本文選題：化學(xué)機械拋光(CMP) + 拋光涂層硬質(zhì)合金刀片　； 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：鈦合金具有耐高溫、耐腐蝕、耐沖擊等優(yōu)異的性能,在航空航天、汽車和船舶等領(lǐng)域得到廣泛應(yīng)用。鈦合金同時具有導(dǎo)熱系數(shù)小,高溫化學(xué)活性高,彈性模量低,摩擦系數(shù)大等特性,易導(dǎo)致其加工性能差,屬典型難加工材料。涂層硬質(zhì)合金刀片具有高硬度、高耐磨性和良好的化學(xué)穩(wěn)定性等優(yōu)點,是目前加工鈦合金的主流刀具。涂層硬質(zhì)合金刀片基體主要采用磨削工藝加工,而磨削加工導(dǎo)致硬質(zhì)合金刀片基體表面存在變質(zhì)層、不規(guī)則磨粒劃痕及殘余應(yīng)力等缺陷,這些缺陷都極大地降低了涂層硬質(zhì)合金刀片的切削性能和使用壽命。鑒于化學(xué)機械拋光(CMP)具有加工表面質(zhì)量好、無表面/亞表面損傷、表面缺陷密度低、材料去除率高、成本低等優(yōu)點,因此,CMP是未來硬質(zhì)合金刀片實現(xiàn)精密和超精密加工的重要方法,圍繞化學(xué)機械拋光硬質(zhì)合金刀片的切削性能研究具有重要的工程應(yīng)用價值和理論指導(dǎo)意義。為此,本文以磨削加工的硬質(zhì)合金YG8刀片為研究對象,首先對其表面進行化學(xué)機械拋光預(yù)處理,然后分別用PVD與CVD方法制備涂層硬質(zhì)合金刀片,并通過車削鈦合金的對比試驗,探究切削參數(shù)對切削力和刀片耐用度的影響規(guī)律,借助測力儀、超景深顯微鏡、掃描電子顯微鏡和能譜儀等手段對拋光涂層硬質(zhì)合金刀片的切削性能進行對比分析。具體工作開展如下:1)YG8硬質(zhì)合金刀片基體前刀面拋光預(yù)處理。采用多工序工藝流程,分別對刀片進行了粗拋、半精拋和精拋處理,并采用超景深顯微鏡對硬質(zhì)合金刀片表面形貌進行了觀測。2)拋光涂層硬質(zhì)合金刀片的制備。分別采用CVD、PVD涂層工藝對拋光和磨削的硬質(zhì)合金刀片基體進行涂層,為后續(xù)的切削試驗奠定基礎(chǔ)。3)拋光涂層硬質(zhì)合金刀片加工鈦合金的切削力試驗研究。采用正交試驗法,通過車削TC4鈦合金試驗,揭示了不同切削參數(shù)對硬質(zhì)合金刀片切削力的影響規(guī)律。4)拋光涂層硬質(zhì)合金刀片加工鈦合金的刀片耐用度試驗研究。采用單因素試驗法,通過車削TC4鈦合金試驗,并采用超景深顯微鏡、場發(fā)射掃描電子顯微鏡(SEM)及能譜分析儀(EDS)等設(shè)備,揭示了不同切削參數(shù)對硬質(zhì)合金刀片耐用度的影響規(guī)律,并對刀片磨損機理進行了分析。綜上,本文的研究為進一步提高涂層刀片的切削性能和優(yōu)化刀片涂層工藝提供了科學(xué)依據(jù)。
[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.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG711;TG506

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