Clay additive for sand mold casting and bonding

Abstract

The invention discloses a clay additive for sand casting bonding, which relates to the technical field of sand casting and is prepared from the following raw materials in parts by weight: 30-40 parts of attapulgite, 10-15 parts of waste engine oil, and 10-15 parts of chitin 10-15 parts of polyethylene wax, 7-12 parts of paraffin oil, 6-10 parts of nano talcum powder, 6-10 parts of linseed gum, 6-10 parts of epoxy soybean oil, 5-8 parts of polyethylene glycol , 5-8 parts of polyoxyethylene rosin acid, 3-6 parts of polyacrylamide, 2-4 parts of hydroxypropyl starch ether, 2-4 parts of sodium dodecylbenzenesulfonate, 1-2 parts of sulfur, concentrated 1-2 parts of nitric acid. The addition of the additive of the present invention can effectively improve the performance of the clay, so that the sand mold and the mold core made have a certain strength, and will not be deformed or damaged when the liquid metal is transported, fitted and poured; and the hardening speed is fast and the collapsibility is good. It can be hardened by heating, and the casting is easy to remove sand; the amount of gas generation is small, and no toxic gas will be generated during pouring.

Description

Technical field: [0001] The invention relates to the technical field of sand casting, in particular to a clay additive for bonding sand casting. Background technique: [0002] Sand casting is a casting method that produces 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, 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. In order to make the sand mold and core have a certain strength and not be deformed or damaged when handling, fitting and pouring liquid metal, it is generally necessary to add a sand binder to the casting to bond the loose sand grains together to form sand. The most widely used molding s...

AI Technical Summary

Problems solved by technology

The most widely used molding sand binder is clay. Although clay is cheap and does not produce toxic gas during pouring, its viscosity is limited and it needs to be supplemented with other additives before it can be used.