本文選題：含硼金剛石　切入點(diǎn)：釬焊機(jī)理　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】：與普通金剛石相比,含硼金剛石耐磨性好,化學(xué)惰性高,且與鐵族金屬親和力較小,可一定程度緩解磨削弧區(qū)化學(xué)反應(yīng);此外,高溫釬焊金剛石工具磨粒結(jié)合強(qiáng)度高,容屑空間較大,可有效緩解切屑堵塞黏附砂輪等現(xiàn)象。因此,本文在已有釬焊工藝研究基礎(chǔ)上,采用Ag-Cu-Ti合金粉末研制含硼金剛石及普通金剛石釬焊砂輪,對(duì)鈦合金工件材料進(jìn)行磨削試驗(yàn)并進(jìn)行仿真分析,研究其磨削力、磨削力比及耐磨性特征等,以期對(duì)含硼金剛石釬焊工具的研制發(fā)展及性能評(píng)價(jià)等方面提供理論方向性指導(dǎo)。本文主要研究內(nèi)容如下:(1)觀察分析釬焊含硼金剛石界面微觀結(jié)構(gòu)、元素遷移分布特征、表面生成物物相等,并結(jié)合熱力學(xué)及動(dòng)力學(xué)理論探究其界面反應(yīng)機(jī)理。(2)分別對(duì)金剛石在原始、真空空燒、真空釬焊狀態(tài)下靜壓強(qiáng)度和沖擊強(qiáng)度進(jìn)行測試,對(duì)比分析高溫及釬焊過程對(duì)不同金剛石磨粒強(qiáng)度影響。(3)研制并列雙軌單層釬焊金剛石砂輪,進(jìn)行鈦合金磨削試驗(yàn),分析其磨削力及磨削力比變化規(guī)律;并采用ABAQUS有限元軟件對(duì)磨粒承受載荷條件下應(yīng)力分布進(jìn)行仿真分析。(4)在不同材料累積去除量下,探究普通金剛石與含硼金剛石磨粒磨損變化特征,并建立磨粒磨損量與材料累積去除量關(guān)系,得到耐磨性曲線,同時(shí)對(duì)磨耗比及比磨削能進(jìn)行計(jì)算分析,探究其磨削性能。
[Abstract]:Compared with ordinary diamond, boron containing diamond has better wear resistance, higher chemical inertia and less affinity with iron group metal, which can alleviate the chemical reaction in grinding arc region to some extent. In addition, the high temperature brazing diamond tool has high abrasive strength. The chip-holding space is large, which can effectively alleviate the phenomenon of chip clogging and adhesion grinding wheel. Therefore, based on the existing brazing technology, the boron-bearing diamond and ordinary diamond brazing grinding wheel are developed by using Ag-Cu-Ti alloy powder. The grinding force, grinding force ratio and wear resistance of titanium alloy workpiece are studied by grinding test and simulation analysis. In order to provide theoretical direction for the research and development and performance evaluation of boron-containing diamond brazing tools, the main contents of this paper are as follows: 1) observing and analyzing the microstructure and element migration distribution of brazed diamond containing boron. The surface products are equal, and the interfacial reaction mechanism of diamond is studied by thermodynamics and kinetic theory.) the static compressive strength and impact strength of diamond under the condition of original, vacuum vacuum sintering and vacuum brazing are measured, respectively. The effect of high temperature and brazing process on the strength of different diamond abrasive particles is analyzed. The parallel double-track single-layer brazed diamond grinding wheel is developed. The grinding test of titanium alloy is carried out and the law of grinding force and grinding force ratio is analyzed. ABAQUS finite element software was used to simulate and analyze the stress distribution of abrasive particles under load. (4) under different material accumulative removal amounts, the wear characteristics of ordinary diamond and boron-bearing diamond abrasive particles were investigated. The wear resistance curve was obtained by establishing the relationship between abrasive wear and material cumulative removal, and the wear ratio and specific grinding energy were calculated and analyzed to explore its grinding performance.
【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)】：TG43

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