Hi
I'd like your input on a problem I'm having with a glass bead peening application. I have to shot peen threads in a 9.750 dia bore. The spec calls for 0.009/0.018N intensity, 200% coverage min and I have to use AGB-10 (Mil-11) glass bead because to thread root radius (which is 0.010"). I'm using a rotary lance with a T245-6 Boride nozzle, which has a single 3/8" outlet. currently with 100 PSI I can't go higher than 0.008N. Optimisation was performed to find the media flow that woudl give me the highest arc heigth (because it's regulated through a manual valve) and then saturation curves were generated for a few pressure steps at that media flow.

Any ideas?

Most specifications call for the nominal bead diameter to be 50% max of the root radius. You state you are using AGB-10 which has a nominal diameter of .0039" You could use AGB-12 it's nominal diameter is .0047".

Another option would be to rotate the part around the lance. This way you could degrease your standoff distance. Is your lance a 45 degree or 90 degree? Using a 45 degree will also help increase the arc height but you will have to peen the part from both ends.

Hope that helps,

-Walter

You may want to look at the Hollo-Blast nozzle HBB-1 Stock #21190. We have been able to get a higher peening Intensity with the Hollo-Hlast as compared to a side angle, when using steel shot. Or in many cases ceramic can be used in place of glass beads. Glass Beads=about 90 lb per cu ft, Ceramic=about 150 lb per cu ft and increases the intensity. I would suggest starting with B-120 Ceramic .003 to .005 inches 120 to 200 mesh.

Herb Tobben
CLEMCO INDUSTRIES CORP.
PH: 636-239-8172
FAX: 636-239-9272