Effect of Environmentally Friendly Oil on Ni-Ti Stent Wire Using Ultraprecision Magnetic Abrasive Finishing
Abstract
:1. Introduction
2. Experimental Method and Setup
2.1. Materials
2.2. Typical Processing Oils
2.3. Experimental Conditions
3. Result and Discussion
3.1. Effect of Light Oil on Finishing Characteristics
3.2. Effect of Olive oil on Finishing Characteristics
3.3. Effect of Castor Oil on Finishing Characteristics
3.4. Percentage Improvement in Surface Roughness (PIISR)
4. Conclusions
- 1.
- To study the characteristics of different processing oils, two types of vegetable oil (olive oil and castor oil) were used and compared with industrial light oil. The improvements in Ra with light oil, olive oil, and castor oil were equivalent to treatment at 0.07 μm, 0.08 μm, and 0.12 μm, respectively. In the cases of light oil and olive oil, the deviation in improvement was not significantly different. Therefore, the industrial oil that has been widely used in the finishing process for Ni-Ti wire can be replaced by olive oil.
- 2.
- Light oil, olive oil, and castor oil improved Ra values by 70.83%, 66.67%, and 45.83%, respectively. In each case the improvement was greater than 45.83%. The different results of improvement in surface roughness Ra can be explained based on the different value of the finishing oil’s viscosity. As the lowest viscosity is that of light oil (0.005 Pa·s), the Ra value obtained by this condition should be much better than olive oil. However, the Ra value is difficult to improve to 0.07 μm. This is probably due to the effect of another parameter such as 0.5 μm of abrasive on Ra improvement, which cannot enhance the Ra value less than 0.07 μm.
- 3.
- In terms of the removed diameter, environmentally friendly oil can reduce the diameter of Ni-Ti stent wires by 0.00281 mm after 150 s while improving the surface roughness Ra from 0.24 μm to 0.08 μm. This can be confirmed that an ultraprecision magnetic abrasive finishing process with environmentally friendly oil can reduce the surface roughness value and diameter of Ni-Ti stent wire simultaneously.
- 4.
- Olive oil exhibited excellent performance in terms of Ra and removed diameter. An EDX analysis found no components of the processing oil and or toxic substances on the surface finish of the Ni-Ti stent wire, indicating that olive oil can be applied to ultraprecision surface finishing.
Author Contributions
Funding
Conflicts of Interest
References
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Properties | Value of Properties |
---|---|
Density | 6.45 g/cm3 |
Tensile strength | 800–1500 MPa |
Tensile yield strength | 100–800 MPa |
Poisson’s ratio | 0.33 |
Elastic modulus | 70–110 GPa |
Elongation at failure | 1–20% |
Element | Spect. | Chemical Element (%) | Atomic |
---|---|---|---|
Ti K | ED | 44.69 | 49.76 |
Ni K | ED | 55.31 | 50.24 |
Total | 100.00 | 100.00 |
Processing Oil | Temperature (°C) | Viscosity (Pa·s) | Density (g/cm3) | Surface Tension (dyne/cm) |
---|---|---|---|---|
Castor oil | 26 | 0.3115 | 0.956 | 14.89 ± 1.12 |
Olive oil | 26 | 0.0341 | 0.857 | 10.00 ± 0.66 |
Light oil | 26 | 0.005 | 0.8–0.82 | 31 |
Workpiece material | Ni-Ti wire stent (L = 250 mm, D = 0.5 mm) |
Electrolytic iron powder | 0.8 g (Fe#200) |
Diamond paste | 0.5 μm (0.3 g) |
Processing oil | 0.2 mL (light oil, olive oil, castor oil) |
Magnet type | Nd-Fe-B permanent magnet (size: 20 × 10 × 10 mm3) |
Magnetic pole shape | 1 mm square edge |
Amplitude | 5 mm |
Workpiece moving feed | 80 mm/min |
Rotational speed | 500 rpm, 1000 rpm, 1500 rpm, 2000 rpm |
Processing time | 0 s, 30 s, 60 s, 90 s, 120 s, 150 s |
Frequency | 10 Hz |
Magnetic flux density in finishing zone | 520 mT |
Working gap | 2.25 mm |
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Kim, J.S.; Nam, S.S.; Heng, L.; Kim, B.S.; Mun, S.D. Effect of Environmentally Friendly Oil on Ni-Ti Stent Wire Using Ultraprecision Magnetic Abrasive Finishing. Metals 2020, 10, 1309. https://doi.org/10.3390/met10101309
Kim JS, Nam SS, Heng L, Kim BS, Mun SD. Effect of Environmentally Friendly Oil on Ni-Ti Stent Wire Using Ultraprecision Magnetic Abrasive Finishing. Metals. 2020; 10(10):1309. https://doi.org/10.3390/met10101309
Chicago/Turabian StyleKim, Jeong Su, Sung Sik Nam, Lida Heng, Byeong Sam Kim, and Sang Don Mun. 2020. "Effect of Environmentally Friendly Oil on Ni-Ti Stent Wire Using Ultraprecision Magnetic Abrasive Finishing" Metals 10, no. 10: 1309. https://doi.org/10.3390/met10101309