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分别对重力铸造和倾转铸造铝合金卡钳的充型过程及凝固过程进行数值模拟,并观察铸件指定测温点下凝固过程中的温度变化并给出铸件色温的变化曲线。结果发现,与重力铸造相比,倾转铸造充型过程更平稳、温度梯度小、气体容易排出且没有缩孔、缩松缺陷,采用1模3件的生产方式,经过模拟试验,发现铸件品质良好,且大大提高了铸件的工艺出品率。 相似文献
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在分析了铸件凝固过程结晶潜热释放和缩孔、缩松形成条件后,应用数值模拟软件模拟了砂芯铸造汽轮机阀体的凝固过程,得到阀体铸件凝固的温度梯度分布,并预测了铸件出现缩松、缩孔缺陷的部位。在此基础上,对铸件凝固过程进行了阐述。数值模拟结果可供阀体铸造工艺设计参考。 相似文献
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利用铸造模拟分析软件AnyCasting,对铝合金缸盖罩铸件进行了凝固过程数值模拟,预测其在铸造过程中可能产生缺陷的位置,分析了铸件预铸孔部位产生缩孔缺陷的原因,对压铸模具进行反复修改和优化。模拟计算了多种改进措施,通过在铸件最后凝固部位增设冷却水管及补缩通道等方法,达到减少或消除缩孔缺陷的目的。模拟结果表明:采用改进的工艺方案可明显改善缩孔缺陷,有利于提高铸件质量。 相似文献
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《特种铸造及有色合金》2021,(5)
采用铸造模拟软件EasyCast和NovaCast对镁合金隔板铸件低压铸造工艺过程进行数值模拟,发现隔板铸件凝固过程未遵循顺序凝固原则并有缩孔产生,通过添加冷铁进行工艺改进。模拟结果发现,改进前后,两款软件预测的凝固温度场基本一致,缩孔尺寸略有差异,但缩孔位置大致相同,表明模拟结果可信。结果表明,铸件厚壁部分容易产生缩孔、缩松缺陷,通过冷铁的设置,能够有效加强补缩效果,改善缩孔缺陷。 相似文献
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低压铸造铝合金轮毂充型与凝固模拟 总被引:6,自引:1,他引:5
在低压铸造过程温度场及流场实验的基础上,开发了基于SOLAVOF算法的充型与凝固过程数值模拟软件,对72-46轮毂铸件进行了模拟分析。结果表明,低压铸造充型过程中降温明显,准确的凝固模拟必须首先考虑充型。针对轮毂铸件的充型特点,开发了简化充型模拟软件。简化模拟得到的初始温度场与采用SOLAVOF算法的模拟结果基本吻合,实现了为后续凝固模拟提供正确的初始温度场的设计目标。 相似文献
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EXPERIMENTAL RESEARCH AND NUMERICAL SIMULATION OF MOLD TEMPERATURE FIELD IN CONTINUOUS CASTING OF STEEL 总被引:1,自引:0,他引:1
X.S. Zheng M.H. Sha J.Z. Jin 《金属学报(英文版)》2006,19(3):176-182
Mold is the heart of the continuous casting machine. Heat transfer and solidification in a water cooled mold are the most important factors during the continuous casting of steel. For studying the temperature distribution of a mold wall, a simulated apparatus of mold was designed and experiments were performed by it. The measured results indicated that the mold wall temperature approaches the temperature of cooling-water. An equivalent thermal-conductivity coefficient was proposed and deduced on the basis of the conclusion of the experiments. This coefficient was applied to solve the heat transfer between the melt and cooling water, and to characterize the heat transfer capacity of the mold. By this equivalent thermal-conductivity coefficient, it is very easy and convenient to numerically simulate the solidification process of continuous casting. And the calculation results are in agreement with the experiments. The effects of casting speed and water flow rate on the mold temperature field were also discussed. 相似文献
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针对大平板类铝合金壳体铸件的外形尺寸大、结构复杂等特点,通过三维温度场数值模拟来揭示铸件的凝固过程。根据准固态力学行为和流变行为,进行应力场模拟,进而预测铸件在凝固过程中产生缩松、缩孔以及热裂和变形等倾向,合理地实现了铸件的铸造工艺优化设计。 相似文献
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Numerical simulation of low pressure die-casting aluminum wheel 总被引:1,自引:0,他引:1
The FDM numerical simulation software, ViewCast system, was employed to simulate the low pressure die casting (LPDC) of an aluminum wheel. By analyzing the mold-filling and solidification stage of the LPDC process, the distribution of liquid fraction, temperature field and solidification pattern of castings were studied. The potential shrinkage defects were predicted to be formed at the rim/spoke junctions, which is in consistence with the X-ray detection result. The distribution pattern of the defects has also been studied. A solution towards reducing such defects has been presented. The cooling capacity of the mold was improved by installing water pipes both in the side mold and the top mold. Analysis on the shrinkage defects under forced cooling mode proved that adding the cooling system in the mold is an effective method for reduction of shrinkage defects. 相似文献
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采用大型商业软件ProCAST建立了钢锭凝固传热数值仿真,钢锭模在凝固过程中的温度场是空间和时间的变化量,属于三维不稳定态传热。为了验证钢锭凝固过程温度场变化对钢锭冶金缺陷的影响,本文采用24寸42CrMo钢种钢锭模进行数值仿真。采取钢锭浇注过热度、断面温度梯度、液相线和固相线的分析,模拟了钢锭凝固过程中温度场、凝固分数、缩松率及Niyama的分布。通过仿真与实际操作工艺相结合,以及钢锭的超声检测和解剖验证的低倍检验,证明了仿真技术和超声检测可以提高钢锭的冶金质量。 相似文献
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通过对活塞式压缩机缸体底注工艺方案的充型和凝固过程的数值模拟,揭示了缸体的液相分布、温度场分布及凝固顺序,通过及时补浇冒口和冷铁激冷等措施,使下高上低的温度场分布变为下低上高的分布趋势,从而改善了缸体在凝周过程中的液相分布,改变了先中间后两头的凝固顺序,缸体从总体上形成了从下往上的有利于补缩的凝固顺序,并预测了压缩机缸体缩孔、缩松产生的部位和大小。采用改进后的工艺进行生产,取得成功,从而验证了模拟结果的正确性。 相似文献