| 金属材料触变充填及其压力变化特征的模拟 |
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| 引用本文： | 杨卯生,李士琦,徐宏,毛卫民,钟雪友.金属材料触变充填及其压力变化特征的模拟[J].北京科技大学学报,2004,26(3):255-259,276. |
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| 作者姓名： | 杨卯生 李士琦 徐宏 毛卫民 钟雪友 |
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| 作者单位： | 1. 北京科技大学冶金与生态工程学院,北京,100083
2. 北京科技大学材料科学与工程学院,北京,100083 |
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| 摘 要： | 分析了触变合金充填过程的压力变化特征,建立了耦合表观粘度的计算数学模型.对触变铝合金和钢件充型过程及压力变化进行模拟.结果表明,触变合金充型过程具有持续增加的压力变化特征,增加压力主要克服浆料流动阻力与重力,增加幅度约为0.12MPa.在成形充填速度范围内,触变合金呈现稳定的层流充填特征.相比触变铝合金,钢温度高容易引起触变成形过程的降温,表观粘度增大而导致铸件缺陷.半固态刹车泵体两种入流形式的充填压力模拟分析与实际成形结果表明,径向入流方式具有较高的成形质量.
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| 关 键 词： | 触变充型 充填压力 数值模拟 金属材料 充填压力 变化特征 模拟分析 Forming Metal Material during Behavior Pressure Filling Process Thixotropic Simulation 成形质量 入流 径向 流形 刹车泵体 半固态 铸件缺陷 |
Numerical Simulation for Thixotropic Filling Process and Filling Pressure Behavior during Metal Material Forming |
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| YANG Maosheng,LI Shiqi,XU Hong,MAO Weimin,ZHONG Xueyou Metallurgical and Ecological Engineering School,University of Science and Technology Beijing,Beijing ,China Materials Science and Engineering School,University of Science and Technology Beijing,Beijing ,China.Numerical Simulation for Thixotropic Filling Process and Filling Pressure Behavior during Metal Material Forming[J].Journal of University of Science and Technology Beijing,2004,26(3):255-259,276. |
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| Authors: | YANG Maosheng LI Shiqi XU Hong MAO Weimin ZHONG Xueyou Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijing China Materials Science and Engineering School University of Science and Technology Beijing Beijing China |
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| Institution: | YANG Maosheng,LI Shiqi,XU Hong,MAO Weimin,ZHONG Xueyou Metallurgical and Ecological Engineering School,University of Science and Technology Beijing,Beijing 100083,China Materials Science and Engineering School,University of Science and Technology Beijing,Beijing 100083,China |
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| Abstract: | Based on the behavior of filling pressure during semisolid alloy slurry filling process, a mathematic
model of slurry flow coupled with apparent viscosity was established. The filling process and filling pressure of
thixotropic Al alloys and steel were simulated. It is demonstrated that the filling pressure gradually increases with
the course of the filling, in response to flow resistance and gravity and with a range of 0.12 MPa. Semisolid alloy
slurry flows in a stable and laminar-type manner within the range of filling velocity. Compared with thixotropic Al
alloys, the high melting point of steel leads to the decrease of filling temperature easily, so the increase of apparent
viscosity results in casting defects. The simulation results of filling pressure and the experimental results of semiso-
lid brake pump casting show that semisolid casting filled along the radial presents good forming quality. |
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| Keywords: | thixotropic filling filling pressure numerical simulation |
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