SAND AND CASTING COOLING DRUMS TDR TYPE
Sand and casting cooling drum
The sand and casting cooling drum has been devised to offer modern foundries the possibility to cool sand and castings at the same time, to ease castings cleaning and to control the quantity of fines by means of an appropriate suction.
Obviously, the utilization of a sand and casting cooling drum is to be valued according to the production typology and to its undeniable advantages on the process.
Poured molds are taken from shakeout to drum by means of a vibrating conveyor. The cooling process is based on the evaporation of the residual moisture of return sand and on the evaporation of the water appropriately added by a conditioning device, which is made up of two parts: one part adds water into the charging area (according to incoming temperature) and the other part adds water into the sand discharge area, if necessary.
Vapor and fines due to process are removed by a suction and filtering system. Besides easing castings cleaning and core emptying, the rolling of castings and sand inside the drum homogenizes return sand and consequently reduces mull time.
At the end of the process, clean and cooled sand and castings pass through a screen which carries out a separation.
In brief, the main advantages are:
Sand cooling: Sand is cooled (50°C), homogeneous and with a moisture content of about 1,6 – 1,8%.
Castings cooling: Castings come out at the same temperature as the sand and can immediately be handled doing without intermediate warehouses.
Castings cleaning: The rolling of castings and sand inside the drum eases castings cleaning and core emptying and consequently reduces sandblasting times.
These results are achievable thanks to the automatic control of water addition into the drum.