Why Is Coated Sand Casting So Popular?

The application range of coated sand is very wide, and its process methods are not the same, whether it is modelling or core making, the basic process requirements of coated sand are: the heating temperature should be between 200-300 °C, the curing time should be about 30-150s, and the pressure of sand shooting should also be between 0.15-0.6Mpa, except for wet manual classes. The specific parameters can be adjusted according to the corresponding equipment model, complexity and type (core) weight and the type of coated sand, etc., the principle of adjustment of coated sand casting manufacturers is: if it is a simple sand core and the fluidity is better or the particle size is relatively coarse, you can choose a relatively low sand injection pressure, if it is a thin sand core, you can choose a relatively low heating temperature, and when the heating temperature is low, you can appropriately extend the curing time, and vice versa.

So why is coated sand so popular, we will introduce to you the advantages of coated sand, you will know why:

1. The collapse of coated sand is relatively good, and the castings are relatively easy to clean.

2. Coated sand also has the strength performance of suitable physical objects, which can not only be made into high-strength shell core coated sand, but also can be made into medium-strength hot-core box coated sand and low-strength non-ferrous alloy coated sand.

3. The fluidity of coated sand is also relatively good, the shape and core contour are relatively clear, and the structure is also very dense, which can make complex sand cores, such as cylinder body water sleeve core and cylinder head, etc.

4. The sand core made of coated sand by coated sand foundry manufacturers will have strong moisture resistance and long storage time, which is more conducive to transportation, storage and use.

5. The sand core made of coated sand can obtain better surface quality of castings with less paint or no coating, the roughness of the surface can reach Ra=6.3~12.5um, and the accuracy of the size can reach CT7~CT9.

6. The bad part of coated sand is that the cost is relatively high, the energy consumption is also relatively large, and the pungent smell will be produced in the process of modelling, core making and pouring of coated sand casting manufacturers. But the advantages outweigh the disadvantages, so they can also be ignored.