Browsing by Author "Kaller, Adolf"
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- ItemAnpassung der Eigenschaften der Ceroxid-Poliermittel auf die Polierbedingungen von Glasoberflächen in Abhängigkeit von deren Präzisionsgrad(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 2001) Kaller, AdolfFür die Herstellung polierter Flächen von optischen Gläsern werden die Scherbeanspruchungen der (z.B. auf CeO2 basierenden) Polierkörner, je nach der Präzision der zu polierenden Flächen, in einer Scherbeanspruchungsbreite von mindestens fünf Zehnerpotenzen eingesetzt. Daraus folgt, daß die jeweiligen Randabriebsfähigkeiten der Polierkörner sehr genau auf die jeweiligen Scherbeanspruchungsbereiche abgestimmt werden müssen. Im vorliegenden Beitrag wird über die Eigenschaften der CeO2-Poliermittel berichtet, und zwar für die Einsatzbereiche mit sehr hohen Scherbeanspruchungen der Polierkörner zur Herstellung von polierten Oberflächen mit geringer Präzision, z.B. von Brillen-Gläsern, bis hin zu Einsatzbereichen mit geringen Scherbeanspruchungen für die Herstellung polierter Oberflächen mit höchster Präzision nach dem Prinzip des computergesteuerten Korrigierpolierens.
- ItemDissertation on the polishing of spherical objects by S. Hambücker - Α critical review(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 2003) Kaller, Adolf[no abstract available]
- ItemOn the polishing of glass, particularly the precision polishing of optical surfaces(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1991) Kaller, AdolfIn this survey, the views on the mechanism of the polishing of glass to be found in the literature are only dealt with briefly, because extensive summarizing evaluations of reports dealing with the problem are available. The main objective of this paper is the investigation of the causes of hitherto differing views on the processes occurring during the polishing of glass, despite the extensive literature which exists in over 500 publications. The causes for the differing interpretations of the polishing mechanisms result from an incorrect evaluation of the properties of the polishing compounds and of the polishing parameters during precision polishing. Therefrom and from the author's long-term investigations of the properties of model polishing compounds and of the polishing processes with these model polishing compounds under optical production conditions a generally valid theory of the polishing of optical media was developed. This idea — named "tribochemical friction-wear polishing theory" — is totally different from hypotheses presented up to now. The present paper tries to verify the correctness of the new theory.
- ItemProperties of polishing media for precision optics(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1998) Kaller, AdolfThe first theory concerning the pohshing of glass, which viewed polishing as an extension of the grinding process with finer abrasives, and the flow theory of Beilby, both stipulate purely hypothetically that the polishing grains should have a very high hardness. This hypothesis of high hardness of the polishing grains was so strongly supported by Smekal and Brüche in the 40's and 50's and by other scientists in the following years that it became dogma, i.e., a claim without proof, and has remained virtually universally accepted to this day. The results of the investigations of the present author have shown, however, that first, extra lattice defects in the crystalline oxides used as polishing agents are the primary characteristics that are responsible for the gripping of the grains during polishing and second, the hardness of the grains of the polishing agent must be lower than that of the material which is being polished. By and large these results have been ignored in the literature, because they are in Opposition to the dogma that the polishing agent must have a high hardness. Clear proof is presented in this paper that disproves the generally accepted hypothesis that polishing can be done with very fine grinding powder, and that the polishing agent must be harder than the glass which is to be polished. The properties of polishing agents for use in polishing for precision optics will be described on the basis of the theory of polishing agents containing lattice defects.