Hinges shelling mould casting

The laminated sand generally consists of refractory material, bonding agent, curing agent, lubricating liquid and unique additives.

(1) refractory material is the main body of the composition of the laminated sand. Laminated sand casting pump body refractory material requirements for: high refractoriness, less volatiles, more round particles, solid, etc.. Generally use natural scrubbing silica sand. The requirements of silica sand are: high SiO2 content (pig iron and non-ferrous alloy castings specified above 90%, cast steel parts specified above 97%); mud content not more than 0;.3% (for scrubbing sand) - [mud content of washed sand required below; particle size ① around 3 ~ 5 sieve number; grain round, angular elements should not be greater than 1.3, acid consumption value is not less than 5ml.

Urea-formaldehyde resin is widely used in adhesives.

(3) laminated sand casting furnace bar curing agent is generally used urotox products; calcium stearate is generally used as a lubricating fluid, its role is to avoid laminated sand agglomeration, improve fluidity. The key role of the additive is to improve the characteristics of the laminated sand.

(4) the basic preparation of laminated sand components (mass concentration, %) indicates that the original sand 100 scrubbing sand urea formaldehyde resin 100.0 ~ 3.0 accounted for resin weight calcium stearate 5 ~ 7 accounted for resin weight additives 0 accounted for the original sand weight urotropine (solution 1:1).1 ~ 0.5 accounted for the original sand weight.