本文選題：單晶藍(lán)寶石　切入點(diǎn)：固結(jié)磨料研磨　出處：《南京航空航天大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：藍(lán)寶石以其穩(wěn)定的理化性能以及優(yōu)異的光學(xué)性質(zhì),應(yīng)用領(lǐng)域不斷拓展。作為典型的硬脆材料,單晶藍(lán)寶石高硬度和高脆性的特性使得其在加工過程中極易發(fā)生開裂,工件表面也極易形成裂紋和凹坑,這嚴(yán)重制約了藍(lán)寶石的大規(guī)模應(yīng)用。固結(jié)磨料技術(shù)將磨粒固結(jié)到研磨墊基體之中,使得磨粒軌跡可控,通過調(diào)整加工工藝參數(shù),既保證了良好的材料去除效率,又能得到比較理想的加工表面質(zhì)量。本文以固結(jié)磨料研磨加工單晶藍(lán)寶石的材料去除率為研究對(duì)象,通過分析固結(jié)磨料研磨機(jī)理,建立了固結(jié)磨料研磨藍(lán)寶石的材料去除率模型,并通過實(shí)驗(yàn)進(jìn)行了驗(yàn)證。主要內(nèi)容和研究成果如下:(1)基于固結(jié)磨料研磨過程的特點(diǎn),將材料去除看作微小磨粒微觀切削作用,通過對(duì)磨粒分布及磨粒出露的合理假設(shè),建立實(shí)際參與材料去除的有效磨粒數(shù);僅考慮出露磨粒與工件的接觸,利用研磨過程中的力平衡關(guān)系,分別建立不考慮工件彈性回復(fù)的剛塑性假設(shè)磨粒平均切深模型和考慮工件彈性回復(fù)的彈塑性平均切深模型;結(jié)合有效磨粒數(shù)和磨粒平均切深,建立固結(jié)磨料研磨藍(lán)寶石的材料去除率模型。(2)以建立的材料去除率模型為基礎(chǔ),利用MATLAB數(shù)值模擬功能繪制材料去除率隨磨粒粒徑、磨粒體積分?jǐn)?shù)、研磨壓力以及研磨速度的關(guān)系曲線,分析材料去除率與上述參數(shù)之間的關(guān)系。結(jié)果表明:剛塑性模型下磨粒粒徑對(duì)材料去除率的影響不顯著,材料去除率隨著磨粒體積分?jǐn)?shù)的增大而減小,隨著研磨壓力和研磨速度的增大而增大,彈塑性模型下的材料去除率整體明顯低于剛塑性模型下的材料去除率。(3)開展了藍(lán)寶石固結(jié)磨料研磨實(shí)驗(yàn),并將其與相同參數(shù)下兩種假設(shè)模型計(jì)算值進(jìn)行比較。結(jié)果表明:實(shí)驗(yàn)得到的材料去除率的變化趨勢(shì)與理論趨勢(shì)一致,剛塑性假設(shè)下的模型計(jì)算值與實(shí)驗(yàn)值誤差較大,彈塑性假設(shè)下的模型計(jì)算值與實(shí)驗(yàn)值誤差較小。
[Abstract]:Because of its stable physical and chemical properties and excellent optical properties, sapphire is widely used in many fields. As a typical hard and brittle material, single crystal sapphire has high hardness and brittleness, which makes it easy to crack in the process of processing. It is also easy to form cracks and pits on the workpiece surface, which seriously restricts the large-scale application of sapphire. Both good material removal efficiency and ideal surface quality can be obtained. In this paper, the material removal rate of single crystal sapphire by consolidation abrasive grinding is taken as the research object, and the mechanism of consolidation abrasive grinding is analyzed. A model of material removal rate for sapphire grinding with consolidated abrasive is established and verified by experiments. The main contents and research results are as follows: 1) based on the characteristics of abrasive grinding process, material removal is regarded as micro-cutting action of micro-abrasive. Based on the reasonable assumption of the distribution of abrasive particles and the appearance of abrasive particles, the effective number of abrasive particles involved in material removal is established, and only the contact between exposed particles and workpieces is considered, and the force balance relationship in the grinding process is used. The elastic plastic average shear depth model without considering elastic recovery of workpiece and the elastic plastic average shear depth model without considering elastic recovery of workpiece are established respectively, and the effective wear particle number and the average cutting depth of wear particle are combined. Based on the model of material removal rate, the MATLAB numerical simulation function was used to plot the material removal rate with the particle size and the volume fraction of abrasive particles. The relation curve of grinding pressure and grinding speed, and the relationship between material removal rate and the above parameters are analyzed. The results show that the effect of abrasive particle size on material removal rate is not significant under rigid-plastic model. The material removal rate decreases with the increase of the volume fraction of abrasive particles, and increases with the increase of grinding pressure and grinding speed. The material removal rate under elastic-plastic model is obviously lower than that under rigid-plastic model. It is compared with the calculated values of the two hypothetical models with the same parameters. The results show that the change trend of the material removal rate obtained by the experiment is consistent with the theoretical trend, and the error between the calculated values of the model and the experimental values under the rigid-plastic assumption is larger than that of the experimental ones. The error between the calculated value and the experimental value of the model under elastic-plastic assumption is small.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TQ164

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本文編號(hào)：1625908