成果報告書詳細
管理番号20150000000437
タイトル*平成26年度中間年報 SIP(戦略的イノベーション創造プログラム) 革新的設計生産技術 市場流通材のスーパーメタル化開発
公開日2015/7/18
報告書年度2014 - 2014
委託先名国立大学法人長岡技術科学大学
プロジェクト番号P14030
部署名ロボット・機械システム部
和文要約
英文要約Title:SIP (Cross-Ministerial Strategic Innovation Promotion Program) / Innovative Design/Manufacturing Technologies Development of super metals by processing of metallic raw materials (FY2014-FY2015) FY2014 Annual Report

Current sulphonitriding of tool steels were carried out to understand current process and the properties of the sulphonitrided zone. Adie steel (JIS-SKD61) and a Cr-Mo steel (JIS-SCM435) were used as samples. The sulphonitriding process was conducted at 520°C for 25 h in a steam of NH3. In the beginning of the process, H2S-containing gas was introduced simultaneously for 0.5 h. The sulphide zone was formed on the top surface in 5 μm. The nitrided zone was formed below the sulphide zone in 20 μm in JIS-SKD61 and in 30 μm in JIS-SCM435. Nitrided zones determined by the microstructure observed by using the optical microscopy were in agreement with the Vickers hardness profile. Sulphonitrided hummer dies were produced for conducting hummer forging tests to investigate lifetime of dies.
We investigate corrosive resistance of a stainless steel by nitriding heat treatment in this project. In this year, we performed a corrosion test of nitriding heat treated sample and thermal analysis of vacuum heat treatment furnace using thermal simulation and actual temperature measurement. As a result, the followings are found. First, it is found that there is something relationship between corrosive resistance of nitriding stainless steel and its surface color by microscope observation. Second, result of thermal simulation shows that temperature distribution occurs during nitriding heat treatment using a jig. Finally, actual temperature measurements were carried out for improving temperature precision of vacuum heat treatment furnace at Nakatsuyama Heat Treatment Co., Ltd. The obtained data will be used next thermal simulation for understanding furnace of factory.
Research and development have been made through a collaboration with Nohin Mekki Industry Co.,Ltd and Corp. Konishi Plating. The main result is as follows. “On-Demand plating bath” was designed and fabricated for the purpose of on-site-oriented R & D of plating. The plating baths were equipped in both Nohin Mekki Industry Co.,Ltd and Corp. Konishi Plating. Final products can be directly fabricated through the “On-Demand plating process” without any scale-up process. Several apparatus such as a power supply, a rectifier, electrodes, bus bars, a thermo controller, a local ventilation device, a rotating unit, a filtration device, a pH controller and so on were also equipped in the manufacturing sites. Three types of plating substrate were designed and fabricated. They were designed and configured to have typical shape in each. We call them as “On-Demand plating piece”. Ununiformity of film thickness will be clearly checked by plating of the On-Demand plating pieces on fabrication site. Nickel and iron plating solution were optimized in order to develop hard plated films by addition of amino acids in plating baths. Moreover, the On-Demand plating pieces were plated in both Nickel and Iron plated baths. Remarkable ununiformity in plated thickness is expected in the pieces because no baffles were used in the plating process. In particular, thick films were plated on projection parts of the plating pieces.
As a dispersant for stably dispersing a CNT in the plating solution, it was possible to obtain a good CNT composite plating solution with the use of polysaccharides. The type of polysaccharides and CNT has revealed that influence the dispersibility of the plating solution. Therefore, by performing the dispersed test using various types of CNT, it was possible to select the combination of stably dispersed to the material in the plating solution .
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