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双曲率薄壁铝合金盒形件是一种常见的飞机内蒙皮类钣金零件。针对目标零件采用传统落压成形过程中存在的生产效率低、表面质量差的问题,采用充液成形工艺成形该类零件,其目的在于提高零件表面质量并降低模具成本。通过数值模拟软件,建立了双曲率薄壁铝合金盒形件主动式充液成形的有限元模型,通过分析液室压力、压边力加载路径、润滑条件等因素对零件成形性的影响,对零件成形的起皱和破裂情况进行分析,优化确定最佳的工艺参数。并依据优化后的工艺参数进行了现场实验,利用数值模拟技术分析和解决了现场实验零件的质量问题,成功制造出合格零件,进一步验证了工艺方案及工艺参数的可行性。 相似文献
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针对某汽车防振螺母性能差、凹槽底部容易断裂且制造成本高的问题,拟对传统制造工艺进行改进,提出了一种近净成形加工技术,并联合有限元模拟技术进行了辅助研究。通过压缩试验获得了35CrMo合金钢的室温力学性能,以此建立了准确的仿真材料模型;根据防振螺母的结构特征和使用特点,简单介绍了成形思路,制定了新的成形方案,并完成了冷镦阶段的成形模具设计;通过Deform-3D对防振螺母的连续冷镦过程进行了模拟,综合分析了零件成形情况、载荷-行程曲线、等效应力分布等,确保了工艺过程和模具结构设计的合理性,有效地指导了最终的工艺试验,降低了生产风险。试验结果表明:采用新工艺生产的防振螺母性能稳定、凹槽质量好,有效地解决了企业当前面临的难题。 相似文献
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通过对零件结构特点进行分析,确定零件的冲压工艺方案,通过Autoform R6.0软件数值模拟优化与经验分析相结合,提供了合理的拉深工艺造型和板料尺寸,结合压力机参数,分析零件的配合面特点及零件安装质量要求,设计与制造了成形该零件的拉深模和翻边模。通过生产实践验证了该零件冲压工艺与模具结构的合理性,对同类零件的工艺制订、模具设计与制造有较好的参考价值。 相似文献
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应用Moldflow软件对金属-橡胶复合制品V形橡胶弹簧注压成型的填充过程进行了分析,优化了浇口尺寸,保证了熔料填充的平衡性,结合试验分析了零件的收缩规律和填充规律,还介绍了零件的模具结构设计及工作过程。实践证明:通过导滑槽实现模具侧开式的开模方式使零件出模方便,解决了出模难的问题,对同类结构的零件模具设计和硫化工艺具有参考作用。 相似文献
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对抽油烟机面板传统冲压成形工艺进行改进,优化其成形工艺,合并相关冲压工序,介绍了改进后的弯曲模结构、工作过程和模具主要零件的设计与制造。减少零件成形的工序,节约了人力、物力,降低生产成本。 相似文献
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以拉把型腔模具为例,着重介绍了CimatronE软件在模具制造中的数控加工工艺规划、刀路合理选择和加工参数设置以及难加工部位的电极设计等关键技术,给出了模具型腔零件的完整制造过程。对现代模具合理设计和优化具有借鉴作用。 相似文献
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尽管模具的设计和制造技术都已成熟,但经验化设计和制造仍占主导作用,特别是模具的配作加工对装配工人的技术要求非常高。对现存模具刃口尺寸和公差计算方法进行优化,结合"入体原则"和孔类、轴类尺寸偏差特点,建立了针对一般性冲压模具刃口尺寸和公差的分开加工计算方法。针对重要工作零件进行ANSYS有限元应力分析,校核其强度。对于整套模具通过理论设计、三维建模和零件加工工艺概述,分析其设计和装配的合理性。利用该计算方法完成了电机定子硅钢片冲压模具刃口的计算,从理论设计上实现了降低装配工人技术要求的目的。 相似文献
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The hysteresis of the magnetostrictive actuator was studied. A mathematical model of the hysteresis loop was obtained on the basis of experiment. This model depends on the frequency and the amplitude of the alternating current inputted to the magnetostrictive actuator. Based on the model, the effect of hysteresis on dynamic output of the magnetostrictive actuator was investigated. Then how to consider hysteresis and establish a dynamic model of a magnetostrictive actuator system is discussed when a practical system was designed and applied. 相似文献
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在磁流体动力学模型的基础上,引入阳极鞘层区简化模型,对直流等离子体电弧流动与传热进行了模拟研究.为研究阳极鞘层区对直流等离子体电弧存在的影响,进行了四组不同条件的模拟计算,并对引入和未引入阳极简化模型的模拟结果进行统计分析.结果表明,电弧阳极鞘层区的存在虽然对电弧最高温度及其温度云图没有明显影响,但对阳极热通量影响较大,使阳极热通量明显降低,并且增大了阳极界面所受剪切力.因此,电弧阳极鞘层区不仅降低电弧热传递效率,而且会导致阳极熔池界面不稳定性增强. 相似文献
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M. A. Ziganshin A. A. Bikmukhametova A. V. Gerasimov V. V. Gorbatchuk S. A. Ziganshina A. A. Bukharaev 《Protection of Metals and Physical Chemistry of Surfaces》2014,50(1):49-54
The effect of a substrate and air humidity on the morphology of a thin film of L-leucyl-L-leucine dipeptide was studied. For this purpose, conditions for obtaining a thin film of the dipeptide were determined by thermal analysis. The morphology of L-leucyl-L-leucine film deposited on the surface of highly oriented pyrolytic graphite (HOPG) and mica at different humidities was studied by atomic force microscopy. It was established that film was formed on the surface of HOPG and uniformly coated with nanostructures, the sizes and shapes of which depended on the film thickness. Crystallization of the dipeptide with the formation of complex crystalline nanosized objects occurs on the surface of mica. An increase in air humidity results in a decrease in the geometric dimensions of nanostructures on the surface of the dipeptide film in the case of HOPG and complication of crystal agglomerate structure when mica was used as a substrate. 相似文献
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Effect of interface wetting on flattening of freely fallen metal droplet onto flat substrate surface
Masahiro Fukumoto Eiji Nishioka Toshikazu Matsubara 《Journal of Thermal Spray Technology》2002,11(1):69-74
A free-falling experiment was conducted as a simulation of a thermal spray process. The flattening behavior of the freely
fallen metal droplet impinged onto a flat substrate surface was investigated in a fundamental way. The substrates were kept
at various temperatures, and the substrates were coated with gold by physical vapor deposition (PVD) and were prepared in
order to investigate the effect of wetting at the splat-substrate interface on the flattening behavior of the droplet. A falling
atmosphere was created with atmospheric pressure of nitrogen to prevent the oxidation of the melted droplet. Experiments under
low-pressure conditions also were conducted. The different types of splat morphology were recognized in experiments conducted
under a nitrogen atmosphere with atmospheric pressure. The splat morphology on a substrate at room temperature was of the
splash type, whereas that on a substrate at high temperature was of the disk type. The microstructure observed on a cross-section
of the splat obtained on the substrate at room temperature was an isotropic coarse grain, whereas that on the substrate at
high temperature was a fine columnar grain. The grain size changed transitionally with increasing substrate temperature. The
temperature of the transition on the gold-coated substrate was higher than that on the naked substrate. The microstructure
of the cross-section of the splat obtained under low pressure was finely columnar even on the substrate at room temperature.
The results indicate that the metal droplet wets better under the low-pressure condition than under the atmospheric pressure
nitrogen condition and that wetting has a significant role in the flattening of the droplet. 相似文献
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假乙内酰硫脲酸在铜-钼浮选分离中的抑制性能(英文) 总被引:3,自引:0,他引:3
将合成的假乙内酰硫脲酸(PGA)用作铜-钼分离抑制剂。该药剂闭路实验结果表明:假乙内酰硫脲酸在较小的用量下对黄铜矿有较强的抑制作用,经一次粗选、一次扫选、两次精选,可获得Mo品位大于26%、回收率大于89%的浮选指标,而用Na2S做抑制剂时钼的回收率下降了2%。药剂吸附量测试结果表明,PGA与丁基黄药在矿物表面发生竞争吸附,PGA在黄铜矿表面上的吸附量远大于在辉钼矿表面的。红外光谱分析表明,PGA在黄铜矿表面是化学吸附,而在辉钼矿表面属于物理吸附。前线轨道计算结果表明,在PAG分子中,硫原子是反应活性的中心。利用矿物、丁黄药及PGA的费米能级能量大小可以从电化学作用角来度解释PGA的抑制机理。 相似文献
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轻卡转向节锻造工艺与模具设计 总被引:1,自引:0,他引:1
通过对轻卡转向节锻件的工艺分析,制定了合理的工艺方案。对锻件在生产过程中可能出现的问题进行了分析,提出了解决办法。还介绍了模具结构特点,合理设计了预终锻模型腔,并估算了终锻成形力,满足设备要求。通过试验锻造出了合格的锻件,验证了该工艺切实可行,模具设计合理可靠。 相似文献