Processing characteristics and loading principle on micro blanking of cavitation jet
Abstract
This study presents a new technology of flexible micro blanking with cavitation jet to improve the quality of micro blanking parts. The cavitation jet was simulated to analyze its meteorological volume fraction and the high-pressure phenomenon caused by cavitation collapse, which is crucial for the processing. The form ability of T2 copper foils under cavitation jet blanking processing was investigated for different shapes. The incident pressure and targeted distance of cavitation jet on the micro blanking form ability is studied, and the experimental results are correlated with the simulation. Furthermore, a linear relationship was observed between the critical blanking thickness and blanking size of T2 copper foil. Based on the characterization of the experimental results, it is found that the internal stress of the regular polygon-shaped blanking parts is unevenly distributed along the blanking contour during processing, resulting in the material to tear and produce defects like flaws and incomplete forming. In contrast, the internal stresses of the circular blanking parts are evenly distributed along the blanking contour, indicating high-quality blanking. Unlike traditional plastic micro blanking, the cut edges of the blanking parts using cavitation jet technology exhibited bending and pulling without prominent shearing marks. Under moderate incident pressure, the cut edge of the blanking part has few pulling marks and small burrs, ensuring uniform and high-quality blanking.
