高压冷却润滑条件下难加工材料车削试验研究

发布时间：2018-02-28 07:33

本文关键词： 高压冷却切削力表面粗糙度切屑刀具磨损　出处：《哈尔滨理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,像钛合金和镍基合金这样的难加工材料作为结构材料广泛应用于航空航天领域。但是由于这类材料的难加工特性导致其加工过程中出现刀具磨损,切削速度低,长卷屑缠刀、生产效率低等问题。为了更好的满足难加工材料的高精度、高效率及低成本的生产要求,MQL润滑技术、过热水蒸气等切削技术虽然被提出,但是在加工过程中存在一定的局限性,因此高压冷却润滑技术作为一种新型的冷却润滑方式成为难加工材料高效切削研究的重点。通过对切削液高压过程中的射流结构、速度及流量进行理论及仿真分析,探讨高压冷却刀柄的喷嘴与切削刃与之间的位置关系;基于毛细管理论分析了高压射流状态下切削液的渗透特性;利用边界润滑模型对前刀面的摩擦力等分析了冷却液高压射流作用下的润滑特性;利用对流换热系数和热流密度的理论模型及Matlab仿真分析了高压射流过程中的冷却效果。通过难加工材料GH4169和TC11冷却条件对比试验,分析冷却方式对切削力和已加工表面的表面粗糙度的影响;通过高压冷却条件下射流压力变化试验研究,分析高压射流压力对切削力的影响。针对高压冷却切削试验对切屑的形态进行分析,对锯齿形切屑通过锯齿形切屑的锯齿化程度和带切角的进行表征,并对射流压力变化试验中的切屑进行分析,得到射流压力锯齿形切削的影响规律。针对高压冷切削对刀具磨损量及磨损形貌进行分析,并分析冷却液射流压力对刀具的后刀面磨损量VB值的影响,分析了冷却方式对GH4169和TC11切削过程中对刀具沟槽磨损的影响;对高压冷却技术下的刀具磨损机理进行研究,以期为高压冷却技术的的推广提供一定的理论支持。
[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.

【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG51

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