Copper salt catalyzed resin sand and sand shooting molding process thereof

Abstract

The invention provides copper salt catalyzed resin sand and a sand shooting molding process thereof. The resin sand is prepared from the following raw materials of, in parts by weight, 100 parts of crude sand, 0.5-2 parts of resin and 0.05-0.5 part of a copper salt catalyst. The sand shooting molding process of the resin sand comprises the following steps of mixing the raw materials according to the ratio, mixing the sand, adding the sand into a core shooting machine, shooting the mixed sand into a mold by utilizing air pressure, heating the mold to 120-200 DEG C, preserving heat for 5-20 minutes, and curing and molding the mixed sand to obtain the resin sand. The obtained resin sand is high in strength and meets the casting requirement, and a casting obtained through casting is free of sand sticking in an inner cavity, easier to clean, high in size precision and smoother in surface.

Description

technical field [0001] The invention belongs to the technical field of casting, and relates to resin sand catalyzed by copper salts and a sand-shooting molding process thereof. Background technique [0002] Sand casting refers to the casting method of producing castings in sand molds. 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, and the casting mold is easy to manufacture, it can adapt to the single-piece production, batch production and mass production of castings. For a long time, sand casting has been the basic process in casting production. Sand casting It accounts for a large proportion of casting output in our country. Using resin sand to make cores and molding is a new sand mold and sand core preparation process developed in recent years. Compared with ordinary clay sand and water glass sand, resin sand has many advantages, and can create better econom...

AI Technical Summary

Problems solved by technology

However, this process is difficult to meet the requirements of castings with complex inner cavity dimensions and high precision requirements.

The other is sand-shot heating molding, as shown in Chinese patent application CN106825385A, after mixing pearl sand, curing agent and resin sand, it is molded into a resin sand mold sand core by sand-shot heating. Compared with traditional hot core processing technology, sand-shot molding , can save a lot of energy consumption, reduce the deformation of the core box, prolong the service life of the equipment and improve the working environment of the workers, but the current sand-shot heating molding is only suitable for thermosetting resins, not for non-thermosetting resins