Graduate Thesis Or Dissertation
 

An experimental study on the use of inclusion trapping devices for investment casting

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/m326m415d

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  • A problem facing the casting industry is inclusions in the finished parts. The inclusions can be sand from the molds, oxides or other impurities in the metal charge. Inclusions lead to costly part repairing or reworking. A study was done to try and find inclusion trapping devices that could be placed in the gating system. The experiments consisted of pouring water and suitable inclusion models into clear, full scale, plastic molds. The fills were video taped for later analysis. The efficiency of the trapping device was determined from the end location of the inclusions. No work was done on other anti-inclusion methods such as ceramic filters, bottom pour ladles, chemical additives, etc. The research showed that a swirl chamber which used centrifugal force to separate inclusions worked quite well if set up correctly. The optimum setup was a vertical swirl chamber with a well. The inlet passage was choked and located below the exit passage. It also worked much better than any setup which tried to use buoyancy for separation. The large volume of the swirl chamber may be objectionable. However, properly shaped inserts, such as an ice-cream cone shape, can be put into the chamber to reduce fill volume while still maintaining good efficiency and fills. The efficiencies of the chambers behave as expected; faster pours are less efficient and bigger chambers (for a constant size mold) are more efficient. The use of outlet chokes may or may not improve separation efficiency, but will improve the filling of the part cavity.
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