Masters Theses

Keywords and Phrases

Cryogenic cooling; Cutting forces; Machining parameters; Minimum Quantity Lubrication; Slot end-milling; Titanium alloy

Abstract

“Paper 1 presents the results of the investigations of the effects of cooling strategies [Emulsion cooling, Minimum Quantity Lubrication (MQL) and Liquid Nitrogen (LN2)] and machining parameters (feed rate and spindle speed) on cutting force components, cutting temperature and tool wear during slot end-milling of titanium Ti-6Al-4V workpiece. All machining experiments were conducted using four-flute 0.5 inch diameter uncoated solid carbide end-mill on Cincinnati Milacron, Sabre 750 vertical machining center equipped with Acramatic 2100 controller. Cutting force components were acquired and tool wear was indirectly measured from maximum cutting force variation per slot from the first pass to the eighth pass. The experimental results show that spindle speed and cooling strategies are the most significant factors that reduce cutting forces and tool wear, while cryogenic cooling, low spindle speed and high feed rate reduce cutting temperature. In paper 2, the results of the investigations on the effects of cooling strategies and machining parameters on surface roughness and residual stresses during slot end-milling of titanium alloy workpiece are presented. From the results obtained, combination of MQL and LN2 (MQL+LN2) was best in reducing surface roughness both on the web and on the rib. The combination of MQL and LN2 was the best in producing the most compressive residual stresses on the surface of the left rib while LN2 cooling strategy alone was the worst with high tensile residual stress on the surface of the left rib”--Abstract, page iv.

Advisor(s)

Okafor, A. Chukwujekwu (Anthony Chukwujekwu)

Committee Member(s)

Chandrashekhara, K.
Grow, David E.

Department(s)

Mechanical and Aerospace Engineering

Degree Name

M.S. in Mechanical Engineering

Comments

The financial support from the National Science Foundation (NSF) under grant no. CMMI 800871 and Intelligent Systems Center (ISC) of Missouri University of Science and Technology are gratefully acknowledged.

Research Center/Lab(s)

Intelligent Systems Center

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2013

Journal article titles appearing in thesis/dissertation

  • Effects of Cooling Strategies and Machining Parameters on Cutting Forces, Cutting Temperature, and Tool Wear in End-Milling of Ti-6Al-4V using Design of Experiment
  • Experimental Investigation of the Effects of Cooling Strategies and Cutting Parameters on Surface Roughness and Residual Stresses in End-Milling of Titanium Alloy, Ti-6Al-4V, using Design of Experiments

Pagination

xv, 155 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2013 Emenike Nick Chukwuma, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 12007

Electronic OCLC #

1313117301

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