覆膜砂锻造在锻造规模已有相当长的历史，铸件的产量也相当大；但采用覆膜砂锻造出产紧密铸钢件时面临良多灾题：粘砂、冷隔、气孔。

覆膜砂的型或芯既可互相共同操作又可与其它砂型芯共同操作；不仅可以用于金属型重力锻造或低压锻造，也可以用于铁型覆砂锻造，还可以用于热法离心锻造；不仅可以用于铸铁、非铁合金铸件的出产，还可以用于铸钢件的出产。

覆膜砂砂芯的存放期可任何砂芯城市吸湿，出格是南方地域空气相对湿度大，必需对砂芯存放期在工艺文件上加以划定，操作精益出产进步前辈先出的出产方式减少砂芯的存放量和存放周期。覆膜砂既可建造铸型又可建造砂芯。

Coated sand forging has a long history in forging scale, and the output of castings is also quite large; However, when using coated sand to forge compact steel castings, it faces many disaster problems: sand sticking, cold insulation and air hole.

The mold or core of coated sand can be operated together with each other and other sand cores; It can be used not only for metal mold gravity forging or low-pressure forging, but also for iron mold sand coating forging, but also for thermal centrifugal forging; It can be used not only for the production of cast iron and non-ferrous alloy castings, but also for the production of steel castings.

The storage period of coated sand core can absorb moisture in any sand core city, especially in the south, where the air relative humidity is high. It is necessary to delimit the storage period of sand core in the process documents, operate lean production, improve the production mode of predecessors and first out, and reduce the storage volume and storage cycle of sand core. Coated sand can build both mold and sand core.