华南理工大学学报(自然科学版) ›› 2011, Vol. 39 ›› Issue (1): 100-105.doi: 10.3969/j.issn.1000-565X.2011.01.019

• 机械工程 • 上一篇    下一篇

压铸充型过程的SPH方法建模及数值模拟

曹文炅1 周照耀1 何毅1 吴菲2   

  1. 1.华南理工大学机械与汽车工程学院,广东广州510640;2.广州华立科技职业学院,广东广州51 1325
  • 收稿日期:2010-06-23 修回日期:2010-08-19 出版日期:2011-01-25 发布日期:2010-12-01
  • 通信作者: 曹文炅(1983一),男,博士生,主要从事精密模具成型及数值模拟研究 E-mail:wenjiong.cao@gmail.com
  • 作者简介:曹文炅(1983一),男,博士生,主要从事精密模具成型及数值模拟研究
  • 基金资助:

    粤港关键领域重点突破项目(2007Z010);广东省重大科技专项(2008A080800022)

SPH Modelling and Validation for Filling Process of HPDC

Cao Wen-jiong1 Zhou Zhao-yao1 He Yi1 Wu Fei2   

  1. 1.South China university of technology, mechanical and automotive engineering school, guangdong guangzhou 510640;2.Guangzhou holley technology professional college, guangdong guangzhou 51 1325
  • Received:2010-06-23 Revised:2010-08-19 Online:2011-01-25 Published:2010-12-01
  • Contact: 曹文炅(1983一),男,博士生,主要从事精密模具成型及数值模拟研究 E-mail:wenjiong.cao@gmail.com
  • About author:曹文炅(1983一),男,博士生,主要从事精密模具成型及数值模拟研究
  • Supported by:

    粤港关键领域重点突破项目(2007Z010);广东省重大科技专项(2008A080800022)

摘要: 基于欧拉描述的数值方法在求解压铸充型过程自由表面问题方面存在一定困难. 为提高自由表面数值模拟的准确性, 本文建立了基于纯拉格朗日描述的压铸充型过程SPH方法计算程序. 引入Monaghan边界模型建立了型腔壁面边界条件, 通过划分入流区域粒子和流体粒子实现了入流边界条件. 采用本程序计算了M.Schmid验证模型, 并分别与实验结果以及FDM计算结果进行了对比. SPH方法计算结果更好地捕捉了充型阶段自由表面分布, 并准确获得了充型形成的空穴的位置和大小.

关键词: 压铸, 光滑粒子流体动力学方法, 边界条件, 充型计算

Abstract:

The numerical method based on Eulerian description is difficult to solve the free surface flow in filling process of high pressure die casting(HPDC). In order to improve the accuracy of free surface’s numerical simulation, a smoothed particle hydrodynamics(SPH) program with pure largrangian description was established in this paper for HPDC filling process’s calculation. Monaghan boundary type was introduced to modelling the solid wall boundary condition of mold cavity. Inlet boundary condition was implemented by dividing inlet region particles and flow region particles. The validation model given by M.Schmid was calculated by this SPH program, and the simulation results were compared with both experimental and FDM simulation results. The SPH results were better able to describe the distribution of free surface during the filling process, further more the voids formed in filling process could be captured precisely in respect of location and dimension.

Key words: HPDC, SPH method, boundary conditions, filling simulation