Dynamic pressure-based gravity casting shrinkage cavity defect detection method

A technology of gravity casting and prediction method, which is used in measuring devices, testing metals, material inspection products, etc., can solve problems such as affecting prediction accuracy, imperfect distribution of shrinkage holes in isolated liquid phase areas, etc., and achieves the effect of good reference value.

Active Publication Date: 2017-08-04
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0003] At present, those skilled in the art have done some research. For example, in order to simplify the model, most algorithms use a simple critical solid phase ratio as a method to judge multiple isolated liquid phase regions, and for the distribution of shrinkage cavities in each step stat

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  • Dynamic pressure-based gravity casting shrinkage cavity defect detection method
  • Dynamic pressure-based gravity casting shrinkage cavity defect detection method
  • Dynamic pressure-based gravity casting shrinkage cavity defect detection method

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0025] see Figure 1 to Figure 3 , the gravity casting shrinkage cavity defect prediction method based on dynamic pressure provided by the preferred embodiment of the present invention, the gravity casting shrinkage cavity defect prediction method mainly includes the following steps:

[0026] Step 1, building a three-dimensional model of the gating system, and initializing the gating system ...

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Abstract

The invention belongs to the technical field of shrinkage cavity predication correlation in a gravity casting solidification process and discloses a dynamic pressure-based gravity casting shrinkage cavity defect detection method. The method comprises the following steps of (1) initializing a casting system; (2) deducing a critical pressure value as a boundary criterion of isolated liquid-phase region searching to search out distribution of isolated liquid-phase regions at one moment, if the isolated liquid-phase regions exist, turning to the step (3), or else, completing the process; (3) successively judging whether the isolated liquid-phase regions are split and annihilated or not, if the isolated liquid-phase regions are split, turning to the step (4), if not judging whether the isolated liquid-phase regions are annihilated or not, if not, turning to the step (4), or else, turning to the step (5); (4) searching the distribution of shrinkage cavities of each isolated liquid-phase region, calculating and equally superposing the shrinkage increment of the isolated liquid-phase regions to searched grid; and (5) updating the liquid phase rates of all regions and circulating until all isolated liquid-phase regions disappear.

Description

technical field [0001] The invention belongs to the relevant technical field of shrinkage cavity prediction in the solidification process of gravity casting, and more specifically relates to a method for predicting shrinkage cavity defects in gravity casting based on dynamic pressure. Background technique [0002] Alloy density changes with temperature, resulting in a slight decrease in alloy volume during solidification, and the feeding of molten metal causes shrinkage cavities or shrinkage defects in some areas due to the lack of external metal liquid supplementation. For castings, it is very important to design a suitable gating system and riser to reduce or completely avoid shrinkage cavity and porosity defects on the casting body. Before the solidification process starts, the liquid feeding channel is relatively smooth; when the solidification process starts, solid nucleation particles are gradually formed in the metal liquid, and the solid nucleation particles make the...

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Application Information

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IPC IPC(8): G01N33/20
CPCG01N33/205
Inventor 周建新殷亚军凌云沈旭计效园
Owner HUAZHONG UNIV OF SCI & TECH
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