Pulitrogis a mechanical/chemical non-abrasive process which, as a result, conveys a series of beneficial properties that go well beyond the reduction of friction, because:
- processing is carried out in aqueous solution and therefore the pieces do not undergo alterations due to overheating;
- the process is based on a surface conversion ratio that does not generate hydrogen and is therefore metallurgically safe;
- there are no damaging effects to the geometry of the parts. The material removed from the gear teeth is uniform in profile;
- this technology does not involve hazardous materials;
- • the process is repeatable and does not require any special skills on the part of the operator.
Compared to similar surface finishes produced by other methods, surfaces of this type are unparalleled in their exceptional ability to reduce friction, wear, noise, and even dynamic contact fatigue.
Only three components are required to carry out the process:
- vibration machine;
- high Density HD Media inserts;
- chemical activator.
The Media are not abrasive and do not fundamentally have friction during use, so they retain shape and size for long periods of time and the choice of the appropriate mixture improves uniformity as regards the removal of metal from the pieces to be treated. Media shapes and sizes are selected according to the geometry of the part to be treated, so for gear finishing particular attention is paid to the geometry of the tooth. In fact, where the Media cannot operate, there will be no surface improvement.
High-density ceramic Media are used simply to bring the chemical activator into contact with the workpieces and, being very smooth, do not produce scratches on the surface. The activator is also stable for a long time.
It is important to note that the chemical activator that produces the conversion reaction is by definition neutral (PH ~ 5.5) and that the process is normally carried out at room temperature.
There is therefore no possibility of hydrogen embrittlement or grinding burns, as is common in mechanical grinding operations. The main parameters governing the surface finishing operation are the number of pieces present in the machine, the concentration of the chemical activator, the flow rate of the chemical activator and the treatment time.