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Advantages and Benefits of Conditioned Cut Wire Shot Increased Durability: Bakul Shot, because of its wrought structure, is much more durable than any other peening media, This increase in useful life can result in substantial cost savings in terms of media consumption and shot reclamation expenses. Improved Consistency: Bakul Shot is manufactured from high quality raw materials, which are then hot, and cold worked into its intermediate form – a wire. The wire is then accurately cold drawn to its final diameter and mechanical properties, cut of length, and rounder into spherical shapes. These operation and not subject to the random size, shapes and hardness variations seen in other media. Our product is much more consistent in both physical and mechanical properties. This improved consistency results in more consistent shot peening processing of your parts.

Specification	Cut Wire 0.9 mm	Cast S-330	Sieve Size
Maximum 2% on	0%	0%	16 mesh
Maximum 50% on	1.2%	17.2%	18 mesh
Cum. Min.90%	99.0%	94.7%	20 mesh
Cum. Min 98%	100%	99.8%	25 mesh

SIZE

Media size is the most frequently measured and evaluated media characteristic. Much data has been generated in the past showing that the relationship between shot size and peening intensity (1,2). As shot size increases, particle mass increases and peening intensity will also increase provided that particle velocity remains the same or greater.

Traditionally, media size has been evaluated using sieve analysis. In sieve analysis, a series of four or five sieves are stacked according to their opening size (the largest on top to the smallest on the bottom). Media is poured onto the top sieve and the sieve stack is placed in a shaking device for a specified period of time. The amount of media (weight) remaining on each sieve after shaking is measured, recorded and compared with applicable specifications. An example of sieve analysis of two different media is found in Table 1.

Shape

The second most frequently measured media characteristic is shape. It is important that shot peening media be spherical in shape and free from potentially damaging sharp edges. Figure 1 clearly shows surface damage (Cut and tears) which was caused by sharp edge broken particles. Simpson (6) plotted the influence of broken particles on Fatigue Life. As percentage of broken particles increases ; Fatigue Life decreases. Chevrolet (5) and recent data (Table 4) found that the media with lower amount of broken particles gave more consistent and higher average Fatigue Life than media with higher broken particle count. Wantanabe (4) concluded that increased amount of broken particles gradually decreases the fatigue benefit that can be achieved with shot peening.

Shot Peening Process

The shot peening process is most often used to improve fatigue properties of metal parts. In order to achieve optimum, repeatable and reliable fatigue enhancement for the shot peening process, the important shot peening parameters must be controlled. The Single most critical parameter of the shot peening process is the shot itself.

Without the correct quality media, all other peening parameters are extraneous and the desired fatigue improvement and consistency of improvement will not be achieved. It is surprising how little attention is paid, particularly during processing, to this most critical parameter. Control of peening media, both in media selection and with in-process controls, is possibly the easiest way to increase amount and consistency of fatigue improvement by shot peening.

There are six characteristics of shot peening media that are important: size, shape, hardness, density, and material.

High Resistance to Fracture: Bakul Shot is much more resistant to fracture, or breakage, than other media. As such our product tends to wear down and become smaller in size rather than fracture into sharp edge broken particles which may cause subsequent damage to the surface of the part being peened. Surface damage such as cuts, tears and embedded particles can reduce the fatigue benefits obtained with shot peening.

Surface Contamination: All shot peening processes leave a residue of the peening media on the surface of the material peened. Substantially less residue (as much as one – tenth) is left when shot peening with premier Shot compared with other media.

Dust Generation: Another unavoidable result of shot peening processes is the generation of dust during operation. Some dust is produced when peening dirty or corroded parts and cannot be influenced by the media used. But other dust is generated by the deterioration of the peening media.

Mr. Sandeep Desai / Ms. Nusrat Gajdhar (Chairman)
No. 2 - B, Industrial Area, Ujjain Road
Dewas, Madhya Pradesh - 455 001, India
Telephone: +(91)-(7272)-228575/ 229579

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