共查询到19条相似文献,搜索用时 156 毫秒
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薄壁铝合金件的高速切削工艺研究 总被引:3,自引:0,他引:3
分析了薄壁铝合金零件的结构特点及加工工艺方案;研究了高速切削中减小其加工变形的切削参数优化策略。采用该措施可以有效地减小薄壁零件的加工变形,保证加工质量;明显地提高生产效率,缩短飞机的制造周期。 相似文献
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针对某薄壁铝合金箱体零件因侧壁过薄易装夹变形与铣削变形导致精度降低的问题,设计了专用夹具并进行有限元分析,使装夹变形量从0.015 7 mm减小到0.005 98 mm,减小了61.9%;通过Design-Expert软件建立参数样本并生成目标函数,采用人工蜂群算法对目标函数进行优化,获取了一组铣削合力最小的铣削参数组合并输出预测值,利用ABAQUS软件对所输出参数进行仿真模拟,使铝合金薄壁箱体的铣削合力减小了35.3%;最后进行了实际加工实验,对零件尺寸进行测量,均符合公差范围。研究表明该方法对薄壁铝合金箱体零件提高加工尺寸精度有重要意义。 相似文献
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针对航空航天和军工产品制造中常用铝合金薄板加工各类基板、盖板、底板等零件时材料去除率高且加工变形严重,需要在铣削加工过程中保证薄板零件尺寸精度和形状精度、减少薄板铣削后变形的问题,制定了数控加工工艺方案。分别通过对制造过程中零件的装夹方式、铣削方法、去应力方法等采取措施,以减少铝合金薄板加工产生的铣削应力、装夹应力和材料弹性变形应力等影响零件的变形因素,并经过多种加工工艺的对比、筛选和改进,解决了铝合金薄板零件加工变形问题,形成了一套满足铝合金薄板加工整体系统化的装夹、定位和铣削的典型数控加工工艺方案。 相似文献
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《机械工程与自动化》2017,(5)
针对铝合金壁板端面铣削中的变形误差,在高速加工中心上采用正交试验的方法,对预拉伸铝合金7075进行了端铣试验,研究了切削用量中切削速度、进给速度、切削深度分别对加工误差的影响。该试验是一个3因素3水平单指标的试验,采用极差分析法对结果进行了详细分析。通过试验,得到了三要素对加工误差的影响规律,为合理选用切削参数、减少加工变形、提高零件质量提供了可靠依据。 相似文献
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NOMEX蜂窝芯高速铣削加工工艺的优化 总被引:1,自引:0,他引:1
为了解决NOMEX蜂窝芯高速铣削加工过程中固持可靠性差和加工效率低以及加工表面质量差的问题,提出一种新的基于强磁场和摩擦学原理的蜂窝芯高速加工固持方法。该方法利用灌入蜂窝孔中的铁粉自重以及强磁场平台对铁粉产生的吸引力,在铁粉与蜂窝孔侧壁之间以及蜂窝、铁粉与固持平台之间产生摩擦力,实现对蜂窝底部的全约束和固定。建立了NOMEX蜂窝芯高速铣削加工的铣削力模型,进行了以铣削力最小为目标的铣削参数的优化。通过铣削参数的优化,保证了加工过程中蜂窝的固持稳定性,同时保证了蜂窝加工效率和加工质量。 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
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Moncef Hbaieb Radhouane Othmani Wassila Bouzid 《The International Journal of Advanced Manufacturing Technology》2011,53(1-4):113-120
Numerical control milling (NCM) at high speed is the most used machining process in the manufacture of molds because it offers high productivity and workpiece surface quality. The aim of this work is to establish a methodology to evaluate the rough machining time, during high speed milling. In pocket machining, a 2.5D milling has been considered. The proposed approach considers the roughing cutting time as the ratio of the pocket volume by the removed material rate. The pocket is divided into volumes distributed according to the real radial depth. Since the radial depth varies during machining, the removed material rate is not constant. In this paper, an experimental study is carried out to validate models of machining time calculation. The obtained results show that the proposed method offers fast and easy calculation of the machining time of pocket roughing. 相似文献
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自由曲面数控加工刀具的研究 总被引:5,自引:0,他引:5
对自由曲面数控加工中的刀具进行了较深入的研究。从刀具有效半径和切削速度的角度,对平头立铣刀在五坐标自由曲面加工中的加工效率与切削性能进行了分析。提出了球头刀和平头刀的刀位计算方法,并对叶片曲面的刀具轨迹进行了仿真模拟。 相似文献
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针对使用传统方法加工滑枕铣床升降台存在质量差、效率低的问题,将高速切削加工技术引入滑枕铣床升降台的加工过程中,并对滑枕铣床升降台加工工艺进行了改进.高速切削加工切削系统的工作频率远高于机床的低阶固有频率,振动较小,大大降低了加工表面粗糙度,提高了加工质量.基于高速切削加工转速高和切削力小的特点,取消滑枕铣床升降台半精加工工序,提高了加工效率. 相似文献