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- W2325953562 startingPage "104" @default.
- W2325953562 abstract "The occurrence of microshrinkage defects are often found on large size pistons when they are cast in AC8A alluminum alloy, besides, the removal of those defects are considered very difficult.Through the inspection and the test of such pistons on which those microshrinkage defects exist, we found that the fatigue strength of the pistons at room temperature is approximately 7-9kg/mm2.Aiming at the removal of such casting defects, we have improved the casting methods as follows:(1) To secure sufficient degasification, we apply both Cl2 gas blowing method and remelting method in the casting process.(2) To secure steady and yet fast pouring, we improved the runner.Namely we built a lucite replica in the same shape as the piston mould, and poured water through it to obserbe the water flow, so that we could improve the runner to meet our aim satisfactorily.(3) In order to obtain better solidification rate, we apply the water cooling to pistonpin-core, bottom mould and outside mould.After applying the above-mentioned modifications, we cast AC8A alluminum alloy pistons and carried out the defects inspection and the fatigue test.As a result, it was made clear that the casting defects in piston-crown, ring-groove, and piston-pin-boss were almost completely removed, and the fatigue strength in these parts are marked as 12-13kg/mm2 at room temperature and 4.3kg/mm2 at 300°C." @default.
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- W2325953562 date "1965-01-01" @default.
- W2325953562 modified "2023-10-18" @default.
- W2325953562 title "Studies on the permanent mould casting of AC8A aluminum alloy piston" @default.
- W2325953562 doi "https://doi.org/10.2464/jilm.15.104" @default.
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