分析了覆膜砂在热作用下对型砂强度、断裂表面和变形的影响。
Effects of heat performance on strength? Fractures and bending of coat sand were analyzed.
综合评价了小型液压阀体铸件型芯的芯砂材料，介绍了覆膜砂热芯盒设计特点以及覆膜砂制芯设备等。
Sand mixtures of cores for small hydraulic valves casting were reviewed. Design of hot boxes and equipments for production of coated sand cores were described.
测定了覆膜种砂在激热条件下的膨胀值，并与相同条件下普通覆膜硅砂的膨胀值进行了对比。
The thermal expansion values of the precoated non silica and have been measured and contrasted with them of the precoated silica sand on the same conditions.
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