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Fig. 4. Hot tearing was found in the post to jour- nal transition area.


图4:热裂出现在支柱 到横柄的过渡部位。


• Total die cycle dwell time. Because the casting was currently in production, tool- ing was in place, so the research team could not make any changes to the design that would disrupt production during casting trials. Before initial trials, the team used simulation software to ensure the gating system was properly designed before pouring. Predictive modeling allowed the research team to ensure the casting could be poured at a reasonable mold temperature that will avoid hot shortness but still have enough strength to withstand ejection stresses. 3-D CAD models of the casting with rigging were


provided by Eck Industries Inc. to Product Development & Analysis for analysis. Te simulation suggested minor shrinkage would be discovered in the areas under risers when the die was opened (shown in Fig. 2). Additionally, hot tearing was likely near the top cross bar and in the transition from the post to the shaft area (Fig. 3). Toward the end of solidification, hot tearing looked to develop where the top post transitioned into the journal areas (Fig. 4). Tese problematic locations correlated with observed hot tearing on the bracket component. Hot tearing tended to


develop when the fraction solid, the percentage of


• 型内停留总时长。


由于该铸件目前正在生产中,设备已安装好,研 究小组不能对现有的设计做任何改动,否则试验时 就会干涉生产。在开始试验之前,科研小组借助模 拟软件确保浇注系统设计正确。预测性的建模拟使 研究小组可以保证在合理的温度下浇注铸件,不仅 可以避免热脆性,同时其强度还足以承受脱型时的 顶压应力。


Eck工业公司为产品开发及分析部门提供配备了相 关装置、供分析用的3D CAD铸造模型。模拟系统显 示,金属型开启时,冒口下方可能有小缩孔(如图2 所示)。此外,在上横臂附近,以及从支柱到横柄 过渡部位可能出现热裂(如图3所示)。在凝固过程 的最后,在顶部支柱到轴颈的过渡部位还可能产生 热裂(如图4所示) 。支架铸件上的这


Fig. 5. The two thermocou- ples were attached to the moving half of the perma- nent mold.


图5:两个附着在金属型移 动部分的热电偶。


March 2015 FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 43


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