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題名 | The Analysis of Coolant Flow and Heat Transfer in Griding=磨削中冷卻液流性與熱傳之分析 |
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作者姓名(中文) | 張仲卿; | 書刊名 | 力學 |
卷期 | 12:4 1996.12[民85.12] |
頁次 | 頁513-524 |
分類號 | 446.895 |
關鍵詞 | 磨削; 多孔性磨輪; 慢速進刀磨削; 傳統磨削; Grinding; Porous wheel; Creep feed grinding; Conventional grinding; |
語文 | 英文(English) |
中文摘要 | 本文主要目的是建立一個通用模式可精準預測磨削過程中流體壓力分佈( hydrodynamic pressure )、流體滲透深度( depth of penetration )、有效冷卻液流量 ( flow-rate of useful coolants )、 及最大磨削溫度( maximum grinding temperature )。 首先我們視磨輪為一實心圓盤帶著粗糙多孔性外緣,在磨削的機構中,是由多孔性之磨輪高 速拋光工作之表面, 噴嘴射出冷卻液撞擊磨輪與工件之接觸面, 在此進口間隙( inlet zone )形成流體液動壓力( hydrodynamic pressure ),迫使部份冷卻液滲透入多孔性磨 輪,達到冷卻研磨面之效果。為求液動壓力和冷卻液滲透深度,我們應用熱液動潤滑理論( thermohydrodynamic theory of lubrication ), 並考慮由噴嘴射出冷卻液之撞擊壓力( ram pressure )效應,然而熱傳問題則利用區域體積平均理論( local volume averaging method )推導其主要能量方程式,計算其磨削之溫度分佈。 由本數學理論模式所計算結果,與實驗數據比較,在慢速進刀磨削( creep feed grinding )或傳統磨削( conventional grinding )中, 使用水性或油性之冷卻液都獲得非常好結 果。 |
英文摘要 | The main purpose of this work is to construct a comprehensive model that can precisely predict the hydrodynamic pressure distribution, the penetration depth of fluid, and the maximum temperature in grinding. We view the grinding wheel as a solid disk with a rough porous outer rim. This porous wheel is rotated at high speed and is slid against a smooth plane surface, the workpiece. Portion of the supplied coolant is forced into the pores of the wheel by a hydrodynamic pressure which develops ahead of the contact. To solve for the hydrodynamic pressure, and thus for the depth of penetration of the coolant into the wheel, we apply the thermohydrodynamic theory of lubrication, recognizing that the upstream pressure boundary condition is given by a ram pressure effect. Heat transfer into the fluid that fills the pores is calculated by means of local volume averaging of the governing equations. With this application of lubrication theory and local volume averaging method, we obtain excellent agreement with experimental data for workpiece temperature distribution, including the maximum temperature, in both conventional and creep feed grinding, and for both water and oil coolants. |
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