石英砂型芯是采用熔模精密铸造的常用材料，通过特定的制芯工艺制成的一种铸造用型芯。
Quartz sand core, which is made in accordance with a special core making technique of casting, is one of common materials used in Investment casting.
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.
采用功率型铁粉芯铁芯材料绕制。
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