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铝合金铸造时,金属型的工作温度一般保持在250～400℃的范围内。但大型金属型在每班浇注的后期,一些热量集中的部位(如金属型芯,内浇口附近的型腔面等),其工作温度有时超过400℃,达到450～500℃。这样高的工作温度必然会产生比较显著的热膨胀。 金属型热膨胀大小可用线膨胀量表示: 即 △L=dL△T
Aluminum alloy casting, metal-type operating temperature is generally maintained at 250 ~ 400 ℃ range. However, in the late stage of each shift of large-scale metal type, some concentrated areas of heat (such as metal cores, cavity surfaces near the gate, etc.) sometimes operate at temperatures exceeding 400 ° C and reaching 450 to 500 ° C. Such a high operating temperature will inevitably produce more significant thermal expansion. Metal-type thermal expansion can be used to express the amount of linear expansion: △ L = dL △ T