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Method for searching isolated zone when casting solidification

A casting and isolation technology, applied in the field of numerical simulation of the solidification process, can solve the problems that the isolated areas may shrink, some isolated areas are expanding, and there is no one, and achieve the effects of easy programming, fast speed, and favorable promotion and application

Inactive Publication Date: 2008-07-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many isolated areas can be formed in different parts of a casting, and the volume changes in each isolated area are also different. Some isolated areas may shrink, while others are expanding, so they must be distinguished, because the isolated areas are formed The basic conditions of shrinkage cavity and porosity, if the isolated area is found, the area that may form shrinkage cavity and shrinkage porosity can be found. On the other hand, if the isolated area is found, the solidification shrinkage or expansion in each isolated area can be calculated separately, so People are trying to find a method to obtain the three-dimensional shape of the isolated area without destroying the casting, but so far there is no effective method for searching the isolated area

Method used

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  • Method for searching isolated zone when casting solidification
  • Method for searching isolated zone when casting solidification
  • Method for searching isolated zone when casting solidification

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Experimental program
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specific Embodiment approach 1

[0074] Embodiment 1: A method for searching for isolated regions when a casting is solidified, using the well-known "three-dimensional finite difference meshing software" to divide the established three-dimensional solid of the casting to obtain the three-dimensional finite difference mesh information of the casting, Then cooperate with the existing "casting solidification process numerical simulation software" system to calculate the casting solidification process, obtain the solidification process diagram of any cross-section in the casting solidification process, and perform breadth search, correlation search and By sorting, the number and size of isolated regions on the casting section can be obtained.

[0075] Breadth search is a general search for the entire casting section (or solid) (with grid features after subdivision processing). The search method is to start from any subdivision unit and check the properties of the unit. If the unit is a casting unit, and the unit ...

specific Embodiment approach 2

[0108] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the "8 units" in the e step, f step, i step and j step in the specific embodiment 1 are changed to "26 units", The number and size of the isolated area of ​​the casting can be obtained in the three-dimensional space. Since the shape of the isolated area is changing every moment, with the "3D solidification numerical simulation software" to simulate the solidification process of the casting, different The degree of solidification of time castings.

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Abstract

The invention relates to a method for searching the isolated area when the cast is solidified, belonging to the digital simulate technique in solidify process. It uses three-dimension limited differential grid analyze software, to grid the cast three-dimension solid, and process wide search, relation search and sequence on the solidify process section of any section, to attain the number and size of isolated area on the cast section. The invention can realize quantitative prediction of contracted hole, with simple process and high speed, while it can search isolated area on two-dimension section and three-dimension space. It can be used in general mould sand casting, eccentric casting, pressure, casting, etc.

Description

technical field [0001] The invention relates to a method for searching an isolated area when a casting is solidified by using a computer, and belongs to the technical field of numerical simulation of the solidification process. Background technique [0002] Whether it is ferrous metal or non-ferrous metal, the shrinkage cavity and shrinkage defects are due to the formation of isolated areas during the solidification process (that is, the liquid metals in different parts are not connected to each other due to solidification and solid phase formation), and the isolated areas The shrinkage of the metal inside cannot be replenished in time by other parts of the liquid metal. The liquid metal is connected to each other when it is just filled with the mold, but in the subsequent solidification process, because the modulus of different parts of the casting is different, the solidification speed is also different. When the solid phase ratio around the liquid metal is greater than th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/30G06F17/50
Inventor 吴士平郭景杰李邦盛毕维生苏彦庆傅恒志
Owner HARBIN INST OF TECH