共查询到19条相似文献,搜索用时 585 毫秒
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基于ANSYS/LS—DYNA软件的刀剪双面磨削过程数值分析 总被引:1,自引:0,他引:1
基于显式动力学方法,借助有限元分析软件ANSYS/LS—DYNA,模拟了磨削成形过程。数值模拟的结果揭示了磨削过程中金属的去除规律和应力变化情况。该结果为避免磨削过程中出现裂纹、卷口、过烧等现象提供参考,也为磨削加工中各项工艺参数的确定提供理论依据。 相似文献
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基于显式动力学方法,借助有限元分析软件ANSYS/LS—DYNA,模拟了磨削成形过程。数值模拟的结果揭示了磨削过程中金属的去除规律和应力变化情况。该结果为避免磨削过程中出现裂纹、卷口、过烧等现象提供参考,也为磨削加工中各项工艺参数的确定提供理论依据。 相似文献
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为解决MIR-01型雪茄卷制机茄衣茄套切刀磨损后无法快速磨削等问题,研制了一种离线式切刀磨刀机。磨刀机由砂轮高度调节机构、磨刀平台角度调节机构、砂轮传动机构三部分组成,通过精准调整砂轮高度和磨刀平台角度,使切刀与砂轮接触的角度保持一致;通过砂轮传动机构推动切刀完成刀刃的磨削过程,实现切刀分层定量磨削。取4把磨损严重的茄衣茄套切刀对磨刀机进行磨削测试,结果表明:经过两次磨削处理后,茄衣茄套切刀的使用时间分别增加43.35%和40.39%,提高了切刀磨削效率。该技术可为提升雪茄烟生产效率和产品品质提供支持。 相似文献
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对推台锯升降机构进行设计,利用ASDMS软件对升降机构进行动力学仿真验证该机构是否满足升降行程要求,利用ANSYS软件对升降机构连杆进行静力学分析,验证连杆是否满足安全要求。结果表明:本设计是可行的,成功的。 相似文献
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Francesco Cubadda Massimo Baldini Marina Carcea Luigi Alberto Pasqui Andrea Raggi Paolo Stacchini 《Food Additives & Contaminants》2001,18(9):778-787
Sample contamination as a consequence of abrasion of grinding tools during the homogenization of food materials to be analysed for trace elements was addressed. The possible release of 15 trace elements (Al, As, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, Se, Sn, V, Zn) from six different grinding and milling devices, operating either continuously or discontinuously, was evaluated. All the devices were commercially available and were representative of models usually employed in food and agricultural laboratories. Wheat grains belonging to one soft and one durum cultivar were used as test material. The determination of the analyte concentrations in subsamples submitted to the different preparation treatments was performed by quadrupole inductively coupled plasma mass spectrometry (Q-ICPMS). Accordingly, a suitable digestion method was developed and the ArC+ interference affecting Cr determination was evaluated and corrected. Statistical differences with respect to the control were detected for 10 elements (Al, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb) and in most cases contamination of the samples was traced back to the composition of the grinding equipment. None of the investigated devices was contamination-free with respect to all of the quantified elements. Abrasion of the grinding tools was higher with durum wheat than with soft wheat as a consequence of their different hardness. 相似文献
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X-ray technique is shown as a reliable procedure to measure residual stress in different kinds of sawblades. Measured values are presented. Finite element calculations give the margin of stress induced by process forces. Tests are carried out to measure the dependence between residual stress, natural frequencies and damping of the tool. The increase of damping is very small. Cutting experiments show the correlation between residual stress and produced work surface. 相似文献
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采用逆向工程技术重构了切牙和在咀嚼运动中起主要作用的上、下第一磨牙的三维模型,结合现代牙合理论与颞下颌关节运动理论构建了咀嚼运动的简化模型,将咀嚼运动分为三种模式:切割模式、杵压模式、研磨模式,仿真了咀嚼破碎食品的过程;基于食品物料的弹塑性本构模型,引入联合强度理论,分析了咀嚼运动规律对食品物料破坏程度的影响。匀速运动模式取5个不同的速率,结果表明在研磨模式下,较高的咀嚼速率对食物的破坏效果较好,其中咀嚼0.3 s时产生的剪切应力和密赛斯应力最大,分别为16.07 MPa和14.20 MPa;变速运动模式的仿真时间均取0.2 s,结果表明加速度变化对咀嚼效果的影响相对较弱,其中,匀加减运动能产生较大的剪切应力和密赛斯应力,分别为15.64 MPa和13.86 MPa,其更适合于研磨弹性和韧性食品。 相似文献
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竹材加工用的小型砂辊可设计成简易的结构形式,其中弹性夹紧环既是夹紧轴的安装支座,又是产生夹紧力的零件。由磨削力确定夹紧环所需的夹紧力,以此计算夹紧环的刚度和尺寸,并校核其强度和张紧砂布时的扳手力矩。在计算夹紧环的刚度时,将夹紧环简化成等截面圆环,应用了卡氏定理。在校核强度时,考虑了孔对截面上应力分布的影响及孔边应力集中系数。 相似文献
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