these cases, the vibrations that generate the displacement of the parts can affect the measurement.
  • the non-contact ones do not have a physical probe, so that instead of using a needle or measuring tip that is dragged on the surface, a laser beam of different wavelengths that affect the surface to be measured.
  • roughness meters are characterized in carrying out the measurements at a higher speed when working with high sensitivity photoelectric sensors and in checking the general measurements of the parts, in addition to the roughnesses. That is, they have more than one use, unlike contact roughness meters.
  • the invention ES2337323A1 describes a roughness meter for measuring the roughness of a surface comprising a laser sensor for measuring a distance from the roughness meter to the surface to be measured.
  • the laser sensor is based on the triangulation of the light beam, preferably comprising a laser beam generator and a sensitive position sensor of the reflected laser beam that generates two electrical currents proportional to the distance of the incident point beam reflected in the detector with respect to The ends of the detector.
  • the present invention has been developed to be used in all these mentioned industries, with a quality level, according to the existing requirements.
  • the present invention comprises the execution of the measurement of the roughness of a surface and the rugosimeter apparatus, used to carry out said measurement.
  • the invention aims at a non-contact roughness meter and the method carried out for the measurement of roughness on a surface.
  • Said roughness meter comprises an emitter configured to emit a beam of electromagnetic radiation on the surface to be measured roughness, a collimator configured to homogenize the electromagnetic radiation beams, emitted by the emitter, obtaining a set of parallel beams with the same intensity properties of brightness, a receiver, configured to receive the reflection of the beam of electromagnetic radiation on the surface to measure the roughness that has been emitted by the emitter and a processing unit, where the brightness intensity values received by the receiver are compared with a database of brightness intensities associated with roughnesses and where once the brightness intensity values received by the receiver have been compared with the database of the processing unit, the roughness value associated with these intensity intensity values is selected reflected beam brightness.
  • the beam of electromagnetic radiation emitted by the emitter comprises a very wide wavelength range comprising white light, monochromatic light, infrared light, ultraviolet light and the laser beam.
  • the receiver that receives the reflected beam is formed by a group of photometers based on a matrix of light sensors that measure the reflection of light in number of beams.
  • the method of the present invention consists in the use of the properties of light reflection, on a surface, to infer the character of the surface finish of the materials, roughness and undulations, without the need for physical contact between the measuring device and the surface to be measured
  • the method is based on the measurement of the intensity of the brightness of the beam of electromagnetic radiation once it has been reflected by said surface to be measured. Specifically, when a beam of electromagnetic radiation is reflected on a surface, it tends to disperse depending on the roughness of said surface, so that if the roughness is very high, the dispersion is greater.
  • the reflected electromagnetic radiation beam loses brightness intensity as its dispersion is greater, that is, as the electromagnetic radiation beams lose their parallelism with which they were emitted.
  • the more electromagnetic radiation beams reach the receiver the more intensity of brightness has been reflected, which means that the surface has little roughness, while, if the roughness of the piece to be measured is greater, the beams deviate and they disperse so the brightness intensity that reaches the receiver is lower.
  • the method described in the present invention for measuring roughness consists in measuring the brightness and intensity of a beam reflected on a beam surface on which said beam is affected. To do this, the more parallel rays are reflected and captured by the sensors, the more intensity of brightness exists, so that if the roughness in the piece to be measured is greater, the rays are deflected and the intensity of brightness that reaches the sensors Receiving the electromagnetic radiation beam is smaller.
  • the roughness reading method is a process that has the following stages:
  • the contactless roughness meter allows to measure the reflection of the light intensity of a material and compare it with the known roughness depending on the light intensity of said material, to be able to show it. That is, based on said brightness intensity of said reflection, the surface roughness is determined.
  • the emitter, the receiver and the rugosimeter collimator are comprised in a cone installed in a machine tool, being connected to the processing unit comparing the brightness intensity of the beam of electromagnetic radiation reflected and received by the receiver with the rugosimeter database and displays by means of an output device, the roughness data obtained.
  • the cone comprises a transmitting antenna that wirelessly connects said cone to the processing unit, by means of a wireless connection that can be bluetooth, a Wi-Fi or infrared signal, while in another embodiment, the cone is connected to the unit of Processing via a wired connection.
  • the roughness meter data output device is a screen showing the maximum and average roughnesses as well as the sample length of the measured surface.
  • the cone is mounted on a robotic arm configured to position the emitter and receiver of the electromagnetic radiation beam in a position suitable for performing the roughness measurement of the surfaces to be measured, of a piece, during the process of manufacturing and checking said piece.
  • the robotic arm can rotate and move to obtain the necessary sample length on the surface of the piece, or remain motionless, the piece being the one that moves or rotates, achieving the scanning of the beam of electromagnetic radiation on its surface.
  • the cone is mounted on a device configured to be used manually by a user to perform measurements in both manufacturing processes and subsequent checks, at the micrometer level but without the need to have contact with the surface of the object to measure.
  • the application of this invention is linked to any sector that depends on machining processes, and can also be applied to other surface processes such as painting, polishing or chrome plating, as well as to all those cases in which it is necessary to know the smoothness of a surface.
  • Figure 5 shows a preferred assembly of part of the roughness meter in an ISO cone, for use in a machining center.
  • the present invention comprises the process of measuring the roughness of a surface and of the apparatus, non-contact roughness meter, which performs said measurement.
  • This piece measurement can be done before, during or after machining, depending on the needs, as well as in preventive or predictive work such as, for example, to verify elements or machinery in operation such as the roughness of injection molds.
  • the operation of the rugosimeter consists in the emission of a beam of electromagnetic radiation by an emitter (2) on a surface of which it is desired to know the roughness.
  • the electromagnetic radiation beam passes through a collimator, with which a set of parallel beams with the same brightness intensity properties are obtained.
  • This set of beams are reflected on said surface and the reflection is captured by the receiver (3), which is formed by a group of photometers that measure the intensity of the light.
  • Figure 5 shows an embodiment of part of the rugosimeter installed in a cone (4), configured to be used in a machining center, so that it can be mounted on a robotic arm allowing its positioning in a programmed way as if A three-dimensional measuring machine is treated, although it can also be mounted on a device configured to be used manually.
  • the cone (4) has two small projections, one of them being the emitter (2) or focus of the beam of electromagnetic radiation and the other the receiver (3).
  • This cone (4) is connected to a processing unit that is the part of the roughness meter where the brightness intensity values received by the receiver (3) are compared with a database of brightness intensities associated with different roughnesses of different materials , and the output device of the roughness data.
  • the data obtained in the measurement, after being compared with those recorded in the database, are shown to the user by means of an output device of the roughness data of the measured surfaces.
  • connection between the cone (4) and the processing unit can be made wirelessly or by cable.
  • the cone (4) has a transmitting antenna (1) with which both devices communicate.
  • the arrows represent the beams coming out of the emitter (2) and bounce on the surface, but not all the projected beams return until the receiver (3), since they depend on the surface finish, returning more or less beams, this value being the one that provides the roughness of the surface to be measured.

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

Abstract

La présente invention concerne un rugosimètre capable de mesurer la rugosité d'une surface sur laquelle il n'est pas en contact, lequel rugosimèptre comprend un émetteur (2) configuré pour émettre un faisceau de rayonnement électromagnétique sur la surface dont on veut mesurer la rugosité, un collimateur configuré pour homogénéiser les faisceaux de rayonnement électromagnétique, émis par l'émetteur (2) formant un ensemble de faisceaux parallèles ayant les mêmes propriétés d'intensité de brillance et un récepteur (3), configuré pour recevoir la réflexion du faisceau de rayonnement électromagnétique sur la surface dont on veut mesurer la rugosité, qui a été émis par l'émetteur (2). Ces éléments formant le rugosimètre sont complétés par une unité de traitement configurée pour comparer les valeurs d'intensité de brillance reçues par le récepteur (3) à une base de données d'intensités de brillance associées à des rugosités de différents matériaux et pour sélectionner la valeur de la rugosité associée aux valeurs d'intensité de brillance du faisceau reflété, une fois que les valeurs d'intensité de brillance reçues par le récepteur (3) ont été comparées à la base de données de l'unité de traitement.
PCT/ES2019/070476 2018-07-18 2019-07-05 Rugosimètre sans contact et méthode de mesure de la rugosité WO2020016468A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201830725A ES2738204A1 (es) 2018-07-18 2018-07-18 Rugosimetro sin contacto y metodo para la medicion de rugosidad
ESP201830725 2018-07-18

Publications (1)

Publication Number Publication Date
WO2020016468A1 true WO2020016468A1 (fr) 2020-01-23

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ES (1) ES2738204A1 (fr)
WO (1) WO2020016468A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804521A (en) * 1972-02-22 1974-04-16 Itek Corp Optical device for measuring surface roughness
JPS6491009A (en) * 1987-10-02 1989-04-10 Hitachi Ltd Apparatus for evaluating flatness of thin film
JPH11287639A (ja) * 1998-03-31 1999-10-19 Sumitomo Osaka Cement Co Ltd 光学式表面粗さ両面検査方法およびその装置
WO2001026861A1 (fr) * 1999-10-12 2001-04-19 Seco Tools Ab; (Publ) Dispositif d'une machine-outil
WO2016015734A1 (fr) * 2014-08-01 2016-02-04 Dfm A/S Appareil de diffusomètre
US20170082536A1 (en) * 2015-08-12 2017-03-23 Industrial Technology Research Institute Scattering measurement system and method
JP2018044873A (ja) * 2016-09-15 2018-03-22 日立オートモティブシステムズ株式会社 表面検査装置、表面検査方法及びデータベース
US20180147645A1 (en) * 2016-11-26 2018-05-31 Agie Charmilles Sa Method for machining and inspecting of workpieces

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1014638A (fr) * 1974-04-16 1977-07-26 Domtar Limited Determination de la rugosite d'une feuille en mouvement
US5162660A (en) * 1991-06-27 1992-11-10 Macmillan Bloedel Limited Paper roughness or glass sensor using polarized light reflection
US5189490A (en) * 1991-09-27 1993-02-23 University Of Hartford Method and apparatus for surface roughness measurement using laser diffraction pattern
FI991071A0 (fi) * 1999-05-10 1999-05-10 Valmet Automation Inc Menetelmä ja mittausjärjestely mitata paperin pintaa

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804521A (en) * 1972-02-22 1974-04-16 Itek Corp Optical device for measuring surface roughness
JPS6491009A (en) * 1987-10-02 1989-04-10 Hitachi Ltd Apparatus for evaluating flatness of thin film
JPH11287639A (ja) * 1998-03-31 1999-10-19 Sumitomo Osaka Cement Co Ltd 光学式表面粗さ両面検査方法およびその装置
WO2001026861A1 (fr) * 1999-10-12 2001-04-19 Seco Tools Ab; (Publ) Dispositif d'une machine-outil
WO2016015734A1 (fr) * 2014-08-01 2016-02-04 Dfm A/S Appareil de diffusomètre
US20170082536A1 (en) * 2015-08-12 2017-03-23 Industrial Technology Research Institute Scattering measurement system and method
JP2018044873A (ja) * 2016-09-15 2018-03-22 日立オートモティブシステムズ株式会社 表面検査装置、表面検査方法及びデータベース
US20180147645A1 (en) * 2016-11-26 2018-05-31 Agie Charmilles Sa Method for machining and inspecting of workpieces

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Publication number Publication date
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