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김인규,유한균,이의길,최양진,김하영 한밭대학교 산업과학기술연구소 1995 논문집 Vol.3 No.-
A piano plate is provided, preferably on the top surface thereof, with a fine rugged pattern comprised of a number of shallow recesses of various shapes and dimensions for betterment of its resonance characteristics responding to vibrations of a wide variety of frequencies, particularly to vibrations in the treble range, and, when required, for enrichment of aesthetic effect. The vacuum process is advantageously used for manufacturing thereof thanks to its smooth flow of molten metal at casting and easy removal of the cast product from the associated mold. The mechanical properties and damping capacity of cast product by vacuum process were investigated. The decrease in the damping capacity was attributable to the characteristic property of graphite and distortion for the cast product was improved by pouring temperature and romoval time.