Vrednotenje površin po graviranju z AVC

magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo

Žiga Miklavec (Avtor), Andrej Lebar (Mentor), Joško Valentinčič (Komentor)

Povzetek

Proces obdelave z abrazivnim vodnim curkom (AVC) spada med konturne postopke rezanja, pri katerem visokohitrostnemu vodnemu curku dodajamo abrazivna zrna. Voda skupaj z abrazivom udarja ob obdelovanec, pri čemer odnaša material. Rezalni postopek je primeren za obdelavo različnih materialov, med drugim kovin, kamna, stekla in organskih materialov, brez prisotnosti toplotno vplivanega območja. Kljub dobrim lastnostim postopka obdelave največjo slabost predstavlja manjša natančnost rezanja. Ena izmed tipičnih značilnosti obdelave pri rezanju z AVC je nastanek brazdavosti površine. V delu smo opravili pregled literature v povezavi z značilnimi pojavi na površini materiala po rezanju z AVC. V eksperimentalnem delu naloge smo na obdelovani stroj za rezanje z AVC namestili dozirni sistem z vrtečim se kolesom, ki dovaja abraziv v mešalno komoro rezalne glave ter z njim opravili graviranje materiala. Z namenom iskanja morebitnih povezav za nastanek brazdavosti na površini obdelovanca smo v aluminijevo zlitino in konstrukcijsko pločevino naredili gravure globin do nekaj milimetrov, pri čemer smo globino reza povečevali s spreminjanjem nastavitvenih parametrov obdelave. Z digitalnim mikroskopom smo analizirali topografijo površin gravur ter z obdelavo podatkov rezultate ovrednotili. Rezultate smo prikazali s pomočjo grafov moči spektralne gostote. Ugotovili smo, da moč spektralne gostote narašča pri določenih frekvencah, ki so posledica večanja globine reza.

Ključne besede

magistrske naloge;abrazivni vodni curek;brazdavost površine;dozirni sistemi;frekvence;masni pretoki;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2019
Tipologija:	2.09 - Magistrsko delo
Organizacija:	UL FS - Fakulteta za strojništvo
Založnik:	[Ž. Miklavec]
UDK:	621.9.048:62-4(043.2)
COBISS:	16922139
Št. ogledov:	1423
Št. prenosov:	199
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Evaluation of surface after engraving with AWJ
Sekundarni povzetek:	The abrasive water jet cutting process (AWJ) is one of the contour cutting processes in which abrasive grains are added to the high-speed water jet. Water, along with the abrasive, hits the workpiece, which removes material. The cutting process is suitable for the treatment of various materials, including metals, stone, glass and organic materials, without the presence of a heat-affected area. Despite the good features of the machining process, the greatest disadvantage is the lower cutting accuracy. One of the typical features of machining when cutting with AWJ is the stria formation. In this work we have reviewed the literature in relation to the characteristic phenomena on the surface of the material after cutting with AWJ. In the experimental part of the work, an abrasive dosing system with a rotating wheel was installed on the AWJ cutting machine, which feeds the abrasive into the mixing chamber of the cutting head. With mentioned dosing system we engraved the material. In order to find possible connections for the formation of stria on the surface of the workpiece, we made engravings of depths of up to several millimeters in aluminium alloy and structural steel, increasing the cutting depth by changing the machining parameters. Using digital microscope, we analyzed the topography of the engraving surfaces and evaluated the results by processing the data. The results were plotted using spectral density power graphs. We find that the power of the spectral density increases at certain frequencies, which is the result of increasing the depth of the cut.
Sekundarne ključne besede:	master thesis;abrasive water jet;stria formation;dosing systems;frequencies;mass flow;
Vrsta dela (COBISS):	Magistrsko delo/naloga
Študijski program:	0
Konec prepovedi (OpenAIRE):	1970-01-01
Komentar na gradivo:	Univ. Ljubljana, Fak. za strojništvo
Strani:	XXIV, 80 str.
ID:	11217217