The effects of casting conditions and pretreatment of core on the small rotor were investigated by using the SEM, opitical microscopy, colour check and X-Ray. From the results, the opitimum pouring temperature and injection pressure were identified.
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The effects of casting conditions and pretreatment of core on the small rotor were investigated by using the SEM, opitical microscopy, colour check and X-Ray. From the results, the opitimum pouring temperature and injection pressure were identified.
Also the infection speed had little influence on the quality within the some constant range. The pretreatment of core was effective in the gas hole reduction.