【摘要】 <正> 不同形状和壁厚的铸件有着不同的凝固冷却速度。因而也有着不同的机械强度。铸件的凝固冷却速度取决于铸件的热容量差和其体积与表面的比值,即铸件模数。在本研究中,探讨了相同截面和不同形状(矩形、三角形、平板和圆柱形)的铸件的机械强度和铸件模数的关系。更多还原

【Abstract】 It was found that the cooling rate of casting becomes smaller as the diameter of the core （sand mold and furan mold） becomes smaller with the increase of the sectional area and mass of castings and moreover cooling rate of the castings have an effect on the mechanical strength, 1) The solidification time of square castings is a function of n-th power of casting’ modulus. The n-th value index number is obtained to be n=1.9 in numerical calculation and thus in both （sand mold and furan mold） approximately n=1.9. As a result, an equation of the solidification time of casting expressed as t₌k （V/S）^1.9 is obtained. 2) The mechanical of strength is considered to be closely related to the reciprocal of the Casting’ modulus and the appropriate equation is obtained σ_B=K₁（1/（V/S）ⁿ, H_B=K₂（1/（V/S））ⁿ, where in the K value varies with mass and material quality. 3） The mechanical strength relates to the sand mold and furan mold of cores has been most nearly allied to these varies.更多还原