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Density

Density is a characteristic of peening shot that is included in most media specifications, but is rarely measured by the user. In fact many users do not know how to measure density of their media. A density measurement can be a quick and valuable indication of the presence of large amounts of voids, porosity or other internal defects in shot particles. Particles with significant internal defects will have low density and tend to shatter and breakdown much faster than solid sound particles thus reducing average particle size and increasing the amount of unacceptable sharp edge broken pieces.

Another importance of density has to do with potential Kinetic Energy of a particle of shot. Kinetic Energy (KE) of a moving object is a product the mass of the object and its velocity. Mass of a particle is the product of its density and volume (8). As particle density increases, particle mass also increases.

Durability

Durability of shot peening media is one of its most important and complex characteristics. It can be defined as the ability of shot peening media to maintain its size and shapes during use. Media size breaks down by becoming smaller. Useful Life (UL) of peening media is how long, or how many cycles, media can endure before becoming unacceptable in size. Media shape deteriorates by forming sharp edge broken pieces. Resistance to Fracture (RTF) is how long media can resist fracturing or breaking.

Media durability influences Fatigue Resistance of parts peened, environmental concerns (dust generation and disposal), equipment maintenance and media costs.

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Material

The final characteristic that should be discussed is the material. There are a number of different materials from which to make shot peening shot. Glass beads, Ceramic beads, Cast Carbon Steel Shot, Carbon Steel Conditioned Cut Wire shot and Stainless Steel Conditioned Cut Wire Shot are the most commonly used media when peening for improved Fatigue Resistance. Glass beads, Ceramic beads and Stainless Steel shot are normally used to avoid Iron contamination of non- ferrous metal parts. Bakul Shot Company performed a test program to measure differences in Iron residue left by the three steel media.

Weight Limit for Cut Wire Shot

Shot (inch) Size (mm) Weight of 50 Random pieces
CW 62 1.6 1.090 - 0.330
CW 54 1.4 0.720 - 0.880
CW 47 1.2 0.480 - 0.580
CW 41 1.0 0.310 - 0.390
CW 35 0.9 0.200 - 0.240
CW 32 0.8 0.140 - 0.180
CW 28 0.7 0.100 - 0.120
CW 23 0.6 0.050 - 0.070
CW 20 0.5 0.040 - 0.050
CW 17 0.45 0.040 - 0.060
CW 14 0.35 0.020 - 0.040
CW 12 0.30 0.010 - 0.025

Wire Diameter Used For Cut Wire Shot

Shot Size Mean Wire (Inch) Diameter (mm)
CW 62 0.062 1.6
CW 54 0.054 1.4
CW 47 0.047 1.2
CW 41 0.041 1.0
CW 35 0.035 0.9
CW 32 0.032 0.8
CW 28 0.028 0.7
CW 23 0.023 0.6
CW 20 0.020 0.5
CW 17 0.017 0.45
CW 14 0.014 0.35
CW 12 0.012 0.30