抛光涂层硬质合金刀片加工钛合金的切削性能试验研究

发布时间：2018-06-13 10:22

本文选题：化学机械抛光(CMP) + 抛光涂层硬质合金刀片　；参考：《湘潭大学》2017年硕士论文

【摘要】：钛合金具有耐高温、耐腐蚀、耐冲击等优异的性能,在航空航天、汽车和船舶等领域得到广泛应用。钛合金同时具有导热系数小,高温化学活性高,弹性模量低,摩擦系数大等特性,易导致其加工性能差,属典型难加工材料。涂层硬质合金刀片具有高硬度、高耐磨性和良好的化学稳定性等优点,是目前加工钛合金的主流刀具。涂层硬质合金刀片基体主要采用磨削工艺加工,而磨削加工导致硬质合金刀片基体表面存在变质层、不规则磨粒划痕及残余应力等缺陷,这些缺陷都极大地降低了涂层硬质合金刀片的切削性能和使用寿命。鉴于化学机械抛光(CMP)具有加工表面质量好、无表面/亚表面损伤、表面缺陷密度低、材料去除率高、成本低等优点,因此,CMP是未来硬质合金刀片实现精密和超精密加工的重要方法,围绕化学机械抛光硬质合金刀片的切削性能研究具有重要的工程应用价值和理论指导意义。为此,本文以磨削加工的硬质合金YG8刀片为研究对象,首先对其表面进行化学机械抛光预处理,然后分别用PVD与CVD方法制备涂层硬质合金刀片,并通过车削钛合金的对比试验,探究切削参数对切削力和刀片耐用度的影响规律,借助测力仪、超景深显微镜、扫描电子显微镜和能谱仪等手段对抛光涂层硬质合金刀片的切削性能进行对比分析。具体工作开展如下:1)YG8硬质合金刀片基体前刀面抛光预处理。采用多工序工艺流程,分别对刀片进行了粗抛、半精抛和精抛处理,并采用超景深显微镜对硬质合金刀片表面形貌进行了观测。2)抛光涂层硬质合金刀片的制备。分别采用CVD、PVD涂层工艺对抛光和磨削的硬质合金刀片基体进行涂层,为后续的切削试验奠定基础。3)抛光涂层硬质合金刀片加工钛合金的切削力试验研究。采用正交试验法,通过车削TC4钛合金试验,揭示了不同切削参数对硬质合金刀片切削力的影响规律。4)抛光涂层硬质合金刀片加工钛合金的刀片耐用度试验研究。采用单因素试验法,通过车削TC4钛合金试验,并采用超景深显微镜、场发射扫描电子显微镜(SEM)及能谱分析仪(EDS)等设备,揭示了不同切削参数对硬质合金刀片耐用度的影响规律,并对刀片磨损机理进行了分析。综上,本文的研究为进一步提高涂层刀片的切削性能和优化刀片涂层工艺提供了科学依据。
[Abstract]:Titanium alloy has excellent properties such as high temperature resistance, corrosion resistance and impact resistance. It has been widely used in aerospace, automobile and ship fields. Titanium alloy has the characteristics of low thermal conductivity, high chemical activity at high temperature, low modulus of elasticity, large friction coefficient and so on. It is easy to lead to poor working properties, which is a typical hard working material. Coated carbide blade With the advantages of high hardness, high wear resistance and good chemical stability, it is the main cutting tool for the processing of titanium alloy at present. The matrix of coated carbide blade is mainly processed by grinding process, and the grinding process leads to the defects of the surface of the carbide blade matrix, irregular grinding and residual stress and so on. These defects are all very important. The earth reduces the cutting performance and service life of the coated carbide blade. Since chemical mechanical polishing (CMP) has the advantages of good surface quality, no surface / subsurface damage, low surface defect density, high material removal rate, low cost, and so on, CMP is an important method for the precision and ultra precision machining of hard alloy blades in the future. The research on the cutting performance of the cemented carbide blade around chemical mechanical polishing has important engineering application value and theoretical guiding significance. In this paper, the cemented carbide YG8 blade grinding was used as the research object. First, the chemical mechanical polishing was pretreated on the surface of the cemented carbide blade, and the coated carbide blade was prepared by PVD and CVD, respectively. Through the contrast test of turning titanium alloy, the influence of cutting parameters on the cutting force and the durability of the blade is explored. By means of dynamometer, ultra depth field microscope, scanning electron microscope and energy spectrometer, the cutting performance of the cemented carbide blade with polished coating is compared. The specific work is as follows: 1) the matrix of YG8 carbide blade The front blade surface polishing pretreatment. Using the multi process process flow, the blade was polished, semi finishing and finishing, and the surface morphology of the cemented carbide blade was observed with the ultra Sam microscope. The preparation of the hard alloy blade was made by.2). The cemented carbide blade was polished and grinded by CVD and PVD coating process respectively. The substrate is coated, laying the foundation for the subsequent cutting test.3) the experimental study on the cutting force of the titanium alloy with the polishing coating cemented carbide blade. By using the orthogonal test method, by turning the TC4 titanium alloy test, the influence of the cutting parameters on the cutting force of the cemented carbide inserts is revealed.4) the polishing coating hard alloy blade is used to process the titanium alloy. The blade durability test of gold is studied. By using single factor test method, the effect of different cutting parameters on the durability of carbide inserts is revealed by turning TC4 titanium alloy test and using ultra SDM, field emission scanning electron microscope (SEM) and energy spectrum analyzer (EDS). The wear mechanism of the blade is analyzed. In conclusion, this study provides a scientific basis for further improving the cutting performance of coated blade and optimizing blade coating process.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG711;TG506

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