Casting sand for pump body sand mold casting

Abstract

The invention discloses casting sand for pump body sand mold casting, and relates to the technical field of pump casting. The casing sand is composed of, by weight, 120 parts to 130 parts of silica sand, 15 parts to 20 parts of mineral powder, 10 parts to 15 parts of sodium carboxymethylcellulose, 10 parts to 15 parts of asbestos powder, 8 parts to 12 parts of plant ash, 6 parts to 10 parts of coconut chaff, 6 parts to 10 parts of white carbon black, 5 parts to 8 parts of magnesium stearate, 4 parts to 6 parts of pectin, 3 parts to 5 parts of graphite powder, 2 parts to 3 parts of nanometer aluminum oxide and 100 parts to 150 parts of water. The casting sand has the excellent refractoriness and heat stability, and cannot have the chemical reaction with molten metal; and molding, breathability and liquid metal penetration resistance are good, and the gas-forming amount in the casting process can be reduced, so that defects of sand holes, air holes, carbon slag and the like are prevented from appearing in a pump body, and the pump body quality is improved.

Description

Technical field: [0001] The invention relates to the technical field of pump casting, in particular to casting sand for pump body sand casting. Background technique: [0002] Sand casting is a casting method for producing castings. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting. Because the molding materials used in sand casting are cheap and easy to obtain, the casting mold is easy to manufacture, and it can adapt to the single-piece production, batch production and mass production of castings. It has been the basic process in casting production for a long time. The basic raw materials for making sand molds are foundry sand and sand binder. The most commonly used foundry sand is siliceous sand. When the high-temperature performance of silica sand cannot meet the requirements of use, special sand such as zircon sand, chromite sand, and corundum sand are used. However, compared with silica sand, the price of these special sands is slightly ...

AI Technical Summary

Problems solved by technology

However, compared with silica sand, the price of these special sands is slightly higher, which increases production costs and is not suitable for small-scale foundries.