EXTENDING METALWORKING EMULSIONS’ SERVICE LIFE BY PREVENTIVE MAINTENANCE

Sažetak Tijekom procesa obradbe metala odvajanjem čestica tekućina za hla|enje i podmazivanje izložena je kontinuiranom zagađenju. To su u prvom redu čestice metala i alata a zatim “strano” ulje (s kliznih staza, hidraulička ulja, zaštitna ulja i dr.). Razvoj mikroorganizama i kakvoća vode za spravljanje emulzija uzrokuje dodatne probleme. Zaga|enja znatno skraćuju radni vijek emulzije, povećavaju materijalne troškove, troškove rješavanja otpada a uzrokuju i zastoj u proizvodnji. Stoga ih valja ukloniti održavanjem: korektivnim, prediktivnim ili preventivnim zahvatima. Izbor sustava opskrbljivanja obradbenih strojeva tekućinom je bitan za produženje radnog vijeka emulzije. U strojevima s centralnim sustavom u odnosu na individualni sustav radni vijek emulzije približno je dvostruk i to bez posebne njege. Radni vijek emulzije može se produžiti ugradnjom elemenata, primjerice, zaslona, centrifuga, separatora, filtara, skimera i sl. Proizvo|a~i maziva imaju zna~ajnu ulogu u produ`enju radnog vijeka teku}ine. To je prvenstveno proizvodnja teku}ina sa {to boljom stabilno{}u. Zatim, davanje preporuka za izbor teku}ine s ve}om biostabilno{}u, ~i{}enje sustava, njegu emulzije tijekom primjene, njegu ljudi, strojeva i pogona. Produ`enjem radnog vijeka teku}ina za hla|enje i podmazivanje pove}ava se produktivnost, {titi okoli{ i kona~no pobolj{ava ukupno gospodarenje teku}inama.Abstract During metalworking operations through particle separation, the fluid for cooling and lubrication is exposed to continuous contamination. These are primarily metal and tool particles, and also “tramp” oil (from slideways; hydraulic, anticorrosion oils, etc.). Microorganism growth and water quality for emulsion mixing causes additional problems. The contamination considerably reduces the emulsion’s service life, increases material and waste disposal costs, and also causes production standstills. That is why it needs to be eliminated through maintenance: Corrective, predictive, or preventive intervention. The choice of the system for the supply of metalworking machines with fluid is of importance for extending the emulsion’s service life. Machines with a central system have twice longer emulsion service life than individual systems, and without any special care. The emulsion’s service life may be extended by building in elements such as walls, centrifuges, separators, filters, skimmers, and the like. Lubricant manufacturers play an important role in extending the fluid’s service life. This primarily concerns the production of fluids with as high stability as possible, but also recommendations for the choice of a fluid with higher biostability, system cleaning, emulsion maintenance during application, and the care for people, machinery and plant. The extension of the service life of cooling and lubricating fluids increases productivity, protects the environment, and finally improves overall fluid management. The paper presents the results of applying machines for preventive maintenance of working emulsions. The test results of working emulsion properties have shown that contamination may successfully be removed and the emulsion’s service life extended