Characteristics of the Polishing Effects for the Stainless Tubes in Magnetic Finishing with Gel Abrasive
Abstract
:1. Introduction
2. Materials and Methods
2.1. Gel Materials in MFGA
2.2. The Abrasive and Magnetic Finishing Materials
2.3. MFGA Set-Up and Workpiece Material
2.4. Experimental Method
3. Results and Discussion
3.1. Effects of Gel Materials on Material Removal and Surface Roughness
3.2. Effects of SiC Concentration on Material Removal and Surface Roughness
3.3. Effects of SiC Meshes on Material Removal and Surface Roughness
3.4. Effects of Steel Grit Meshes on Material Removal and Surface Roughness
3.5. Effects of Rotation Speeds on Material Removal and Surface Roughness
3.6. Effects of Currents on Material Removal and Surface Roughness
3.7. Polishing Effects on the Surface Characteristics of Stainless Tubes
4. Conclusions
- No matter which of silicone gel or guar gum was applied as the abrasive medium, the steel grit and silicon carbides could be constrained very closely in the gel medium, creating stable polishing results of stainless inner tubes in MFGA.
- In this study, adopting the guar gum as the medium to make the gel abrasive obtained a better polishing result than the silicone gel abrasive did, and the surface roughness of the workpiece could decrease from 0.646 μm Ra to below 0.056 μm Ra at a current of 3A. The RIR could reach to a best value of 91.4%.
- Smaller amounts of SiC (5 g) could be constrained on the working surface efficiently by the magnetic forces, which also induces a good finishing effect on the stainless inner tube in MFGA. Moreover, an appropriate SiC mesh (4000#) indeed played an important role in finishing the inner surface of the stainless tubes.
- A large size of steel grit (45#) could induce the strong magnetic forces to press the SiC on the working surface by the magnetic field; therefore, a good surface roughness 0.056 μm Ra could be obtained with mixing 45# steel grit into the gel abrasive.
- Since high rotation speed could make the abrasive polish the surface more times than the low rotation speed did during the same period. Gel abrasive also had good fluidity in high rotation speed, causing a good self-sharpening effect in the stainless inner tube polishing. Thus, fine machining surface of stainless tubes could be achieved after MFGA.
- The recasting layers on the inner surface of stainless tubes could be removed efficiently by MFGA when using guar gel abrasive to polish this uneven surface. Additionally, a mirror-like surface could also be fabricated using this method.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Acknowledgments
Conflicts of Interest
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Materials | Viscosity (Pa-s) |
---|---|
Silicone gel | 120.0 |
Guar gel | 1.24 |
Water | 0.0011 |
Items | Parameters |
---|---|
SiC concentration | 0.5:1, 1:1, 1.5:1 |
SiC (mesh no. of abrasive) | 2000#, 4000#, 8000# |
Steel grit (mesh no. of steel grit.) | 45#, 70#, 100# |
Rotation speed (r.p.m) | 700, 1000, 1300 |
Current (A) | 1, 2, 3 |
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Cheng, K.-C.; Chen, K.-Y.; Tsui, H.-P.; Wang, A.-C. Characteristics of the Polishing Effects for the Stainless Tubes in Magnetic Finishing with Gel Abrasive. Processes 2021, 9, 1561. https://doi.org/10.3390/pr9091561
Cheng K-C, Chen K-Y, Tsui H-P, Wang A-C. Characteristics of the Polishing Effects for the Stainless Tubes in Magnetic Finishing with Gel Abrasive. Processes. 2021; 9(9):1561. https://doi.org/10.3390/pr9091561
Chicago/Turabian StyleCheng, Ken-Chuan, Kuan-Yu Chen, Hai-Ping Tsui, and A-Cheng Wang. 2021. "Characteristics of the Polishing Effects for the Stainless Tubes in Magnetic Finishing with Gel Abrasive" Processes 9, no. 9: 1561. https://doi.org/10.3390/pr9091561