The injector method is based on the pressure reversal principle. In the blasting gun, compressed air is blown through the air nozzles into the blasting gun body. The air flow creates a negative pressure (optionally electronically measurable and evaluable) whereby the blasting medium is torn in via the blasting hose. At the same time the blasting medium is further accelerated with air and then hits the workpiece surface at high speed. The process can be completely monitored and even the finest adjustments are possible.
In the pressure blasting process, a pressure vessel filled with blasting medium is subjected to compressed air, which presses the blasting medium directly through the blasting hose and is entrained by the air flowing through it. In this method, a very high velocity is achieved. The advantage of this method is the exact dosage of the blasting medium (optionally electrically adjustable) and a large blasting power. The machine is basically the same as with the injector method, but it includes additionally a pressure vessel.
The blasting medium (shot) is accelerated by means of compressed air or water and is thus fired onto the workpiece surface. There, so-called dimples are produced. The shot-peening process is a surface strain hardening.
The individual dimples cause plastic deformation and create a limited compressive residual stress layer in the workpiece surface. This layer leads to a strong increase in fatigue strength and resistance to stress corrosion cracking. This process is used in the aerospace, automotive, tooling, medical, etc. Restec developed special machinery and equipment with this process mainly for the tooling, medical technology, turbine blades (gas turbines). Fully automated systems (robots) were realized here.
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