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成果報告書詳細
管理番号20170000000138
タイトル*平成28年度中間年報 次世代構造部材創製・加工技術開発 航空機用難削材高速切削加工技術開発(第二期)
公開日2017/4/15
報告書年度2016 - 2016
委託先名国立大学法人東京大学
プロジェクト番号P15006
部署名材料・ナノテクノロジー部
和文要約
英文要約Title: High Speed Machining Technology Development of Difficult-to-Machine Materials for Aircraft (FY2016-FY2017) FY2016 Annual Report 

In this project, high performance cutting of carbon fiber composite materials, titanium alloy, aluminum-lithium alloy, etc. has been studied and developed for efficiently manufacturing aircraft parts. Carbon fiber composite materials are the most important structural material of new generation aircrafts, but, high quality machining without delamination is always required. Efficient axial drilling of stack materials of carbon fiber composite material and titanium alloy is not easy, therefore, orbital drilling with an end mill has been studied for reducing cutting force and cutting temperature. In addition, robotic machining systems have been exploited for building flexible machining systems without using large machine tools. Patterning of surface by laser coating of various materials is one of promising methods for local change in surface characteristic. For the above circumstances, researches have been conducted for the five following themes: (1) high quality machining technology development of carbon fiber composite materials, (2) high quality machining technology development of advanced aluminum alloy, (3) high quality machining technology development of titanium alloy, (4) development of robotic machining technology for flexible systems and (5) patterning of surface by laser coating of various materials followed by end milling for preparing quality surface. In the machining technology development of carbon fiber composite materials, meso-scale analysis was applied to finite element method to predict the delamination, cracks and other damages. Energy method for macro-scale analysis was also performed to predict cutting forces, cutting temperature, tool wear and chip flow direction, which are necessary to optimize the orbital drilling process of the stack materials using an end mill. In the machining technology development of advanced aluminum alloy, finite element analysis of machining of this alloy was developed to investigate the specific cutting sequence, which could reduce the residual stresses generated during machining. In the machining technology development of titanium alloy, the residual stress on the hole surface by orbital drilling was investigated using XRD and it was found that compressive residual stress was reduced under certain conditions, leading to the decreased fatigue life. In the development of robotic machining technology for flexible milling systems, the relationship between the critical depth of cut and spindle speed was investigated for different postures of the robot, and it was found the posture has a little influence on the critical depth of cut. In the development of metal deposition technology for surface patterning using laser coating followed by end milling, stainless steel was coated on aluminum alloy to investigate the metallurgical conditions at the coating interface.
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