CH680389A5 - Grinding disc noise monitoring system - uses capacitive coupling between rotary sensor and stationary evaluation device - Google Patents
Grinding disc noise monitoring system - uses capacitive coupling between rotary sensor and stationary evaluation device Download PDFInfo
- Publication number
- CH680389A5 CH680389A5 CH118890A CH118890A CH680389A5 CH 680389 A5 CH680389 A5 CH 680389A5 CH 118890 A CH118890 A CH 118890A CH 118890 A CH118890 A CH 118890A CH 680389 A5 CH680389 A5 CH 680389A5
- Authority
- CH
- Switzerland
- Prior art keywords
- evaluation device
- work spindle
- grinding disc
- grinding
- monitoring system
- Prior art date
Links
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
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
- G01H1/003—Measuring characteristics of vibrations in solids by using direct conduction to the detector of rotating machines
Abstract
The grinding disc noise monitoring system uses a sensor attached to the rotating work spindle (5) supplying a signal coupled via a stationary and a relatively rotating capacitor plate, to an evaluation device (13) attached to the housing of the machine. The sensor may be attached to the work spindle (5) for the workpiece (2) for the grinding disc (1), or 2 similar sensors may be attached to both spindles, each providing a signal fed to the evaluation device (13) via a respective capacitive coupling. ADVANTAGE - Noise-free signal transmission for improved sensitivity.
Description
Einrichtungen zum Erfassen und Übertragen eines Schleifgeräusches werden zur Zeit sowohl in Schleifmaschinen mit nichtautomatisiertem als auch in Schleifmaschinen mit automatisiertem Fertigungsablauf angewandt. Als Sensoren werden elektromagnetische, elektroinduktive und piezoelektrische Wandler verwendet, die das Geräusch, welches beim Schleifvorgang zwischen Werkstück und Schleifkörper entsteht, durch Körperschalleitung empfangen und in ein elektrisches Signal umwandeln.
Dieses elektrische Signal wird dann in einem Auswertegerät verarbeitet und dient zur Auslösung von Anzeigen oder Steuerfunktionen.
Das Geräusch entsteht an bewegten Teilen der Schleifmaschine, nämlich an der den Schleifkörper haltenden Schleifspindel oder an der das Werkstück haltenden Arbeitsspindel. Von diesen rotierenden Spindeln her wird das Geräusch über Lagerungen auf feststehende Gehäuse und von dort aus zum Auswertgerät übertragen.
Der Nachteil dieses Systems liegt nun darin, dass die über die Lagerungen vom rotierenden auf die feststehenden Teile der Maschine übertragenen Körperschallschwingungen einesteils stark gedämpft, andernteils durch zusätzliche Störschwingungen von Lagerung oder aussenliegenden Störquellen verzerrt werden.
Eine einwandfreie Auswertung des Schleifgeräusches durch das Auswertgerät bereitet daher Schwierigkeiten und kann zu Fehlanzeigen oder fehlerhaften Steuerkommandos an der Maschine führen. Diese beeinflussen den gesamten Bearbeitungsprozess und damit die Güte der gefertigten Werkstücke.
Der Erfindung liegt nun die Aufgabe zugrunde, diese lange und störenden Einflüssen ausgesetzte Übertragungskette des Schleifgeräusches zu verkürzen.
Durch die in den Patentansprüchen beschriebene Anordnung wird das Erfassen und Übertragen des Schleifgeräusches derart gelöst, dass das elektrische Signal eines auf der rotierenden Arbeitsspindel angebrachten Körperschallsensors über mindestens eine rotierende und eine feststehende Kondensatorplatte auf das stillstehende Gehäuse, in welchem die Arbeitsspindel gelagert ist, übertragen wird.
Der Körperschallsensor kann dabei auf der den Schleifkörper als auch auf der das Werkstück tragenden Arbeitsspindel angebracht sein.
Im folgenden wird anhand der einzigen Figur der beiliegenden schematischen Zeichnung ein Beispiel einer Einrichtung zum Erfassen und Übertragen eines Schleifgeräusches beschrieben:
Der Schleifkörper 1 ist in Kontakt mit dem Werkstück 2 und erzeugt an der Eingriffstelle 3 ein Geräusch.
Diese Körperschallschwingungen werden auf die Spannvorrichtung 4 und die Arbeitsspindel 5, welche in den Lagerungen 6 und 7 rotierend gelagert ist, übertragen. Weiter werden die Körperschallschwingungen mittels des auf der Arbeitsspindel 5 angebrachten Körperschallsensors 8 als elektrisches Signal auf die rotierenden Kondensatorplatten 9 und 10 übertragen.
Von dort aus erfolgt die Übertragung auf die festen Kondensatorplatten 11 und 12 und von diesen auf das Auswertegerät 13, in welchem die weitere Verarbeitung des Signals erfolgt.
Die mit dieser Erfindung beschriebene Einrichtung minimalisiert den Einfluss zusätzlicher Störquellen und erlaubt einwandfreie Übertragung eines Schleifgeräusches.
Devices for detecting and transmitting a grinding noise are currently used both in grinding machines with non-automated and in grinding machines with an automated production process. Electromagnetic, electro-inductive and piezoelectric transducers are used as sensors, which receive the noise, which occurs during the grinding process between the workpiece and the grinding body, through the body formwork line and convert it into an electrical signal.
This electrical signal is then processed in an evaluation device and is used to trigger displays or control functions.
The noise is generated on moving parts of the grinding machine, namely on the grinding spindle holding the grinding body or on the work spindle holding the workpiece. The noise is transmitted from these rotating spindles via bearings to fixed housings and from there to the evaluation device.
The disadvantage of this system is that the structure-borne sound vibrations transmitted by the bearings from the rotating to the stationary parts of the machine are partly strongly damped, while others are distorted by additional interference vibrations from the bearing or external interference sources.
Correct evaluation of the grinding noise by the signal conditioning instrument therefore creates difficulties and can lead to incorrect displays or incorrect control commands on the machine. These influence the entire machining process and thus the quality of the manufactured workpieces.
The invention is based on the object of shortening the transmission chain of the grinding noise which is exposed to long and disruptive influences.
The arrangement described in the claims solves the detection and transmission of the grinding noise in such a way that the electrical signal of a structure-borne noise sensor mounted on the rotating work spindle is transmitted to the stationary housing in which the work spindle is mounted via at least one rotating and one fixed capacitor plate .
The structure-borne noise sensor can be attached to the work spindle carrying the grinding wheel as well as to the work spindle.
An example of a device for detecting and transmitting a grinding noise is described below with reference to the single figure of the accompanying schematic drawing:
The grinding wheel 1 is in contact with the workpiece 2 and generates a noise at the point of engagement 3.
These structure-borne sound vibrations are transmitted to the tensioning device 4 and the work spindle 5, which is rotatably supported in the bearings 6 and 7. The structure-borne sound vibrations are also transmitted as an electrical signal to the rotating capacitor plates 9 and 10 by means of the structure-borne sound sensor 8 mounted on the work spindle 5.
From there the transmission takes place to the fixed capacitor plates 11 and 12 and from there to the evaluation device 13, in which the further processing of the signal takes place.
The device described with this invention minimizes the influence of additional sources of interference and allows perfect transmission of a grinding noise.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH118890A CH680389A5 (en) | 1990-04-09 | 1990-04-09 | Grinding disc noise monitoring system - uses capacitive coupling between rotary sensor and stationary evaluation device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH118890A CH680389A5 (en) | 1990-04-09 | 1990-04-09 | Grinding disc noise monitoring system - uses capacitive coupling between rotary sensor and stationary evaluation device |
Publications (1)
Publication Number | Publication Date |
---|---|
CH680389A5 true CH680389A5 (en) | 1992-08-14 |
Family
ID=4204562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH118890A CH680389A5 (en) | 1990-04-09 | 1990-04-09 | Grinding disc noise monitoring system - uses capacitive coupling between rotary sensor and stationary evaluation device |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH680389A5 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1574830A1 (en) * | 2004-03-08 | 2005-09-14 | BALANCE SYSTEMS S.p.A. | Precision sensor assembly for rotating members in a machine tool |
CN113103076A (en) * | 2021-04-13 | 2021-07-13 | 霖鼎光学(上海)有限公司 | Wafer polishing device based on inductively coupled plasma |
WO2023246968A1 (en) * | 2022-06-22 | 2023-12-28 | Schaeffler Technologies AG & Co. KG | Apparatus for recording measured values in a machine and for contactlessly transmitting signals, and machine assembly having this apparatus |
-
1990
- 1990-04-09 CH CH118890A patent/CH680389A5/en not_active IP Right Cessation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1574830A1 (en) * | 2004-03-08 | 2005-09-14 | BALANCE SYSTEMS S.p.A. | Precision sensor assembly for rotating members in a machine tool |
US7357031B2 (en) | 2004-03-08 | 2008-04-15 | Balance Systems S.R.L. | Precision sensor assembly for rotating members in a machine tool |
CN113103076A (en) * | 2021-04-13 | 2021-07-13 | 霖鼎光学(上海)有限公司 | Wafer polishing device based on inductively coupled plasma |
WO2023246968A1 (en) * | 2022-06-22 | 2023-12-28 | Schaeffler Technologies AG & Co. KG | Apparatus for recording measured values in a machine and for contactlessly transmitting signals, and machine assembly having this apparatus |
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