EP3290154B1 - Procédé de surveillance d'un processus de meulage - Google Patents

Procédé de surveillance d'un processus de meulage Download PDF

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Publication number
EP3290154B1
EP3290154B1 EP17189558.4A EP17189558A EP3290154B1 EP 3290154 B1 EP3290154 B1 EP 3290154B1 EP 17189558 A EP17189558 A EP 17189558A EP 3290154 B1 EP3290154 B1 EP 3290154B1
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EP
European Patent Office
Prior art keywords
sanding
belt
workpiece
sensor unit
grinding
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.)
Active
Application number
EP17189558.4A
Other languages
German (de)
English (en)
Other versions
EP3290154A3 (fr
EP3290154C0 (fr
EP3290154A2 (fr
Inventor
Thomas RÄBER
Matthias Bach
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.)
Steinemann Technology AG
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Steinemann Technology AG
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Publication date
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Publication of EP3290154A3 publication Critical patent/EP3290154A3/fr
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Publication of EP3290154B1 publication Critical patent/EP3290154B1/fr
Publication of EP3290154C0 publication Critical patent/EP3290154C0/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/06—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving members with limited contact area pressing the belt against the work, e.g. shoes sweeping across the whole area to be ground
    • B24B21/08—Pressure shoes; Pressure members, e.g. backing belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/12—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent

Definitions

  • the invention relates to a method for monitoring a grinding process, a method for controlling and/or regulating a grinding process.
  • Belt grinding machines are known in the art. Devices and methods for controlling, regulating, and monitoring a grinding process are also known.
  • the DE 199 15 909 C2 proposes a method for controlling a grinding process.
  • sensors are to be used to monitor the grinding process.
  • a human i.e., an operator
  • the operator is responsible, for example, for determining whether chatter marks are present by chalking the surface of a workpiece, such as a chipboard.
  • the DE 10 2012 109 086 A1 deals with the monitoring of a grinding process. For example, she suggests using sensors for each A change in the position of the workpiece to be ground is also proposed. It is also proposed to install a testing station downstream of the belt grinder, whose sensors examine the machined workpiece for compliance with certain parameters. If this examination reveals that the workpiece cannot be released, it is sent to an operator for further inspection.
  • the DE 10 2007 012 780 A1 A scanner beam is known, which is similar to the aforementioned inspection station.
  • the scanner beam can be arranged in front of the grinding unit.
  • the information acquired by the scanner beam can be transmitted to a control unit of the belt grinding machine to determine which pressure elements of the pressure beam should be used to process the workpiece.
  • the DE 10 2007 012 780 A1 further proposes placing a scanner beam behind the grinding unit to capture information about the surface of the workpiece being machined. Such information could, for example, relate to the surface structure or color, as well as its roughness. This information can then be compared with reference values. This allows the grinding result and abrasive wear to be assessed.
  • the object of the invention is to overcome the disadvantages of the prior art.
  • the pressure applied to the workpiece can be adjusted by adjusting the pressure of the contact rollers and/or the sanding pads of the two grinding heads.
  • the opposing grinding head which acts as a counterbearing, is missing.
  • This counterbearing function can be fulfilled either by the feed device or by a counterpressure roller.
  • a counterpressure roller is preferably provided opposite the individually arranged grinding head and applies pressure from the non-machined side of the workpiece, or the side to be sanded, which is directed onto the sanding belt.
  • chatter marks may also be considered to assign certain properties of chatter marks to certain causes based on empirical values or regularities and without prior tests and to ensure by suitable measures that the sensor unit can also make this assignment if it recognizes at least one specific property of a detected chatter mark.
  • amplitude of the chatter mark in the workpiece for example the amplitude at a specific position in the workpiece or the maximum amplitude or the average amplitude or a depth and/or height profile; a position of the chatter mark on the workpiece; an orientation of the chatter mark on the workpiece; a width of the chatter mark; a length of the chatter mark and the like.
  • the characteristics of at least two chatter marks can also be attributed to specific causes in advance through preliminary tests. By evaluating these characteristics, a conclusion can be drawn about the cause, or at least the most likely cause. If, for example, the spacing of the chatter marks is indifferent to a change in the feed speed, a defect in the feed mechanism or feed system is suspected. For example, a transport roller in the feed mechanism could be defective or faulty.
  • a well-known rule is that a formula can be used to determine whether given chatter marks are caused by the belt joint.
  • the distance M between two chatter marks caused by the belt joint is calculated by dividing the product of the sanding belt length L and the feed rate v v by the product of sixty times the sanding belt speed v s and the number of belt joints n of the sanding belt in question.
  • the distance between the chatter marks and the sanding belt length are measured in mm.
  • the feed rate is measured in meters per minute, and the sanding belt speed in meters per second.
  • the sensor unit and the evaluation unit detect all chatter marks on a workpiece and then determine whether the distances between some or all of the chatter marks satisfy at least one of the aforementioned rules.
  • This allows even chatter mark series that have different causes and that overlap can be analyzed.
  • the sensor unit and the evaluation unit can detect the distances to all other chatter marks on a workpiece for each chatter mark present on the workpiece.
  • those chatter marks can be identified that satisfy one of the aforementioned rules and thus indicate, for example, the belt splices or an out-of-round contact roller.
  • chatter marks may be assigned to specific causes based on their properties or characteristics, or to verify an existing assignment using properties or characteristics. For example, if the spacing of an identified number or series of chatter marks indicates the contact roller as the cause, and it is further known that such chatter marks lie within certain limits with regard to certain characteristics, such as amplitude, depth and/or height profile, or width, then it can be verified by analyzing these characteristics and comparing them with the aforementioned limits whether the chatter marks in question are actually attributable to the contact roller as the cause.
  • Such a change could, for example, be replacing a sanding belt, as sanding belts vary in their properties and, for example, differ in whether they produce a coarser or finer finish. Whether the finish is coarser or finer can depend, among other things, on the following sanding belt parameters: grain type, grain shape, grain size, grain distribution, as well as the selection of a binder and filler.
  • the specified limit values can be set, for example, by an operator. Depending on which characteristics or properties are detected by the sensor unit and transmitted to the evaluation unit as measured data, it may be appropriate to specify an upper limit or a lower limit. If the characteristic to be detected is to remain within a certain range and thus not exceed an upper limit or fall below a lower limit, it may also be considered to specify both an upper limit and a lower limit.
  • the output signal can be a warning signal or a control signal. Of course, it's also possible to output both a warning signal and a control signal.
  • warning signal this can be an acoustic, a visual, or another type of warning signal, either individually or in combination.
  • the warning signal can also be transmitted to a suitable signaling device, such as a siren or a horn.
  • the signal can also be displayed on the belt grinder's control panel.
  • a control signal it can be envisaged that if the limit value is exceeded or undershot, a control signal is generated and transmitted to the belt grinder, in particular to its control and/or regulating device. If a limit value with regard to roughness is exceeded and the surface of the workpiece is therefore too rough, a control signal can be generated, for example, which increases the pressure with which the contact roller or the sanding pad applies the sanding belt. If a characteristic is detected which indicates a malfunction of the belt grinder that requires repair, a control signal can be generated which causes an emergency stop of the belt grinder.
  • measurement data recorded by the sensor unit and evaluated by the evaluation unit are compared with limit values, whereby a signal is output when a predetermined limit value is exceeded or undershot, whereby the limit value depends on at least one property or setting of the belt grinding machine.
  • the limit value(s) do not have to be fixed and unchangeable for each belt grinder, but can be adapted to the settings and properties, i.e. to the configuration of the belt grinder.
  • the aforementioned properties and settings of the belt sander include, within the scope of the present invention, for example, a quality or type of the sanding belt, a grain sequence, i.e. properties and quality of a grain of several consecutive sanding belts, a predetermined and/or an actually measured feed or feed speed, a feed direction, a sanding belt speed, a quality or type of the sanding head, a quality or type of the sanding shoe and a quality or type of the contact roller.
  • a quality or type of the sanding belt a grain sequence, i.e. properties and quality of a grain of several consecutive sanding belts, a predetermined and/or an actually measured feed or feed speed, a feed direction, a sanding belt speed, a quality or type of the sanding head, a quality or type of the sanding shoe and a quality or type of the contact roller.
  • the limit value(s) can either be set by an operator or specified automatically.
  • the operator selects the limit value based on his or her experience or specific work instructions and depending on the aforementioned characteristics and settings or the configuration of the belt grinder.
  • the limit value is specified automatically, it can be envisaged, for example, that an operator enters the aforementioned properties and settings of the belt grinding machine via a control panel and the control and/or regulation device calculates the limit value based on this input.
  • Suitable sensors are preferably used to detect the condition or type of the grinding belt, grinding head, grinding pad, contact roller, etc. Furthermore, sensors for detecting the feed rate and direction can be considered.
  • measurement data recorded by the sensor unit and evaluated by the evaluation unit are recorded over a period of time and combined to form a measurement curve, whereby a property of the measurement curve is calculated, whereby a signal is output if the property of the measurement curve deviates to a certain extent from a specification with regard to this property.
  • a measurement over a period of time is often more meaningful. Which of the aforementioned characteristics of the measurement curve is meaningful enough to be used to output the signal can be determined in preliminary tests.
  • the time period can be adapted to the grinding process. It is also possible to combine the recorded measured values into different measurement curves based on different time periods. For example, it might be possible to calculate fluctuations or maxima of the measurement curve both on a specific day and over the previous 10 days. If the fluctuations or maxima on the observed day deviate significantly from the fluctuations and maxima of the previous 10 days, this may require intervention in the grinding process, which can be achieved by outputting a signal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Claims (3)

  1. Procédé de surveillance d'un processus de ponçage dans lequel une pièce en forme de plaque est poncée dans une ponceuse à bande,
    dans lequel la ponceuse à bande dispose d'une tête de ponçage qui comprend un cylindre de contact et/ou un patin de ponçage et au moins un rouleau de déviation,
    dans lequel une bande de ponçage est guidée par le au moins un rouleau de déviation ou conjointement par le au moins un rouleau de déviation et le cylindre de contact,
    dans lequel la ponceuse à bande dispose d'un dispositif d'avance pour déplacer la pièce par rapport à la tête de ponçage pendant le processus de ponçage,
    dans lequel la bande de ponçage est pressée sur une surface de la pièce par le cylindre de contact et/ou par le patin de ponçage pendant le ponçage,
    dans lequel en outre une unité de détection pour palper la surface de la pièce, qui est en liaison avec une unité d'évaluation, est associée à la ponceuse à bande,
    caractérisé en ce que
    l'unité de détection palpe la surface de la pièce après le ponçage,
    dans lequel l'unité de détection et l'unité d'évaluation saisissent la rugosité de la surface de la pièce et, dans le cas d'une modification d'un réglage de la ponceuse à bande, saisissent la rugosité aussi bien avant qu'après l'exécution de la modification,
    dans lequel l'unité de détection et l'unité d'évaluation sont configurées pour saisir une présence d'au moins une marque de broutage,
    dans lequel, dans le cas de la présence d'au moins une marque de broutage sur la surface de la pièce, une propriété et/ou une qualité de la au moins une marque de broutage sont saisies par l'unité de détection et l'unité d'évaluation,
    dans lequel à l'aide de la nature de la marque de broutage, il est déterminé si la marque de broutage est causée par une liaison de bande de la bande de ponçage et/ou par le cylindre de contact et/ou par le dispositif d'avance et/ou par un autre composant de la ponceuse à bande,
    dans lequel les données de mesure saisies par l'unité de détection et évaluées par l'unité d'évaluation sont comparées à des valeurs limites prédéterminées, dans lequel un signal est émis lorsqu'une valeur limite prédéterminée est franchie vers le haut ou vers le bas,
    dans lequel, pour surveiller le processus de ponçage, l'unité de détection est avantageusement disposée en aval ou derrière la tête de ponçage dans le sens d'avance pour palper la surface de la pièce poncée,
    dans lequel, en fonction des données de mesure saisies et/ou en fonction du signal émis, au moins l'une des actions suivantes est ensuite effectuée:
    - arrêt de la ponceuse à bande ou du processus de ponçage,
    modification d'au moins un réglage de la ponceuse à bande, où des capteurs sans contact, tels que des capteurs optiques, sont utilisés.
  2. Procédé selon la revendication 1, caractérisé en ce que les données de mesure détectées par l'unité de détection et évaluées par l'unité d'évaluation sont comparées à des valeurs limites, où un signal est émis lorsqu'une valeur limite prédéterminée est franchie vers le haut ou vers le bas, dans lequel la valeur limite dépend d'au moins une propriété ou d'un réglage de la ponceuse à bande.
  3. Procédé selon la revendication 1, caractérisé en ce que les données de mesure saisies par l'unité de détection et évaluées par l'unité d'évaluation sont saisies sur une période et combinées en une courbe de mesure, où une propriété de la courbe de mesure est calculée,
    où un signal est émis lorsque la propriété de la courbe de mesure s'écarte dans une mesure déterminée d'une spécification concernant cette propriété.
EP17189558.4A 2016-09-06 2017-09-06 Procédé de surveillance d'un processus de meulage Active EP3290154B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016116622.7A DE102016116622A1 (de) 2016-09-06 2016-09-06 Verfahren zur Überwachung eines Schleifprozesses

Publications (4)

Publication Number Publication Date
EP3290154A2 EP3290154A2 (fr) 2018-03-07
EP3290154A3 EP3290154A3 (fr) 2018-07-25
EP3290154B1 true EP3290154B1 (fr) 2025-07-09
EP3290154C0 EP3290154C0 (fr) 2025-07-09

Family

ID=59799297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17189558.4A Active EP3290154B1 (fr) 2016-09-06 2017-09-06 Procédé de surveillance d'un processus de meulage

Country Status (2)

Country Link
EP (1) EP3290154B1 (fr)
DE (1) DE102016116622A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018202618A1 (de) * 2018-02-21 2019-08-22 Homag Bohrsysteme Gmbh Schleifvorrichtung sowie Verfahren zur Erfassung eines Zustands eines durch eine Schleifvorrichtung bearbeiteten Werkstücks
DE102018105133A1 (de) 2018-03-06 2019-09-12 Karl Heesemann Maschinenfabrik Gmbh & Co. Kg Verfahren zum Betreiben einer Schleifvorrichtung
DE102019207745A1 (de) * 2019-05-27 2020-12-03 Robert Bosch Gmbh Verfahren zum Erfassen einer auf einem Schleifband vorgesehenen Information
DE102019207746A1 (de) * 2019-05-27 2020-12-03 Robert Bosch Gmbh Verfahren zum Ermitteln einer Zustandsinformation betreffend eine Bandschleifmaschine mittels eines maschinellen Lernsystems
DE102020119149A1 (de) 2020-07-21 2022-01-27 Karl Heesemann Maschinenfabrik Gmbh & Co. Kg Verfahren zum Schleifen einer Oberfläche eines Werkstückes und Vorrichtung dazu

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3527265A1 (de) * 1985-07-30 1987-02-12 Georg Weber Bandschleifmaschine
US5512009A (en) 1994-03-01 1996-04-30 Minnesota Mining And Manufacturing Company Method and apparatus for attenuating optical chatter marks on a finished surface
DE19915909C2 (de) 1998-12-11 2003-05-28 Steinemann Technology Ag St Ga Verfahren zur Steuerung des Schleifprozesses sowie Rechnersteuerung für Breitschleifmaschine
DE102004045418A1 (de) * 2004-03-16 2005-10-06 Waldrich Siegen Werkzeugmaschinen Gmbh Verfahren und Vorrichtung zum Schleifen einer Walze
DE102007012780A1 (de) 2006-03-21 2007-09-27 Hans Weber Maschinenfabrik Gmbh Vorrichtung zum optischen Erfassen von Umriss und Oberflächeneigenschaften flächiger Werkstücke in einer Breitbandschleifmaschine
US7699686B2 (en) 2006-11-03 2010-04-20 Severstal Sparrows Point, Llc Method for polishing and aluminum-zinc hot-dip coating
DE102012109086A1 (de) 2012-09-26 2012-12-27 Friedrich Kuhlmeyer Bandschleifvorrichtung und deren Arbeitsverfahren
WO2014165891A1 (fr) 2013-04-10 2014-10-16 Berndorf Band Gmbh Dispositif et procédé de ponçage d'une bande métallique

Also Published As

Publication number Publication date
EP3290154A3 (fr) 2018-07-25
DE102016116622A1 (de) 2018-03-08
EP3290154C0 (fr) 2025-07-09
EP3290154A2 (fr) 2018-03-07

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