Metodologija vrednotenja površin po graviranju z AVC

magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo

Arjan Hmeljak (Author), Andrej Lebar (Mentor), Joško Valentinčič (Co-mentor)

Abstract

Rezanje z abrazivnim vodnim curkom (AVC) je vsestransko uporabljen postopek konturnega rezanja. Visok tlak pospeši vodni curek skozi ozko šobo, kjer mu primešamo abrazivna zrna. Zaradi visoke hitrosti in masnega doprinosa abrazivnih delcev dobimo curek z visoko kinetično energijo, kar odnaša material obdelovanca. Pri rezanju smo omejeni z debelino obdelovanca, ki je odvisna od moči samega curka. Za ta postopek je značilen pojav valovitosti, zlasti v spodnjem delu reza, ki je nezaželen, saj nam kvari geometrijo obdelovanca. V delu smo pregledali literaturo, povezano z značilnimi pojavi na površini obdelovancev po rezanju z AVC. V eksperimentalnem delu smo preučili vpliv masnega pretoka abraziva in podajalne hitrosti na značilnosti dobljene površine po graviranju z AVC ter iskali povezavo z nastajanjem valovitosti reza. Poskuse smo opravili na aluminijevi zlitini 5083. Globine gravur smo omejili na maksimalno 3 mm, kjer smo si pomagali z Zengovo enačbo za izračun teoretičnih globin reza. Eksponente te enačbe smo uspešno prilagodili in dosegli natančnejše napovedovanje globine graviranja. Rezultate smo vrednotili s pomočjo grafov močnostnega spektra, ter ugotovili, da se za izbrane parametre v razponu podajanja od 500 do 900 mm/min ter masnega pretoka od 12 do 48 g/min, nastanek valovitosti še ne pokaže.

Keywords

magistrske naloge;abrazivni vodni curek;graviranje;površina;hrapavosti;frekvence;Zengova enačba;

Data

Language:	Slovenian
Year of publishing:	2019
Typology:	2.09 - Master's Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[A. Hmeljak]
UDC:	621.9.048:62-4(043.2)
COBISS:	16677403
Views:	883
Downloads:	232
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Methodology of surface evaluation after engraving with AWJ
Secondary abstract:	Abrasive water jet cutting (AWJ) is a versatile contour cutting process. High pressure accelerates the water jet through a narrow nozzle, where it is mixed with abrasive grains. Due to the high velocity and mass contribution of the abrasive particles, a high-kinetic energy jet is obtained, which erodes workpiece material. When cutting, we are limited by the thickness of the workpiece, which depends on the power of the jet itself. This process is characterized by an occurrence of waveform, especially in the lower part of the cut, which is undesirable, since it negatively impacts on the geometry of the workpiece. We reviewed literature related to the typical phenomena on the surface of the workpieces after cutting with the AWJ. In the experimental part we studied the influence of the abrasive mass flow rate and the feed speed rate on the characteristics of the surface after engraving with the AWJ and sought a connection with the formation of the waviness. Experiments were done on aluminum alloy 5083. The depth of the engraving was limited to a maximum of 3 mm, the Zeng's equation was used to calculate the theoretical depths of the cut. The exponents of this equation were successfully adapted and more precise forecast of the depth for the engraving was achived. The results were evaluated using graphs of the power spectrum. It has been found that for the selected parameters in the feed speed range from 500 to 900 mm/min and mass flow rate from 12 to 48 g/min, there is no formation of waviness yet.
Secondary keywords:	abrasive water jet;engraving;surface;roughness;frequencies;Zeng's equation;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. Ljubljana, Fak. za strojništvo
Pages:	XXII, 81 str.
ID:	11162480