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Sechi Y.,Kagoshima Prefectural Institute of Industrial Technology | Nagatsuka K.,Osaka University | Nakata K.,Osaka University
IOP Conference Series: Materials Science and Engineering | Year: 2014

Laser brazing with Ti as an active element in silver-copper alloy braze metal has been carried out for binder-less cubic boron nitride and tungsten carbide, using silver-copper- titanium braze alloys with titanium content that varied between 0.28 mass% and 1.68 mass%. Observations of the interface using electron probe microanalysis and scanning acoustic microscopy show that efficient interface adhesion between binder-less cubic boron nitride and the silver-copper-titanium braze alloy was achieved for the braze with a titanium content of 0. 28 mass%. © Published under licence by IOP Publishing Ltd. Source


Sechi Y.,Kagoshima Prefectural Institute of Industrial Technology | Nagatsuka K.,Osaka University | Nakata K.,Osaka University
Journal of Physics: Conference Series | Year: 2012

Laser brazing with Ti as an active element in Ag-Cu alloy braze metal has been successfully applied to dissimilar joining of h-BN and WC-Co alloy in Ar (99.999% purity) gas flow atmosphere without any evacuation process. Good wettability of the braze metal with h-BN and WC-Co alloy were confirmed by the observation and structural analysis of the interface by electron probe micro-analysis and scanning acoustic microscopy. The oxidation of titanium was not observed and this showed that the laser brazing with titanium as an active element in braze metal could be performed even in an Ar gas flow atmosphere without an evacuation process using a high-vacuum furnace. © Published under licence by IOP Publishing Ltd. Source


Umeda M.,Kyushu Institute of Technology | Mure Y.,Kagoshima Prefectural Institute of Industrial Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

The design tasks of cold forged products are very important because they have a great influence on the quality of the final products and the life of the forging dies. However, the design expertise required for the design tends to get scattered and lost, and therefore there is a need for a framework that will enable the accumulation, utilization and evolution of this expertise. The authors have been developing a knowledge-based system to support process planning and the design of dies and die-sets for cold forged products. The knowledge base contains design knowledge on cold forging, which is systematized based on the formal definition of die design problems and on methods with high generality for resolving these problems. These features facilitate the improvement of product quality using an exhaustive search of process plans and die structures, and the improvement of design performance by automating the design work. They also make it easier to pass on and evolve expertise by allowing design experts to self audit and maintain their own knowledge base. The proposed system has been applied to several cold forged products. Experiments show that it can generate multiple forging process plans, dies, and die-sets based on the design knowledge, and that feasible solutions can be obtained within a practical time span. © 2011 Springer-Verlag Berlin Heidelberg. Source


Kondo E.,Kagoshima University | Iwamoto R.,Kagoshima Prefectural Institute of Industrial Technology | Kobaru Y.,Kagoshima University
Advanced Materials Research | Year: 2014

Large wear of diamond tools for ultra-precision cutting of soft metals deteriorates quality of machined surface, and the worn tools have to be replaced with new tools when the tool wear reaches limited wear land width of cutting edge generating finished surface. However, it is difficult to predict the tool life since all cutting tools have individual tool life. Therefore, the purpose of this study is to estimate wear land width of cutting edge of a single crystal diamond tool having large nose radius by using static cutting forces during machining. As a result of the cutting tests and measurements, it was found that the ratio of thrust force to principal force had good relation with the ratio of flank wear land area to cutting cross section area. Furthermore, according to some detailed observation of flank wear, width of flank wear land was greatly related to uncut chip thickness obtained under different cutting conditions and it was found that width of flank wear land could be estimated by measured static cutting forces and cutting conditions. © (2014) Trans Tech Publications, Switzerland. Source


Kondo E.,Kagoshima University | Iwamoto R.,Kagoshima Prefectural Institute of Industrial Technology | Kobaru Y.,Kagoshima National College of Technology
Proceedings of the 15th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2015 | Year: 2015

Purpose of this study is to relate area of tool wear land of cutting edge with local width of wear which generates finished surface in ultra-precision cutting of aluminium alloy. To achieve this purpose, the relationship between the area of wear land and the local width of wear was experimentally investigated in ultra-precision face turning of aluminium alloy with a single crystal diamond tool having large nose radius. As a result of the cutting tests and measurements, it was found that local widths of wear land obtained under different cutting conditions were formulated by a function if local width of wear land was normalized by local uncut chip thickness, distance from top end of wear land was normalized by width of cutting cross section, and area of wear land was normalized by area of cutting cross section. Source

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