共查询到17条相似文献,搜索用时 93 毫秒
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GH4169高温合金的薄壁钻孔与厚壁钻孔相比有特殊性,运用ABAQUS软件进行钻削GH4169高温合金薄壁件的仿真,研究钻削加工过程中钻削参数和工件厚度对钻削力的影响规律及变化特征,分析应力的分布规律。结果表明:钻削初期,横刃的挤压和主切削刃切削长度的增加使钻削力和扭矩增大;稳定钻削阶段,横刃切出后,主切削刃切削长度不变切削直径增加,钻削力和扭矩稳定增加;钻削后期,副切削刃参与切削,主切削刃切削长度减小,轴向钻削力和扭矩减小,但副刃与孔壁的挤压摩擦,曲线波动较大;钻削速度、进给量及工件厚度的增加都会导致轴向钻削力和扭矩的增加;钻削时的最大应力分布在横刃和主切削刃与工件的接触部位。 相似文献
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通过对TC4钛板上钻削?0.1mm微孔的研究,建立了一种能够精确预测钻头所受钻削力的切削力模型。利用解析法分别将主切削刃和横刃离散成一系列斜角切削单元和直角切削单元;应用Deform软件,并充分考虑微细加工中特有的尺寸效应,模拟出每个单元所受的力;建立切削单元的局部坐标系与整个钻头的整体坐标系,将每个切削单元所受的力转化为整个钻头所受的力,进而求出整个钻头的轴向力与扭矩。通过多组工艺参数的仿真与实验,表明该切削力模型能够比较精确地测出微钻削过程中的钻削力。 相似文献
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GH4169高温合金薄壁钻孔与常规的高温合金厚壁钻孔相比有其特殊性,应用有限元分析软件对硬质合金钻头钻削镍基高温合金平板薄壁件的动态过程进行建模,总结钻削过程中钻削力的变化特点以及进给量和钻削速度对钻削力的影响。研究结果表明:当钻尖高度大于薄壁件厚度时,根据钻头与薄壁件的相对位置,可将钻削过程分为三个阶段,在不同阶段钻削力变化特点不同;轴向力和扭矩随着钻削速度的增加而增加,但轴向力增加幅度不大;轴向力和扭矩均随着进给量的增大而明显增大;进给量对钻削力和扭矩的影响较钻削速度明显。 相似文献
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依据枪钻的零前角的特殊结构,利用最简单的二元直角切削模型,逐步建立了平面型后刀面枪钻钻削灰铸铁的钻削力数学模型。 相似文献
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切削力的计算一般可用正交法及简易法。两者都是应用正交回归原理的试验和计算,所不同的是后者在试验数据的处理上采用角正围法,其试验范围点的分布是空间角正交图形,使试验次数减少,计算简化。作者借助于正交法中部分试验数据,应用简易法建立钻削轴向力和扭矩公式。 相似文献
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在模拟软件Dynaform中,将文献[3]中建立的拉延筋阻力计算模型作为等效拉延筋使用,模拟分析了表盘座某部件的成形.分析结果表明,在分析起皱、破裂等成形问题时,文中建立的拉延筋阻力计算模型比使用Dynaform自带等效拉延筋更接近使用真实拉延筋模拟的结果. 相似文献
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XU Linlin WANG Chengyong JIANG Min HE Huiyu SONG Yuexian CHEN Hanyuan SHEN Jingnan ZHANG Jiayong 《机械工程学报(英文版)》2014,(6):1240-1248
Many researches on drilling force and temperature have been done with the aim to reduce the labour intensiveness of surgery, avoid unnecessary damage and improve drilling quality. However, there has not been a systematic study of mid- and high-speed drilling under dry and physiological conditions(injection of saline). Furthermore, there is no consensus on optimal drilling parameters. To study these parameters under dry and physiological drilling conditions, pig humerus bones are drilled with medical twist drills operated using a wide range of drilling speeds and feed rates. Drilling force and temperature are measured using a YDZ-II01W dynamometer and a NEC TVS-500EX thermal infrared imager, respectively, to evaluate internal bone damage. To evaluate drilling quality, bone debris and hole morphology are observed by SEM(scanning electron microscopy). Changes in drilling force and temperature give similar results during drilling such that the value of each parameter peaks just before the drill penetrates through the osteon of the compact bone into the trabeculae of the spongy bone. Drilling temperatures under physiological conditions are much lower than those observed under dry conditions, while a larger drilling force occurs under physiological conditions than dry conditions. Drilling speed and feed rate have a significant influence on drilling force, temperature, bone debris and hole morphology. The investigation of the effect of drilling force and temperature on internal bone damage reveals that a drilling speed of 4500 r/min and a feed rate of 50 mm/min are recommended for bone drilling under physiological conditions. Drilling quality peaks under these optimal parameter conditions. This paper proposes the optimal drilling parameters under mid- and high-speed surgical drilling, considering internal bone damage and drilling quality, which can be looked as a reference for surgeons performing orthopedic operations. 相似文献
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