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首页> 外文期刊>Indian Foundry Journal >Elimination of Surface Sink Defect in Skin Forming Alloy Castings by Providing Sink Allowance
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Elimination of Surface Sink Defect in Skin Forming Alloy Castings by Providing Sink Allowance

机译：通过提供沉孔余量来消除表皮成形合金铸件中的表面沉孔缺陷

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摘要

Attempts have been made to eliminate surface sink defect in sink forming alloy castings by providing an allowance instead of use of riser, A sample mathematical model was developed to predict the shape of surface depression on a cylindrical casting with different height-to-diameter ratios. Subsequently, the geometry of projected allowance over the castings required to form a flat horizontal surface on solidification was derived in terms of height and diameter of the castings and % shrinkage of the alloy. Finally, the effectiveness of the sink allowance was verified by experiments with pure aluminium castings. This allowance was not effective due to an effect called as. "Arch Effect", An alternative method of sink allowance is proposed where minor machining would be required at the edges of castings.
机译：已经尝试通过提供余量而不是使用冒口来消除沉部形成合金铸件中的表面沉缺陷。开发了一个示例数学模型来预测具有不同高径比的圆柱形铸件上表面凹陷的形状。随后，根据铸件的高度和直径以及合金的收缩率，得出在凝固时形成平坦水平表面所需的铸件上投影余量的几何形状。最后，通过使用纯铝铸件进行的实验验证了下沉余量的有效性。由于所谓的效应，该津贴无效。 “拱效应”，提出了一种下沉余量的替代方法，该方法需要在铸件边缘进行较小的机械加工。

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