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成果報告書詳細
管理番号20180000000128
タイトル*平成29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2018/6/26
報告書年度2017 - 2017
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IoT推進部
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-FY2018) FY2017 Annual Report

Forging tests of sulphonitrided dies in a factory forging line to produce a connecting rod were carried out. Now amount of wear by forging is in evaluation. Sulphonitrided steel gears are evaluated with a gear friction test. Wear of sulphonitrided gears were much smaller than non-treated and nitride ones. Noise in gear friction was also evaluated in dry friction condition. Sulphonitriding to steel gears is effective to decrease friction noise. Some of mechanical and physical properties of bulk FeS prepared by pulsed electric current sintering was evaluated to understand effects of an FeS layer of sulphonitrided surface. An advanced infrared furnace has been introduced so that high rate heating and cooling is available for preparing the sample in last year. Then, SUS445 was nitrided by the infrared furnace. The obtained SUS445N showed a higher corrosion resistance compare with SUS316L. For the evaluation of corrosion rate, it is found that a relationship between the corrosion current density and the resistance value obtained from an electrochemical impedance spectroscopy has an inverse proportionality. It is suggested that the electrochemical impedance spectroscopy method has a potential to evaluate the corrosion resistance. The thickness distribution of the plated Ni layer on the model sample piece was obtained through computer simulation. They showed good agreement with the experimental results. The electrochemical potential distribution and current density around the model sample piece and the baffle plates in the plating solution has been obtained through the advanced computer simulation. These results expected to enable to achieve optimized geometry of the shielding plate. We confirmed that simulated information of electric potential distribution and current density around the shielding plate or plating sample in plating solution were also good to get the target thickness distribution. In order to diffuse this technique to industry, we are planning instructing opportunity with the cooperation of regional industry promotion organizations and local SMEs. In the year 2017, we have focused on releasing the high-end model in the competitive field. Scroll structure is widely used as an air compressing mechanism in products such as air conditioner, freezer and air compressor. In order to achieve high efficiency and high durability, low friction and high abrasion resistance is required. This is especially important for oil-free scroll air compression, as friction occurs at dry condition in this method. As a result of our development, we have achieved friction coefficient of as low as 0.06 in dry condition by optimizing plating condition as well as chip seal material. This value is top class in the industry worldwide, and we can also expect to apply our technology to devices used in space. We will be working to optimize the process for mass production. Aiming to contribute to the surface treatment research as a whole, we are disclosing the tribology basic test equipment used in this development. This equipment enables you to set desired contact pressure, abrasion speed, sample surface temperature, test environment temperature, test environment humidity, and abrasion time.
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