| abstract |
In a method of manufacturing a lost wax precision casting mold, a resin composition for a model having excellent wax shape retention and dewaxing property is set, and a dewaxing method suitable for the resin model is set. Furthermore, the mold in the low temperature region to be dewaxed is reinforced. A resin model formed by curing a two-component reaction-curable urethane resin liquid F comprising a polyfunctional polyol component A, a polyfunctional polyisocyanate component B, a plasticizer C, a wax component D, and a hollow resin balloon E. Is coated with a primary layer composed of a plurality of refractory coatings with an epoxy silicon layer interposed therebetween and a backup layer composed of a plurality of thick coating layers, and is preliminarily kept at a low temperature range of 60 to 120 ° C. for 2 to 8 hours. Heating is performed, 5 to 50% of the weight of the resin model is initially dewaxed, and the temperature in the furnace is gradually increased, and heating is performed in a medium temperature region of 150 to 500 ° C for 2 to 5 hours. Firing in a high temperature region for 2 to 5 hours to form a mold. [Selection diagram] None |