碳化硅陶瓷高效磨削钻孔及其质量控制

发布时间：2018-06-13 07:13

本文选题：碳化硅陶瓷 + 烧结金刚石钻头　；参考：《江苏科技大学》2017年硕士论文

【摘要】：碳化硅具有高硬度、耐高温、耐腐蚀、耐磨损等优点,被广泛运用在国防、航天、汽车等领域。由于加工条件及加工成本的制约,碳化硅陶瓷在装配时通常需要对其进行二次加工,如钻孔、开槽等。碳化硅陶瓷具有高硬度、低断裂韧性特点,属于典型的难加工材料,因此针对碳化硅陶瓷的加工特性,分析了碳化硅陶瓷的磨削去除机理、刀具的胎体及结构优化、刀具磨损以及陶瓷裂纹扩展规律等问题,对碳化硅陶瓷的孔加工技术进行系统的研究。论文的主要研究内容如下所示:(1)对碳化硅陶瓷的磨削加工机理进行了分析。通过理论分析计算与实验观察,研究了碳化硅陶瓷的磨削机理;通过扫描电镜的观察,分析了碳化硅陶瓷的材料去除方式及磨削表面特征。(2)对烧结金刚石钻头的性能进行优化。一方面对烧结金刚石钻头的胎体配方进行了优化;另一方面设计了正交试验,围绕加工效率对钻头的壁厚、粒度、浓度、水口数等结构参数进行了分析,获得了适用于碳化硅陶瓷性能优异的钻头结构。(3)建立了烧结金刚石钻头与陶瓷的磨损匹配关系模型,并通过试验的方式以钻头的加工效率和工作寿命为评价指标对模型进行了验证,使得建立的模型对碳化硅及其他陶瓷的加工具有指导意义。(4)针对碳化硅陶瓷加工过程中出现的裂纹及崩豁现象,对碳化硅陶瓷添加预应力装置,调节预应力值,以崩豁比和崩豁深度为质量评价指标获得了理想的预应力值范围。
[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.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ174.6

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