内冷式MQL铣削工艺基础研究

发布时间：2018-03-25 13:24

本文选题：内冷式MQL　切入点：TC4钛合金　出处：《江苏科技大学》2017年硕士论文

【摘要】：近年来,人们在追求高效高速切削加工的同时,越来越重视切削过程的绿色化。微量润滑(Minimum Quantity Lubrication,简称MQL)技术是通过高压气体对微量润滑液进行雾化后,喷射到切削区域对其进行冷却润滑的绿色加工方法。与传统湿式切削技术相比,内冷式MQL技术具有冷却润滑效果好、切削用量少、环境污染小等优点。TC4钛合金和AZ31B镁合金属于难加工材料,切削加工过程中冷却条件对加工工件表面质量、切削振动、切屑的形貌等影响较大。因此,开展TC4钛合金和AZ31B镁合金的内冷式MQL铣削研究具有重要意义。本文在阐述国内外内冷式MQL研究概况的基础上,系统开展内冷式MQL铣削工艺基础研究。基于MQL雾化原理及特征设计了一套内冷式MQL系统,依据Fluent软件模拟内冷式MQL中切削液流场分布及对工件的冷却效果,确定铣刀内冷孔喷射角度,设计制造出内冷式铣刀;基于Abaqus软件对TC4钛合金和AZ31B镁合金进行内冷式MQL铣削仿真,并在Mazak VTC-16A数控加工中心上对两种材料进行内冷式MQL铣削试验,探讨内冷式MQL铣削工艺特性,优选最佳铣削参数。本文主要研究内容如下:(1)系统阐述了流体力学及内冷式MQL理论。通过Fluent仿真,研究了内冷式MQL铣削过程中切削液的流场分布情况,重点分析了刀具内冷孔入口压力及流量对刀具喷嘴处流场分布情况及对工件的冷却效果,设计制造出内冷式铣刀。(2)利用Abaqus软件对TC4钛合金和AZ31B镁合金进行了铣削模拟仿真,在后处理中对铣削振动曲线进行了收集,并绘制了铣削仿真后已加工表面结点位移—距离曲线。分析不同铣削组合参数对铣削振动和表面粗糙度的影响规律,为内冷式MQL铣削工艺参数的选择提供参考。(3)在Mazak VTC-16A数控机床上对TC4钛合金和AZ31B镁合金分别进行内冷式MQL铣削单因素和正交试验,通过极差分析法分析喷雾参数和铣削参数对铣削振动、工件表面粗糙度、工件表面形貌和切屑形貌的影响。根据模拟仿真和内冷式MQL铣削试验结果,基于信噪比分析法理论,优选最佳铣削参数,为实际内冷式MQL铣削加工工艺参数的选择提供参考。
[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.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG54

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