Method for conducting negative pressure casting on casting product through light-curing rapid prototyping lost foam

Abstract

A method for conducting negative pressure casting on a casting product through a light-curing rapid prototyping lost foam comprises the steps that a three-dimensional model is designed through modeling software, shelling treatment is conducted, and the light-curing rapid prototyping lost foam is obtained through printing of the SLA printing technology; the outer surface is coated with inner-layer and outer-layer refractory slurry; the light-curing rapid prototyping lost foam is further placed in a sand box provided with a bottom air exhaust structure and an air exhaust opening, the sand box is placed in precoated sand, and the precoated sand in the sand box is compacted in a vibrating mode through a sand vibrating machine; the sand box and a casting mold shell in the sand box are placed in a sintering furnace to be roasted, a casting mold shell is obtained in the sand box, pouring channels which communicate with each other are formed in the casting mold shell, and an exposed pouring opening is formed in each pouring channel; and molten metal is poured through the pouring openings of the pouring channels under the condition that negative pressure is kept, the box is opened after cooling, cleaning and other post-procedure operations of casting forming are conducted, and a final casting product is obtained. According to the method, materials are saved, the process time is short, and the production efficiency is remarkably improved.

Description

technical field [0001] The invention relates to the rapid prototyping precision casting industry, in particular to a method for negative pressure casting casting products by using light-cured rapid prototyping lost foam. Background technique [0002] Light-curing rapid prototyping investment casting technology is to replace the wax mold in investment casting with liquid photosensitive resin prototypes, that is, first print out the resin prototype layer by layer through light-curing on the light-curing rapid prototyping machine, and then pour refractory materials many times, such as Fused quartz, alumina and magnesia and other ceramic slurries to form a shell for investment casting, after drying until the shell is solidified, and then roasting to remove the resin, the obtained refractory ceramic material shell is used as a casting shell, after pouring liquid metal Cool to obtain a metal piece. [0003] In the existing photocuring rapid prototyping investment casting technolo...

AI Technical Summary

Problems solved by technology

During the roasting process of the shell, the initial decomposition temperature of the resin is relatively high, and the thermal decomposition temperature is concentrated in the local temperature range, which will generate more gas and easily crack the shell; in addition, the thermal expansion coefficient of the resin is larger than that of the refractory shell material. It is easy to cause the shell to burst, so the defects of shell expansion or bulge often appear in the process of production and use

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