No-bake resin sand for sand casting of magnesium alloy and preparation method thereof

Abstract

The invention discloses no-bake resin sand for sand casting of a magnesium alloy in the technical field of metal processing and a preparation method thereof. The no-bake resin sand comprises the following components in percentage by weight: 51 to 100 percent of fine silica sand and 0 to 50 percent of coarse silica sand; the adding amount of resin is 0.8 to 2 percent of the total weight of the fine silica sand and the coarse silica sand of resin; the adding amount of a curing agent is 20 to 60 percent of the adding amount of the resin; and the adding amount of a fire retardant is 1 to 5 percent of the total weight of the fine silica sand and the coarse silica sand. The no-bake resin sand prepared by the invention has higher intensity, good air permeability and less gas evolution. In the casting process, due to the addition of the fire retardant, the reaction and combustion between magnesium and silica sand and impurities in the silica sand can be prevented, and magnesium alloy castings with excellent surface quality can be obtained.

Description

technical field [0001] The invention relates to a material in the technical field of metal processing and a preparation method thereof, in particular to resin self-setting sand for magnesium alloy sand casting and a preparation method thereof. Background technique [0002] In my country and the world, castings produced with sand molds account for more than 80% of the total casting production. Before the 1950s and 1960s, sand castings in my country were mainly made of clay sand and water glass sand. Since the 1960s and 1970s, the resin self-setting sand process has been adopted by many cast iron, cast steel and non-ferrous alloy foundries. Widely used, resin sand has been used to produce large hydraulic turbine rotor steel castings with complex shapes, high dimensional accuracy requirements, low surface roughness, and a weight of more than 50 tons. Many machine tool factories have used resin sand to produce export machine tool castings, etc. . At present, the production of ma...

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Problems solved by technology

[0004] Further retrieval found that κ.и. Portnoy, A.A. Lebedev disclosed in "Magnesium Alloy Handbook" (Beijing: Metallurgical Industry Press, 1959) that due to its active characteristics, magnesium alloys can be used at high temperatures It will react with the impurities in the silica sand, and the heat released will further cause magnesium and SiO 2 reaction, causing serious combustion accidents

[0005] So far, there is no resin self-hardening sand that is specially used for magnesium alloy sand casting.