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预埋内流道模具在铸造过程中,预埋管道壁薄(2~6 mm),管细(10~20 mm),在高温下容易出现坍塌变形,造成内流道堵塞,不能保证内流道的流通性。针对这一问题,采用数值模拟分析内流道模具的铸造工艺,分别以无填充介质(空心管)、锆英砂、铁粉、氩气四种媒介填充无缝钢管(准18 mm×4 mm),得到管道不同位置在浇铸过程中的温度-时间曲线,采用试验验证数值模拟的可靠性。结果表明:在浇铸过程中,空心管在2 min左右达到峰值1 369℃,管道产生坍塌变形;管道内充填锆英砂时,在实验条件下,管道没有出现坍缩变形,保证了管道的流通性。
In the process of casting the inner flow channel mold, the buried pipe wall is thin (2 ~ 6 mm) and thin (10 ~ 20 mm) in the casting process, which is prone to collapse and deformation under high temperature, causing the inner flow channel to be blocked, Road circulation. In order to solve this problem, the numerical simulation was used to analyze the casting process of the inner flow channel mold. The seamless steel tubes (quasi-18 mm × 4 mm) were filled with four media without filling media (hollow tube), zircon sand, iron powder and argon ), The temperature-time curves of different positions in the pipeline during casting are obtained, and the reliability of numerical simulation is validated by experiments. The results show that during the casting process, the hollow tube reaches a peak value of 1 369 ℃ in about 2 min, and the pipeline collapses and deforms. When the zircon sand is filled in the pipeline, under the experimental conditions, the pipeline does not collapse and deform, ensuring the flowability of the pipeline .