Silica sand for 3D printing and preparation method and application thereof

Abstract

The invention discloses silica sand for 3D printing and a preparation method and application thereof. The method comprises the following steps: grinding, magnetically separating and drying raw material silica sand, and roasting to obtain the silica sand for 3D printing. Impurities on the surface of the silica sand can be removed through roasting, the sand mold is obtained through 3D printing after the silica sand is mixed with an adhesive and a curing agent, the bonding degree between the adhesive and the silica sand in the sand mold is higher, and the strength of the sand mold is higher; when a constant-strength sand mold is obtained, the addition amount of an adhesive can be reduced, so that the gas generation amount during casting of the sand mold is reduced; and the crystalline phase of the roasted silica sand is converted into alpha phosphorus quartz, so that the expansion phenomenon of the silica sand at high temperature is reduced, and the probability that veins and air holes appear on the sand mold at high casting temperature is reduced.

Description

technical field [0001] The invention relates to the technical field of 3D printing materials, in particular to a silica sand for 3D printing and its preparation method and application. Background technique [0002] 3D printing sand core technology is an emerging molding core-making technology developed in recent years. It is characterized by efficient and fast process, green and environmentally friendly materials, and is suitable for complex precision castings. These perfectly match the requirements of modern casting technology. At present, dozens of units in China have used this process for research and development and production, and the annual sand consumption is more than 10,000 tons. With the advancement of 3D printing technology and the popularization of equipment, the consumption will double in the next few years. Silica sand is the most used raw material for 3D printing process. At present, most domestic manufacturers use resin sand process sand that has been simply ...

AI Technical Summary

Problems solved by technology

Silica sand is the most used raw material for 3D printing process. At present, most domestic manufacturers use resin sand process sand that has been simply screened. Due to the differences in the way of adding binders and the compaction of silica sand, the currently used silica sand and Compared with imported silica sand for 3D printing, there are problems such as low strength, rough surface of sand core, and large deviation of sand core strength at different positions in the sand box under the same amount of binder added. Imported silica sand for 3D printing is expensive, and Restricted by factors such as long delivery cycle and moisture-prone silica sand during sea transportation, it is of great significance to develop special silica sand for 3D printing process

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