Effect of pulse Current and easiness of EDM in the hole making for strut cardiac stent CP-Ti-2

ABSTRACT

The research aims to observe the effect of EDM pulse current and the easiness of the EDM process in the hole making for strut cardiac stent CP-Ti-2 in comparison to the hole making for the strut cardiac stent AISI 316 L. The process was conducted using die-sinking EDM. It was carried out at different pulse currents (1.5 - 6.0 A). The surface roughness was evaluated, and the diameter of the crater was measured. The easiness of EDM was defined based on the pulse current, the length of the cardiac stent, the percent of tool wear, the λ Ө and λ Ө ρ theories. The result shows that the surface roughness, the crater diameter, the crater valley, and the MRR increase with pulse current. The cardiac stents CP-Ti-2 use a higher pulse current (3.0 A) compared to AISI 316 L (1.5 A). The manufacturing time for cardiac stent CP-Ti-2 is longer, and the product is shorter in length compared to AISI 316L. The percent of tool wear used in the manufacturing of cardiac stent CP-Ti-2 and AISI 316 L is 68.75 and 19.75 percent, respectively. The experimental results correlate to the λ Ө theory.

KEYWORDS:

• Stent
• EDM
• Crater
• Pulse
• Current

Disclosure statement

The Authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper, and the authors declare the following financial interests/personal relationship which may be considered as potential competing interests.

Author’s contributions

All authors have participated in (a) conception and design, or analysis and interpretation of the data; (b) drafting the article or revising it critically for important intellectual content; and (c) approval of the final version.