本文選題：高頻感應(yīng)釬焊 + 多晶CBN磨粒��； 參考：《南京航空航天大學(xué)》2017年碩士論文

【摘要】：多晶立方氮化硼(CBN)磨粒是由CBN微晶顆粒與AlN粘結(jié)劑通過高溫高壓燒結(jié)而成的聚晶體超硬磨粒,它既具有單晶CBN磨粒的高硬度和高耐磨性,又具有各向同性的特征,在磨削時通過磨粒微破碎自銳能夠確保砂輪長時保持高鋒利度。此外,采用高頻感應(yīng)釬焊技術(shù)制作單層超硬磨料砂輪,能夠有效解決真空爐中釬焊制造砂輪產(chǎn)生的基體變形問題,在確保釬焊砂輪牢固把持磨粒的同時,也能顯著提升砂輪精度。因此,感應(yīng)釬焊單層多晶CBN砂輪的制造與應(yīng)用研究具有重要理論意義和實用價值。然而,現(xiàn)階段對感應(yīng)釬焊多晶CBN磨粒的內(nèi)部應(yīng)力分布特征、以及磨粒自銳性能及其機理仍缺乏深刻認(rèn)識,導(dǎo)致多晶CBN砂輪的優(yōu)異磨削潛能難以充分發(fā)揮。有鑒于此,本文提出開展高頻感應(yīng)釬焊多晶CBN超硬磨粒自銳性能研究,以揭示感應(yīng)釬焊多晶CBN砂輪制造過程的溫度場特征為基礎(chǔ),闡明多晶CBN磨粒內(nèi)部殘余應(yīng)力與磨削應(yīng)力的影響因素與分布規(guī)律,再結(jié)合單顆磨粒磨削實驗闡釋多晶CBN磨粒的微破碎行為,以此揭示磨粒自銳機理。研究成果有利于深化對高頻感應(yīng)釬焊單層多晶CBN超硬砂輪制造與應(yīng)用相關(guān)機理的認(rèn)識。本文的主要研究工作與取得的成果如下:(1)采用實驗和仿真相結(jié)合的方法,研究了高頻感應(yīng)釬焊制造單層CBN砂輪時加熱微區(qū)的溫度分布特征,闡明了感應(yīng)電流大小、電流頻率、加熱間隙以及掃描速度對感應(yīng)釬焊最高溫度的影響規(guī)律。研究發(fā)現(xiàn),在感應(yīng)電流頻率為1MHz和加熱間隙2mm的條件下,感應(yīng)電流幅值和掃描速度分別為19A和0.5mm/s、20A和1mm/s、以及21A和1mm/s時,感應(yīng)釬焊的溫度分布適合制作單層多晶CBN砂輪。(2)采用泰森分割方法建立了多晶CBN磨粒的微結(jié)構(gòu)模型,分別計算了多晶CBN磨粒的釬焊殘余應(yīng)力分布與磨削合應(yīng)力分布,揭示了包埋深度、磨粒粒徑以及磨削力等參數(shù)對磨粒內(nèi)部應(yīng)力分布的影響規(guī)律,優(yōu)選了包埋深度。通過單晶與多晶CBN磨粒釬焊殘余應(yīng)力的對比分析,以及釬焊多晶CBN砂輪的磨削試驗,驗證了釬焊應(yīng)力計算結(jié)果的準(zhǔn)確性。(3)通過單顆磨粒磨削鈦合金TC4試驗,從多晶CBN磨粒的磨損形貌及其分形維數(shù)兩方面闡明了磨削用量對磨粒微破碎自銳行為的影響規(guī)律與作用機理。進一步研究發(fā)現(xiàn),不同于單晶CBN磨粒容易出現(xiàn)大塊破碎和斷裂,多晶CBN磨粒由于更容易發(fā)生微破碎,因而磨削性能更加穩(wěn)定。
[Abstract]:Polycrystalline cubic boron nitride (CBN) abrasive particles are polycrystalline superhard abrasive particles sintered by CBN microcrystalline particles and AlN binders through high temperature and high pressure. It has the characteristics of high hardness and high wear resistance of single crystal CBN abrasive particles, and also has the characteristics of isotropy. The grinding wheel can be kept high sharpness when grinding by micro-crushing and self-sharpening. In addition, using high-frequency induction brazing technology to make single-layer super-hard abrasive grinding wheel can effectively solve the problem of matrix deformation caused by brazing and manufacturing grinding wheel in vacuum furnace. It can also improve the precision of grinding wheel. Therefore, the manufacture and application of induction brazing monolayer polycrystalline CBN grinding wheel has important theoretical significance and practical value. However, there is still a lack of deep understanding of the internal stress distribution characteristics of induction brazed polycrystalline CBN abrasive particles, as well as the self-sharpening properties and mechanism of the abrasive particles, which makes it difficult to give full play to the excellent grinding potential of polycrystalline CBN grinding wheels. In this paper, the self-sharpening properties of high-frequency induction brazing polycrystalline CBN superhard abrasive particles are studied, which is based on revealing the characteristics of temperature field in the manufacturing process of induction brazed polycrystalline CBN grinding wheels. The influencing factors and distribution of residual stress and grinding stress in polycrystalline CBN abrasive particles are expounded, and the micro-breaking behavior of polycrystalline CBN abrasive particles is explained in combination with the grinding experiment of single abrasive particle, so as to reveal the self-sharpening mechanism of polycrystalline CBN particles. The research results are helpful to deepen the understanding of the manufacturing and application mechanism of high frequency induction brazing monolayer polycrystalline CBN superhard grinding wheel. The main research work and results obtained in this paper are as follows: (1) by using the method of experiment and simulation, the characteristics of temperature distribution in the heating microzone of high-frequency induction brazing manufacturing single-layer CBN grinding wheel are studied, and the magnitude and frequency of inductive current are clarified. The effect of heating gap and scanning speed on the maximum temperature of induction brazing. The results show that when the inductive current frequency is 1MHz and the heating gap 2mm, the amplitude and scanning velocity of the induced current are 19A and 0.5mm / s respectively, 20A and 1mm / s, and 21A and 1mm/s, respectively. The temperature distribution of induction brazing is suitable for making monolayer polycrystalline CBN grinding wheel. The microstructure model of polycrystalline CBN abrasive particles is established by Tyson partition method. The residual stress distribution and grinding stress distribution of polycrystalline CBN abrasive particles are calculated respectively. The influence of the parameters such as embedding depth, particle size and grinding force on the stress distribution of abrasive particles is revealed, and the embedded depth is selected. Through the contrast analysis between single crystal and polycrystalline CBN abrasive soldering residual stress, and the grinding test of brazed polycrystalline CBN grinding wheel, the accuracy of the calculation results of brazing stress is verified. The effects of grinding amount on the self-sharpening behavior of polycrystalline CBN abrasive particles were discussed from the aspects of wear morphology and fractal dimension. It is found that compared with the single crystal CBN abrasive particles, the grinding properties of the polycrystalline CBN abrasive particles are more stable because they are more prone to micro-crushing.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG580.1

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