Blasting processes

Blasting processes


Centrifugal wheel blasting In case of centrifugal wheel blasting, the centrifugal force of fast rotating wheels fitted with winnowing fans is utilised, which accelerate the blasting material mechanically and throw it onto the surface of the workpiece. At an average speed of approx. 3,000 RPM and depending on the driving power, diameter and size of the blast wheel, 60-600 kg of blasting material can be cast off, while the speed of the cast-off material is approx. 80m/s. The advantage of this system lies in the low energy input and at the same time extremely high area output. In addition to that, a highly uniform and homogenous surface is achieved.	Pressure blasting In case of pressure blasting, the blasting material is located in a closed pressure tank, the underside of which is fitted with a mixing valve. Through this mixing valve, the compressed air stream flows to the blast nozzle via the connected blasting agent tube. In this air stream, the blasting agent is dosed and already pre-accelerated alongside the tube in order to maintain the final acceleration to the desired discharge velocity in the actual blast nozzle. Due to the longer acceleration distance, discharge velocities of up to 250 m/s can be achieved in pressure blasting. Pressure blasting is mainly applied in the area of free blasting and also in high-performance blasting cabinets. The advantages lie in the high flexibility given the use of different blast nozzles, as well as in the possibility to process all blasting media (both angular and round ones).

Injector blasting The injector or venturi process functions according to the vacuum principle. From a supply tank, the blasting agent is sucked in inside a nozzle body that consists of one air and one blast nozzle and is accelerated immediately before reaching the blast nozzle. This procedure is mainly applied in specialised installations and blasting cabinets, thereby allowing a flexible arrangement of one or several nozzles. The advantage of injector blasting is that all blasting media can be processed while being exactly dosed and by applying a low blasting pressure. This allows for a targeted or partial blasting of workpieces.

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