Optimizacija parametrov frezanja za izboljšanje kakovosti obdelane površine aluminijastih ulitkov

diplomsko delo Visokošolskega strokovnega študijskega programa I. stopnje Strojništvo

Simon Šter (Author), Davorin Kramar (Mentor)

Abstract

V obstoječem proizvodnem procesu se pojavi problem valovitosti na obdelani površini aluminijastih ulitkov, kar predstavlja neskladnost z zasnovo izdelka. Valovitost na obdelani površini je posledica vibracij med obdelovalnim postopkom, ki se z obrabo orodja stopnjuje, saj so uporabljena orodja neodporna na vibracije. Namen dela je bil z metodo SPC analizirati obstoječe stanje proizvodnega procesa in nato z uporabo metode DOE določiti najbolj optimalne obdelovalne parametre pri katerih so vibracije najmanjše. Zajem vzorcev za analizo SPC je bil neposreden z obstoječega proizvodnega procesa. Za analizo pa so se uporabili rezultati pridobljeni na podlagi rednega merilnega protokola. S to metodo je bil proces spoznan za stabilnega, kljub temu pa je bila prisotna valovitost na obdelani površini. S pomočjo metode DOE smo, z relativno majhnim številom preizkusov našli najbolj ustrezne parametre za odpravo vibracij. Obravnavni so bili trije parametri, in sicer, število vrtljajev obdelovalnega orodja, hitrost podajanja ter vpenjalni tlak, ki regulira silo vpenjanja obdelovanca na vpenjalno pripravo. Ugotovljeno je bilo, da je tlak najvplivnejši, hitrost podajanja pa nima nikakršnega vpliva na kakovost obdelane površine.

Keywords

diplomske naloge;frezanje;obdelava;aluminijasti ulitki;metoda SPC;metoda DOE;vzorci;valovitost;

Data

Language:	Slovenian
Year of publishing:	2019
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[S. Šter]
UDC:	621.914:658.5(043.2)
COBISS:	16661275
Views:	1022
Downloads:	139
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Milling parameter optimisation for greater quality of aluminium casts machined surface
Secondary abstract:	In the existing production process, the problem of chatter marks occurs on the machined surface of aluminum castings, which represents incompatibilitiy with the design of the product. The chatter marks appears due to vibration during the machining process, which increases the wear of the tool, since the tools used are not resistant to vibrations. The purpose of the work was to analyze the existing state of the production process using the SPC method, and then use the DOE method to determine the most optimal machining parameters for which the vibrations are the smallest. Sampling for the SPC analysis was direct from the existing production process. The results obtained on the basis of a regular measurement protocol were used for analysis. With this method, the process was recognized as stable, however, chatter marks were still present. With the help of the DOE method, using relatively small number of experiments we found the most appropriate parameters for eliminating vibrations. Three parameters were considered, namely, the number of revolutions of the machining tool, the feed rate and the clamping pressure, which regulates the clamping force of the workpiece to the clamping device. It was found that the pressure is the most influential and the feed rate has no influence on the quality of the treated surface.
Secondary keywords:	machining;aluminum;SPC method;DOE method;samples;chatter;
Type (COBISS):	Bachelor thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	2020-06-10
Thesis comment:	Univ. v Ljubljani, Fak. za strojništvo
Pages:	XXI, 60 str.
ID:	11157400