钎焊层关键参数对镐形截齿力学性能的影响研究

发布时间：2018-10-20 08:31

【摘要】：镐形截齿是煤矿采掘机械应用最广泛的用于破碎煤岩的刀具。由于井下工况的复杂性,极易导致截齿失效,严重影响着采掘机械的生产效率。硬质合金头脱落是矿用镐形截齿失效的主要表现形式之一,脱落的主要原因与钎焊层的钎焊质量有关。针对这一突出问题,本论文采用物理实验与有限元数值模拟相结合的方法,研究了镐形截齿钎焊层关键参数对截齿力学性能的影响规律。本论文主要研究内容包括:(1)研究分析了镐形截齿失效的形式、原因及钎焊工艺特点,得出以硬质合金头脱落为表征的截齿早期失效的主要原因是钎焊层钎焊质量差造成的;(2)利用维氏硬度实验和数值模拟相结合的方法,间接得出了截齿表面各区域材料所对应的屈服强度值,建立了一种由实验硬度值HV获取截齿焊接接头等不易测量区域力学性能参数的方法;(3)建立了 T92.03AC型镐形截齿有限元模型,并模拟分析了焊接接头处钎焊层屈服强度对截齿整体力学性能的影响规律,得出钎料选择建议;(4)模拟并分析了钎焊层厚度对截齿整体力学性能的影响规律,并得出合理的钎焊层厚度范围。本文的研究结论对截齿生产制造工艺的改进具有一定的参考意义。
[Abstract]:Pick-shaped cutter is the most widely used cutting tool for crushing coal and rock in coal mining machinery. Because of the complexity of underground working conditions, it is easy to lead to tooth cutting failure, which seriously affects the production efficiency of mining machinery. The head shedding of cemented carbide is one of the main forms of failure of mining pick-shaped teeth, and the main reason is related to the soldering quality of the brazing layer. In order to solve this problem, the influence of the key parameters of the brazing layer on the mechanical properties of the cutter is studied by combining the physical experiment with the finite element numerical simulation in this paper. The main contents of this thesis are as follows: (1) the form, cause and characteristics of brazing process are analyzed and analyzed. It is concluded that the main reason for the early failure of cutting teeth characterized by the loss of cemented carbide head is the poor brazing quality of brazing layer. (2) the method of combining Vickers hardness experiment with numerical simulation is used. The yield strength values corresponding to the materials in each area of the tooth cutting surface are obtained indirectly, and a method of obtaining the mechanical properties parameters of the welded joint of the truncated teeth from the experimental hardness value HV is established. (3) the finite element model of the T92.03AC pick-shaped cutter is established. The influence of the yield strength of the brazed layer on the mechanical properties of the cutter is simulated, and the selection suggestion of solder is obtained. (4) the influence of the thickness of the brazing layer on the mechanical properties of the cutter is simulated and analyzed. The reasonable thickness range of brazing layer is obtained. The conclusion of this paper has a certain reference significance for the improvement of manufacturing process of gear cutting.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG454;TD421

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