Tatsuaki FURUMOTO

High-Speed End Milling of Cemented Carbides Using Diamond-Coated Tools

Kazuki Murooka, K. Kishimoto, Tomohiro KOYANO, Akira HOSOKAWA et autres

This study aims to improve the efficiency and precision of milling WC-Co based cemented carbide (WC-Co) using the chemical vapor deposition (CVD) diamond-coated carbide tools. Five types of WC-Co materials with varying WC grain sizes and Co contents are machined at cutting …

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Development of powder bed fusion of pure copper with a 440 nm blue laser using wavelength beam combining of direct diode laser

Mitsugu Yamaguchi, Kosei Kanie, Satoshi Abe, Kentaro Miyano et autres

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Laser scan strategy for microtube building in PBF-LB/M (Heat input control based on actual laser scan speed)

Kazuya SAKURAI, Tatsuaki FURUMOTO, Satoshi ABE

Laser-based powder bed fusion of metals (PBF-LB/M) is one of the additive manufacturing (AM) techniques that enable the building of complex structures with high-precision. In particular, injection molds and die casting dies are products to which the advantages of PBF-LB/M are applied, …

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Characteristics of High-Speed Milling of WC-Co Cemented Carbide Using Diamond-Coated Carbide End Mill

Kazuki Murooka, Tadashi AKEHI, Tomohiro KOYANO, Akira Hosokawa et autres

This study aims to improve the efficiency and precision of high-speed milling WC-Co based cemented carbide (WC-Co) using the chemical vapor deposition (CVD) diamond-coated carbide tools. Side cutting experiments are carried out to clarify the characteristics of high-speed milling WC-Co. At a …

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Thermo-fluid Analysis and Experimental Investigation of the Effects of Discharge Current Waveforms on Formation of Discharge Craters in Electrical Discharge Machining

Tomohiro Koyano, Takeru Yasue, Tatsuaki FURUMOTO

In electrical discharge machining, various discharge current waveforms such as square, sawtooth, and sine waveforms have been used by various researchers, and machining speed and tool electrode wear change depending on the waveform. In this study, thermo-fluid analysis in single-pulse discharge was …

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Influence of the laser power and powder feed rate on the porosity, dilution, and building efficiency of pure copper parts fabricated via directed energy deposition with a blue laser

Mitsugu Yamaguchi, Naoki Kato, Yoshinori Funada, Taisei Yachi et autres

Abstract We examined single- and multilayer formations in the directed energy deposition for manufacturing pure copper parts using a blue laser with a wavelength of 445 nm. We investigated the influence of laser power and hatching pitch on the surface quality of …

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Building Characteristic and Spatter Behavior of Ni-Based Reuse Powder in Metal-Based Powder Bed Fusion Using Laser Beam

Mitsugu Yamaguchi, Naoya HIGASHI, Tatsuaki FURUMOTO, Jing NIU et autres

The advantage of the metal-based powder bed fusion using a laser beam (PBF-LB/M) is the recyclability of an unused powder deposited around the built part. However, this technique requires a high-power heat source to complete the building process, generating metal vapor jets …

Optimum Oxygen Concentration in Powder Bed Fusion Using Laser Beam for Building of Sc-containing Aluminum Alloy Powder.

Koichi AMAYA, Tatsuaki FURUMOTO, Haruki TSUJIKAWA, Naoki Moriuchi et autres

Powder Characteristics Affecting the Flowability of Aluminum Alloy Powder Used in Additive Manufacturing

Haruki TSUJIKAWA, Tatsuaki FURUMOTO, Naoki Moriuchi, Koichi AMAYA et autres

Metal powder utilized in the powder bed fusion using a laser beam (PBF-LB/M) is demanded to have a superior flowability not only to supply to the building platform from a powder hopper but also to form the high dense powder layer on …

Finishing Characteristics with Free Abrasive Grains and Cooling Performance of Internal Channels with Different Cross-Sectional Geometries

Mitsugu Yamaguchi, Kotaro Kushima, Shuuji Inagaki, Masao Tsuji et autres

This study investigates the finishing characteristics of internal channels with different cross-sectional geometries using free abrasive grains and evaluates the cooling performance of these channels before and after finishing. Three types of channels with circular, triangular, and hexagram cross-sections were designed and …

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Effect of Particle Size Distribution of Metal Powder on Powder Bed and Building Characteristic in Metal-Based Powder Bed Fusion with Laser Beam

Naoya HIGASHI, Tatsuaki FURUMOTO, Mitsugu Yamaguchi, Jing NIU et autres

This study focuses on the particle size distribution of the metal powder used in powder bed fusion with a laser beam (PBF-LB/M). The metal powders used in the PBF-LB/M are classified after granulation and contain a mixture of small and large powder. …

Improvement of Surface Quality of Electrochemical Machining Using Porous Electrode by Mixing Bubbles into Electrolyte

Tomohiro Koyano, Jin Yoshida, Tatsuaki FURUMOTO, Akira Hosokawa

In electrochemical machining using a porous electrode, the electrolyte flows through small pores. However, irregularities perpendicular to the direction of the electrolyte flow sometimes occur on the machined surface, resulting in high surface roughness. This is thought to be due to the …

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