本文選題：內(nèi)冷式MQL　切入點(diǎn)：TC4鈦合金　出處：《江蘇科技大學(xué)》2017年碩士論文

【摘要】：近年來,人們在追求高效高速切削加工的同時,越來越重視切削過程的綠色化。微量潤滑(Minimum Quantity Lubrication,簡稱MQL)技術(shù)是通過高壓氣體對微量潤滑液進(jìn)行霧化后,噴射到切削區(qū)域?qū)ζ溥M(jìn)行冷卻潤滑的綠色加工方法。與傳統(tǒng)濕式切削技術(shù)相比,內(nèi)冷式MQL技術(shù)具有冷卻潤滑效果好、切削用量少、環(huán)境污染小等優(yōu)點(diǎn)。TC4鈦合金和AZ31B鎂合金屬于難加工材料,切削加工過程中冷卻條件對加工工件表面質(zhì)量、切削振動、切屑的形貌等影響較大。因此,開展TC4鈦合金和AZ31B鎂合金的內(nèi)冷式MQL銑削研究具有重要意義。本文在闡述國內(nèi)外內(nèi)冷式MQL研究概況的基礎(chǔ)上,系統(tǒng)開展內(nèi)冷式MQL銑削工藝基礎(chǔ)研究�；贛QL霧化原理及特征設(shè)計了一套內(nèi)冷式MQL系統(tǒng),依據(jù)Fluent軟件模擬內(nèi)冷式MQL中切削液流場分布及對工件的冷卻效果,確定銑刀內(nèi)冷孔噴射角度,設(shè)計制造出內(nèi)冷式銑刀;基于Abaqus軟件對TC4鈦合金和AZ31B鎂合金進(jìn)行內(nèi)冷式MQL銑削仿真,并在Mazak VTC-16A數(shù)控加工中心上對兩種材料進(jìn)行內(nèi)冷式MQL銑削試驗(yàn),探討內(nèi)冷式MQL銑削工藝特性,優(yōu)選最佳銑削參數(shù)。本文主要研究內(nèi)容如下:(1)系統(tǒng)闡述了流體力學(xué)及內(nèi)冷式MQL理論。通過Fluent仿真,研究了內(nèi)冷式MQL銑削過程中切削液的流場分布情況,重點(diǎn)分析了刀具內(nèi)冷孔入口壓力及流量對刀具噴嘴處流場分布情況及對工件的冷卻效果,設(shè)計制造出內(nèi)冷式銑刀。(2)利用Abaqus軟件對TC4鈦合金和AZ31B鎂合金進(jìn)行了銑削模擬仿真,在后處理中對銑削振動曲線進(jìn)行了收集,并繪制了銑削仿真后已加工表面結(jié)點(diǎn)位移—距離曲線。分析不同銑削組合參數(shù)對銑削振動和表面粗糙度的影響規(guī)律,為內(nèi)冷式MQL銑削工藝參數(shù)的選擇提供參考。(3)在Mazak VTC-16A數(shù)控機(jī)床上對TC4鈦合金和AZ31B鎂合金分別進(jìn)行內(nèi)冷式MQL銑削單因素和正交試驗(yàn),通過極差分析法分析噴霧參數(shù)和銑削參數(shù)對銑削振動、工件表面粗糙度、工件表面形貌和切屑形貌的影響。根據(jù)模擬仿真和內(nèi)冷式MQL銑削試驗(yàn)結(jié)果,基于信噪比分析法理論,優(yōu)選最佳銑削參數(shù),為實(shí)際內(nèi)冷式MQL銑削加工工藝參數(shù)的選擇提供參考。
[Abstract]:In recent years, people pay more and more attention to the greening of cutting process while pursuing high efficiency high speed cutting. Compared with the traditional wet cutting technology, the inner cooling MQL technology has better cooling and lubricating effect and less cutting parameters. The advantages of low environmental pollution. TC4 titanium alloy and AZ31B magnesium alloy are difficult to be machined. The cooling conditions have great influence on the surface quality, cutting vibration and chip morphology during machining. It is of great significance to study the internal cooling MQL milling of TC4 titanium alloy and AZ31B magnesium alloy. Based on the principle and characteristics of MQL atomization, a set of internal cooling MQL system is designed. The flow field distribution of cutting fluid and the cooling effect on workpiece are simulated by Fluent software. The internal cooling milling cutter was designed and manufactured by determining the injection angle of the cold hole in the milling cutter, the internal cooling MQL milling simulation of TC4 titanium alloy and AZ31B magnesium alloy was carried out based on Abaqus software, and the internal cooling MQL milling test of two kinds of materials was carried out on the Mazak VTC-16A NC machining center. In this paper, the characteristics of internal cooling MQL milling process and the optimum milling parameters are discussed. The main contents of this paper are as follows: 1) the hydrodynamics and the internal cooling MQL theory are expounded systematically. The flow field distribution of cutting fluid in the process of internal cooling MQL milling is studied. The effect of inlet pressure and flow rate on the flow field in the nozzle and the cooling effect on the workpiece are analyzed. The milling simulation of TC4 titanium alloy and AZ31B magnesium alloy was carried out by using Abaqus software, and the milling vibration curve was collected in post processing. The displacement-distance curves of machined surface nodes after milling simulation are plotted, and the influence of different milling parameters on milling vibration and surface roughness is analyzed. This paper provides a reference for the selection of process parameters of internal cooling MQL milling. The single factor and orthogonal test of TC4 titanium alloy and AZ31B magnesium alloy are carried out on Mazak VTC-16A NC machine tool, respectively. The effects of spray and milling parameters on milling vibration, workpiece surface roughness, workpiece surface morphology and chip morphology are analyzed by means of range analysis. The optimum milling parameters are selected to provide a reference for the selection of the processing parameters of the actual internal cooling MQL milling process.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG54

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