Development of hard film texture coated tool by scanning micro discharge additional processing in gas atmosphere

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K06000
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Production engineering/Processing studies
• Research Institution: Ibaraki University
• Principal Investigator: Takeyuki Yamamoto 茨城大学, 理工学研究科(工学野), 技術職員 (40396594)
• Co-Investigator(Kenkyū-buntansha): 清水 淳 茨城大学, 理工学研究科(工学野), 教授 (40292479) ; 小貫 哲平 茨城大学, 理工学研究科(工学野), 准教授 (70400447) ; 周 立波 茨城大学, 理工学研究科(工学野), 教授 (90235705) ; 尾嶌 裕隆 茨城大学, 理工学研究科(工学野), 准教授 (90375361)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 機械工作・生産工学 / 材料加工・処理 / 放電加工 / 付加加工 / 硬質皮膜 / 切削 / トライボロジ―

Outline of Final Research Achievements

In this study, a technology to directly create hard coatings with various textured patterns on the surfaces of various cutting tools or mold tools was developed by micro-discharge deposition processing in correspondent various gas atmospheres. Through basic experiments of hard film formation by micro-discharge deposition for a few different types of electrode materials, conditions suitable for film generation were searched. Taking advantage of that knowledge, a texture-like film was actually created on the flank of the cutting tool using a titanium thin electrode in a nitrogen atmosphere. As a result of cutting experiments of pure aluminum with the manufactured tool with a textured hard film, some improvement of the friction and wear characteristics on the flank of the tool was observed.

Free Research Field

機械工作・生産工学

Academic Significance and Societal Importance of the Research Achievements

各種ガス雰囲気中において金属細電極を溶融・反応させて微細な硬質皮膜パターンを創成するという方式は，独創性に富んでいる．この方法によって，直接的に各種工具上へ硬質皮膜によるテクスチャを施し，摩擦・摩耗特性の改善に活かす試みも，独創性に富んでいる．よって，工学的意義は高いといえる．
また，上述の方式により，中小企業などであっても，放電加工の設備と素材さえ整えれば，工具メーカーなどに頼ることなく，工具の長寿命化を実現しサスティナブルに利用できるため，ブレークスルーの可能性を秘めている．よって，社会的意義も高いといえる．