含硼金刚石钎焊工具制作及性能评价研究

发布时间：2018-03-04 07:09

本文选题：含硼金刚石　切入点：钎焊机理　出处：《南京航空航天大学》2016年硕士论文　论文类型：学位论文

【摘要】：与普通金刚石相比,含硼金刚石耐磨性好,化学惰性高,且与铁族金属亲和力较小,可一定程度缓解磨削弧区化学反应;此外,高温钎焊金刚石工具磨粒结合强度高,容屑空间较大,可有效缓解切屑堵塞黏附砂轮等现象。因此,本文在已有钎焊工艺研究基础上,采用Ag-Cu-Ti合金粉末研制含硼金刚石及普通金刚石钎焊砂轮,对钛合金工件材料进行磨削试验并进行仿真分析,研究其磨削力、磨削力比及耐磨性特征等,以期对含硼金刚石钎焊工具的研制发展及性能评价等方面提供理论方向性指导。本文主要研究内容如下:(1)观察分析钎焊含硼金刚石界面微观结构、元素迁移分布特征、表面生成物物相等,并结合热力学及动力学理论探究其界面反应机理。(2)分别对金刚石在原始、真空空烧、真空钎焊状态下静压强度和冲击强度进行测试,对比分析高温及钎焊过程对不同金刚石磨粒强度影响。(3)研制并列双轨单层钎焊金刚石砂轮,进行钛合金磨削试验,分析其磨削力及磨削力比变化规律;并采用ABAQUS有限元软件对磨粒承受载荷条件下应力分布进行仿真分析。(4)在不同材料累积去除量下,探究普通金刚石与含硼金刚石磨粒磨损变化特征,并建立磨粒磨损量与材料累积去除量关系,得到耐磨性曲线,同时对磨耗比及比磨削能进行计算分析,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.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG43

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