Effect of pulse current in manufacturing of cardiovascular stent using EDM die-sinking

Pujiyulianto, Eko; Suyitno, Suyitno

doi:10.1007/s00170-020-06484-3

Cited by 16 publications

(8 citation statements)

References 19 publications

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“…Taking into account the limitations of alternating current (such as continuous and time-varying), as well as the wide application of pulse current in engineering in recent years [36][37][38], thus we select Jeffreys fluids model as a constitutive relation to describe EOF through a parallel plate microchannel driven by pulsed electric field in present work. With the aid of Laplace transform method and residue theorem, we obtain the analytical solutions of velocity and volume flow rate for pulse EOF under the Debye-Hückel approximation.…”

Section: Introductionmentioning

confidence: 99%

Time periodic pulse electroosmotic flow of Jeffreys fluids through a parallel plate microchannel

2021

Z Angew Math Mech

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The purpose of this paper is to investigate the time periodic pulse electroosmotic flow (EOF) of Jeffreys fluids through a parallel plate microchannel. The driving mode of pulse EOF here is considered as a rectangle pulse. Using the method of Laplace transform, the analytical solution of velocity and volumetric flow rate of pulse EOF is derived. The effects of pertinent dimensionless parameters on the velocity and volumetric flow rate are discussed in detail. Results show that the pulse width ā is a valuable parameter for analyzing the influence of relaxation time λ1 and retardation time λ2 on magnitude of velocity and volumetric flow rate when the fluid flow reaches the steady state. Increasing the relaxation time λ1 reduces he magnitude of velocity and volumetric flow rate at low value pulse width ā, yet the trend is opposite for larger pulse width ā. The increase of retardation time λ2 will reduce the magnitude of velocity and volumetric flow rate no matter whether the value of pulse width ā is large or not. Furthermore, the frequency of velocity profile and volumetric flow rate is different because of the different pulse width ā. With the increase of pulse width ā, the different change frequency of velocity profile and volumetric flow rate slows down, which means a long cycle time. And as the relaxation time λ1 and pulse width ā grow, the time required for the fluid flow to reach a steady state will become longer. The conclusions have theoretical significance for biofluid based microfluidic transport systems driven by pulsed electric field.

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Section: Introductionmentioning

confidence: 99%

Time periodic pulse electroosmotic flow of Jeffreys fluids through a parallel plate microchannel

2021

Z Angew Math Mech

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“…ultrasonic, magnetic was used to facilitate the flushing of the machined debris as well as electrical parameters, gap distance was varied for the same effect, gap distance was picked as one of the input variables keeping the cost in mind. Because dielectric characteristics influence heat generation and changing current results in the same output, several researchers found that current was the [25,26]; hence, current was chosen as the variable. e electrode material characteristics in uence the TWR, corner wear, and Ra, whereas change of polarity can yield good surface; hence, these two parameters were selected for investigation.…”

Section: Cause and Effect Diagrammentioning

confidence: 99%

Improving Sustainability of EDM Sector by Implementing Unconventional Competitive Manufacturing Approach

Anjani²,

Raman

et al. 2022

Advances in Materials Science and Engineering

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In this research work, an attempt was made to machine the titanium (Ti6Al4V) alloy utilizing electric discharge machining technique. The distinct process parameters and its impact on the machining performance were identified using the cause-and-effect diagram (CED). The key process parameters identified by CED diagram were current, pulse on time (Ton), aluminium oxide (Al2O3) powder concentration, and gap distance; experiments were conducted by varying the process parameters, experimental runs were designed using the Taguchi mixed orthogonal array. The experimental results revealed that improvement in material removal rate (MRR) was due to the bridging effect; reduction in tool wear rate (TWR) owing to the expansion of spark gap and enhancement in the surface roughness (Ra) was due to the complete flushing of machined debris. The interaction impact was analysed using the contour plot and with the aid of mathematical modelling experimental fits that were identified and the results were validated utilizing the sensitivity analysis. The obtained results were optimized using the technique for order of preference by similarity to ideal solution (TOPSIS) optimization technique.

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“…The whole machining surface is covered by countless discharge craters, thus causing the machining surface to be covered by a thicker recast layer [4]. Therefore, the low removal rate of molten material and poor surface quality of EDM greatly limit its extensive application in high-end manufacturing elds.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency EDM based on a composite pulse current

Yue

Sun

Fan

et al. 2023

Int J Adv Manuf Technol

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EDM technology is still facing a big bottleneck problem unsolved: low molten material removal rate, resulting in low machining speed and poor surface quality. To improve the material removal amount in each discharge process of EDM, the composite pulse current waveforms were proposed. The single pulse discharge experiments demonstrate that under the same discharge energy, the material removal volume in the discharge with the end composite pulse could be twice as high as that with the square pulse. Furthermore, due to high molten material removal rate of the end composite pulse, the thickness of the recast layer generated in the discharge with the end composite pulse was much thinner than that with the square pulse under the same discharge energy. The MD simulation results also reveal that in the discharge with the end composite pulse, the basic current mainly melted the material to form a larger molten pool, then, the inrush current, which has higher energy density and higher material removal motivity, could remove the molten pool material largely. Thus, the end composite pulse can improve the molten material removal rate and decrease the recast layer. Finally, EDM milling experiments show that higher average material removal volume in each discharge process of EDM milling with the end composite pulse was the main reason for higher material removal rate (MRR) in EDM milling with the end composite pulse. In addition, the relative tool wear ratio (RTWR) in EDM milling with the end composite pulse can be approximately equal to or slightly lower than that with the square pulse at a high material removal rate in EDM milling, which shows a great application potential of the end composite pulse in EDM.

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Effect of pulse current in manufacturing of cardiovascular stent using EDM die-sinking

Cited by 16 publications

References 19 publications

Time periodic pulse electroosmotic flow of Jeffreys fluids through a parallel plate microchannel

Time periodic pulse electroosmotic flow of Jeffreys fluids through a parallel plate microchannel

Improving Sustainability of EDM Sector by Implementing Unconventional Competitive Manufacturing Approach

High-efficiency EDM based on a composite pulse current

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