Metal Finishing Guide Book


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Page 54 of 843

Fig. 1. Typical peening intensities achieved with solid glass beads using suction-type equipment with 1/2-in. diameter nozzle at 90o for A and H, and 85o for D. material is thrown against the target. The formula: I = MV2/2 indicates that impact energy (I) equals one half the mass or weight (M) times the square of the velocity (V) at a 90o nozzle angle. Correction factors should be used for other angles. As a general rule, the smallest particle that will provide the desired effect on the surface is the most efficient one to use, as this gives the greatest number of impacts per pound of glass spheres. When the nozzle is at a 90o angle to the surface being treat- Potter's Metal Finishing Glass Beads are manufactured in ed, the bounceback of beads has multiple grades using only North America Cullet. From a "blinding" effect. This inter- tightly controlled products certified to meet stringent feres with the effectiveness of the specifications like MIL PRF-9954 & AMS 2431/6, to general blast stream and tends to increase purpose cleaning sizes, Potters offers the most choices in beads. Our cullet is tested for heavy metals to insure worker the rate of bead consumption safety and to reduce health risks associated with through breakage. Generally, an imported beads with highlevels of arsenic and lead. angle between 45 and 60o will give the most effective performance. In • Impart A Controlled, Clean Finish On A Variety of Metals some cleaning applications, still • Clean Quickly Without Significant Metal Removal lower angles may help speed the • Clean, Finish, Peen And DeBurr At Once • Can Be Recycled Many Times work. • Contains No Free Silica, Environmentally Safe The work energy of the flying • Meets Both Mil and AMS Specs for Heavy Metal Limits particles is also affected by the distance from the nozzle to the Call or e-mail anytime: 1-800-55BEADS (1-800-552-3237) Fax: 610-408-9723 work surface. It is usually best to Email: keep this between 4 and 8 in. to avoid loss of velocity, and to gain Potters respects the environment by recycling over maximum acceleration and propone billion pounds of glass each year. er diffusion of particles into the most desirable pattern. 51

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