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铸造用金属模,由于铸造时的热应力而变形,引起铸件尺寸精度下降或产生飞边等,成为发挥金属模铸造特点的障碍。特别是用于铸铁的金属模铸造时。对这种热变形更需要采取措施。日本金属材料研究所金属加工研究部,为了研制对热变形有抵抗能力的金属模,进行了金属模的表面条件和热变形规律等方面的研究。影响金属模热变形的因素是复杂的,如金属模的热力学等等性质,但减少金属模表面热膨胀的方法是行之有效的。这就是:a).防止表面部分的温度上升;
Casting molds are deformed due to thermal stress during casting, causing a reduction in the dimensional accuracy of the castings, resulting in burrs and the like, hampering the characteristics of the mold casting. Especially for cast iron mold casting. More need to take measures to this hot deformation. Japan Metal Materials Research Institute of metal processing, in order to develop a mold resistant to thermal deformation of the metal mold surface conditions and thermal deformation laws and other aspects of research. The factors affecting the thermal deformation of the mold are complex, such as the thermodynamic properties of the mold, etc. However, the method of reducing the thermal expansion of the mold surface is effective. This is: a) Preventing the surface temperature from rising;