Simultaneous Nano-Texturing onto a CVD-Diamond Coated Piercing Punch with Femtosecond Laser Trimming

Aizawa, Tatsuhiko; Shiratori, Tomomi; Kira, Yoshihiro; Inohara, Tadahiko

doi:10.3390/app10082674

Cited by 14 publications

(16 citation statements)

References 16 publications

(23 reference statements)

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“…The diamond-coated WC (Co) punch with a diameter of 1.958 mm was prepared and trimmed by the femtosecond laser system. The same trimming conditions as defined in [ 15 ] were utilized in this processing. The diamond-coated WC (Co) punch edge radius was measured to be 2.75 μm.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the optical interaction between the scattering beams on the rough surface and the incident beam, the laser-induced periodic surface structuring (LIPSS) takes place together with the trimming processes [ 14 , 15 ]. Nanotexturing to diamond films by LIPSS is made by using the nanoablation via the femtosecond laser irradiation [ 13 , 14 , 15 ]. Under the laser irradiation conditions in the above, the LIPSS period is estimated to be 250 nm [ 17 ].…”

Section: Methodsmentioning

confidence: 99%

“…Among the treatment methods of diamond coating using beam irradiation processes, the femtosecond laser machining system was developed to adjust the punch head and side surface conditions, to sharpen the punch edge and to form the nanotextures onto the side surface [ 13 , 14 , 15 ]. As stated in [ 16 , 17 ], the treated surfaces are distorted and severely roughed by the thermal effect when using the nanosecond and continuum wave lasers.…”

Section: Introductionmentioning

confidence: 99%

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Femtosecond Laser Trimming with Simultaneous Nanostructuring to Fine Piercing Punch to Electrical Amorphous Steel Sheets

et al. 2021

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A CVD (Chemical Vapor Deposition) diamond coated tungsten carbide (WC) and cobalt (Co) sintered alloy punch was trimmed by the femtosecond laser machining to sharpen its edge with about 2 μm and to simultaneously make nanostructuring to its side surface. In addition to the sharpened edge, its edge profile was formed to be homogeneous enough to reduce the damage layer width by piercing the electrical amorphous steel sheet stack. Each brittle sheet in the stacked work was damaged to have three kinds of defects by piercing; e.g., the droop-like cracking in the thickness and at the vicinity of hole, the wrinkling in peak-to-valley with partial cracking on the peaks, and the circumferential cracking. When using the WC (Co) punch with the inhomogeneous edge profile in the sharpened edge width, these three damages were induced into each sheet and the maximum damage width exceeded 80 μm. When using the punch with the sharpened edge and homogeneous edge profile, the wrinkling mode was saved and the total affected layer width was significantly reduced to less than 20 μm. Through the precise embossing experiments, this effect of punch edge profile condition to the induced damages was discussed with a statement on the nanostructuring effect on the reduction of damaged width in electrical amorphous steel sheets. The developed tool with the sharpened edge and homogenous edge condition contributes to the realization of a low iron loss motor with a reduced affected layer width.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Femtosecond Laser Trimming with Simultaneous Nanostructuring to Fine Piercing Punch to Electrical Amorphous Steel Sheets

et al. 2021

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“…The femtosecond laser micromachining is suitable to trimming and nanotexturing the CVD-diamond coated WC (Co) punches [29][30][31] for ultrafine piercing of metallic sheets [29][30][31][32]. Figure 2b depicts the standard setup for this laser trimming and nanotexturing.…”

Section: Trimming and Nanotexturing By Femtosecond Laser Irradiationmentioning

confidence: 99%

Laser Treatment CVD Diamond Coated Punch for Ultra-Fine Piercing of Metallic Sheets

Aizawa¹,

Inonara²,

Yoshino³

et al. 2021

Engineering Applications of Diamond

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CVD-diamond coated special tools have been widely utilized to prolong their tool life in practical production lines. WC (Co) punch for fine piercing of metallic sheets required for high wear-toughness to be free from chipping and damages and for high product quality to punch out the holes with sufficient dimensional accuracy. The laser trimming process was developed to reduce the surface roughness of diamond coating down to submicron level and to adjust its diamond layer dimensions with a sharp punch edge for accurate piercing. The pulsed laser irradiation was employed to demonstrate that micro-groove was accurately formed into the diamond coating. Less deterioration in the worked diamond film by this laser treatment was proved by the Raman spectroscopy. The femtosecond laser trimming was proposed to sharpen the punch edge down to 2 μm and to form the nano-textured punch side surfaces with the LIPSS (Laser Induced Periodic Surface Structuring)-period of 300 nm. Fine piercing experiments were performed to demonstrate that punch life was significantly extended to continuous punching in more than 10,000 shots and that mirror-shining hole surfaces were attained in every shot by regularly coining the nanotextures. The sharp punch edge with homogeneous edge profile was responsible for reduction of the induced damages into work sheet by piercing. The punch life was extended by the ejection mechanism of debris particles through the nanotextures on the punch side surface. The present laser treatment was useful in trimming and nanostructuring the complex-shaped punch edge for industrial application.

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“…A new printing system is necessary to duplicate the tailored micro-and nano-patterns onto the metallic sheets and plates and to fabricate the functionally decorated devices and parts. Femtosecond laser processing becomes a powerful tooling system to print the microtextures as well as the nanotextures onto any material substrates [14][15][16]. In particular, LIPSS (Laser Induced Periodic Surface Structuring) [17] forms various nanotextured morphologies on the work material 2 of 10 surface with different LIPSS-ripple periods in the function of laser beam capacity such as fluence and pulse width in addition to the work surface condition.…”

Section: Introductionmentioning

confidence: 99%

Micro-/Nano-Texturing of Aluminum by Precise Coining for Functional Surface Decoration

Aizawa

Yoshino

Inohara³

2020

Metals

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The AISI316 austenitic stainless steel die was prepared and nitrided at 673 K for 14.4 ks. Through this low temperature plasma nitriding, the AISI316 die was homogeneously hardened up to 1400 HV within its surface layer of 50 μm. This nitrided AISI316 die was utilized to print the tailored micropattern with nanotextures onto its surface by the femtosecond laser processing. Each micropattern consisted of the tailored segments to have unidirectional nanotextures with different orientations. Each segment was recognized by its intrinsic surface plasmonic brilliance to tailored nanotextures. The CNC (Computer Numerical Control) stamping system was used to coin these micropatterns with nanotextures onto the AA1060 aluminum plates with the thickness of 1 mm. SEM (Scanning Electron Microscopy) and optical microscopy were employed to characterize the original micro-/nano-textures on the AISI316 die as well as the coined nanotextured patterns on the AA1060 plate surfaces.

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Simultaneous Nano-Texturing onto a CVD-Diamond Coated Piercing Punch with Femtosecond Laser Trimming

Cited by 14 publications

References 16 publications

Femtosecond Laser Trimming with Simultaneous Nanostructuring to Fine Piercing Punch to Electrical Amorphous Steel Sheets

Femtosecond Laser Trimming with Simultaneous Nanostructuring to Fine Piercing Punch to Electrical Amorphous Steel Sheets

Laser Treatment CVD Diamond Coated Punch for Ultra-Fine Piercing of Metallic Sheets

Micro-/Nano-Texturing of Aluminum by Precise Coining for Functional Surface Decoration

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