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  本文選題：碳化硅陶瓷 + 燒結(jié)金剛石鉆頭��； 參考：《江蘇科技大學》2017年碩士論文

【摘要】：碳化硅具有高硬度、耐高溫、耐腐蝕、耐磨損等優(yōu)點,被廣泛運用在國防、航天、汽車等領(lǐng)域。由于加工條件及加工成本的制約,碳化硅陶瓷在裝配時通常需要對其進行二次加工,如鉆孔、開槽等。碳化硅陶瓷具有高硬度、低斷裂韌性特點,屬于典型的難加工材料,因此針對碳化硅陶瓷的加工特性,分析了碳化硅陶瓷的磨削去除機理、刀具的胎體及結(jié)構(gòu)優(yōu)化、刀具磨損以及陶瓷裂紋擴展規(guī)律等問題,對碳化硅陶瓷的孔加工技術(shù)進行系統(tǒng)的研究。論文的主要研究內(nèi)容如下所示:(1)對碳化硅陶瓷的磨削加工機理進行了分析。通過理論分析計算與實驗觀察,研究了碳化硅陶瓷的磨削機理;通過掃描電鏡的觀察,分析了碳化硅陶瓷的材料去除方式及磨削表面特征。(2)對燒結(jié)金剛石鉆頭的性能進行優(yōu)化。一方面對燒結(jié)金剛石鉆頭的胎體配方進行了優(yōu)化;另一方面設(shè)計了正交試驗,圍繞加工效率對鉆頭的壁厚、粒度、濃度、水口數(shù)等結(jié)構(gòu)參數(shù)進行了分析,獲得了適用于碳化硅陶瓷性能優(yōu)異的鉆頭結(jié)構(gòu)。(3)建立了燒結(jié)金剛石鉆頭與陶瓷的磨損匹配關(guān)系模型,并通過試驗的方式以鉆頭的加工效率和工作壽命為評價指標對模型進行了驗證,使得建立的模型對碳化硅及其他陶瓷的加工具有指導意義。(4)針對碳化硅陶瓷加工過程中出現(xiàn)的裂紋及崩豁現(xiàn)象,對碳化硅陶瓷添加預(yù)應(yīng)力裝置,調(diào)節(jié)預(yù)應(yīng)力值,以崩豁比和崩豁深度為質(zhì)量評價指標獲得了理想的預(yù)應(yīng)力值范圍。
[Abstract]:Silicon carbide with high hardness, high temperature resistance, corrosion resistance, wear resistance and other advantages, widely used in national defense, aerospace, automotive and other fields. Due to the limitation of machining conditions and cost, silicon carbide ceramics usually need to be processed twice, such as drilling and grooving. Silicon carbide ceramics have the characteristics of high hardness and low fracture toughness, so they are typical refractory materials. Therefore, the grinding removal mechanism of silicon carbide ceramics, the matrix and structure optimization of cutting tools are analyzed according to the processing characteristics of silicon carbide ceramics. The hole machining technology of silicon carbide ceramics is studied systematically in this paper, such as tool wear and crack propagation law of ceramics. The main research contents are as follows: (1) the grinding mechanism of sic ceramics is analyzed. The grinding mechanism of sic ceramic was studied by theoretical analysis and experimental observation, and the material removal method and grinding surface characteristics of sic ceramic were analyzed by SEM. The properties of sintered diamond bit were optimized. On the one hand, the matrix formula of sintered diamond bit is optimized; on the other hand, orthogonal test is designed to analyze the wall thickness, particle size, concentration, water mouth number and other structural parameters of the bit around the machining efficiency. The model of wear matching relationship between sintered diamond bit and ceramic is established, which is suitable for the excellent performance of silicon carbide ceramic bit. The model is verified by testing the machining efficiency and working life of the bit. The model is of guiding significance for the machining of silicon carbide and other ceramics. Aiming at the cracks and collapses in the process of machining silicon carbide ceramics, the prestressing device is added to silicon carbide ceramics to adjust the prestress value. The ideal range of prestressing force is obtained by taking collapse ratio and depth of collapse as quality evaluation indexes.
【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ174.6

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本文編號：2013183