Process for induction heating gasification expanded polystyrene (EPS) evaporative pattern casting

Abstract

The invention discloses a process for an induction heating gasification expanded polystyrene (EPS) evaporative pattern casting and relates to the technical field of evaporative pattern casting. The process comprises steps of 1) producing a model, wherein the model comprises a casting head system and a casting model; 2) placing the model in a sand box and performing sand-filling and molding; 3) performing vacuum-pumping; 4) casting; and 5) cooling and taking out a casting. The modification includes that the step 2 comprises that an embedded cold iron ring and an induction coil are arranged on the periphery of a casting model of the model, and the induction coil is connected with a copper pipe electrode which is arranged on the side wall of the sand box; and an induction heating gasification casting model process is added between the step 3 in which the vacuum-pumping is performed and the step 4 in which the casting is performed, i.e., the induction oil is energized, the embedded cold iron ring is heated by the induction coil, and the casting model around cold iron is gasified. The process has the advantages that the induction heating embedded cold iron ring is used for gasifying the casting model, a die cavity is formed in the casting model, metal liquid is casted, the quantity and positions of EPS module residues are controlled, and the internal quality and pressure-resistant performance of the casting are improved.

Description

technical field [0001] The invention relates to the technical field of lost foam casting. Background technique [0002] At home and abroad, there are many ways to gasify lost foam. For example, similar to the roasting shell method of investment casting, after dipping paint on the lost foam module several times and sprinkling dry sand, it is roasted at 1000 ° C to form a shell , and then box pouring. There is also a method of using EPS defoaming reducing solution. After the conventional molding is completed, inject the EPS reducing solution from the pouring riser into the mold by dripping, pouring, soaking, etc., and the EPS bubbles will burst, reducing the volume of the pattern to 10% of the original volume. Next, it forms a gel, which can be taken out from the riser with a jig, and then the high-temperature molten metal is poured. The most commonly used method is the burning of EPS modules to form empty shells. Due to the lack of oxygen, incomplete combustion or complete ...

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