{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-E67V8UQL/0d1aba62-b3e8-4792-967c-5b7ba7f5555d/PDF","dcterms:extent":"1081 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-E67V8UQL/4945bfa0-5ff7-44dc-8c72-a4c35f98e92f/TEXT","dcterms:extent":"47 KB"}],"edm:TimeSpan":{"@rdf:about":"1999-2025","edm:begin":{"@xml:lang":"en","#text":"1999"},"edm:end":{"@xml:lang":"en","#text":"2025"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:doc-E67V8UQL","dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:spr-6QOUKQ9A"},{"@xml:lang":"sl","#text":"Strojniški vestnik"}],"dcterms:issued":"2017","dc:creator":["Horváth, Richárd","Lukács, Judit"],"dc:format":[{"@xml:lang":"sl","#text":"letnik:63"},{"@xml:lang":"sl","#text":"številka:9"},{"@xml:lang":"sl","#text":"str. 489-500"}],"dc:identifier":["ISSN:0039-2480","COBISSID_HOST:15662107","URN:URN:NBN:SI:doc-E67V8UQL"],"dc:language":"en","dc:publisher":{"@xml:lang":"sl","#text":"Zveza strojnih inženirjev in tehnikov Slovenije etc."},"dc:subject":[{"@xml:lang":"sl","#text":"avstenitno nerjavno jeklo"},{"@xml:lang":"sl","#text":"evtektična aluminijeva zlitina za tlačno litje"},{"@xml:lang":"sl","#text":"merjenje sil"},{"@xml:lang":"sl","#text":"model sil"},{"@xml:lang":"sl","#text":"natančno struženje"},{"@xml:lang":"sl","#text":"nelegirano jeklo"},{"@xml:lang":"sl","#text":"specifična rezalna sila"}],"dcterms:temporal":{"@rdf:resource":"1999-2025"},"dc:title":{"@xml:lang":"sl","#text":"Application of a force model adapted for the precise turning of various metallic materials|"},"dc:description":[{"@xml:lang":"sl","#text":"The knowledge of cutting forces is critical. They might affect the load of the machine and, in the case of fine turning, the deformation of thin and slim workpieces. The generated forces depend not only on material properties (hardness, tensile strength) and on cutting parameters, but also on the tool edge geometry, that strongly determines the geometry of the chip (thickness and width). This article deals with the application of a force model adapted for precise turning technology. Three different types of materials widely used in mass production were taken into consideration (C45 and KO36 steel types and AS12 die-cast aluminium alloy). The components of cutting force were measured in three directions (Fc, Ff, Fp) and the specific cutting forces were calculated. The main values of specific cutting forces were introduced for precision turning (k1,0,1); using this, a new force model was constructed based on the theoretical parameters of the non-deformed chip cross-section (h eq is equivalent chip thickness and l eff effective length of the edge of the tool) in case of all three examined materials. Investigations revealed that the influence of l eff on specific cutting force components is not negligible; however, it has the least effect on k c and is the most influential in case of k p . The errors of the constructed new force models follow Gaussian distribution with low values of standard deviation. Thereby, the models can be applied to estimate cutting force components during the technological process planning procedure with adequate accuracy"},{"@xml:lang":"sl","#text":"Rezalne sile so zelo pomembne, saj vplivajo na obremenitve stroja, pri natančnem struženju pa lahko povzročijo deformacije tankih oz. vitkih obdelovancev. Nastale sile niso odvisne samo od lastnosti materiala (trdota, natezna trdnost itd.) in od rezalnih parametrov (vc - rezalna hitrost, m/min; fp -podajanje, mm; ap - globina reza, mm), temveč tudi od geometrije rezalnega roba orodja, ki opredeljuje geometrijo odrezka (debelino in širino). Članek obravnava uporabo prilagojenega modela sil pri tehnologiji natančnega struženja, kjer ima pri oblikovanju odrezkov glavno vlogo polmer vrha orodja. Meje parametrov natančnega struženja, znotraj katerega so bile opravljene preiskave, so bile: ap = 0,25 do 0,7 mm; f = 0,03 do 0,15 mm. Obravnavani so bili trije različni materiali, ki so razširjeni v množični proizvodnji (nelegirano jeklo C45, avstenitno nerjavno jeklo KO36 in evtektična aluminijeva zlitina za tlačno litje AS12). Izmerjene so bile komponente rezalne sile v treh smereh ( Fc - glavna rezalna sila, N; Ff - podajalna sila, N; Fp - potisna sila, N) in specifične rezalne sile. Običajni geometrijski parametri ( h - debelina odrezka, mm in b - širina odrezka, mm) niso primerni za karakterizacijo preseka nedeformiranega odrezka pri natančnem struženju, saj pri oblikovanju odrezka deluje predvsem zaokroženi vrh. Zato sta bila uvedena nova parametra geometrije: heq - ekvivalentna debelina odrezka, mm, in leff - efektivna dolžina roba orodja, mm. Za natančno struženje so bile uvedene nove vrednosti specifične rezalne sile (k 1,0,1 , N/mm2), s pomočjo katerih je bil zasnovan nov model sile na podlagi novih teoretičnih parametrov preseka nedeformiranega odrezka za vse tri materiale. Novi model sile s teoretičnimi parametri preseka nedeformiranega odrezka (heq in leff) pri vseh preiskovanih materialih omogoča ocenjevanje komponent prostorskih sil (Fc, Ff, Fp). Izkazalo se je, da so specifične rezalne sile pri vseh treh komponentah močno odvisne od vrednosti l eff in niso samo funkcija h eq (učinek je najmanj izražen pri kc in najbolj izražen pri kp ). V model specifičnih rezalnih sil je zato treba vključiti oba geometrijska parametra kljub Kienzle-Victorjevi enačbi (v primeru večjega preseka odrezka). Napake novega modela sil sledijo Gaussovi porazdelitvi z majhno vrednostjo standardne deviacije pri vseh materialih. Model, ki je prilagojen silam pri natančnem struženju, je mogoče uporabiti tudi pri materialih s tehnološko bistveno drugačnimi lastnostmi. Uporabnost enačb tako ni odvisna od materiala obdelovanca in modeli so primerni za ustrezno natančno ocenjevanje komponent rezalne sile v procesu načrtovanja tehnologije"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:doc-E67V8UQL","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:doc-E67V8UQL"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:doc-E67V8UQL/0d1aba62-b3e8-4792-967c-5b7ba7f5555d/PDF"},"edm:rights":{"@rdf:resource":"http://rightsstatements.org/vocab/InC/1.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Univerza v Ljubljani, Fakulteta za strojništvo"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:doc-E67V8UQL/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:doc-E67V8UQL"}}}}