成果報告書詳細
管理番号20160000000659
タイトル*平成27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 次世代型高性能電解加工機の研究開発(2)
公開日2016/8/18
報告書年度2015 - 2015
委託先名国立大学法人東京農工大学
プロジェクト番号P14030
部署名IoT推進部
和文要約
英文要約evelopment of High-performance Electrochemical Machining System of Next Generation

March 31, 2016
Tokyo University of Agriculture and Technology

(1) Micro electrochemical machining
Micro machining of tungsten carbide alloy by using electrolyte jet machining with NaNO3aq solution was carried out and the machining characteristics were investigated. Furthermore, the possibility to generated complicated micro shape by scanning speed and superimposing different scan was examined experimentally. It was found that the workpiece rotational speed has an influence on the depth and the width of machined single groove.
Although the performance of an electrochemical cell can usually be represented by an equivalent circuit, the equivalent circuit for electrochemical machining (ECM) has not been well established. In this research, experiments and computations were conducted under the ECM conditions and the relationship between the parameters and the current density was investigated.
(2) Electrochemical machining for hard-to-machine materials
Micro-pins of WC alloy were fabricated by electrochemical machining using a NaNO3 aqueous solution and bipolar pulse supply. The micro-pin fabrication was carried out by changing the pulse period, the pulse width, and the power supply system. In order to understand the mechanism of machining using bipolar pulses, observations of the micro-pin surface during the process were carried out using a high-speed camera. Also, the influence of experimental conditions on the machining state was discussed.
In the case of electrochemical machining of some materials, such as titanium, passivity occurs during ECM process and the anodic dissolution stops even if the power supply is applied. This year, the machining characteristics for difficult-to-machine materials such as titanium, titanium alloy, Inconel, with Electrochemical Mechanical Polishing (ECMP) were experimentally investigated.
A tool electrode holder with a servo type force sensor designed in last year was built in trial for electrochemical discharge machining (ECDM).
(3) Electrochemical machining for complicated shapes
By using the processing system of the electrolyte suction tool, the shape generation on a nickel alloy, Inconel718 which is usually used as turbine blade material, was carried out. Firstly, relationship between the machining depth and the scanning speed was experimentally investigated by changing the scanning speed. The results show that the machining depth increases with the decrease in the scanning speed, because the dwell time of the tool becomes longer. Then, this relationship was utilized and a target shape was generated.
In the research of electrochemical machining to the internal cooling channel for molds, the tool newly developed has a wear resistance composed of a ceramics cover and flexible tube. Machining tests with ultrasonic vibration function designed showed that a small curved hole of 5mm in diameter was processed in speed 1mm/min.
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