| 摘要 |
PURPOSE:To eliminate the need for a special device for preheating a material to be embedded by casting by forming a coating layer of a surface treating agent on the surface of said material and forming a coating layer of an exothermic material in superposition thereon then embedding said material by casting a molten material for embedding by casting. CONSTITUTION:A coating layer 6 of a surface treating agent is formed on the surface of a material to be embedded by casting, for example, a pipe 1, and further a coating layer 7 of an exothermic material is formed on the surface thereof. A casting mold 4 is then formed and after the pipe 1 is installed into the mold 4, casting sand 3 kneaded with a furan resin, etc. is introduced into the pipe 1 and is compacted. A molten metal 8 is thereupon poured through a sprue 5 into the mold to embed the pipe 1 by casting, thus producing a composite pipe casting. The coating layer may be of one layer consisting of a mixture composed of the surface treating agent and exothermic material without forming the same of the above-described two layers. |
