共查询到20条相似文献,搜索用时 156 毫秒
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基于计算机模拟的消失模铸造充型特性 总被引:1,自引:0,他引:1
通过计算机仿真软件ProCAST对某车身覆盖件修边冲孔模模座的消失模铸造充型过程进行数值模拟,研究了消失模铸造的充填特性,并对比分析了消失模铸造和传统铸造充型过程的差异.模拟结果表明,消失模铸造存在着与传统铸造截然不同的充型过程,由于泡沫介质的存在,使金属液充型受阻,充型时间长,并且充型速度呈现周期性交替变化. 相似文献
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铸件充型数值模拟的研究进展 总被引:3,自引:0,他引:3
铸造过程计算机数值模拟技术是当今材料科学的重要前沿领域。本文从铸件充型数值模拟的发展过程、软件的开发状况、计算方法及验证方法等四个方面介绍了国内外铸件充型过程计算机数值模拟的概况。 相似文献
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铸造充型过程数值模拟及实验研究的进展 总被引:2,自引:2,他引:0
铸造充型过程与铸件多种缺陷密切相关,对铸件力学性能有重要影响.对铸造充型过程的数值模拟研究进行了回顾与分析,着重探讨了近年来该方面的研究热点——气体和氧化膜卷入模拟的研究现状,及该方面研究所面临的问题;分析了铸造充型过程实验方法的现状,并展望了铸造充型过程气体和氧化膜卷入模拟的发展. 相似文献
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Effects of the rotary embossing process on mechanical properties in aluminum alloy 1050 sheet 总被引:1,自引:0,他引:1
Heat shields are designed to protect components from heat damage, and one method of producing heat shields is with the embossing
process. The embossing process is a sheet metal-forming method that is utilised in strengthening sheet metals. This method
also increases the surface area useful for heat transfer. In this paper, the effect of this technique on the yield load, tensile
load, bending strength and buckling strength for different sheet thicknesses of aluminium alloy 1050 sheets is investigated.
Furthermore, the efficacy of this forming technique as a method for strengthening the sheets is discussed. 相似文献
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A elastic-plastic finite strip method is presented in this paper to simulate roll-forming process. By introducing the B-spline as its displacement function in longitudinal direction, this technique is suitable for simulating roll-forming and easy to treat its boundary condition. The round tubes forming process is analyzed by using this technique and the calculating results has agood agreement with that of the experiment. 相似文献
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Hosein Bisadi Mehdi Rezazadeh Mohamadi Hadi Miyanaji Maryam Abdoli 《Journal of Materials Engineering and Performance》2013,22(3):875-881
In this study, a method that combines the equal channel angular pressing (ECAP) and twist extrusion (TE) techniques has been introduced as a severe plastic deformation process and investigated by means of the three-dimensional finite element analysis. Owing to the form of the mold which is used in this technique, it can be called the symmetrical channels angular pressing (SCAP) method. This method resembles the more common ECAP process for samples with rectangular cross sections, with the difference that, in this method, the entrance and exit channels at the intersecting corner of the mold also have a twist about their longitudinal axis (as in the TE technique). In this study, to show the characteristics of the SCAP method and to compare it with the ECAP technique, the former method has been simulated by the ABAQUS/Explicit software. Also, to validate the obtained results, the SCAP and ECAP methods were practically applied on samples made of pure commercial aluminum (AA1050). To get the strain distribution along the longitudinal and transverse directions of the samples, Vickers hardness was measured on these samples. The results obtained from these hardness measurements indicate that after one pass, the SCAP method can achieve a higher amount of hardness, compared with the ECAP technique. Moreover, the strain distributions obtained from the simulation and from the samples demonstrate that the SCAP method produces a more homogeneous distribution of strain in the workpieces. 相似文献
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《Science & Technology of Welding & Joining》2013,18(2):147-153
AbstractMany finite element models use adjustable parameters that control the heat loss to the backing bar, as well as the heat input to the weld. In this paper, we describe a method for determining these parameters with a hybrid artificial neural network (ANN) coupled thermal flow process model of the friction stir welding process. The method successfully determined temperature dependent boundary condition parameters for a series of friction stir welds in 3·2 mm thick 7449 aluminium alloy. The success of the technique depended on the method used to input thermal data into the ANN and the ANN topology. Using this technique to obtain the adjustable parameters of a model is more efficient than the conventional trial and error approach, especially where complex boundary conditions are implemented. 相似文献
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Non-destructive methodology for parameterization of Burn-Zinc in the resistance spot welding process
Adriane Cássio Baldim Sebastião Carlos da Costa Thairone Conti Serafini Aguiar 《Welding International》2017,31(4):259-267
Galvanized steels are used in large quantities, mainly in the automotive industry, for their corrosion resistance and low cost. In this industrial sector, these materials are normally welded by the spot welding process. Because galvanized steels have a zinc-based covering layer, welding is normally carried out using a technique called the Burn-Zinc technique, to minimize the harmful effects of the zinc on this material, during the welding cycle. In this context, this work studied a non-destructive method, with the aim of finding suitable removal of this layer of zinc, on the basis of the signals generated by a sensor that records the electrode displacement during the phases of the spot welding process, taking the reading for the thermal expansion of the galvanized steel sheet as a basis. Thus, physical simulation experiments were undertaken, varying the current and the cycle time of the preheating phase. The Burn-Zinc responses generated by the sensor and the visual analyses by attribute were shown as graphs via an operating envelope. The evidence showed that the signal from electrode displacement proved to be an efficient non-destructive method for determining suitable Burn-Zinc parameters in the spot welding process for galvanized steel sheet. 相似文献