Prediction of chip-breaking in machining is an important task for automated manufacturing. There are chip-breaking limits in maching chip-breaking processes, which determine the chip-breaking range. This paper presents a study of chip-breaking limits with grooved cutting tools, and a web-based machining chip-breaking prediction system. Based on the chip-breaking curve, the critical feed rate is modeled through an analysis of up-curl chip formation, and the critical depth of cut is formulated through a discussion of side-curl dominant chip-formation processes. Factors affecting chip-breaking limits are also discussed. In order to predict chip-breaking limits, semi-empirical models are established. Although the coefficients that occur in the model are estimated through machining tests, the models are applicable to a broad range of machining conditions. The model parameters include machining conditions, tool geometry, and workpiece material properties. A new web-based machining chip-breaking prediction system is introduced with examples of industrial applications.

Spindle failure during fast steel rolling is one of the major equipment failures encountered at Onesteel Whyalla Steelworks (WS). Spindle failure whilst infrequent has been occurring over a long period of time and is a significant cost impost in terms of replacement parts, repair and lost production. Previous attempts at mechanical analysis and spindle redesign have not rectified the problem. This thesis presents an in-depth investigation of the problem and uses a completely new approach, modeling and control, to obtain a solution to the problem.

Please read the abstract in the section, 00front of this document / Dissertation (M Eng (Electronic Engineering))--University of Pretoria, 2002. / Electrical, Electronic and Computer Engineering / MEng / unrestricted

This classic textbook is a comprehensive introduction to structural steelwork design. It describes the design theory and code requirements for common structures, connections, elements and frames. The book is structured to meet the needs of courses in structural steelwork, introducing and explaining each concept before allowing the student to test the knowledge with practical examples. Each section is illustrated with exercises for the student to reinforce their learning. It continues to be an indispensable introduction to structural steelwork design for students of structural and civil engineering.

<p>As global politics realized a fundamental realignment with the end of the Second World War, the Canadian state desired the formation of a national consensus over its newly developed Cold War policies. It set about this task through the use of anti-communist rhetoric to facilitate a repressive and intolerant atmosphere where dissent of state policies could be identified as subversive and dangerous. In promulgating this Cold War ideology, Ottawa was wary of the illiberal approach that characterized American McCarthyism. Rather, Ottawa adopted a strategy of "privatizing" its anti-communism through the use of extra-state actors. By "farming" out its repressive activities, Ottawa could portray itself as a neutral defender of liberal values, while at the same time facilitating a climate of repression that would further its policy aims. Attendant to this, the extra-state actors used this state facilitated framework in order to advance their own interests and agendas. This strategy was starkly illustrated by the USWA raids against IUMMSW Local 598 in 1962. The interests of the state, the Catholic Church, CLC, and USWA coalesced around the elimination of Mine Mill local 598 as a representative of miners in northern Ontario. The Catholic Church sought the elimination of a progressive secularizing force in the Sudbury community that threatened the Church's institutional reproduction. For Steel, the acquisition of over 17,000 dues-paying members and the elimination of IUMMSW as a competitor in the membership rich northern Ontario mining communities. While the state prospered from the virulent anti-communist environment and the elimination of a potentially militant union from control over the largest source of nickel in the non-Communist world. Thus the boundaries demarcating the state from civil society are less clear than some would have us believe. The USW A/Mine Mill events illustrate the nuance in the relationship between the state and private actors in the mobilization of ideological hegemony.</p> / Master of Arts (MA)

No / The fourth edition of Structural Steelwork: Design to Limit State Theory describes the design theory and code requirements for common structures, connections, elements, and frames. It provides a comprehensive introduction to structural steelwork design with detailed explanations of the principles underlying steel design.

Les particules mobiles du sol peuvent transporter des polluants vers la nappe phréatique. Dans les crassiers sidérurgiques, les éléments métalliques lixiviés contribuent à une contamination rapide des eaux du sol. L’objectif de ce travail est de comprendre les mécanismes qui interviennent dans le transport en solution et sous forme particulaire dans des déchets sidérurgiques stockés sur le long terme. Pour ce faire, une caractérisation complète des compositions minéralogiques et chimiques a été effectuée. Elle révèle que ces déchets sont constitués de minéraux de haute température typiques des laitiers et de minéraux d’altération météorique. Les eaux de percolation montrent des pH élevés, dus à des teneurs élevées en calcium, et des teneurs importantes en aluminium et silicium. Les teneurs en chrome et molybdène, et ponctuellement en vanadium sont élevées dans les lixiviats des laitiers de fusion. L’analyse granulométrique des particules mobilisées, pour des pluies simulées en colonne, indique que leur taille moyenne est de 200 µm, ce qui laisse prévoir une faible mobilité dans les formations sous-jacentes moins perméables. Les calculs de spéciation montrent que les lixiviats sont saturés ou proches de l'équilibre vis-à-vis des silicates calciques hydratés et souvent saturés en molybdate de calcium. / Mobile soil particles can transport pollutants to groundwater. In slag heaps, leached metallic elements contribute to soil water contamination. The aim of this work is to identify the role of slag particles in contaminant transport under unsaturated and saturated conditions. Mineralogical compositions and physicochemical properties of slags are first determined. The analysis show high temperature slag phases and weathering phases. Percolation tests are also carried out in repacked waste columns under infiltration/drying cycles to find out the effects of dry periods on in situ particle mobilization. Preferential flows lead to rapid transport of solute through the repacked column in vadose zone. Leachates are characterized by high pH and high concentrations of calcium, aluminum and silicon, molybdenum, chromium in the fusion slags. Speciation calculations showed that the leachates are saturated in calcium silicate hydrates. Laser size analyzer shows that the slag particles mobilized during the simulated rain events are around 200 µm, which suggests low mobility in the less permeable underlying formations.

I deal with the constructive technological project about building of pavilion P on the technology side in my masters thesis. The aim is to solve the structure from the aspect of time and financial requirements. I deal in more detail with the project of site equipment, with description the execution of foundation constructions and with construction steelwork.