Preparing method of high-performance easy-to-demold resin sand for nodular cast iron

Abstract

The invention discloses a preparing method of high-performance easy-to-demold resin sand for nodular cast iron. The resin sand is prepared from 40-50 parts of forsterite powder, 3-5 parts of silica sol, 1-3 parts of boron glass powder, 0.01-0.02 part of sodium lignin sulfonate, 5-9 parts of pyrophyllite powder, 2-4 parts of phenolic resin powder, 5-8 parts of pyrite powder, 4-7 parts of gypsum powder, 2-4 parts of epoxy resin powder, 0.3-0.5 part of samarium oxide, 1-3 parts of alumina whiskers, 1-3 parts of a graphene PVA emulsion, 2-4 parts of boron nitride, 1-3 parts of ferric oxide, 1-2 parts of silicon carbide, 1-3 parts of fused alumina zirconia powder, 0.2-0.5 part of cerium oxide and 0.4-0.8 part of a vulcanizing agent. According to the resin sand, through the reasonable cooperation of the components, the content of resin and a curing agent is reduced, the performance of the resin sand is improved, the ash content and water content of the resin sand are reduced, and therefore the quality of a casting is improved, the gas volume is reduced, meanwhile the quality of reclaimed sand is improved, and good circulation is formed.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a method for preparing high-performance and easy-release resin sand for nodular cast iron. Background technique [0002] In recent years, the output of ductile iron in my country has grown rapidly, and the proportion of ductile iron parts is increasing. With the continuous development of industrial technology, higher requirements are placed on the quality of ductile iron. However, in order to produce high-quality nodular In addition to strictly controlling the chemical composition of the original molten iron and selecting high-quality raw and auxiliary materials for iron castings, the temperature control before the furnace, spheroidizing treatment and inoculation treatment are also necessary for the production of high-quality ductile iron castings. . However, the traditional sand casting method has problems such as high labor intensity, high raw material consumption, ...

AI Technical Summary

Problems solved by technology

The main shaft of the fan is a large-scale casting. If it is produced by the same process, due to the thicker sand layer and poor air permeability, more air hole defects are prone to appear in the casting, thereby affecting its performance; Diesel engine crankshafts are small castings, and the top pouring method is used for pouring.

However, when pouring large parts with this method, due to the serious erosion of the mold wall and the serious stirring of the liquid metal, more inclusions are easily formed in the casting, and it is not conducive to the floating of inclusions, which affects the quality of the casting.

Because some molds adopt a split structure, the structure is relatively complicated, not only the phenomenon that the ingot is not easy to demould, stick to the mold, shrinkage cavity, surface stuttering and mold deformation due to the high casting temperature of the superalloy often occurs, which affects the quality and quality of the ingot. The service life of the mold, and the casting and demoulding process is complicated. Although it is possible to prevent the ingot from being difficult to demould and stick to the mold by adjusting the casting temperature and casting techniques, it is not easy to control, and some molds can only be used once. , the production cost is high, and they are not used for smelting low-density steel