When individual particles of shot in a high-velocity stream contact a metal surface, they produce slight, rounded depressions in the surface, stretching it radially and causing plastic flow of surface metal at the instant of contact. In the stress distribution that results, the surface metal has induced or residual compressive stress parallel to the surface, while metal beneath has reaction-induced tensile stress. 固定作用改善了因打磨，加工或热处理所打扰的表面中应力的分布。

这principal components of shot peening equipment are a shot-propelling device, shot recycling and classification arrangements, and a work handling conveyor.

这空气爆炸方法通过重力或直接压力将镜头引入通过喷嘴引导的压缩空气流到要消除的工作中。空气爆炸方法可以以较小的镜头大小发展，通过使用长喷嘴允许对深孔和空腔的烤制，在复杂的零件上撒上小面积的射击较少，并且初始成本较低。

Methods Used For Shot Peening

常规（机械）射击 -
Conventional shot peening is done by two methods. Method one involves accelerating shot material with compressed air. Shot is introduced into a high velocity air stream that accelerates the shot to speeds of up to 250 ft/s. The second method involves accelerating the shot with a wheel.


Laser-shot Peening –

Laser-shot peening utilizes shock waves to induce residual compressive stress. The primary benefit of the process is a very deep compressive layer with minimal cold working. Layer depths up to 0.40” on carburized steel and 0.100” on aluminum alloys have been achieved. Mechanical peening methods can only produce 35% of these depths.

双尿
双重peing进一步增强了单个射击操作的疲劳性能，通过第二次重新点击相同的表面，并以较小的射门和较低的强度重新效果。第二次将表面固定在山谷中，进一步增加了表面的压缩应力。

Strain Peening
双锤击增加压度假在哪里s on the outer surface of the compressive layer, strain peening develops a greater amount of compressive stress throughout the entire compressive layer. This additional stress is generated by preloading the part within its elastic limit prior to shot peening. When the peening media impacts the surface, the surface layer is yielded further in tension because of the preloading. The additional yielding results in additional compressive stress when the metal’s surface attempts to restore itself.

Parameter Selection

射击参数的选择取决于各种条件：

1. Knowledge of the application of the component
2. Component geometry
3. Manufacturing method
4. Mechanical properties of the base material
5. 基本材料的应变灵敏度
6. Environment
7. Service conditions, loads and cycles
8. Cost sensitivity

Application of Shot Peening

经过一些制造过程

诸如研磨，电排放加工（EDM），电镀，电化学加工（ECM），阳极氧化，等离子体，脱氧化等过程

• 喷气发动机刀片
• 连接杆
• Crankshafts
• 齿轮
• 轴和轴
• Springs
• Torsion Bars

Benefits Of Shot Peening

1. 增强疲劳强度。
2. Improves ultimate strength.
3. 防止因磨损而破裂。
4. Prevents corrosion.
5. 防止烦恼。
6. Possible to increase the fatigue strength of damaged parts extending the wear.
8. 通过产生润滑剂可以积聚的小毛孔来增加润滑性。
9. 留下均匀纹理的，成品的表面，准备立即使用或涂料和涂料。
10. Can be used to curve metal or straighten shafts without creating tensile stress in a Peen forming process.

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