Method for manufacturing resin casting die used for modeling sodium silicate self-hardening sand

Abstract

The invention relates to a method for manufacturing a resin casting die used for modeling sodium silicate self-hardening sand. The method is characterized by comprising the following steps of: (1) preparing a resin prototype by rapid modeling equipment according to a three-dimensional CAD (Computer-Aided Design) model; (2) rapidly obtaining a die cavity for manufacturing a resin casting die by utilizing the made resin prototype through the rollover of a room-temperature silicified rubber die; (3) manufacturing the resin casting die by utilizing the die cavity through a manual pasting mode; and (4) making the inner cavity of the resin casting die into a hollow structure mode, leaving an air inlet at the bottom of the resin casting die and alternately drilling a plurality of air outlets along the surface of the resin casting die. The invention has the advantages of (1) being convenient to design and modify the casting appearance; (2) improving the size accuracy of the die and the surface smoothness of the die and shortening the processing cycle of the die; (3) rapidly hardening the sodium silicate self-hardening sand on the die surface to facilitate a subsequent die-drawing process; and (4) improving the surface quality of the casting and lightening the labor intensity of workers.

Description

technical field [0001] The invention belongs to the technical field of material processing engineering, and in particular relates to a resin casting mold manufacturing method for water glass self-hardening sand molding. Background technique [0002] In the casting process of water glass self-hardening sand molding, obtaining sand molds with high surface quality is the basis for obtaining high-quality cast steel or cast iron castings. At present, the water glass self-hardening sand molding molds used in China are all wooden molds. The surface quality of the wood molds is relatively rough, and the method of blowing carbon dioxide gas from the outside of the mold is generally used in the hardening process of the sand mold, which causes the water glass on the surface of the mold to self-cure. Poor hardening of the hard sand will cause the sand and the mold to stick together. When the mold is demoulded, a lot of sand will stick and damage the sand mold. It will also increase the ...

AI Technical Summary

Problems solved by technology

At present, the water glass self-hardening sand molding molds used in China are all wooden molds. The surface quality of the wood molds is relatively rough, and the method of blowing carbon dioxide gas from the outside of the mold is generally used in the hardening process of the sand mold, which causes the water glass on the surface of the mold to self-cure. Poor hardening of the hard sand will cause the sand and the mold to stick together. When the mold is demoulded, a lot of sand will stick and damage the sand mold. It will also increase the workload of the workers to repair the sand mold, and it is difficult to obtain a sand mold with high surface quality.