EP2834629A1 - Procédé d'étalonnage d'un dispositif de mesure destiné à l'inspection de surfaces, basé sur le bruit barkhausen pour une géométrie de pièce prédéterminée - Google Patents

Procédé d'étalonnage d'un dispositif de mesure destiné à l'inspection de surfaces, basé sur le bruit barkhausen pour une géométrie de pièce prédéterminée

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Publication number
EP2834629A1
EP2834629A1 EP13709821.6A EP13709821A EP2834629A1 EP 2834629 A1 EP2834629 A1 EP 2834629A1 EP 13709821 A EP13709821 A EP 13709821A EP 2834629 A1 EP2834629 A1 EP 2834629A1
Authority
EP
European Patent Office
Prior art keywords
component
barkhausen noise
surface hardness
measuring device
calibration curve
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP13709821.6A
Other languages
German (de)
English (en)
Inventor
Oliver Bleicher
Herman Yakaria
Yiwen Xu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP2834629A1 publication Critical patent/EP2834629A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/725—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables by using magneto-acoustical effects or the Barkhausen effect
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/80—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating mechanical hardness, e.g. by investigating saturation or remanence of ferromagnetic material

Definitions

  • the invention relates to a method for calibrating a measuring device for surface inspection based on Barkhausen noise for a predetermined component geometry and a corresponding measuring device.
  • damage may occur in the context of surface treatment.
  • a common form of surface damage is so-called grinding burn, e.g. may occur during tooth grinding for generating the final contour of toothed components.
  • chemical etching processes are known from the prior art.
  • Nital beauens the component to be tested is treated with various acids and alkalis, which after the treatment on color changes to the component surface damage and especially grinding burn is recognizable.
  • the Nitaliseren is on the one hand environmentally unfriendly and on the other hand causes very high costs for the maintenance and disposal of the acids and alkalis used.
  • it is a subjective test method in which the surface damage is assessed by discoloration by human experts. Nital etching is therefore not suitable for testing the surfaces of components in the context of large-scale production.
  • the resulting magnetization When a coil is brought into the vicinity of the ferromagnetic component at the same time, the resulting magnetization generates an electrical pulse in the coil.
  • the addition of the pulses gives a noise-like signal, which is also called Barkhausen noise or Barkhausen noise signal.
  • the Barkhausen noise signal depends on the surface condition and in particular on the surface hardness.
  • the Barkhausen noise signal can be used to detect grinding burn because the surface hardness decreases during grinding firing.
  • Barkhausen noise does not depend on the surface condition of the component alone, but also on other factors and in particular the component geometry
  • a suitable calibration of a measuring device for Barkhausen noise analysis for the corresponding component geometry is required.
  • Component geometry is understood here and below to mean the specification of the dimensions of the component, as defined, for example, in a design drawing.
  • the calibration for a predetermined component geometry designed very complex, because it must be used for this purpose several components with this geometry, which were specifically produced with different surface damage, such as different grinding burn stages. The production can be done for example by grinding components with stepped deliveries. The components thus produced are tested with the measuring device to be calibrated, ie the corresponding Barkhausen noise signals are detected by the measuring device.
  • the first calibration curve describes the rough relationship between surface hardness values and Barkhausen noise signals. It reflects the trend of changing the Barkhausen noise signal when changing the surface hardness of any component.
  • the first calibration curve must therefore be determined only once and can then be used for any component geometries. The determination of the first calibration curve is described in more detail below.
  • a first reference component and a second reference component are used as part of the calibration. In this case, for the first reference component, which corresponds to the predetermined component geometry and has a first surface hardness value, a first Barkhausen noise signal is determined with the measuring device to be calibrated.
  • the first calibration curve is fitted to the first Barkhausen noise signal at the first surface hardness value and to the second Barkhausen noise signal at the second surface hardness value, whereby known curve fitting methods are used for this purpose can be.
  • the measured Barkhausen noise signal of the component can be assigned to a surface hardness value.
  • the calibration method according to the invention requires only two reference components whose Barkhausen noise signals are detected during the calibration.
  • a geometry-dependent second calibration curve can be determined in a suitable manner.
  • surface hardness values which are usually correlated with certain surface damage, can be determined by the Barkhausen noise signal.
  • the first calibration curve is fitted in such a way that the value of the second calibration curve is at the first surface hardness value corresponds to the first Barkhausen noise signal and the value of the second calibration curve corresponds to a second surface value of the second Barkhausen noise signal. If necessary, other curve fits can also be used in which the second calibration curve does not run exactly through the first or second Barkhausen noise signal.
  • one or more predetermined surface hardness values are assigned, via the second calibration curve, respective limit values of the Barkhausen noise signal.
  • various component damage can be represented by limiting values of the Barkhausen noise, with the corresponding surface damage being detected by the measuring device when the limit values are exceeded or fallen short of.
  • the predetermined component damage, for which respective limits of the Barkhausen noise signal are determined concern grinding burn stages of a component made by grinding.
  • the component to be tested is a toothed wheel.
  • a predetermined production process for producing the component is predetermined in each case for the first reference component and the second reference component. If the manufacturing process for the components is performed, this ensures that two components with different surface hardness values are generated.
  • the manufacturing process is in particular configured such that the reference components have a uniform surface hardness, so that a substantially constant Barkhausen noise signal is present when measuring the reference components in the measuring device to be calibrated.
  • the manufacturing process of the second reference component differs from the manufacturing process of the first reference component exclusively in that the manufacturing process of the second reference component comprises an additional step of heat treatment of the component.
  • the manufacturing process of the second reference component comprises an additional step of heat treatment of the component.
  • an upper and a lower limit value for the surface hardness of the component with the predetermined component geometry are predetermined, these limits being assigned a lower and upper limit value for the Barkhausen noise signal via the second calibration curve.
  • the upper and lower limits of the surface hardness specify a tolerance range which is specified in particular in the design drawing of the component with the predetermined component geometry. It should be ensured that this tolerance range is not left. This can be achieved by appropriately setting upper and lower limits for the Barkhausen noise signal using the second calibration curve. If the corresponding limit values are exceeded or fallen below, this can then be detected by the calibrated measuring device.
  • the calibration is adapted again within the component during testing of a component.
  • a surface area without surface damage is determined for a just tested with the measuring device component with the predetermined component geometry, wherein in the case that the minimum Barkhausen noise signal in the surface area without surface damage is greater than the Barkhausen noise signal of the first reference component, the lower limit of the Difference between these two Barkhausen noise signals is raised and the upper limit is changed depending on this difference.
  • This variant of the invention makes use of the knowledge that as a rule there is an area without surface damage in every component. As a result, the limit values can be adapted even more specifically to the specific component. The detailed description sets forth how a surface area without surface damage can be suitably determined from the corresponding Barkhausen noise signals of the tested device.
  • a self-calibration of the device also takes place via the cumulative number of components measured in series.
  • a total signal of the Barkhausen noise is determined, which z. B. may be the average of all along the surface of the component measured Barkhausen noise signal.
  • a statistical evaluation of total signals of several identical components in a start-up phase before the series measurement is used to determine a level of significance with which a tolerance range for the overall signal is determined during the series measurement for each overall signal, whereby a departure from the tolerance range is detected ,
  • the invention further relates to a surface inspection measuring apparatus based on Barkhausen noise for a predetermined component geometry.
  • a first, independent of the component geometry calibration curve is stored in a memory of the measuring device, which describes the dependence between surface hardness values and measured Barkhausen noise signals.
  • a first Barkhausen noise signal can be determined with the measuring device during its calibration.
  • a second reference component which corresponds to the predetermined component geometry and has a second surface hardness value which is smaller than the first surface value
  • a second Barkhausen noise signal can be determined with the measuring device during its calibration.
  • the measuring device comprises a computer unit, with which a second calibration curve is determined during the calibration of the measuring device, by the first calibration curve hardness value to the first Barkhausen noise signal on the first surface and the second Barkhausen noise signal is fitted on the second surface hardness value the second calibration curve during operation of the measuring device, the measured Barkhausen noise signal of a component with the predetermined component geometry hardness value can be assigned to a surface.
  • the measuring device according to the invention is preferably designed such that one or more of the preferred variants of the calibration method according to the invention can be carried out with the device.
  • Figure 1 is a schematic representation of the measurement process based on Barkhausen noise for a gear.
  • Fig. 3 is a diagram illustrating the experimentally determined relationship between the surface hardness and the grinding edge step of a gear wheel
  • Fig. 5 is a schematic representation showing the manufacture of first and second reference components based on an embodiment of the invention
  • FIG. 6 is a diagram showing the determination of a second calibration curve based on the first calibration curve according to an embodiment of the invention
  • FIGS. 7 and 8 are schematic diagrams illustrating modification of thresholds for the Barkhausen noise signal for components being measured based on an embodiment of the invention.
  • FIG. 9 is a diagram showing the detection of outliers in the context of the statistical evaluation of Barkhausen noise signals based on an embodiment of the method according to the invention.
  • the method according to the invention based on a calibration of a measuring device for surface inspection of components in the form of gears will be explained below. Nevertheless, the invention is also applicable to any other components.
  • the final contour of the gears was generated by means of gear grinding. In this grinding process, the allowance is machined by abrasive grains. As a result, the local temperatures at the contact zones can change so much that thermal microstructural changes occur. These thermal microstructural changes are often referred to as grinding burn. It is an object of the embodiment of the method according to the invention described here, to detect components which have abrasive-burn damage on the surface via a correspondingly calibrated measuring device.
  • grinding burns occur when the component-specific tempering temperature is exceeded and occurs in the form of damage to the ground, whereby the hardness of the affected area on the component decreases. A drastic increase in temperature and subsequent cooling by cooling lubricant results in a harder surface. This form of grinding burn is also called re-hardening.
  • damage to gears is detected by means of a measuring device based on Barkhausen noise.
  • Barkhausen noise is measured by applying an external magnetic field at corresponding points on the surface of the component being tested. Through a coil of conductive wire, the resulting magnetization generates an electrical pulse in the coil, which depends on the surface hardness. By adding the electrical impulse x, receives you get a noisy signal.
  • the RMS value of the Barkhausen signal is used as the measured value, which results from the following formula:
  • the abbreviation mp known per se represents the magnetic parameter.
  • Fig. 1 illustrates a measurement curve for determining the Barkhausen noise for a gear.
  • a tooth gap of the gear is reproduced in a perspective view. This tooth gap is between the two teeth 101 and 102, which are only partially shown.
  • a corresponding sensor head of the measuring device is moved along measuring lines M1 to M4, the Barkhausen noise signal being continuously measured in the method. 1 shows, by way of example, a measuring course in which the measuring head, starting from the point PS1, moves first to the surface point PS2 at the tooth 101 and then along the measuring line M1 to the point PS3. Subsequently, another measurement takes place from the point PS4 to the point PS5 along the measuring line M2.
  • the tooth 102 is first measured along the measuring line M3 from the point PS6 to the point PS7 and finally along the measuring line M4 from the point PS8 to the point PS9. 1 shows a sectional view of the tooth 102 in the right-hand part. It can be seen that the measuring lines M3 and M4 are perpendicular to the plane of the page. In this case, the size h represents the tooth height that can be used for the measurement, and the corresponding distances of the measurement lines M3 and M4 from the lower or upper end of the usable tooth height are indicated by b m / 2. The distance between M3 and M4 is denoted by x.
  • the Barkhausen noise analysis measures the hardness or the properties of components not directly, but indirectly over the Barkhausen noise
  • a suitable calibration of the measuring device used is required.
  • the Barkhausen noise signal which is also referred to below as the BNA signal
  • the BNA signal also depends on the component geometry, so that a corresponding calibration of the measuring device for the component geometry to be measured is required.
  • a limit value for the BNA signal or its amplitude is defined via the calibration, this limit value correlating with a state of the component in which the component is located shortly before the formation of the grinding burn.
  • corresponding limits for different levels of grinding firing may also be established by calibration.
  • the corresponding limit values of the Barkhausen noise signals can be adapted again within the framework of a statistical evaluation of the measured values of a single component for this component.
  • the component-specific limit values can optionally be adapted again by the statistical evaluation of the measured values from a plurality of components measured in series.
  • the components do not have to correspond in geometry to the components measured later via the measuring device, since only a trend of the Barkhausen noise signals as a function of grinding burn must be detected.
  • the thermally damaged components is finally tested by Nitaliseren for grinding burn. From this, the grinding burn stages are derived, which result from corresponding discoloration on the component surface in the context of Nitaliserens.
  • the components will be treated at defined locations with abrasive burn damage using Barkhausen noise analysis. measure up. For measurement, any measuring device can be used. In particular, the measuring device to be calibrated does not have to be used for this purpose. At the defined locations with grinding firing, hardness measurements are also carried out with another method.
  • FIG. 3 shows a determined relationship between grinding burn stages ascertained via Nital etching and surface hardening of components determined using a separate method.
  • the surface hardness SH (measured in HV1) and along the ordinate the grinding burners S between the values 0 and 10 are reproduced.
  • the Barkhausen noise signals on the damaged surfaces of the components can then be made a correlation of these signals with the surface hardness and thereby the first calibration curve C1 are obtained, which is indicated in Fig. 4.
  • the associated Barkhausen noise signals BN are plotted for different surface hardness values SH, wherein the calibration curve C1 was determined via a suitable polynomial fit.
  • the insights gained from the determination of the first calibration curve are individually adjusted for each component type. This takes into account the fact that the BNA signals are not only dependent on the surface hardness but also on the component geometry.
  • the two master components are produced by targeted heat treatment processes.
  • the first master component corresponds to the state "good”, ie the burn-free state is represented by this first master component
  • the second master component corresponds to the state "bad”. That is, the abrasive burn damaged condition is represented by this master component.
  • the master components are manufactured according to a predetermined manufacturing sequence, examples of manufacturing sequences being illustrated in FIG. 5.
  • a master component is initially present in the input state
  • the tuple of surface hardness SH1 and associated Barkhausen noise signal BN1 for the first reference component is represented by P1.
  • the tuple P2 shows the correlation between the surface hardness SH2 and the Barkhausen noise signal BN2 for the second reference component.
  • the calibration curve C1 is adjusted to the values P1 and P2 in such a way that the calibration curve continues to show the trend of the dependence of the Barkhausen noise on the surface hardness, but passes through the points P1 and P2 or close to these points.
  • a correspondingly adapted calibration curve is reproduced in FIG. 6 as second curve C2.
  • the corresponding polynomial equations for the calibration curve C1 (upper equation) and for the calibration curve C2 (lower equation) are reproduced for the illustrated scenario.
  • a lower limit for the component surface hardness is predetermined, which is predetermined for the corresponding component to be tested. If this surface hardness is undershot, it is assumed that grinding burns are present.
  • this limit value of the hardness can now be linked to a corresponding upper limit value of the Barkhausen noise signal, wherein when the upper limit value is exceeded
  • a component-internal self-calibration of the measuring device for the component being measured is also made for each measurement of a component, which is valid only for this component.
  • This self-calibration will be described in detail below and is also shown in FIG.
  • the background of the method of self-calibration is that the BNA measurement signals depend not only on the surface hardness of many other influencing factors. Examples of this are the toothing geometry (tooth width dimension), the creation of the measuring program for sensor guidance of the measuring device, the sensor wear and the like. Due to the experience, however, there is no abrasive component damaged in series production, which does not have a good range with a surface hardness in the standard.
  • the basic idea of the component self-calibration is based on this knowledge. That is, the good area on a part to be measured where no grinding burn is present is defined as the reference area. This reference range is classified as the first master component described above. Based on the BNA signals in the reference range, the limit values for the BNA signal described above are then suitably shifted or adjusted.
  • the self-calibration is divided into the following steps in the embodiment described here:
  • the dominant characteristic can be for a gear z. For example, be determined whether large differences in the signals corresponding to the grid squares for different tooth flanks or for different peripheral areas occur. This makes it possible to determine in a suitable manner by comparing the differences as to whether the characteristic dominates concentricity errors or of random loops. According to the dominant characteristic, a good range for a tooth flank or a peripheral portion of the gear is then suitably determined. This good range has the lowest BNA signals, and the minimum value of the BNA signals in that reference range is then used to adjust the limits, as described below.
  • FIG. 7 shows the corresponding definition of a good reference range with low BNA signals for the characteristic of a concentricity error.
  • Individual circumferential sections are specified by ring segments along the circumference of the gearwheel.
  • the area B1 was identified as the reference area. This area thus has no surface damage.
  • the two adjacent areas B2 are circumferential sections with higher BNA measured values, which represent transition areas to the area B3 with the highest BNA signal and thus the highest risk of grinding burns.
  • the BNA signal for the gear 1 is reproduced as a curve L1.
  • the curve L2 represents the Barkhausen noise signal measured along the circumference of the first reference component.
  • the lower limit value GW1 and the upper limit value GW2, which were determined on the basis of the calibration curve C2, are reproduced, as described above.
  • the area B1 is now considered without the surface damage.
  • the curve L2 is shifted to the minimum value of the BNA signal of the curve L1 within this range, which is indicated by the curve L3.
  • the adjustment of the lower limit value GW1 then takes place in accordance with this shift, which can be seen from FIG. 8.
  • the lower limit value GW1 is shifted upward as shown in FIG. 8 by the displacement path between curves L2 and L3.
  • the shifted limit value is designated GW1 'and indicated by a dashed line.
  • a shift of the upper limit value GW2 also takes place. In this case, the upper limit GW2 is shifted downward and then leads to the modified limit GW2 ', which in turn is indicated by a dashed line.
  • the size and direction of the shift of the limit value GW2 can be determined beforehand by a suitably fixed ratio.
  • the ratio may be 1.
  • the upper limit as far and in the same direction as the lower limit shifted.
  • a suitable ratio is determined based on one or more influencing variables which influence the limit values and thus the BNA signals.
  • One such influencing factor is eg the sensor wear.
  • the calculation of a corresponding ratio for the influencing variable sensor wear runs in such a way that the corresponding calibration curves C2 according to FIG. 6 are determined for a measuring device with a severely worn sensor and a measuring device with a less worn sensor and from this the upper and lower limit values for the differently worn sensors are determined.
  • the quotient of the change of the upper limit value is formed as a function of the sensor wear and the change of the lower limit value as a function of sensor wear.
  • This ratio thus represents the factor with which the upper limit value is shifted as a function of the change in the lower limit value according to FIG. 8.
  • the ratio may optionally be negative, which is also the case in Fig. 8, where the shift of the lower limit upward results in a shift of the upper limit down.
  • ratios for several influencing variables can also be used to determine the ratio, such as e.g. different gearing geometries, different contact conditions between sensor and surface and the like. If the ratios for several influencing variables are determined, that ratio is used for determining the shift of the upper limit value, which had the most dominant influence on the change of the limit values. This can be determined by how strong the changes of the limit values were in the assessment of the corresponding influencing variable.
  • Components whose overall signal is outside the tolerance range are identified as outliers and initially classified as damaged. These components are cross-checked with another test method, such as hardness measurement or residual stress measurement. If the component is classified as undamaged after the cross check, the significance level is reduced and thus the tolerance range is increased. Thus, after the recalculation of the tolerance range, the component is no longer identified as damaged. In the event that the corresponding component, which was detected as an outlier, is classified as damaged after the cross check, the significance level remains unchanged and thus also the tolerance range. If necessary, it is also possible to countercheck those components whose signals are within the tolerance range, but are located in the vicinity thereof (eg at 80% of the corresponding limits of the tolerance range).
  • the significance level is increased so that the tolerance range is narrowed. This process is used to adjust the level of significance so that both the non-recognition of damaged components and the incorrect classification of components without surface damage as damaged components is avoided as possible.
  • this significance level is finally used in the series measurement of the components as a further criterion for determining damaged components.
  • FIG. 9 In this diagram along the abscissa the corresponding numbers N of the successively measured in series components and along the ordinate the total signals BN determined for these components of Barkhausen noise are indicated. The signals form the line L4. Further, the lower and upper limits GW1 and GW2 are shown in analogy to FIG. 7 and FIG. 8, respectively. For each new value of the overall signal is over the significance level determined in the start-up phase determines a corresponding tolerance range, which is represented by a lower limit G1 and an upper limit G2. In Fig.
  • an outlier A which represents a component with a signal which is outside the tolerance range.
  • This component is then classified as damaged, whereupon, for example, a corresponding message can be output by the measuring device.
  • an optimization of the tolerance range can also take place within the scope of the series measurement.
  • a runaway is randomly checked to see whether the component is actually damaged. If this is not the case, the significance level and thus the tolerance range are adjusted.
  • the variant of a statistical evaluation of the Barkhausen noise signals of components in series measurement just described is also indicated in FIG.
  • the embodiments of the method according to the invention described above have a number of advantages.
  • the calibration effort for limiting value determination or for limiting value adjustment is substantially reduced in comparison to conventional calibration methods.
  • the calibration uses a coarse calibration curve independent of the geometry of the component and performed on a fundamental basis for each material to determine correlations between appearance (burn-up by nital etching), physical component property (component surface area), and measure (BNA Signal) with respect to a particular material.
  • These basics are then component-adapted by using two additional master components with and without surface damage for calibration, which produce the correlations of the BNA signals with respect to the type of component to be tested.

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Abstract

L'invention concerne un procédé d'étalonnage d'un dispositif de mesure pour l'inspection de surface basé sur le bruit Barkhausen pour une géométrie de pièce prédéterminée. Le procédé selon l'invention est caractérisé en ce qu'une première courbe d'étalonnage (C1) indépendante de la géométrie de la pièce, décrivant la dépendance entre les valeurs de dureté de surface (SH) et les signaux de bruit Brakhausen (BN) mesurés est prédéfinie. Un premier signal de bruit Barkhausen (BN1) est obtenu au moyen du dispositif de mesure, pour une première pièce de référence correspondant à la géométrie de pièce prédéterminée, et présentant une première valeur de dureté de surface (SH1). Un second signal de bruit Barkhausen (BN2) est obtenu au moyen du dispositif de mesure, pour une seconde pièce de référence correspondant à la géométrie de pièce prédéterminée et présentant une seconde valeur de dureté de surface (SH2), inférieure à la première valeur de dureté de surface (SH1) Pour finir, une seconde courbe d'étalonnage (C2) est déterminée par ajustement de la première courbe d'étalonnage (C1) au premier signal de bruit Barkhausen (BN1) pour la première valeur de dureté de surface (SH1) et au second signal de bruit Barkhausen (BN2) pour la seconde valeur de dureté de surface (SH2), la seconde courbe d'étalonnage (C2) permettant d'associer le signal de bruit Barkhausen (SH) mesuré d'une pièce (1) présentant la géométrie de pièce prédéterminée à une valeur de dureté de surface (SH) lors de l'utilisation du dispositif de mesure.
EP13709821.6A 2012-04-05 2013-03-04 Procédé d'étalonnage d'un dispositif de mesure destiné à l'inspection de surfaces, basé sur le bruit barkhausen pour une géométrie de pièce prédéterminée Withdrawn EP2834629A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012205676A DE102012205676A1 (de) 2012-04-05 2012-04-05 Verfahren zum Kalibrieren einer Messvorrichtung zur Oberflächenprüfung basierend auf Barkhausenrauschen für eine vorbestimmte Bauteilgeometrie
PCT/EP2013/054229 WO2013149775A1 (fr) 2012-04-05 2013-03-04 Procédé d'étalonnage d'un dispositif de mesure destiné à l'inspection de surfaces, basé sur le bruit barkhausen pour une géométrie de pièce prédéterminée

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US (1) US9404989B2 (fr)
EP (1) EP2834629A1 (fr)
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CN107064219B (zh) * 2016-10-27 2020-04-07 中国地质大学（武汉） 一种基于趋肤效应的铁磁性导体表面硬度测量方法及系统
FR3069635B1 (fr) * 2017-07-25 2019-08-02 Continental Automotive France Procede de calibration automatique d'un capteur d'arbre a cames pour moteur de vehicule automobile
CN109357868B (zh) * 2018-10-08 2020-09-22 中国矿业大学 轴承套圈的扫频涡流与巴克豪森噪声法的综合分选方法

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WO2013149775A1 (fr) 2013-10-10
US9404989B2 (en) 2016-08-02
DE102012205676A1 (de) 2013-10-10

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