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.
自行研制了模拟厚大铸件的冷却环境的小型凝固装置。
A small apparatus used for simulating cooling environment of heavy section ductile iron castings was developed by authors themselves.
中小型尺寸的铸件砂型是在一个砂箱中制造，砂型由两部分或更多部分组成，以利于模型的顺利取出。
Sand molds for the production of small and medium-sized castings are made in a molding box. The mold is made in two or more parts in order that the pattern may be removed.
中小型尺寸的铸件砂型是在一个砂箱中制造，砂型由两部分或更多部分组成，以利于模型的顺利取出。
Sand molds for the production of small and medium-sized castings are made in a molding box. The mold is made in two or more parts in order that the pattern may be removed.
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