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Vpliv tehnoloških parametrov struženja na temperaturo rezila : diplomsko delo (visokošolski strokovni študij)
Vidic, Drago (Author), Bučar, Bojan (Mentor) More about this mentor... This link opens in a new window, Medič, Marijan (Reviewer)

URLURL - Presentation file, Visit http://www.digitalna-knjiznica.bf.uni-lj.si/vs_vidic_drago.pdf New window

Abstract
Toplotne razmere v postopkih odrezovanja so za boljše razumevanje dogajanja v deformacijskem območju rezil bistvenega pomena. Izvora toplotnih tokov sta 2 in sicer notranje trenje v deformirajočem se materialu ter trenje, ki nastaja med odrezkom, obdelovancem in rezilom. Kadar imamo opraviti z organskimi materiali, je delež notranjega trenja v deformirajočem se materialu praktično zanemarljiv, kar pomeni, da je vsa toplota, ki se v deformacijskem območju rezila razvije, posledica tornih razmer med odrezkom, obdelovancem in rezilom. V postopku struženja smo opazovali vpliv tehnoloških in materialnih parametrov na temperaturo rezila. Temperaturo orodja smo merili s termočlenom, vstavljenim pod rezilno ploščico. Meritve smo opravili pri različnih podajalnih hitrostih, odvzemih in vlažnostih lesa, pri neprekinjenem in intermitenčnem struženju. Rezultati opravljenih analiz kažejo, da naraščajoča podajalna hitrost in globina odrezovanja povzročata povečanje toplotnih tokov oziroma dvig temperature orodja. Vlažnost obdelovancev ima v vseh primerih na temperaturo negativen vpliv. Pri intermitenčnem odrezovanju smo zasledili nižje temperature stružnega orodja.Toplotni tok je v neposredni povezavi z velikostjo rezalne sile.

Language:Slovenian
Keywords:temperatura rezila, struženje, intermitenčno odrezovanje
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2005
Publisher:[D. Vidic]
Number of pages:XIII, 55 f., [40 f. pril.]
Place:Ljubljana
UDC:621.941:630*823.5
COBISS.SI-ID:1271177 Link is opened in a new window
Views:510
Downloads:115
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Secondary language

Language:English
Abstract:
Conditions regarding heat generation in the process of cutting are of vital importance for better understanding of the activity going on in the deformation area of a tool. There are 2 sources of heat in this deformation area, namely internal friction arising from a deformational process of a material, and the friction emerging between a chip, workpiece and tool. Duringthe machining pof organic materials, the portion of internal friction ispractically negligible. That means that entire heat emerging in the deformation area of the tool represents a result of the friction between a chip, workpiece and tool. The influence of technological and material parameters on heat generation in a process of turning was surveyed. The temperature of the tool was measured by a thermocouple set under the cutting insert. The measurements were carried out at different feed rates, depths of cut and moisture contents. The research was carried out at continuous and intermitted turning. The results of the analyses show that the increase in feed rate and depth of cut cause increase in heat generation and temperature. Under all circumstances, humidity of the workpiece negatively influences heat generation. In the case of intermitted turning, lower tool temperature was noticed, as a result of decrease in heat generation. The results show that heat is in a direct correlation with the magnitude of the cutting force.


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