共查询到18条相似文献,搜索用时 63 毫秒
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针对电镦成形工艺,提出了一种变体积镦粗的网格再划分算法,并研究叙述了电镦有限元模拟技术中的网格畸变、节点优化及新旧网格场量传递等问题。 相似文献
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针对电镦成形工艺,提出了一种变体积镦粗的网格再划分算法,并研究叙述了电镦有限元模拟技术中的网格畸变、节点优化及新旧网格场量传递等问题。 相似文献
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采用有限元分析软件DEFORM对轮胎螺母挤镦复合成形过程进行数值模拟,分析了工件及冲头的温度场。在工民形过程中遇到的难点和 冲头的温度不断变化,呈冷、热交替而且温度分布不均匀。 相似文献
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针对非规则几何区域的有限元网格剖分,提出了栅格法与推进法结合的新的三角形自适应剖分算法、三角形单元网格的动态自适应加密和聚合算法和基于板料模具穿透量的加密判据和基于法矢量的聚合判据,实现了空间三角形单元网格的划分、自适应加密、动态聚合和重划分. 相似文献
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《中国有色金属学会会刊》2022,32(10):3276-3290
A kind of surface instability, basin-like depression defect companied by mixed grain structure at the bottom of large-scale valve during electric upsetting process, would significantly influence the microstructures and mechanical properties of components. In order to analyze the forming process of the basin-like depression defect, a finite element model for the electric upsetting process of Ni80A superalloy was developed using multi-field and multi-scale coupling analysis method. Subsequently, a series of parameters loading path schemes for force and current were designed by varying the initial value, peak value and value level, and their effects on basin-like depression and mixed grain structure were simulated and uncovered. It is concluded that the changes of heating speed and pressurization speed result in the different flow velocities between the inner and outer layers of billet, thus exerting the basin-like depression. Simulation results also indicate that these defects can be optimized through the parameter coordination between force and current. Finally, the validity and reliability of the finite element model were verified by physical experiments in electric upsetting process. 相似文献
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研究了国际上先进的医用骨钉的镦锻加工工艺。采用不等径活阴模技术,克服了球形头骨钉头部镦锻成形时冲头脱模困难的问题,成形了骨钉驱动槽和头部基本轮廓,然后采用专用机床进行头部轮廓修整和尾部螺纹引导加工,最后进行螺纹成形等工序。与采用传统棒料直接进行车制工艺相比,采用镦锻加工工艺可使材料利用率提高1倍以上,生产效率提升2倍以上。对镦锻成形的Ti6Al4V ELI和Ti6Al7Nb材料骨钉进行了金相组织、硬度和扭转性能检测,其试件的金相组织和硬度均满足相应标准的要求,最大扭矩和断裂扭转角与车制加工骨钉基本相当,因此证明了镦锻工艺可替代现有棒料的直接车制工艺。 相似文献
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整体锻造挤压辊是整个辊压机的关键部件,形状短粗,是大型粗短轴类零件的代表,锻透性较差;空洞型缺陷是造成产品合格率低的一个重要因素,必须消除.本文利用Deform-3D模拟软件,对两次镦拔新工艺应用于RP170-110挤压辊的第1次镦拔过程进行了理论验证.通过对镦粗后采用WHF法和FM法拔长过程的数值模拟结果进行对比,说明两次镦拔新工艺中的第1次镦拔工艺-镦粗 WHF法拔长能够在足够大的三向压应力状态下,在再结晶温度以上愈合孔洞型缺陷,提高了大型短粗轴类锻件的锻透性.8件锻件全部试制合格的结果也证明了两次镦拔新工艺第1次镦拔的合理性. 相似文献