Hello every one,
Hope you are doing good and staying safe.
My question is which parameter i should remain the same as parameters at intensity point to apply on peening actual part:
1. Shot type and size (sure)
2. Impact angle (sure)
3. Stand off distance (sure)
3. Shot Feed rate (not sure)
4. Nozzle size (sure)
5. Translation speed of nozzle.(not sure)
6. Blasting pressure. (not sure)
7. Rotary speed of part.(not sure)

Because i want to change some parameters above to control the required coverage. Thank you for your support.

Once you set the machine parameters and achieve the correct intensity you must continue with these settings and no more changes. If you make any changes you must repeat the saturation curve test.

Hi Jack,

Thanks for your feedback.

But i have one confusion. If i continue with these settings and no more changes, the coverage of actual peening part seems over the coverage that i expect. In this case, what should i do?

Please advise.

After your machine is set to peen to the correct intensity, the only parameter you can change is the time it takes to peen the part.

Understand that the amount of time you peen the part does not affect intensity. The part peening time ONLY affects the coverage. With that in mind, you can change the peening time of the actual part. I want to re-visit a couple of your parameters from above.

5. Translation speed of nozzle. and 7. Rotary speed of part.

These will not affect intensity, as long as the nozzle distance and media impingement angle in relation to the part surface remains the same as it was in the positive intensity test/verifications.

Jack must have overlooked those two.

There are two aspects to peening parameters; intensity and coverage. Intensity is established using a saturation curve. Once you have the correct intensity you must lock down all parameters of machine settings.
Coverage is only determined by observation of dent accumulation onto the part. You must peen your part long enough to dent the entire surface.

Thank you and appreciate your support.My concern is clear now.