DieErfindung betrifft eine Vorrichtung zur Abbildung der Innenflächeeines vorzugsweise zylindrischen Hohlraums in einem Werkstück,mit einer Optik mit Rundumblick von vorzugsweise 360°,mit Mitteln zum schrittweisen Vorschub der Optik senkrecht zur Ebenedes Rundumblicks, mit einer digitalen Kamera mit einer ebenen Bildaufnahmefläche, aufder das von der Optik aufgenommene Rundumbild abgebildet wird, undmit Mitteln, die aus den digitalen Ausgangssignalen der Kamera einkarthesisches Bild erzeugen, das eine Abwicklung der Innenflächedes Hohlraums ist.TheThe invention relates to a device for imaging the inner surfacea preferably cylindrical cavity in a workpiece,with a 360 ° view, preferably 360 °,with means for incrementally advancing the optics perpendicular to the planeof the all-round view, with a digital camera with a flat image-taking surfacethe image captured by the optics is imaged, andwith means coming from the digital output signals of the cameraCartesian image, which is a development of the inner surfaceof the cavity is.
Einederartige Vorrichtung ist durch
DieAbbildung einer Innenfläche eines zylindri schen Hohlraumsin einem Werkstück dient dem Ziel, die Oberflächeauf Fehler zu untersuchen und fehlerhafte Bauteile auszuscheiden.Dies ist besonders in der Automobilindustrie von Bedeutung, wo funktionsrelevanteBohrungen seriengefertigt werden, beispielsweise bei Bremszylindern,Bremssätteln, Pleueln, Kolben, Motorzylindern, Zylinderlaufbuchsenoder Lagerbuchsen. Eine solche Prüfung erfolgte bisherdurch visuelle Inspektion und natürlich behaftet mit denEinschränkungen der Sichtkontrolle. Anzustreben ist jedocheine Stück-für-Stück-Prüfung beigleichzeitiger Automatisierung des Prüfvorganges. Einesolche Prüfung ist mit der genannten bekannten Vorrichtungnicht möglich.TheIllustration of an inner surface of a cylindri's cavityin a workpiece serves the target, the surfaceto investigate faults and eliminate defective components.This is particularly important in the automotive industry, where functionally relevantHoles are mass-produced, for example in brake cylinders,Brake calipers, connecting rods, pistons, engine cylinders, cylinder linersor bushings. Such a test has been done so farthrough visual inspection and of course afflicted with theLimitations of visual inspection. However, it is desirablea piece-by-piece check atSimultaneous automation of the inspection process. ASuch testing is with the known device mentionednot possible.
DerErfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung derim Oberbegriff des Anspruchs 1 genannten Art zu schaffen, bei derdie Zeit für die Prüfung so gering ist, daß eine Stück-für-Stück-Prüfung,insbesondere eine automatische Prüfung erfolgen kann.Of theInvention is therefore based on the object, a device ofto create in the preamble of claim 1 mentioned type, in thethe time for the exam is so small that a piece-by-piece exam,In particular, an automatic check can be made.
Dieder Erfindung zugrundeliegende Aufgabe wird durch die im Kennzeichendes Anspruchs 1 angegebene Lehre gelöst.TheThe problem underlying the invention is characterized by in the plateof claim 1 given teaching.
DerGrundgedanke der Erfindung besteht darin, daß der digitaleBildaufnehmer, der das von der Optik aufgenommene Rundumbild aufnimmt,nur Ausgangssignale entsprechend einer ringförmigen Linieauf der Innenfläche des Hohlraumes erzeugt, derart, daß dasAusgangssignal nur Informationen über diese ringförmigeLinie enthält. Dadurch ergibt sich eine beträchtlicheReduktion des Informationsinhalts. Diese reduzierten Ausgangssignalebilden dann den Bildinhalt der Zeilen des karthesischen Bildes,das im Ergebnis erzeugt wird. Durch den schrittweisen Vorschub derOptik werden jeweils neue Zeilen aneinandergereiht, so daß dasGesamtbild ent steht.Of theThe basic idea of the invention is that the digitalImage pick-up that captures the all-around image captured by the optics,only output signals corresponding to an annular linegenerated on the inner surface of the cavity, such that theOutput signal only information about this annularContains line. This results in a considerableReduction of information content. These reduced output signalsthen form the image content of the lines of the Cartesian image,which is generated in the result. By the gradual advance of theOptics each new lines are strung together, so that theEntire picture is ent.
DieErfindung macht sich die Tatsache zunutze, daß es inzwischendigitale Hochgeschwindigkeitsbildaufnehmer gibt, die in der Lagesind, 1.000 Bilder pro Sekunde aufzunehmen und entsprechende Bildsignalezu erzeugen. Dabei sind beliebige Auslesefenster programmierbar.Die Erfindung sieht nun vor, daß das Auslesefenster soprogrammiert ist, daß nur Ausgangssignale entsprechendeinem ringförmigen Band auf der Innenfläche desHohlraumes im wesentlichen quer zur Richtung des schrittweisen Vorschubsder Optik erzeugt werden, so daß eine Beschränkungder zu verarbeitenden Informationen bereits erfolgt mit der Folge,daß die nachfolgenden Verarbeitungseinheiten wesentlichschneller arbeiten können und somit in der Praxis eine Stück-für-Stück-Prüfungerfolgen kann.TheInvention takes advantage of the fact that it is nowDigital high-speed imagers are capable of thatare to take 1,000 frames per second and corresponding image signalsto create. Any read-out window can be programmed.The invention now provides that the readout window sois programmed that only output signals accordinglyan annular band on the inner surface of theCavity substantially transverse to the direction of the incremental feedthe optics are generated, so that a limitationthe information to be processed already occurs with the result thatthat the subsequent processing units essentialwork faster and thus in practice a piece-by-piece examinationcan be done.
Umdiese Stück-für-Stück-Prüfungtechnisch zu ermöglichen, sind gemäß einerWeiterbildung der Erfindung Mittel vorgesehen, die den Bildinhaltder Zeilen des karthesischen Bildes analysieren und die Ausgangssignalenur bei Überschreiten eines einstellbaren Grenzwertes zuden Mitteln zur Erzeugung eines karthesischen Bildes durchlassen.In optischer Hinsicht werden somit nur die Oberflächenfehlerdargestellt, wobei durch die Einstellung des Grenzwertes die Oberflächenfehlerbestimmt werden können, die zur Darstellung gelangen sollen.Natürlich ist es dann auch ohne weiteres möglich,diese Fehlersignale auszuwerten und die fehlerhaften Werkstücke entsprechendauszuscheiden oder zu markieren.Aroundthis piece-by-piece examtechnically possible, are in accordance with aFurther development of the invention means provided, the image contentanalyze the lines of the Cartesian image and the output signalsonly if an adjustable limit value is exceededlet through the means of producing a Cartesian image.In optical terms, therefore, only the surface defectsrepresented by the setting of the limit, the surface errorcan be determined, which should arrive at the presentation.Of course, then it is easily possible,evaluate these error signals and the faulty workpieces accordinglycancel or mark.
Gemäß derErfindung ist im Bereich der Optik eine Beleuchtungsquelle zur Rundumbeleuchtung festangeordnet. Dadurch erübrigt sich die Beleuchtung übereine von der Optik entfernt angeordnete Lichtquelle, deren Lichtbeispielsweise durch einen Lichtleiter geleitet wird. Vorzugsweiseist die Beleuchtungsquelle eine LED-Lichtquelle. Zweckmäßigerweiseist sie auch eine Laserdiode.According to theInvention is fixed in the field of optics, a lighting source for all-round lightingarranged. As a result, the lighting is unnecessary overa remote from the optic light source whose lightFor example, passed through a light guide. Preferablythe illumination source is an LED light source. Conveniently,she is also a laser diode.
Anhandder Zeichnung soll die Erfindung an einem Ausführungsbeispielnäher erläutert werden.Basedthe drawing, the invention of an embodimentbe explained in more detail.
DieVorrichtung gemäß
Anhandder Abwicklung
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Listeder vom Anmelder aufgeführten Dokumente wurde automatisierterzeugt und ist ausschließlich zur besseren Informationdes Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschenPatent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmtkeinerlei Haftung für etwaige Fehler oder Auslassungen.This listThe documents listed by the applicant have been automatedgenerated and is solely for better informationrecorded by the reader. The list is not part of the GermanPatent or utility model application. The DPMA takes overno liability for any errors or omissions.
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