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surface because cracks are less likely to start in the interior.
Applications
The most common application of the shot peening process are components used for the automotive
drives, such as: gears, cams and camshafts, springs (cluch and coil), crankshafts, connecting rods,
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suspension leafs and springs and turbine blades. Other applications are in foundries for sand removal,
descaling, decoring and surface finishing of components that were casted, such as cylinder heads and
engine blocks. Steel products such as strip, plates, sheets, wires and bar stock are descaled in the
manufacturing process.
In machining, shot peening finds it usage for strengthening and relieving stress in components like steel
automobile crankshafts and connecting rods. In architecture it provides a muted finish to the metal
surface. Shot peening is a crucial process in suspension spring making. Types of springs include leaf
springs, extension springs, and compression springs. The most widely used applications are for engine
valve springs (compression springs) due to high cyclic fatigue.
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Fig. 6. 12 Shot peening of turbine blades
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