Plasma Polishing and Finishing of CVD-Diamond Coated WC (Co) Dies for Dry Stamping

Yunata, Ersyzario Edo; Aizawa, Tatsuhiko; Tamaoki, Kenji; Kasugi, Masao

doi:10.1016/j.proeng.2017.10.981

Cited by 13 publications

(4 citation statements)

References 10 publications

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“…In most of the machining processes for ultra-smooth surfaces applied in various fields such as optics, imaging, biomedical engineering, and the aerospace and automotive fields [ 1 , 2 ], polishing is usually required as a final and crucial step to remove defects and to smoothen the surfaces. Different kinds of polishing technologies have been developed, including ion beam finishing [ 3 ], bonnet polishing [ 4 ], fluid jet polishing [ 5 ], plasma finishing [ 6 ], magnetic field assisted finishing (MFAF) [ 7 ], etc. MFAF technology, being one of the most promising technologies in achieving ultra-smooth surface finishing, was first developed in the 1930s and has been widely researched and applied in various industries such as aerospace, biomedical, optics, etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effect of Surface Shape and Orientation in Magnetic Field Assisted Mass Polishing

et al. 2022

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Magnetic field assisted finishing (MFAF) technology has been widely used in industries such as aerospace, biomedical, and the optical field for both external and internal surface finishing due to its high conformability to complex surfaces and nanometric surface finishing. However, most of the MFAF methods only allow polishing piece-by-piece, leading to high post-processing costs and long processing times with the increasing demand for high precision products. Hence, a magnetic field-assisted mass polishing (MAMP) method was recently proposed, and an experimental investigation on the effect of surface posture is presented in this paper. Two groups of experiments were conducted with different workpiece shapes, including the square bar and roller bar, to examine the effect of surface orientation and polishing performance on different regions. A simulation of magnetic field distribution and computational fluid dynamics was also performed to support the results. Experimental results show that areas near the chamber wall experience better polishing performance, and the surface parallel or inclined to polishing direction generally allows better shearing and thus higher polishing efficiency. Both types of workpiece show notable polishing performance where an 80% surface roughness improvement was achieved after 20-min of rough polishing and 20-min of fine polishing reaching approximately 20 nm.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effect of Surface Shape and Orientation in Magnetic Field Assisted Mass Polishing

et al. 2022

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“…The decoating of CVD diamond films by oxygen plasma has been studied by Yunata et al [11,12] and Liu et al [13]. However, these bulk plasma-based approaches have uniformity and scalability issues.…”

Section: Introductionmentioning

confidence: 99%

Reconditioning of Diamond Coated Tools and Its Impact on Cutting Performance for CFRP Laminates

2022

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In recent years, CVD diamond-coated tungsten carbide (WC-Co) tools have been widely utilized due to their benefits in the machining of non-ferrous alloys and polymer composite materials, especially carbon-fiber-reinforced plastics (CFRPs). The reconditioning of such coated tools is economically attractive due to their high cost and short tool life. The decoating of the remaining diamond film from the used tools and the subsequent surface preparation by wet chemical pretreatment are essential steps for new CVD diamond film formation. Previously, it was shown that reactive ion beam etching (RIBE) could effectively remove CVD diamond films. However, some degree of WC-Co tool substrate damage is expected due to the high ion energy in RIBE and the chemical activity in wet etching. This study addresses the effects of RIBE decoating and surface pretreatment steps on WC-Co tools with a complex shape in terms of the ion-induced surface damage, geometry alteration, and adhesion of a subsequently re-applied CVD diamond film. Moreover, the cutting performance of the tools subjected to the RIBE decoating and repeated film deposition was studied via CFRP cutting tests. It has been shown that the RIBE decoated and recoated tools had a high level of cutting performance comparable to the new tools.

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“…Due to the signi cant performance improvement, high-e ciency, low cost and other advantages, the surface treatment technology is used in the cutting tools. At present, more commonly used surface treatment technologies are laser treatment, mechanical polishing, mechanical treatment, heat treatment and so on [2][3][4][5]. As one of the surface treatment technologies, the micro sandblasting has been widely used in the surface treatment of coated tools, because of its advantages of simple operation, high-e ciency, safety and pollution-free, high improvement of cutting performance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Micro Sandblasting on the Surface Integrity of the AlTiN Coated Tool Material

Zhou

Dong

Zheng

et al. 2021

Preprint

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Due to the high-efficiency, environmental protection the low cost, the micro sandblasting technology is used in the surface treatment of the coated tools. The simulation and application of micro sandblasting of the coated tool are carried out to reveal the surface treatment mechanism and analyze the influence of sandblasting parameters on the tool surface integrity. The flow field erosion simulation model of abrasive-water-air three-phase flow is established. The results show that the maximum velocity and pressure are obtained at the center of jet flow. The pressure distribution on the target surface has little correlation with the distance to the nozzle. The surface morphology of the AlTiN coated tool changes obviously after micro sandblasting. Moreover, the low surface roughness Ra of the blasted tool can be obtained at the small sandblasting pressure and time. Additionally, the residual compressive stress on the surface of the AlTiN coated tool is enhanced after micro sandblasting. This work has practical significance for optimizing micro sandblasting process and improving the surface integrity of coated tools.

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Plasma Polishing and Finishing of CVD-Diamond Coated WC (Co) Dies for Dry Stamping

Cited by 13 publications

References 10 publications

Experimental Investigation on the Effect of Surface Shape and Orientation in Magnetic Field Assisted Mass Polishing

Experimental Investigation on the Effect of Surface Shape and Orientation in Magnetic Field Assisted Mass Polishing

Reconditioning of Diamond Coated Tools and Its Impact on Cutting Performance for CFRP Laminates

Influence of Micro Sandblasting on the Surface Integrity of the AlTiN Coated Tool Material

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