Globoko vrtanje v orodjarstvu z uporabo topovksih svedrov

Dekleva, David (author), Pušavec, Franci (mentor), Kopač, Janez (co-mentor)

V želji po avtomatizaciji postopka globokega vrtanja moramo poznati obstojnost orodja, ki služi za potrebe globokega vrtanja, zato smo v diplomskem delu pregledali, kako mehanske lastnosti obdelovanega materiala vplivajo na obstojnost orodja. Ker svedre za globoko vrtanje brusimo v podjetju na namenskem stroju, smo v diplomski nalogi naredili tudi analizo vpliva širine proste ploskve na obstojnost orodja. Pri manjših premerih izvrtin je prihajalo do težave, da se izvrtine niso križale, zato je v nalogi opravljena analiza osnega odstopanja, preverili pa smo tudi glavne razloge za preveliko osno odstopanje. Za meritve obrabe in osnega odstopanja je bil uporabljen računalniški program ImageJ. Z izdelavo točnejše pilotne izvrtine se je osno odstopanje z 0,766 mm zmanjšalo na 0,420 mm, merjeno na dolžini 407 mm. Obstojnost orodja se je pri obdelovalnem materialu z boljšimi mehanskimi lastnostmi skrajšala za 50 %, pri večanju širine proste ploskve pa se je obstojnost orodja s prvotnih 262,500 min podaljšala na 332,283 min.

• Language: Slovenian
• Keywords: globoko vrtanje, topovski sveder, obstojnost orodja, parametri rezanja, obraba zunanjega roba, osno odstopanje izvrtine
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [D. Dekleva]
• Year: 2018
• Number of pages: XXII, 56 str.
• PID: 20.500.12556/RUL-101717
• UDC: 007.52:621.941(043.2)
• COBISS.SI-ID: 16128283
• Publication date in RUL: 30.06.2018

Secondary language

• Language: English
• Title: Deep hole drilling in tooling using gun drills

Abstract

In order to automate the deep drilling process, we have to know the durability of a tool that serves the needs of deep drilling. Therefore, in the diploma thesis, an overview is made of how the mechanical properties of the treated material influence the stability of the tool. As the drill bits for deep drilling are drilled in the company on a purpose-made machine, the diploma thesis also analyses how the width of the free surface affects the stability of the tool. At smaller diameters of the bores, there was a problem that the bores did not cross, therefore the axis deviation analysis was performed in the task and we also examined the main reasons for the excessive axis deviation. The ImageJ computer program was used for measurements of the wear and axis deviation. By making a more accurate pilot bore, the axis deviation was reduced from 0.766 mm to 0.420 mm, at a length of 407 mm. The strength of the tool has shortened by 50 % for materials with better mechanical properties. In increasing the width of the free surface, the tool's stability prolonged from original 262.500 min to 332,283 min.

• Keywords: deep hole drilling, gun drill, tool durability, cutting parameters, wearing outer edge, bore axis deviation