Blasting methods

The injector blasting principle is regarded as an efficient method of fine blasting, requiring only a small volume of compressed air.

The blasting abrasive located at the bottom in the collecting hopper is conveyed into a sand-regulating dispenser, where it gets sucked up by the injector air generated by the gun before being further accelerated by the supplied compressed air inside the body of the gun.

It is possible to influence the blasting performance by using different air and sand nozzles with various diameters. In this regard, the amount of compressed air required may increase or diminish.

The vapour blasting technique is used for a high blasting performance; requiring a large volume of compressed air.

The blasting abrasive is filled into a pressure vessel. On opening the compressed air valve, the filler valve at the top closes the vessel, which is then pressurised with the preselected compressed air regulator. Arranged at the bottom of the vessel hopper is the chamber used for adjusting the blasting abrasive compressed air mixture. The compressed air forces the blasting abrasive into the delivery nozzle to which the sandblasting hose is attached. The compressed air itself conveys the blasting abrasive through the hose to the blasting nozzle.

The "sludge blasting technique" is used in order to obtain particularly fine surfaces. The blasting abrasive and water are stirred up in the vessel located beneath the blasting cabinet to form an operating mixture which, in the standard version of this system, is then blasted under pressure at the workpiece by means of the injector action of the blasting gun.

To boost the performance, the advanced version of the system additionally incorporates a sludge conveyor pump, which pumps the water/blasting abrasive mixture under pressure through the blasting gun at the workpiece.

The refinement or levelling of a surface is achieved by filling the troughs of processing grooves with water, thereby damping the blasting action. Accordingly, it is mainly the groove peaks that are removed.

Wet blasting cabinets and automated machines are used by numerous companies for refining or deadening surfaces on precision tools, moulds, surgical and optical instruments, indexable inserts, valves and for numerous other sophisticated components.

Wet / sludge blasting