Drying method and preparation method for lost foam

Abstract

The invention discloses a drying method for a lost foam, and the drying method comprises the following steps of: step 1, sending a coated foam mold to a coating drying room, and pre-drying the coatedfoam mold under the condition of circulating hot air, wherein the temperature of the circulating hot air is 30-35 DEG C, the wind speed is 1.5M / S-2.5M / S, the wind pressure is 0.1Pa-0.6Pa, the humidityof the drying room is 30%-35%, and the drying time is 2h-3h; step 2, sending the foam mold pre-dried in the step 1 to a stokehold drying room, and drying the foam mold under the condition of the circulating hot air, wherein the temperature of the circulating hot air is 30-50 DEG C, the wind speed is 0.5M / S-1.5M / S, the wind pressure is 0.1Pa-0.6Pa, the humidity of the drying room is 15%-20%, and the drying time is 6h-8h. The invention further discloses a preparation method for the lost foam. The invention has the organic combination of realizing the humidity, the flow of air and the temperature, prevents the saturated water vapor in the coating from being in an expanded state, and the water loss outside the coating being dried and shrunk quickly to cause the phenomenon of coating cracking.

Description

Technical field [0001] The invention relates to the technical field of lost foam processing, in particular to the technical field of lost foam drying. Background technique [0002] More than 95% of the lost foam foundries in China focus on controlling product quality in the black area. But often the result is half the result with little effect. According to the statistics of foreign counterparts, more than 95% of the decision on product quality lies in the white and yellow areas. In the white area and the yellow area, the yellow area accounts for 40%. If the yellow area is being refined, the bonding process accounts for 10%, the coating process accounts for 45%, and the baking process accounts for 45%. Therefore, coating and baking processes are very important processes in the yellow zone. Here I will mainly talk about the influence of the baking process. [0003] The white area refers to the production area of ​​the foam model, the yellow area refers to the coating area, and ...

AI Technical Summary

Problems solved by technology

[0010] One of the technical problems to be solved by the present invention is how to solve the problem that the existing lost foam drying process cannot realize the organic combination of humidity, air flow and temperature well, thus causing the coating to be filled with water vapor in an expanded state, and the coating The outer part of the layer loses water too quickly and dries and shrinks, which in turn causes the coating to crack

[0011] The second technical problem to be solved by the present invention is how to solve the low performance of the lost foam coating in the prior art lost foam preparation process, poor high temperature strength, not resistant to erosion, easy to crack, etc., and the high labor cost caused by the complicated coating and hanging method , high energy consumption, long time consumption, etc., as well as the deficiency of the existing lost foam drying process, resulting in poor comprehensive performance of lost foam preparation

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