Coremaking on machines
Coremaking on sand blowing machines in hot boxes is that the rod mixture with fast-curing binder is blown on sand blowing car in pre-heated core box at a temperature depending on the composition of the binder is equal to 220-280 ° C. Under the influence of heat the core box binder is heated and hardens within 15-60 sec. The resulting rods have high durability, eliminates the use of frames, do not require additional drying, have high dimensional accuracy, surface clean, good gas permeability (even without making them special ventilation systems), light extraction of castings.
The process of high-efficiency, easy to complete automation. However, the complicated design of core boxes and increases their value, requires the use of more powerful ventilation systems to remove gaseous substances released during the curing of the rods. In addition, the synthetic resin used and the roads are scarce.
The disadvantage sand blowing method of manufacturing the rods is a great air flow, a relatively weak seal large rods and the need for core sands with low wet strength, which creates a risk of damage when removing the rods and transportation.
More efficient and sophisticated machines are core shooters.
For the manufacture of rods of different configurations core shooters machines are equipped with replaceable nozzles. Performance of the machines is 250 – 300 cores per hour,
On semi-automatic core shooter are made of up to 6 kg in boxes with vertical or horizontal connector.
Coremaking on sand blowing machines in hot boxes is that the rod mixture with fast-curing binder is blown on sand blowing machine in pre-heated core box at a temperature depending on the composition of the binder is equal to 220-280 ° C.
In the mold-making machine-applied to the sand plant forming a homogeneous mixture, do not fall into the filling and tiling. In this case, the addition of fresh materials make up 15% of the total weight of the sand mixture.
The rods are made of special core boxes. Rod in a circle filled with molten metal, heated to high temperatures. Therefore, the material of which produce rods, special requirements: a high dry strength, low water absorption, light extractingof the casting.
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