As competition grows among manufacturing companies, greater emphasis has recently been placed on product aesthetics and decreasing the product development time. This is promoting and standardizing widespread use of sculptured surface styling within product design. Therefore, industries are looking for high efficiency machining strategies for sculptured surface machining (SSM). Many researchers have produced various methods in tool path generation for SSM. Five-axis curvature matched machining (CM2) is the most efficient. With the widespread use of 5-axis mill in industries, CM2 is a better solution for improving the machining efficiency for product concept models. CM2 has very good performance for global machining of single patch surface or a quilt of simple sculptured surface patches. But when CM2 is used to generate tool paths for global machining of a large region of complex sculptured surface such as the top or side skins of a vehicle, there will be some limitations, that is, the performance will be influenced greatly in some steep areas where the lead angle of the tool becomes larger to match the curvature or avoid gouging. Larger lead angles mean smaller effective curvatures at the leading edge of the tool bottom where it contacts the part surfaces. Therefore, the density of CM2 tool path is very high in these steep regions. By setting a smaller upper limit for the lead angle, the density of tool path will not be very high in the steep regions, but there will be some uncut materials. This thesis focuses on how to determine the uncut or rework areas of the previous CM2 and how to define the boundary of these regions. Strategies for generating more efficiency CM2 tool paths are also discussed. These methods will be tested by applying finish global machining to a one-fourth scale Ford GT model.

This study explores the relationship between endmill tool dynamics and cutting parameters, emphasizing the impact of these factors on machining dynamics, surface finish, and dimensional control. It introduces a novel approach to analyze and optimize the overall performance of a solid carbide endmill, with a specific focus on machining Aluminum 6066-T6. By using stability lobes diagrams (SLD), stable conditions for cutting were chosen, and then surface roughness and tool and workpiece vibration analyses were performed to assess machining performance. This work aims to understand the effects of operating below the peaks and valleys, inherent in the shape of the SLD, using different RPMs. The study's methodology involves tap tests using CutPro - Tap Test Module and milling tests on a horizontal machining center. The surface roughness measurement was performed using an Alicona Infinite Focus confocal microscope and accelerometers were positioned on the spindle bearing housing and workpiece. The findings suggest that within the stable range below the stability lobe diagram's boundary, there is a significant difference in vibration resulting in variation in surface roughness corresponding to the peaks and valleys of the SLD. The variation of acceleration, and consequently vibration, was considerably higher when operating below valleys which negatively affected the surface roughness of the workpiece. The surface roughness plays a pivotal role in tool performance and subsequently influences metal removal rate and tool and spindle life. For conditions closer to instability, this is even more important. In conclusion, this research lays the foundation for a holistic approach to solid carbide endmill design and cutting parameter selection, showing that the machining process can be optimized in terms of the SLDs, even in regions far below the stability limit / Thesis / Master of Applied Science (MASc)

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<p>Experiments were performed to study the effect of surface finish and jet velocity on the boiling performance at the stagnation point under a free liquid planar jet. A rectangular jet with dimensions 9 mm x 1 mm was used to impinge subcooled water on the center of a copper surface 8 mm width x 20 mm length. Jet velocities ranged from 0.9 to 2.5 m/s while the degree of subcooling was kept constant at 10 °C.</p> <p>Three surfaces were prepared using emery paper #1200, #500 and #320 and the arithmetic mean square of the roughness <strong>Ra</strong> = 18.72, 401.65 and 533.53 nm.</p> <p>Increasing the jet velocity has shown to increase the heat flux slightly in the single phase regime. Also by increasing the jet velocity, boiling was found to start at higher surface superheat achieving higher values of burn out heat flux BOF for jet velocities V_j ≤ 1.5 m/s. This trend agrees with studies reported in literature. Some contradicting results occurred at higher jet velocities which is attributed to the flow profile.</p> <p>For jet velocities lower than 2 m/s, the surface with higher <strong>Ra </strong>was found to have a delayed Onset of Nucleate Boiling ONB, higher Burn out Heat Flux BOF, and lower rate of heat transfer in the single phase regime. Surface finish did not show significant effect on boiling performance at higher jet velocities. The contradictions observed at jet velocities higher than 1.5 m/s were attributed to the flow profile. Results regarding the effect of surface finish on heat transfer in the single phase regime under liquid jet impingement were compared to literature and a reasonable agreement was found. More studies are needed to explain the contradictions found for higher jet velocities.</p> / Master of Applied Science (MASc)

Cindy McTee, Regents Professor of Composition in the College of Music at the University of North Texas, is one of America's leading composers. Her music is an eclectic blend of the "American" sound that is created by the use of a multiplicity of techniques. This document uses three of McTee's most recent (to date) works for wind band: Timepiece, Ballet for Band and Finish Line, to identify the primary stylistic characteristic's of the composer's music, which include: jazz influence; use of ostinati, pseudo-ostinati and machine-like rhythmic patterns and figures; creation of extended and angular melodic lines; progressive "walking" bass lines; and the use of octatonic and chromatic collections. Through the identification of stylistic characteristics, concise stylistic analysis of the works, interview transcript, list of composer's works to date, and selected discography, this document will add to the limited body of scholarly writing on the composer.

In today’s society, textile producers and manufacturers strive to use as little harmful chemicals as possible in their finishing of textiles. Though, producing a completely chemical free fabric is nearly impossible, many companies work actively to scan and evaluate alternatives to chemical substances that have a negative effect on the environment and the human health.Prior preparations for the practical part of this project were conducted in a literature study, which entailed studying articles based on similar projects. Practical information was attained from the mentors at IKEA and from contact with the suppliers of the tested resins. A study of alternative methods of testing the resistance to creasing of textiles was conducted to the benefit of IKEA. A practical evaluation of the smoothness appearance of the test specimens resulted in a development of this existing method.To reassure the quality of the scan, obtained resins weretreated on cellulosic weaves, and later on evaluated based on demands IKEA has for easy care treated textiles. The demands concerning the content of formaldehyde and the grade of smoothness appearance retained after ten washes where followed throughout the whole project. The evaluation was conducted based on several quality tests made on the treated weave. This resulted in a recommendation of four different resins for IKEA to further investigate. / Program: Textilingenjörsutbildningen

Content: Development of eco-friendly chemicals from natural renewable resources are widely explored owing to its eco-acceptable and sustainability. Exploring biopolymers is the need of an hour to combat the sustainability in leather processing. Finishing is an imperative step that enhances the aesthetic appeal of the final leathers, in which, protein finishing system is known for its glazing properties. Commonly used cross-linkers as such formaldehyde and glutaraldehyde are restricted owing to biocompatibility issues. However, the use of crosslinker is inevitable for protein finish system. In the present research, nano-bio polyaldehyde (NBP) system is established through selective oxidation of starch; the size of the system is fine-tuned in the nano range for effective and efficient crosslinking through emulsion technique. The architectural design of NBP is ascertained as a good crosslinking agent for leather finishing chemicals from the characterization studies. A particle size of the NBP system found to be in the range of 80-110 nm. The surface properties of NBP treated leathers were characterized by the contact angle. The leather samples showed improved hydrophobicity nature with a contact angle of ~ 126º and also enhanced wet, rub fastness, color fastness, and adhesion strength. The study provides an insight on tunability of known biopolymers for developing sustainable technology. Take-Away: An insight on tunability of known biopolymers for developing sustainable technology

These thesis deals with electromigration in solder joint. In theoretical part are described lead-free solders, surface finish, formation of solder joint, intermetallic compounds a electromigration. In practical part is investigated a effect of electromigration on growth intermetallic compounds in solder jsoint.

These Graduation Theses solve effects of tribological behaviour of materials pairs on the basic of the SIGMA GROUP a.s. requirements. For available materials there was a target to design tribological pairs and check their behaviour.

This work is aimed to the study of mixtures of solvents type "green" and nanoparticles in direct interaction with selected polymeric surface treatment. The values in question are resistance of surface treatment to effect of solvent mixtures with additions of nanoparticles agents and removability of selected impurities from coating layers of polyvinyl chloride, polyurethane and polyester by solvents of the basis of mixed esters.