乱色欧美丨噜噜色av丨无码专区丰满人妻斩六十路丨婷婷婷色丨国产麻豆午夜三级精品丨日韩美女久久丨国产高潮在线丨乱人伦人妻中文字幕无码久久网丨无码精品国产一区二区免费丨亚洲精品国偷自产在线99人热丨热热色视频丨白嫩少妇和二男三p爽的大声呻吟丨夜夜偷天天爽夜夜爱丨国产色a丨亚洲人成网站18禁止无码丨91麻豆国产精品丨乱子伦农村xxxxbbb丨国产成人精品av丨香蕉视频黄版丨未满十八18禁止免费网站丨欧美激情区丨双腿张开被9个黑人调教影片丨欧美性生交大片免费看丨伊人久久五月天丨日本一二三不卡视频

【摘要】: Aluminum alloy is the main structural material of aircraft, launch vehicle, spaceship, and space station and is pro-cessed by milling. However, tool wear and vibration are the bottlenecks in the milling process of aviation aluminum alloy. The machining accuracy and surface quality of aluminum alloy milling depend on the cutting parameters, material mechanical properties, machine tools, and other parameters. In particular, milling force is the crucial factor to determine material removal and workpiece surface integrity. However, establishing the prediction model of milling force is important and difficult because milling force is the result of multiparameter coupling of process system. The research progress of cutting force model is reviewed from three modeling methods: empirical model, finite element simulation, and instantaneous milling force model. The problems of cutting force modeling are also determined. In view of these problems, the future work direction is proposed in the following four aspects: (1) high-speed milling is adopted for the thin-walled structure of large aviation with large cutting depth, which easily produces high residual stress. The residual stress should be analyzed under this particular condition. (2) Multiple factors (e.g., eccentric swing milling parameters, lubrication conditions, tools, tool and workpiece deformation, and size effect) should be consid-ered comprehensively when modeling instantaneous milling forces, especially for micro milling and complex surface machining. (3) The database of milling force model, including the corresponding workpiece materials, working condi-tion, cutting tools (geometric figures and coatings), and other parameters, should be established. (4) The effect of chatter on the prediction accuracy of milling force cannot be ignored in thin-walled workpiece milling. (5) The cutting force of aviation aluminum alloy milling under the condition of minimum quantity lubrication (mql) and nanofluid mql should be predicted.

【關(guān)鍵詞】: Milling, Aluminum alloy, Force model, Empirical model, Finite element model, Instantaneous milling force