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Method for forecasting defects of shrinkage cavity of ductile iron castings based on finite elements

A technology of ductile iron and prediction methods, which is applied in the direction of material defect testing, etc., can solve the problems of poor prediction accuracy of shrinkage cavity defects of ductile iron castings, and achieve the effect of shortening the design cycle, saving time, and accurately expanding the value of the cavity

Active Publication Date: 2009-06-03
CSIC NO 12 RES INST
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for predicting shrinkage cavity defects of ductile iron castings based on finite elements, which fully considers the influence of graphitization expansion and cavity expansion in the solidification process of ductile iron castings, and solves the problem of existing prediction methods on ductile iron castings. The problem of poor prediction accuracy of shrinkage cavity defects

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  • Method for forecasting defects of shrinkage cavity of ductile iron castings based on finite elements
  • Method for forecasting defects of shrinkage cavity of ductile iron castings based on finite elements
  • Method for forecasting defects of shrinkage cavity of ductile iron castings based on finite elements

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[0042] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043]The prediction method of the present invention adopts the breadth-first search method of graphs to process massive finite element data technology in the process of casting process analysis, and dynamically considers the influence of graphitization expansion and cavity expansion from the formation mechanism of microstructure in the calculation of solidification process, through Input the temperature field results and casting geometry files calculated by the commercial finite element software ProCAST, set control parameters and calculation parameters, and output the result files after calculation, which can show the position and size of shrinkage cavity formation in ductile iron castings, so as to achieve prediction The purpose of shrinkage defects. First, use ProCAST software to obtain the temperature field file and geometry file within ...

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Abstract

The invention discloses nodular iron casting shrinkage hole failure prediction method based on finite element. It adopts finite element processing simulation ProCAST to analyze nodular iron casting to gain cavity fill and temperature field analysis document, calculate unite solid phase ratio, volume, and eutectic expansion rate, search sealed and isolated areas, calculate whole volume changed value and output, and judge the shrink defects. The invention can process quantification forecast for nodular iron casting shrinkage-hole defect, and offer exact forecast reference for engineering production.

Description

technical field [0001] The invention relates to a method for predicting shrinkage cavity defects of metal materials, in particular to a method for predicting shrinkage cavity defects of ductile iron castings based on finite element technology. Background technique [0002] The solidification process of ductile iron has both liquid contraction, solidification contraction and graphitization expansion, so the solidification process of ductile iron is actually the result of dynamic superposition of contraction and expansion, so the prediction of shrinkage cavity defects in ductile iron castings is more accurate than that in the solidification process It is more complicated to only consider the solidification shrinkage of cast steel and aluminum castings. The existing shrinkage cavity prediction methods for ductile iron castings are difficult to reflect the dynamic superposition of shrinkage and expansion during the solidification process of ductile iron castings, and most of the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/72
Inventor 马敏团陈鹏波黄引平郝炜
Owner CSIC NO 12 RES INST