Abstract
In this paper, the influence of the numbers of molds and the position in an electric furnace on the relationship between heating time and mold temperature was investigated using gypsum-bonded investment for quick heating, and the appropriate usage of the investment was studied. As a result, when a single mold was heated, the rate of increase in the temperature of the mold was lowest at the right front of a left hinge furnace. When five molds were heated at the same time, the rate was lower than that when a single mold was heated. The rate of the mold positioned at the center of furnace, which was surrounded by the four other molds, was the lowest. Molds should be repositioned in a furnace during heating to ensure uniform heating, or the order of casting should be determined in accordance with the mold temperature, when heating multiple molds at the same time.
