Control structure for solidification time of inner sprue of vacuum suction casting mold

Abstract

The invention relates to a control structure for a solidification time of an inner sprue of a vacuum suction casting mold. The control structure is a key ring for improving the production takt of thevacuum suction casting. During the suction casting process, firstly, molten iron is mold-filled stably, meanwhile, a feeding effect can be achieved on the large-thickness part, a unique characteristicof the suction casting is that after physical phenomena are finished, the molten iron can flow back to a crucible from a sprue, and the effect of improving the rate of finished products is achieved.The reflow of the molten iron must be performed after the inner sprue is solidified, and the inner sprue is not controllable only by virtue of the cooling of the molten iron. Due to the fact that twopieces of cold iron are additionally arranged at the upper part and the lower part of the inner sprue, the solidification time of the molten iron in the chilling action of the inner sprue is changed,and the casting production speed can be greatly improved.

Description

technical field [0001] The technological measures of vacuum suction casting in the foundry industry are mainly the control technology of the solidification time of the inner gate. Background technique [0002] Vacuum suction casting is a relatively special casting process in the casting process. It is the opposite of gravity casting, but uses the pressure difference generated by the vacuum degree to perform anti-gravity casting. This method brings certain advantages to mold filling and feeding, because there is no air resistance in the mold cavity, and the force on the molten iron is not only its own weight but also the external force caused by the pressure difference. But vacuum suction casting also has its certain limitations. For example, the molten iron is sucked into the cavity from the crucible through the riser, enters the sprue of the mold from the riser, and then flows into the cavity from the sprue through the ingate of the mold. These series of physical phenomen...

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Problems solved by technology

[0003] From the technical level of the ingate, a larger section is beneficial to filling and feeding, but the solidification time will be longer, which is an important factor affecting the production efficiency of vacuum suction casting.

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