發(fā)布時(shí)間：2019-04-27 15:18

【摘要】：高溫合金具有優(yōu)良的耐高溫特性,是航空發(fā)動(dòng)機(jī)熱端部件的主要材料,亦是典型的難加工材料。高溫合金按制備工藝可分為變形高溫合金、鑄造高溫合金和粉末冶金高溫合金,其中,鑄造高溫合金在鑄造時(shí)不可避免地面臨縮孔縮松等缺陷,為保證鑄件的質(zhì)量,需合理使用冒口、冷鐵、補(bǔ)貼以實(shí)現(xiàn)順序凝固,補(bǔ)貼需要后續(xù)加工去除,且去除余量大,為加工帶來(lái)一定困難。本文針對(duì)鑄造高溫合金典型件承力機(jī)匣開(kāi)展車(chē)削、磨削加工技術(shù)研究,以期實(shí)現(xiàn)對(duì)機(jī)匣內(nèi)孔斷續(xù)及連續(xù)結(jié)構(gòu)的高效、低成本加工。主要內(nèi)容如下:(1)針對(duì)斷續(xù)和連續(xù)切削,研究涂層硬質(zhì)合金刀具內(nèi)圓車(chē)削時(shí)切削速度和進(jìn)給量對(duì)切削力、切削溫度的影響,為后續(xù)分析刀具磨損提供依據(jù)。(2)研究了兩種結(jié)構(gòu)下,切削參數(shù)對(duì)刀具壽命的影響規(guī)律,跟蹤觀(guān)察刀具的磨損形態(tài),結(jié)合切削力和切削溫度,借助掃描電鏡分析刀具的磨損形式和磨損機(jī)理。綜合分析切削參數(shù)對(duì)材料去除率和刀具耐用度期間材料去除量的影響,為實(shí)際生產(chǎn)中工藝參數(shù)的優(yōu)化提供參考。(3)在車(chē)床上搭建試驗(yàn)平臺(tái),實(shí)現(xiàn)磨削功能,針對(duì)斷續(xù)結(jié)構(gòu),嘗試以端面磨削和內(nèi)圓磨削的方式去除材料,以磨削比、材料去除率和砂輪耐用度期間的材料去除量為指標(biāo),研究工藝參數(shù)和砂輪特性對(duì)磨削性能的影響。
[Abstract]:Because of its excellent high temperature resistance, superalloy is the main material of hot-end parts of aero-engine, and it is also a typical difficult-to-process material. Superalloys can be divided into deformation superalloy, casting superalloy and powder metallurgy superalloy according to the preparation technology. In order to ensure the quality of castings, casting superalloys inevitably face defects such as shrinkage and shrinkage during casting. Reasonable use of riser, cold iron, subsidies to achieve sequential solidification, subsidies need to be removed by subsequent processing, and the removal of a large amount of surplus, for the processing of a certain difficulty. In this paper, turning and grinding technology of bearing casing for typical cast superalloy parts are studied in order to realize high efficiency and low cost machining of discontinuous and continuous structure of casing inner hole. The main contents are as follows: (1) for intermittent and continuous cutting, the effects of cutting speed and feed on cutting force and cutting temperature of coated cemented carbide cutting tools are studied. (2) the influence of cutting parameters on tool life under two kinds of structures is studied, and the wear morphology of tool is tracked and observed, combined with cutting force and cutting temperature, the cutting force and cutting temperature are combined with cutting force, cutting temperature, cutting force and cutting temperature. The wear form and wear mechanism of the tool were analyzed by scanning electron microscope (SEM). The influence of cutting parameters on material removal rate and material removal amount during the period of tool life is comprehensively analyzed in order to provide reference for the optimization of process parameters in practical production. (3) an experimental platform is built on a lathe to realize grinding function, aiming at intermittent structure. The effects of process parameters and grinding wheel characteristics on grinding performance were studied by means of end grinding and inner circle grinding. The grinding ratio, material removal rate and material removal amount during the duration of grinding wheel were taken as the indexes to study the effects of process parameters and grinding wheel characteristics on grinding performance.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TG51;TG580.6

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本文編號(hào)：2467085