Analiza obradljivosti hrastovine pri obimnom glodanju

Abstract

Istraživanja, sprovedena u okviru doktorske disertacije, odnose se na domen unapređivanja poznavanja karakteristika i funkcija obradljivosti hrasta lužnjaka (Quercus robur) pri obimnom glodanju. Osnovni cilj istraživanja je bio uspostavljanje metodologije za određivanje obradljivosti različitih vrsta drveća. Elementi obrade glodanjem koji su razmatrani u disertaciji su brzina pomoćnog kretanja i dubina rezanja. Ispitivanja su sprovedena za različite geometrije alata. Kriterijumi, na osnovu kojih je ocenjena obradljivost drveta, su snaga rezanja, sile rezanja i kvalitet obrađene površine (hrapavost i valovitost). Istraživanja su bila fokusirana na razvoj pouzdanog analitičkog i simulacionog modela za analizu i predikciju snage i sila rezanje, kao i kvaliteta obrađene površine pri uzdužnom glodanju, a na osnovu hipoteze da će različiti tehnološki parametri obrade uzrokovati i različitu potrebnu energiju za rezanje, kao i različit kvalitet obrađene površine pri istoj brzini rezanja. Za matematičko modeliranje, pri ispitivanju kriterijuma obradljivosti, korišćen je metod totalnih ortogonalnih eksperimentalnih planova. Razvijeni matematički model se koristi za određivanje zavisnosti parametara snage i sila rezanja, kao i kvaliteta obrađene površine u funkciji od režima rezanja i geometrije alata. Predloženi model se pokazao kao adekvatan i sa dovoljnom tačnošću opisuje zavisnosti ispitivanih kriterijuma obradljivosti od izabranih uticajnih faktora pri usvojenim uslovima ispitivanja. Model se može primeniti u praksi na odgovarajući realni proces obrade obimnim glodanjem i za područje variranih ulaznih faktora.

The research of this doctoral dissertation was conducted in the domain of improvement of the knowledge on the properties and functions characterizing the machinability of common oak (Quercus robur) wood during peripheral milling. The main aim of this research was to establish a methodology for determining the machinability of various tree species. The elements of milling considered in this thesis are feed rate and cutting depth. The investigations were carried out for a variety of tool geometries. The criteria for the assessment of the machinability of wood are cutting power, cutting forces and the quality of the processed surface (its roughness and waviness). The research focused on the development of a reliable analytical and simulation model for the analysis and prediction of the cutting power and cutting forces of longitudinal milling, as well as the quality of a surface processed by that machining operation. The basic hypothesis was that different technological parameters of processing result in different amounts of energy needed for cutting, as well as different surface qualities at the same cutting speed. The method of total orthogonal experimental plans was used as the mathematical model for the investigation of the machinability criteria. The developed mathematical model was used for determining the dependence of the parameters of cutting power, cutting forces and quality of the processed surface on the cutting regime and tool geometry. The proposed model proved to be adequate, as it describes the dependence of the examined machinability criteria on the selected impact factors with sufficient accuracy under the experimental conditions adopted in this research. In practice, this model can be applied to a corresponding real-world process of peripheral milling processing, as well as for varied input factors.