求翻译：数控弹簧机强化工艺是利用高速运动的弹丸流对金属表面的冲击而使表面产生循环塑性应变层，由此导致该层的显微组织发生有利的变化并使表层引入残余压应力场。是什么意思？

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The numerical control spring machine strengthening craft is the use high speed movement projectile flows to the metal surface impact causes the surface to produce the circulation plastic strain level, from this causes this level the microstructure to have the advantageous change and to cause the sur

CNC spring machine technology is the use of high-speed movement of projectile impact on metal surface flow and make the surface cyclic plastic strain layer, which led to positive changes in the microstructure of layer and surface residual compressive stress field introduced.

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