| 摘要 |
PURPOSE:To after a sand core, withstanding casting pressure and to provide the sand core, which enable fixation of metal coating to be made to cast-in inside the product, by coating surface of the sand core by the metal and giving rough-shape on the coating surface by machining, etc. CONSTITUTION:The core body 1 uses silica sand, etc., and is formed by using phenol resin, etc., as organic binder. Aluminum alloy, etc., is coated on surface of the core body 1 by thermal spraying and dipping, to form coating layer 2. Next, the groove 3 is cut on the surface of the coating layer 2 by machining, etc. Projection part to replace the groove 3 may be arranged. This core 4 is set in a movable die 5 and together with a fixed die 6, in the case of casting aluminum alloy, etc., by die casting method, the core is made to withstand the pressure casting by existance of the metal coating and at the same time, the fixation of the metal coating to be cast-in can be surely executed.
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