Shot blasting room

Shot blasting room A ventilated room devoted to the cleaning of castings by the use of various grades of shot. 

The inspector then places it on a pin-type conveyor which makes it possible for the air to circulate freely around each shell, thus as-.suring that the physical properties of each forging are the same. Each conveyor hook has two pairs of pins, one above the other, holding four forgings in all. By the lime the shell reaches the final inspection room, it is completely cooled. Here the shells are given a 100 per cent inspection before they are pas.sed on to the shot blast machine which cleans the inside cavity at the rate of two every 30. sec. After the cleaning operation they are oiled inside with a pre.s-.sure gun sprayer to protect the interior from rust while in transit to the machining contractor. 

If the dimensions of the surfaces to be prepared allow, blasting is carried out in closed steel cabins equipped with a collecting and recirculation device for the repeated application of the shot. Since in these cabins the emission of dust particles cannot be excluded, it is recommendable at any rate to install them in rooms separated from bonding work. For larger surfaces so-called back-suction jet systems are recommendable, where the shot will be fed back into the jet circuit by means of a suction device concentrically arranged around the outlet nozzle. 

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