The purpose of this paper is to demonstrate a new process technology using the cavitation phenomenon, mainly a water-jet shock microforming, for the fabrication of a metallic foil. 304 stainless steel was exposed to a high-speed submerged water jet with different incident pressures and certain working conditions. In this experiment, a KEYENCE VHX-1000C digital microscope, confocal laser-scanning microscope (Axio CSM 700), and micro-Vickers hardness tester were utilized to observe the forming depth, surface quality, thickness distribution, and section hardness distributions under different incident pressures. The experimental results indicated that the surface morphology of the metal foils attained good geometrical features under this dynamic microforming method and there were no cracks or fracture. The forming depth and surface roughness increased with the incident pressure. In addition, the forming depth increased from 124.7 μm to 327.8 μm, while the surface roughness also increased from 0.685 μm to 1.159 μm at an incident pressure of 8 MPa to 20 MPa. Maximum thickness thinning of the formed foils occurred at the fillet region when the thickness thinning ratio was 21.27% under the incident pressure of 20 MPa, and there was no fracture at the bottom or the fillet region. The tested hardness indicated that during the cold-rolled state of the sample, the hardness sample increased slightly along the cross section of the formed region and the hardness of the annealed 304 stainless steel foils increased significantly along the cross-sectional region.

中文翻译：

---

不同入射压力下水射流冲击微成型工艺的实验研究

本文的目的是演示一种利用空化现象（主要是水射流冲击微成型）制造金属箔的新工艺技术。304不锈钢暴露于具有不同入射压力和某些工作条件的高速水下喷水枪中。在本实验中，使用了KEYENCE VHX-1000C数字显微镜，共焦激光扫描显微镜（Axio CSM 700）和micro-Vickers硬度测试仪来观察在不同入射情况下的成形深度，表面质量，厚度分布和截面硬度分布压力。实验结果表明，在该动态微成型方法下，金属箔的表面形态具有良好的几何特征，没有裂纹或断裂。成型深度和表面粗糙度随着入射压力的增加而增加。此外，成形深度从124.7增加 μ m至327.8  μ米，而表面粗糙度也从0.685增加 μ m至1.159  μ在8MPa的入射压力至20MPa米。在20MPa的入射压力下，当厚度减薄率为21.27％时，在角部区域产生的箔的最大厚度减薄，并且底部或角部区域没有破裂。所测试的硬度表明，在样品的冷轧状态下，硬度样品沿成形区域的横截面略有增加，而退火的304不锈钢箔的硬度沿横截面区域则显着增加。