Abstract
The surface roughness is one of the most important parameters which determines the functional properties and quality of machined parts. For that reason, the aim of this study is to investigate the effect of machining parameters on the surface roughness for milling of biocompatible titanium alloy Ti6Al4V. In addition, optimization of cutting parameters was performed in order to achieve minimum surface roughness. The Taguchi method was used to find optimal values and analyze the effect of cutting parameters on the surface roughness. Three machining parameters, namely cutting speed, feed rate and depth of cut were observed in this paper. The analysis of the results reveal that the cutting speed has the biggest effect on the surface roughness for milling of biocompatible titanium alloy Ti6Al4V. Finally, a linear relationship between the observed cutting parameters and the surface roughness was determined.
Highlights
Za ovako postavljenu funkciju cilja prema Taguči metodi S/N za svaki eksperiment se računa uz pomoć obrasca (2): S⁄N = −10 × log (n1 ∑ni=1 yi2)
A linear relationship between the observed cutting parameters and the surface roughness was determined
Summary
Eksperimenti su izvedeni u uslovima suvog rezanja na troosnom vetikalnom obradnom centru za glodanje EMCO Concept Mill 450 sa SIEMENS Sinumerik 840D upravljačkom jedinicom. Hemijski sastav Ti6Al4V legure je dat u tabeli 1. U procesu obrade glodanjem, varirane su tri različite brzine rezanja (40, 80 i 160 m/min), tri različite vrijednosti pomaka (0.05, 0.1 i 0.2 mm/z) i tri različite dubine glodanja (0.5, 1.0 i 2.0). Kod izvođenja ovog eksperimenta kao izlazna vrijednost procesa obrade rezanja posmatrana je hrapavost obrađene površine. Za posmatranje hrapavosti obrađene površine najčešće se koristi srednja aritmetička vrijednost odstupanja, odnosno parametar Ra, pa se i u ovom radu analizirati uticaj režima obrade na vrijednost Ra. Od vrijednosti Ra direktno zavisi i klasa površinske hrapavosti. Hrapavost je mjerena tri puta na tri različita mjesta mjesta, pa je od tih izmjerenih vrijednosti za posmatranje uzeta srednja vrijednost Ra. Referentna dužina uzorkovanja je iznosila 2.5 mm, a pri obradi rezultata korišten je Gausov filter.
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