Sökning: "Castings"

Visar resultat 21 - 25 av 51 avhandlingar innehållade ordet Castings.

1. 21. Gjutningens arenor : Metallhantverkets rumsliga, sociala och politiska organisation i södra Skandinavien under bronsåldern

   Författare :Anna Sörman; Anders Andrén; Alison Klevnäs; Christopher Prescott; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Bronze Age; southern Scandinavia; bronze casting; metalworking; craft production; craft organisation; workshops; social organisation; elite; heterarchy; prestige goods; social reproduction; arkeologi; Archaeology;

   Sammanfattning : Production and use of metalwork in southern Scandinavia during the Bronze Age (1700-500 BC) has above all been attributed to emerging elites. That bronze was a source and medium for social power is evident from its use in socio-political and ritual spheres, the multiple skills and elaborate aesthetics involved in its crafting, and the arenas for influence and control offered by the acquisition of metals through long-distance exchange. LÄS MER

3. 22. Imperfections in Recycled Aluminium-Silicon Cast Alloys

   Författare :Anton Bjurenstedt; Anders Jarfors; Salem Seifeddine; Pål Schmidt; Jönköping University; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Imperfections; Recycled cast Al-Si alloy; Fe-rich particles; Melt quality; Fractography; Differential scanning calorimetry.;

   Sammanfattning : In striving to produce high quality cast components from recycled aluminium alloys,imperfections have to be considered, because recycled aluminium usually containsmore of it. However, there are great energy savings to be made by using recycledaluminium; as little as 5% of the energy needed for primary aluminium productionmay be required. LÄS MER

4. 23. Metal Expansion Penetration During Solidification of Grey Cast Iron

   Författare :Izudin Dugic; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Grey cast iron; solidification; solidification modelling; graphite expansion; molar volume; casting simulation; thennal analysis; thermoanalysis cup; casting temperature; inoculation; inoculant; meta! expansion penetration; eutectic cell size.; TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : The meta! expansion penetration has been examined experimentally. The whole casting process was simulated using a commercial software, in order to investigate the solidification characteristics and the pore formation in the casting studied. LÄS MER

5. 24. A critical survey of the grain refining mechanisms of aluminium

   Författare :Mats Johnsson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; strukturkemi; Structural Chemistry;

   Sammanfattning : In the present work, several possible interpretations of the grain refining mechanisms of aluminium castings after additions of titanium and boron are compared with the results of critical test experiments. The presence of B does not seem to affect the binary Al-Ti phase diagram close to the A1 comer, except for formation of boride phase. LÄS MER

7. 25. On determining lost core viability in high-pressure die casting using Computational Continuum Mechanics

   Författare :Sebastian Kohlstädt; Pär Jönsson; Julio Hernandez; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; high-pressure die casting; lost salt cores; computational continuum mechanics; two-phase compressible flow; OpenFOAM; CFD; fluid-structure interaction; volume-of-fluid method;

   Sammanfattning : The subject of this thesis work is to investigate whether Computational ContinuumMechanics (CCM) can serve as a valuable tool for the casting engineerto determine a priori whether a housing concept with inlying geometries thatso far only exists in Computer Aided Design (CAD) will have the desired coolingperformance and will be manufacturable with an acceptable number ofrejects.As of spring 2019, no application in serial production of lost cores, i. LÄS MER