Analysis of critical process parameters of ductile mode grinding of brittle materials

Oliver Faehnle; Marius Doetz; Olaf Dambon

doi:10.1515/aot-2017-0045

Article

Analysis of critical process parameters of ductile mode grinding of brittle materials

Oliver Faehnle , Marius Doetz and Olaf Dambon

Published/Copyright: August 25, 2017

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From the journal Advanced Optical Technologies Volume 6 Issue 5

Abstract

The process of ductile mode grinding has been analyzed experimentally. Besides the traditional approach, controlling the depth of a cut on feed-controlled ultra-precision machines (UPMs), two alternative approaches have been tested. By applying fluid jet polishing (FJP) using a grinding slurry, a stable ductile mode grinding could be set up. Subsequently, loose abrasive grinding processes on load-controlled traditional spindle machines have been tested to be suited for ductile mode grinding identifying the dependence of crack initiation on the type of slurry fluid being applied. In that way, substantially improved levels of surface roughness could be achieved, although local brittle cracking within the generated clear apertures still remained. Furthermore, critical process parameters were identified determining the process window of feed-controlled ductile grinding applied on state-of-the-art UPM machineries. These have been analyzed experimentally, and it was found that the critical depth of a cut significantly depends on the set of critical process parameters being applied. Finally, the critical ductile grinding process parameters could be identified determining the generated level of surface roughness achieving 0.83 nm Ra on tungsten carbide.

Keywords: ductile grinding; fluid jet polishing (FJP); SPDT; ultra-precision machining (UPM)

References

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Received: 2017-6-9

Accepted: 2017-7-14

Published Online: 2017-8-25

Published in Print: 2017-10-26

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Articles in the same Issue

https://doi.org/10.1515/aot-2017-0045

Keywords for this article

ductile grinding; fluid jet polishing (FJP); SPDT; ultra-precision machining (UPM)