Laser-induced deterioration grinding of zirconium oxide --priprava vzorca na vrhnji plasti in vrednotenje zmogljivosti

Laser-induced deterioration was proposed for the wet grinding of zirconium oxide (Zr[O.sub.2]) ceramic used in the dental, semiconductor and automotive industries. The mechanisms for laser induced deterioration and wet grinding of the deterioration layer were theoretically analysed, and the four key processing parameters that determine the micro-topography and distribution of the laser-induced crater were proposed, including the laser power density [I.sub.p], the defocus distance z, the laser spot overlap ratio [U.sub.s] and the laser scanning track line overlap ratio [U.sub.l]. Further, the forming mechanism of the single pulse-induced crater under different laser power densities, the defocus distance, and the interaction mechanisms between adjacent spots along the longitudinal and transverse directions were investigated. The optimal values of the key processing parameters were identified. To further evaluate the effect of laser-induced deterioration objectively, a comparative experiment was conducted under laser-induced deterioration wet grinding (LIDWG) and conventional grinding (CG) conditions. It was found that the procedure of laser-induced deterioration had a strong influence on the grinding results. The normal and tangential grinding forces for LIDWG condition were lower than for CG condition, with a maximum reduction of 59.2% (62.9%). Keywords: laser-induced crater, deterioration layer, wet grinding, grinding force, zirconium oxide Kljub vse vecjemu povprasevanju po izdelkih iz cirkonijevega dioksida je sirjenje uporabe omejeno zaradi majhnih stopenj odvzema materiala in visokih stroskov obdelave, ki presegajo 75% stroska komponente. Razresitev tezav, povezanih z natancnostjo in ucinkovitostjo obdelave keramike Zr[O.sub.2], je zato pomembna za proizvodno industrijo. Za tradicionalno lasersko podprto brusenje (LAG) so znacilne omejene moznosti uporabe hladilne tekocine in povrsinske/podpovrsinske razpoke, ki se tvorijo zaradi akumulacije toplote. Te tezave predstavljajo ozko grlo pri prakticni uporabi LAG in zato je predlagana nova strategija za lasersko pripravo povrsine keramike Zr[O.sub.2] na mokro brusenje (LIDWG). Cilj LIDWG je nadzorovano poskodovanje vrhnje plasti v enakomernih vzorcih kot priprava na visokoucinkovito brusenje. Proces LIDGW je sestavljen iz dveh razlicnih podprocesov: priprave in brusenja. Clanek obravnava nekatere kljucne parametre obdelave, ki dolocajo mikrotopografijo in porazdelitev luknjic po vrhnji plasti, in sicer na