Experimental Study on Multi-pass Micro-deep Drawing Forming of Pure Titanium Foil with Different Punch Radii

This study explored the use of multi-pass micro drawing in metal plastic micro forming technology to successfully prepare micro parts with relatively large height and diameter. Specifically, three different micro drawing processes were employed to form 50 micron TA1 pure titanium foils with varying grain sizes under different punch radii. The aim was to produce micro drawing parts with diverse shapes in a diameter of 0.6 mm. Experimental results indicated that as the punch radius decreased, the deformation load increased significantly; however, this influence diminished with an increase in drawing passes. For pure titanium foil samples with small grain size, the radius of the punch had minimal impact on forming quality in multi-pass micro drawing cups. However, specimens with larger grain sizes experienced poor forming effects and deep drawing fractures when using a small punch radius. Therefore, in multi-pass micro drawing forming, it is recommended to utilize large punch radii for high-quality micro products when working with pure titanium foil blanks featuring small grain sizes.