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采用正交试验法研究CBN直柄平底立铣刀高速铣削20CrMnTi淬硬钢时切削参数对已加工表面粗糙度的影响。通过极差分析方法研究了切削参数对表面粗糙度的影响程度,通过单因素试验法得到了切削参数对表面粗糙度的影响规律,建立了基于指数函数的切削参数与表面粗糙度的关系模型。利用预测模型得出的表面粗糙度与试验的结果进行误差分析,说明所建立的模型能比较准确地对表面粗糙度进行预测。试验结果表明:各因素的影响程度从大到小依次为铣削深度、每齿进给量和切削速度,表面粗糙度随每齿进给量和铣削深度的增大而增大,随切削速度的增大而减小。 相似文献
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利用单因素试验方法进行了密齿硬质合金涂层刀具铣削TC4钛合金试验,研究每齿进给量和切削速度对切削力、切削温度、加工表面粗糙度以及切屑形态的影响。结果表明:切削方向分力F_x、刀轴方向分力F_z随每齿进给量的增大而增大,进给方向分力F_y随每齿进给量的增加变化不大;切削速度小于75m/min时切削力随切削速度的增加下降较为明显;切削速度超过75m/min时切削力变化不大;切削温度受每齿进给量影响较大,且影响程度随进给量的增加而逐渐减小;随着每齿进给量f_z的增大,加工表面粗糙度值先减小后增大;在每齿进给量高于0.04mm/z时,密齿铣刀铣削TC4钛合金得到的切屑为螺卷状,且随每齿进给量的增加,切屑的曲率半径减小,随切削速度的增大,螺卷状切屑的螺距减小。 相似文献
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《新技术新工艺》2018,(12)
通过研究球墨铸铁高速平面铣削加工的工艺技术,分析了切削工艺参数对主轴功率占比、表面粗糙度及切屑形态的影响规律。结果表明:随着每齿进给量和切削深度的增加,主轴功率占比基本呈线性增大;随着切削速度的增大,主轴功率占比逐渐增大到某一值后又减小;表面粗糙度值随切削速度的增加线性减小,随每齿进给量和切削深度的增加变化不显著;随着切削速度的提高,典型切屑形态由卷曲状过渡到薄片状再到碎屑状,且切屑颜色逐渐呈现金黄色,切削深度和进给量对切屑形态的影响不明显。因此,对球墨铸铁高速平面铣削而言,在选择合理的切削深度和进给量的前提下,适当提高切削速度对主轴功率占比影响不大,却能在提高切削效率的同时,获得更好的加工质量。 相似文献
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采用正交试验法研究球头铣刀铣削加工牙科玻璃陶瓷时铣削参数对零件加工表面粗糙度的影响。设计了以铣削速度、每齿进给量、切削深度、径向切削宽度为主要因素的正交试验。通过极差分析方法研究了切削参数对表面粗糙度的影响规律,明确了主要影响因素。结果表明:各因素的影响程度从大到小依次为每齿进给量、径向切削宽度、铣削速度、切削深度。并建立了牙科玻璃陶瓷铣削加工表面的表面粗糙度预测模型。 相似文献
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本文在干切削与微量润滑(MQL)条件下对GW63K稀土镁合金开展铣削试验,分析不同铣削参数与冷却条件对GW63K镁合金铣削力和铣削温度的影响规律,并对已加工表面的形貌与表面质量进行研究。结果表明:在两种冷却条件下,增大切削速度和每齿进给量都会导致GW63K镁合金的铣削合力增加,且每齿进给量的影响更为显著;在MQL条件下,镁合金铣削合力较干切削有所上升;稀土镁合金的铣削温度亦随切削速度与每齿进给量的增大而上升;在干切削条件下,稀土镁合金的铣削温度较高。此外,每齿进给量对GW63K镁合金的已加工表面质量影响显著,而MQL有助于降低已加工表面粗糙度,提高表面质量。综上所述,采用MQL冷却方式,同时选取较低的每齿进给量与较高的切削速度,有助于提高GW63K镁合金的铣削性能。 相似文献
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基于回归分析方法的铣削表面粗糙度预测模型的建立 总被引:3,自引:1,他引:2
依据正交试验结果,利用回归分析方法建立了高速钢球头铣刀铣削铝合金工件时表面粗糙度的预测模型,并对该模型的回归方程和系数进行了显著性检验.该模型对预报表面粗糙度具有高度显著性:切削深度和走刀行距对表面粗糙度的影响显著,而主轴转速和每齿进给量对表面粗糙度影响不显著. 相似文献
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The aluminum alloy AlMn1Cu has been broadly applied for functional parts production because of its good properties. But few researches about the machining mechanism and the surface roughness were reported. The high-speed milling experiments are carried out in order to improve the machining quality and reveal the machining mechanism. The typical topography features of machined surface are observed by scan electron microscope(SEM). The results show that the milled surface topography is mainly characterized by the plastic shearing deformation surface and material piling zone. The material flows plastically along the end cutting edge of the flat-end milling tool and meanwhile is extruded by the end cutting edge, resulting in that materials partly adhere to the machined surface and form the material piling zone. As the depth of cut and the feed per tooth increase, the plastic flow of materials is strengthened and the machined surface becomes rougher. However, as the cutting speed increases, the plastic flow of materials is weakened and the milled surface becomes smoother. The cutting parameters (e.g. cutting speed, feed per tooth and depth of cut) influencing the surface roughness are analyzed. It can be concluded that the roughness of the machined surface formed by the end cutting edge is less than that by the cylindrical cutting edge when a cylindrical flat-end mill tool is used for milling. The proposed research provides the typical topography features of machined surface of the anti-rust aluminum alloy AlMn1Cu in high speed milling. 相似文献
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利用小型高速精密微铣削机床在6061铝合金表面加工微沟槽结构,对加工后的试件表面质量进行研究,以试件表面粗糙度Ra、Rz值为衡量指标,利用正交试验方法分析主轴转速、刀具悬伸量、进给量和轴向切深等因素对表面质量的影响。试验结果表明:试件表面粗糙度值整体变化趋势从大到小依次为中线区、顺铣区、逆铣区。主轴转速对表面粗糙度影响最显著,而其他因素随着表面质量要求的不同有所变化。综合考虑表面质量要求,最优组合为:刀具悬伸量为18mm,轴向切深为10μm,进给量为30mm/min,主轴转速为48 000r/min时,试件表面粗糙度最小,此时表面粗糙度Ra值为0.075μm,表面粗糙度Rz值为0.579μm。 相似文献
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为了提高和改善微沟槽表面质量,设计了高速微铣削实验,研究了微沟槽底面表面粗糙度和侧壁残留毛刺的变化规律。从理论角度引入了已加工表面的形成机理,建立了微观表面粗糙度理论模型,提出了刀具跳动对侧壁形貌变化影响的规律。利用三轴联动精密微细铣削机床加工微细直沟槽,并选取主轴转速、轴向切深、进给速度、刀具跳动量和材料组织结构为研究因素。采用多因素正交实验和极差分析法,对表面粗糙度值进行数值分析。铝合金,钢和钛合金三类微沟槽底面对应的最佳表面粗糙度值变化范围分别为1.073~1.481 μm,0.485~0.883 μm,0.235~0.267 μm;无刀具跳动钛合金微沟槽壁毛刺的最大高度为7.637 μm,而当刀具存在0.3 μm的径向综合跳动量时对应的微槽壁毛刺的最大高度为21.79 μm。铣削参数对表面粗糙度值的影响按从大到小依次为进给速度、主轴转速、轴向切深,且随着进给速度和轴向切深的增大,表面粗糙度值增大;随着主轴转速的增大,表面粗糙度值先减小后增大;在相同加工条件下,若微圆弧刀刃无磨损,微刀具的跳动量对微直沟槽侧壁表面质量有较大影响。同时,不同金属材料特性也是影响微沟槽表面质量的潜在因素。 相似文献
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Fengbiao Wang Yongqing Wang 《The International Journal of Advanced Manufacturing Technology》2018,99(9-12):2271-2281
This paper presents the first comprehensive investigation that aluminum honeycomb has inevitable machining defect in milling process, such as deformation, burr, and collapse. Ice fixation method was used to clamp workpieces, and inner-injection liquid nitrogen was employed for a series of cryogenic milling machining. In the machining process, the main machining parameters including in honeycomb orientation, milling width, cutting depth, cutting speed, and feed were executed experimental research. Meanwhile, the machining parameter optimization, range, and significant analysis were adopted to analyze the influence of machining parameters on the machining surface quality, as well as the optimal parameter combination and milling machining surface quality were predicted and verified. The results show that the ice fixation aluminum honeycomb method with cryogenic milling is much advanced than that of conventional ones, and many machining defects are effectively restrained. At the same time, the influence of machining parameters on machining qualities in descending order is cutting depth, cutting speed, honeycomb orientation, feed, and milling width. The minimum roughness value (Ra?=?0.356 μm) of the predicted machining surface is similar to the actual machining result (Ra?=?0.362 μm). It verifies the feasibility of the optimization method. Furthermore, it is proved that the ice fixation + liquid nitrogen cooling method has a positive effect on the high milling quality and implement efficiency for aluminum honeycomb and other difficult-to-machine materials. 相似文献