本文關鍵詞： 高壓冷卻 切削力 表面粗糙度 切屑 刀具磨損　出處：《哈爾濱理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：近年來,像鈦合金和鎳基合金這樣的難加工材料作為結構材料廣泛應用于航空航天領域。但是由于這類材料的難加工特性導致其加工過程中出現刀具磨損,切削速度低,長卷屑纏刀、生產效率低等問題。為了更好的滿足難加工材料的高精度、高效率及低成本的生產要求,MQL潤滑技術、過熱水蒸氣等切削技術雖然被提出,但是在加工過程中存在一定的局限性,因此高壓冷卻潤滑技術作為一種新型的冷卻潤滑方式成為難加工材料高效切削研究的重點。通過對切削液高壓過程中的射流結構、速度及流量進行理論及仿真分析,探討高壓冷卻刀柄的噴嘴與切削刃與之間的位置關系;基于毛細管理論分析了高壓射流狀態(tài)下切削液的滲透特性;利用邊界潤滑模型對前刀面的摩擦力等分析了冷卻液高壓射流作用下的潤滑特性;利用對流換熱系數和熱流密度的理論模型及Matlab仿真分析了高壓射流過程中的冷卻效果。通過難加工材料GH4169和TC11冷卻條件對比試驗,分析冷卻方式對切削力和已加工表面的表面粗糙度的影響;通過高壓冷卻條件下射流壓力變化試驗研究,分析高壓射流壓力對切削力的影響。針對高壓冷卻切削試驗對切屑的形態(tài)進行分析,對鋸齒形切屑通過鋸齒形切屑的鋸齒化程度和帶切角的進行表征,并對射流壓力變化試驗中的切屑進行分析,得到射流壓力鋸齒形切削的影響規(guī)律。針對高壓冷切削對刀具磨損量及磨損形貌進行分析,并分析冷卻液射流壓力對刀具的后刀面磨損量VB值的影響,分析了冷卻方式對GH4169和TC11切削過程中對刀具溝槽磨損的影響;對高壓冷卻技術下的刀具磨損機理進行研究,以期為高壓冷卻技術的的推廣提供一定的理論支持。
[Abstract]:In recent years, such as titanium and nickel base alloy hard processing material as a structural material widely used in the aerospace field. But because of the difficulty in processing characteristics of this kind of materials which appeared in the process of machining tool wear, low cutting speed, long chip winding knife, problems of low production efficiency. In order to better meet the needs of high precision hard processing materials, production requirements of high efficiency and low cost, MQL lubrication technology, water vapor and other cutting technology while being put forward, but there are some limitations in the machining process, so the high pressure cooling lubrication technology as a new type of cooling and lubricating material processing has become the focus of research of high efficiency cutting difficult. Based on the jet the structure of high pressure in the process of cutting fluid, theoretical analysis and simulation speed and flow of high pressure cooling blade nozzle and the cutting edge and the position relationship between the base on the capillary; The theoretical analysis of the permeability characteristics of cutting fluid state of high pressure jet; the rake face friction analysis of the lubrication characteristics of the coolant jet under the action of the boundary lubrication model; theoretical model and Matlab simulation using the convection heat transfer coefficient and the heat flux of the cooling effect of high pressure jet process. Through the difficult to machine materials GH4169 TC11 and cooling conditions contrast test, analysis of cooling mode on cutting force and surface roughness of the machined surface; through the experimental study of jet pressure change under the condition of high pressure cooling, analysis of the impact of high pressure jet pressure on the cutting force. According to the analysis of morphology of high pressure cooling experiment of cutting chip, serrated degree of sawtooth cutting through the serrated chip and cutting angle of characterization, and the chip testing of jet pressure changes in the analysis of jet pressure serrated Effects of cutting. In the high-pressure cold cutting and wear morphology analysis of tool wear, and after the analysis of the coolant jet pressure on the knife tool wear influence value VB, analyzes the cooling method on GH4169 and TC11 in the process of cutting tool on the effect of groove wear; researches on the tool wear mechanism of high pressure cooling technology, in order to provide theoretical support for the popularization of high pressure cooling technology.

【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG51

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本文編號：1546357