| 摘要 |
PURPOSE:To enable reduction in the weight of a pattern for a casting mold consisting of silica sand and a resin and to improve workability and safety by compounding a heat insulating and lightweight weight reducing agent having microwave transmittivity in a reinforcing material constituting the pattern. CONSTITUTION:A heat resistant rubbery layer 1 having the sectional shape corresponding to the shape of a desired casting mold is deposited on the inside enclosed circumferentially by a metallic flask 3, and a heat insulating and lightweight weight reducing agent having microwave transmittivity, for example, pearlite or the like is compounded with the component of a reinforcing material consisting of silica sand as an essential component and a resin such as an epoxy resin in about 20-100wt% range basing on the weight of the silica sand; further, the other reinforcing material and curing accelerator are added thereto, if necessary, to select the suitable strength of the material 2 according to the kind of the casting mold. The reduction in the weight of the pattern is thus made possible without spoiling the curing characteristic of the casting mold by microwave heating and the case of handling and safety are improved. |
