ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
The Council for Science and Industrial Research has developed and patented a rheocastingprocess. The process involves the preparation of semi-solid slurries from liquid metal, by controlledcooling and MHD stirring using induction coils. An industrial prototype was designed and built totest the system in an industrial environment.A semi-solid high pressure die casting cell was set up with an industrial partner and the system wastested under normal production conditions. The production cell consisted of the CSIR rheocastingsystem, a six axis robot, dosing furnace and 400 ton H-400SC shot controlled Bühler HPDC machine.An engine mounting bracket originally designed for liquid HPDC was redesigned for SSM forming(casting) taking into consideration the flow and thermal behaviour of semi-solid casting process, thefunction of the component and the required mechanical properties. Although a full production runwas not completed due to an ancillary equipment failure, sufficient castings were produced to performpreliminary evaluation of the components. The processing parameters used were, die temperature of250ºC, SSM casting temperature of 580ºC ±1Cº and a piston injection velocity of 0.13 m/s. Initialevaluation showed evidence of casting defects due to a combination of factors: diedesign/manufacture, casting parameters and poor foundry practice. From the mechanical tests it wasevident that if the die design, casting parameters and foundry practice are optimized components withadequate mechanical properties can be reliably produced
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.501.pdf
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