課程名稱機(jī)械制造技術(shù)基礎(chǔ)雙語(yǔ)a(已修改)
2025-07-06 06:22 本頁(yè)面
【正文】 教 案4課程名稱：機(jī)械制造技術(shù)基礎(chǔ)雙語(yǔ)A授課教師譚慶昌所在單位機(jī)械學(xué)院機(jī)械制造系課程類別課堂理論教學(xué)授課時(shí)間07～08學(xué)年2學(xué)期2周授課內(nèi)容2 Cutting Processes and their Control Basic Theory of Cuttingtool Deformation during the cutting process授課對(duì)象機(jī)械工程、車輛工程、農(nóng)業(yè)機(jī)械、汽運(yùn)工程、交通工程專業(yè)本科生教學(xué)內(nèi)容提要時(shí)間分配備注（b）Influence of the tool mounting position on working anglesWhen the tool tip is higher or lower than the axis of the workpiece, the working rake angle and relief angle will change.以圖211為例，如果刀尖安裝得高于工件中心，實(shí)際工作前角將大于標(biāo)注前角，工作后角將小于標(biāo)注后角。如果刀尖安裝低于工件中心，則恰好相反。When the mean line of the tool holder is not perpendicular to the feed direction, the working cuttingedge angleκr and the minor cuttingedge angleκrˊ. will change () . MaterialsA cuttingtool must have certain characteristics in order to produce goodquality and economical parts.1. Certain characteristics that a cuttingtool must have（a）High hardness and wearresistance （b）Enough strength and toughness（c）High heat resistance（d）Good heat conductivity and thermal shock resistance（e）Good processability2. Cuttingtool materials most in use(a) Highspeed steels高速鋼是加入了較多的鎢（）、鉬（）、鉻（）、釩（）等合金元素的高合金工具鋼。高速鋼具有較高的硬度（）和耐熱性，在切削溫度高達(dá)℃時(shí)仍能進(jìn)行切削；高速鋼的強(qiáng)度高、韌性好，可在有沖擊、振動(dòng)的場(chǎng)合應(yīng)用；它可以用于加工有色金屬、教學(xué)內(nèi)容提要10分鐘
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