【摘要】：鈦合金憑借其優(yōu)良的機(jī)械力學(xué)性能廣泛應(yīng)用于航空航天、機(jī)械、醫(yī)療等領(lǐng)域,特別是航空發(fā)動(dòng)機(jī)壓氣機(jī)盤和渦輪盤等零部件。但鈦合金作為典型的難加工材料,其切削性能很差,切削溫度高、化學(xué)活性大、冷硬現(xiàn)象嚴(yán)重以及刀具易磨損,嚴(yán)重影響零件的已加工表面質(zhì)量,降低了航空零部件的服役性能及使用壽命。為了解決以上問(wèn)題,本文主要針對(duì)鈦合金TC11進(jìn)行了車削表面質(zhì)量及刀具磨損研究,分別對(duì)表面粗糙度、加工硬化、殘余應(yīng)力以及表層微觀組織進(jìn)行了重點(diǎn)分析,為切削參數(shù)和刀具優(yōu)化提供一定的理論基礎(chǔ),從而實(shí)現(xiàn)鈦合金TC11高質(zhì)高效加工。具體研究?jī)?nèi)容如下:設(shè)計(jì)單因素鈦合金車削試驗(yàn),采用涂層與非涂層硬質(zhì)合金刀具在常規(guī)冷卻和高壓冷卻兩種條件下切削加工,研究切削速度,進(jìn)給量以及冷卻條件對(duì)刀具磨損的影響規(guī)律,對(duì)比分析刀具磨損形式及形成機(jī)理。采用白光干涉儀對(duì)表面粗糙度進(jìn)行檢測(cè)分析,研究不同冷卻條件下,切削參數(shù)切削速度、進(jìn)給量以及不同時(shí)間刀具磨損對(duì)表面粗糙度的影響規(guī)律,對(duì)比非涂層與涂層刀具表面粗糙度隨切削參數(shù)的變化情況。通過(guò)SEM掃描觀察已加工表面,分析切削表面缺陷類型及形成原因�？紤]刀具磨損進(jìn)行已加工表面加工硬化研究,詳細(xì)分析加工硬化產(chǎn)生原因及其影響因素。采用涂層硬質(zhì)合金刀具切削,研究切削速度和進(jìn)給量對(duì)表面加工硬化程度及硬化層深度范圍的影響規(guī)律,對(duì)比不同冷卻條件下切削速度對(duì)加工硬化的影響規(guī)律。對(duì)已加工表面殘余應(yīng)力及表層微觀組織變化情況進(jìn)行研究。采用X射線衍射儀檢測(cè)已加工表面殘余應(yīng)力性質(zhì)及大小,詳細(xì)分析不同性質(zhì)殘余應(yīng)力產(chǎn)生機(jī)理,對(duì)比涂層與非涂層刀具對(duì)表面殘余應(yīng)力的影響,研究不同冷卻條件下,切削參數(shù)及刀具磨損對(duì)表面殘余應(yīng)力的影響規(guī)律。采用SEM掃描電子顯微鏡觀察表層塑性變形程度和塑性變形層深度,對(duì)比分析切削參數(shù)、冷卻條件以及刀具磨損對(duì)其影響規(guī)律,觀察分析表層晶粒拉伸、扭曲變化規(guī)律。
[Abstract]:Titanium alloy is widely used in aerospace, machinery, medical and other fields, especially in compressor disk and turbine disk of aero-engine, because of its excellent mechanical properties. In order to solve the above problems, the surface quality and tool wear of titanium alloy TC11 are studied in this paper. The surface roughness, work hardening, residual stress and surface microstructure are analyzed in detail. The specific research contents are as follows: Designing single factor titanium alloy turning test, using coated and uncoated cemented carbide tools cutting under the conditions of conventional cooling and high pressure cooling, studying cutting speed, feed rate and cooling. The surface roughness was measured and analyzed by white light interferometer. The influence of cutting parameters, cutting speed, feed rate and tool wear at different time on surface roughness under different cooling conditions was studied. The surface roughness changes with cutting parameters. The machined surface was observed by SEM scanning, and the types and causes of surface defects were analyzed. The machined surface was hardened by considering tool wear. The causes and influencing factors of machined surface hardening were analyzed in detail. The influence of degree and feed rate on the degree of surface hardening and the depth range of hardened layer was studied. The influence of cutting speed on the degree of surface hardening under different cooling conditions was compared. The mechanism of residual stress in different properties is analyzed in detail, and the influence of coating and uncoated cutting tools on the surface residual stress is compared. The influence of cutting parameters and tool wear on the surface residual stress under different cooling conditions is studied. The effects of cutting parameters, cooling conditions and tool wear on the cutting parameters were observed and analyzed.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG51

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