Search for dissertations about: "Casting problems"

Showing result 1 - 5 of 30 swedish dissertations containing the words Casting problems.

  2. 1. A Study of the Initial Mould Filling during Up-hill Ingot Casting

    Author : Line Hallgren; Pär Jönsson; Anders Tilliander; Seppo Louhenkilpi; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; swirling flow; up-hill teeming; nozzle; casting; fluid flow; modelling; CFD; LDA; swirl; ingot casting; filling; red eye;

    Abstract : The fluid flow in the mould during up-hill teeming is of great importance for the quality of the cast ingot and thereby the quality of the final steel products. At the early stage of the filling of an up-hill teeming mould, liquid steel flows with a high velocity from the runner into the mould. READ MORE

  4. 2. Problems in the Aluminium DC Casting Process Associated with Melt Treatment Operations

    Author : Ghadir Razaz; Torbjörn Carlberg; Arne.K Dahle; Mittuniversitetet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : The quality of DC cast Al alloys is highly dependent on melt batch composition and impurity level in the molten alloy. The chemical composition and cleanliness of a melt is controlled through the melt treatment operations, carried out while the melt is still in the furnace before casting starts. READ MORE

  5. 3. Numerical Modelling of Some Engineering Heat Transfer Problems

    Author : Daniel Eriksson; Värmeöverföring; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy research; Energiforskning;

    Abstract : Engineering heat transfer problems are very often of a complex nature and most often no analytical solutions exist. One way to create solutions to such problems is to apply numerical methods. This study concerns heat transfer problems with coupled conduction, convection and thermal radiation. READ MORE

  6. 4. Thermal cracking of young concrete : partial coefficients, restraint effects and influence of casting joints

    Author : Martin Nilsson; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Structural Engineering; Konstruktionsteknik;

    Abstract : Cracks can occur due to temperature induced movements during the hardening phase of concrete. Thermal cracks are not decisive for the load-bearing capacity but cause costs for repair and may reduce the life of the structure. The risk of cracking can be judged through safety values, (partial coefficients) given in building codes. READ MORE

  7. 5. On the surface quality of continuously cast steels and phosphor bronzes

    Author : Saud Saleem; Hasse Fredriksson; Michael Vynnycky; Toshihiko Emi Takaido Higashi; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Continuous Casting; Steels; Ni-based alloy; Peritectic; Phosphor Bronzes; Simulation and Modeling; Teknisk materialvetenskap; Materials Science and Engineering; Industriell ekonomi och organisation; Industrial Engineering and Management; Metallurgical process science; Metallurgisk processvetenskap;

    Abstract : This thesis work concerns about the importance of the cast surfaces, surface phenomenon such as the formation of the oscillation marks and exudation and related defects including cracks and segregation that happened during the continuous casting. All of the investigated materials were collected during the plant trials while an in-depth analysis on these materials was performed at the laboratory scale with certain explanations supported by the schematic and theoretical models. READ MORE