成果報告書詳細
管理番号20160000000660
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 マルチタレット型複合加工機(ターニング・ミーリング)による複雑形状の簡易・確実・高精度な知的加工システムの研究開発 
公開日2016/8/5
報告書年度2015 - 2015
委託先名学校法人慶應義塾 国立大学法人名古屋大学 国立大学法人東京工業大学 中村留精密工業株式会社
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: Research and Development of the User-friendly, Reliable and Accurate Intellectual System for Machining Complex-shaped Parts by Multitasking (Turning & Milling) Machine Tool with Multi-turrets (FY2014-FY2018) FY2015 Annual Report

1. Contents and results on the key technology (a): “Development of technologies for optimum process plan and automatic NC program generation”
In 2015 FY, an algorism to construct the optimum process plan for a turning-milling machine tool with two turrets was proposed. A basic system to construct the optimum process plan for a turning-milling machine tool with two turrets was developed by implementing the proposed algorism. A pre-prototype of a non-contact measurement device was developed to acquire crowd points data on a cutting tool, a tool holder, and a workpiece was developed. The size of the device is 132×195×63 mm, and the measurement accuracy of it is less than 0.1 mm. A mathematical model was constructed from the acquired crowd points data. The several form parameters for avoiding collision of cutting tools were then derived by analyzing the mathematical model. According to the constructed optimum process plan, an algorism to automatically generate an NC program for operating a turning-milling machine tool with two turrets was implemented. A basic system based on the algorism was then developed.
2. Contents and results on key technology (b): “Development of intelligent technology for high accuracy and high speed machining”
We proposed and developed a novel cutting force estimator with a model-based observer which accurately estimates cutting force from servo information of each stage and spindle, i.e., motor current, motor angle and stage/spindle positon. The estimator was installed into the servo system of a prototype turning-milling machine tool with multi-turrets and evaluated from the viewpoint of the accuracy and the frequency bandwidth. From the results, the resolution of 10 N and the band width of 1 kHz were successfully achieved. Since the cutting force estimator shows the expected performance, process monitoring tests of abnormal cutting state with chatter vibration were experimentally performed in balance turning. In the process of balance turning, two turrets are simultaneously working on turning of workpiece. It is clear that the cutting force estimator can detect the large fluctuation and the frequency shift of cutting force during chatter vibration. A method to identify parameters representing cutting process and transfer function of flexible mechanical structures mounted on a traveling stage by utilizing the observer has also been developed. Disturbance force input into CNC is estimated by disturbance observer and cutting force is estimated based on the cutting force model. Analyzing influence of the estimated cutting force on the disturbance force, parameters used in the assumed models of cutting process and structural dynamics are identified. Experimental results clarified that the cutting force coefficient and the modal parameters representing the dynamic characteristics of the force transfer function can be identified accurately by the proposed method.
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