Study on Solidification Behavior of Aluminium alloy ( LM 6 ) Castings by using Computer aided Simulation software
Method layout of a casting is an important aspect of tooling development. It involves decisions regarding part orientation in mould, parting line, cores, cavity layout, feeders, neck and gating system. An improper method layout leads either poor quality or low yield, which affects the productivity. Method design is mostly carried out manually, using 2D drawing of the cast part. Then tooling is fabricated the sample castings are produced to 3-4 trials which involves lot of production cost in the from of wastage of manpower, time and hamper the day to day schedule of the particular production. Computer simulation provides a clear insight regarding the location and extent of internal defects, ensuring casting are right as first time and every time. In the present study plate castings were considered to study the solidification behavior of Aluminium Alloy (LM6) at different sizes of riser and riser neck. The VEM based casting simulation software is used to study the solidification behavior of above castings. The simulated results were compared with the experimental results. It is expected that this work will be of immense importance equally to the academicians as well as to the industrial methoding engineers.
Classification and Simulation based Design of 3 D Junctions in Castings
Many casting defects, which cannot be eliminated by changes to tooling and process parameters, can be attributed to poor design of the part with respect to manufacturability. One such common defect is shrinkage porosity occurring at casting junctions. We present a generic classification of 3D casting junctions in terms of the number, thickness and cross-section of converging elements (walls), and the angle between pairs of elements. These junctions have been modeled, and simulated for solidification to predict the extent of shrinkage porosity defect using Vector Element Method. The results are shown for 'L' junctions with varying fillet radius (both inner and outer) and validated by experiments, followed by parametric analysis to formulate design for manufacture guidelines. Finally, a benchmark part with 3D junctions is presented to show how simulation can be used to predict and prevent the defect by modifying the junction design.
Mechanism of Action of Antibacterial Agents
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