What are the characteristics of laminated sand that make it so popular with steel foundries

Coated sand is a commonly used casting process in steel casting plants. The scope of application is very wide, and its process methods are also different. Whether it is core making or moulding, the basic casting process requirements are: heating temperature between 200-300℃, curing time between 30-150s, sand injection pressure between 0.15-0.6Mpa, except for wet manual. Specific parameters need to be adjusted according to the type of equipment, the weight of the sand core and its complexity, and the type of coated sand. The principle of adjustment is: if the shape of the core is relatively simple, on the mobility of good or coarse grain size of the coated sand, you can choose a lower injection pressure, for fine sand core, you need to choose a lower heating temperature. When the heating temperature is low, the manufacturer should appropriately extend the curing time, and vice versa.

So what are the characteristics of coated sand for steel casting plant? Next I will give you a brief introduction:

1, the fluidity is better. The core made of it has a clear profile and dense structure, and can produce more complex sand cores, such as cylinder water jacket cores, cylinder heads and so on.

2, there are strength properties compatible with the physical object, can be made of high-strength shell core laminating sand, can also be made of medium-strength hot core box laminating sand, can also be made of relatively low strength non-woven sand. Iron alloy coated sand.

3, the use of coated sand can be cast out of the surface quality of the sand core. Less plating or no plating, you can get a better surface quality of cast steel parts, surface roughness up to Ra = 6.3 ~ 12.5um, dimensional accuracy up to CT7 ~ CT9 level.

4, coated sand has many advantages, less defects in castings. But the same cost is relatively high, energy consumption is also relatively large in the high temperature or high humidity season when stored for a long time, there may also be problems such as caking.

5, good collapse, castings easier to clean.

6, the sand core anti-hygroscopicity, the existence of a long time, more conducive to storage and transport and use.

China's cladding sand technology started in the mid-1950s, 1960s had a pause. 1980s, due to the demand for products in the machinery industry, the rapid development of industry, creating industrial demand for sand. The quality of castings put forward higher requirements, thus promoting the rapid development of the production and application of sand cladding technology. Cladding sand development so far, has become an indispensable casting process in steel casting plant.

Cast steel cladding sand is a new product developed on the basis of application. With the development of the casting field in the context of industrial science and technology in the new period, the industrial market has put forward higher requirements for the surface quality and dimensional accuracy of cast steel parts. Cast steel cladding sand not only has the characteristics of traditional cladding sand in terms of strength, fluidity, core box filling and storage time.