Numerical Analysis of Extruding Force in Convex-type Punch Squeezing Casting

Xiang Chun1; Ying Xinfa2

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Numerical Analysis of Extruding Force in Convex-type Punch Squeezing Casting
Vol. 31, Issue 6, Pages: 535-539(2011)
Published： 2011 ，
DOI：

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[1]项春,应新法.凸式冲头挤压铸造中比压的数值模拟分析[J].特种铸造及有色合金,2011,31(06):535-539.

Xiang Chun1, Ying Xinfa2. Numerical Analysis of Extruding Force in Convex-type Punch Squeezing Casting. [J]. Special Casting & Nonferrous Alloys 31(6):535-539(2011)
[1]项春,应新法.凸式冲头挤压铸造中比压的数值模拟分析[J].特种铸造及有色合金,2011,31(06):535-539. DOI：

Xiang Chun1, Ying Xinfa2. Numerical Analysis of Extruding Force in Convex-type Punch Squeezing Casting. [J]. Special Casting & Nonferrous Alloys 31(6):535-539(2011) DOI：

摘要

作为挤压铸造中的一个重要参数

比压严重影响铸件的组织和性能。利用有限元法对凸式冲头挤压铸造进行了热力耦合数值模拟

分析了A356合金铸件比压与显微组织和力学性能的关系

得到了经济的临界比压。结果发现

随着比压增大

缩孔、缩松缺陷逐步减少

直至基本消失。进一步加大比压后

变化不明显

反而增加了模具的负担。随着比压增大

组织晶粒逐步细化

达到120MPa时

晶粒尺寸减小了8%

另外

二次枝晶间距缩小了12.5%

但当比压继续增大之后

没有出现继续细化

反而有粗化的趋势。

Abstract

As an important technical parameter in squeezing casting

the squeezing force is the dominant effects on microstructure and properties of the squeezing castings. Thermodynamic coupling model based on the FEM was employed to simulate squeezing casting convex-type punch and to analyze function of specific pressure with microstructure and mechanical properties of the A356 alloy parts

obtaining economic critical squeezing forces. The results reveal that with increasing in squeezing force

shrinkage porosity （hole） is gradually decreased to be eliminated

and then the further improvement of the defects can be ignored

however

loading of the mould is increased. In addition

with increasing in squeezing force

grain size in the castings is refined

where with 120MPa squeezing force

grain size is decreased by 8%

and secondary arm spacing is narrowed by 12.5%

and then refinement of grain size can be ignored.