免耕播种机开沟圆盘水射流淬火工艺数值模拟及验证

针对免耕播种机开沟圆盘整体淬火后硬度不足且易翘曲变形的问题，该文提出一种水冲击射流淬火方法，利用DEFORM软件对开沟圆盘淬火过程中的硬度和翘曲变形量进行数值模拟，分析了射流阵列参数（喷嘴间距、喷嘴直径和射流速度）对淬火结果的影响，并对工艺参数的优选数值进行了试验验证，二者显示了较好的一致性。结果表明：喷嘴间距是关键工艺参数，当喷嘴间距取4～5 mm时，开沟圆盘可以整体淬透，硬度达到45～49 HRC。开沟圆盘的变形量与喷嘴间距呈抛物线关系，当喷嘴间距取5～6 mm时，变形量达到最大值1.80×10^-2～3.30×10^-2 mm，淬透后变形量较小。随射流速度的增大，开沟圆盘硬度及变形量均增...

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Bibliographic Details
Published in农业工程学报 Vol. 30; no. 22; pp. 21 - 29
Main Author 刘敬 熊绍平 李洪文 徐杨 凌刚
Format Journal Article
LanguageChinese
Published 中国农业大学工学院,北京,100083 2014
Subjects
农业机械
开沟圆盘
数值分析
水冲击射流
淬火
agricultural machinery
water impinging jet
disc opener
淬火
水冲击射流
开沟圆盘
数值分析
numerical analysis
quenching
农业机械
Online AccessGet full text
ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2014.22.003

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Summary:针对免耕播种机开沟圆盘整体淬火后硬度不足且易翘曲变形的问题，该文提出一种水冲击射流淬火方法，利用DEFORM软件对开沟圆盘淬火过程中的硬度和翘曲变形量进行数值模拟，分析了射流阵列参数（喷嘴间距、喷嘴直径和射流速度）对淬火结果的影响，并对工艺参数的优选数值进行了试验验证，二者显示了较好的一致性。结果表明：喷嘴间距是关键工艺参数，当喷嘴间距取4～5 mm时，开沟圆盘可以整体淬透，硬度达到45～49 HRC。开沟圆盘的变形量与喷嘴间距呈抛物线关系，当喷嘴间距取5～6 mm时，变形量达到最大值1.80×10^-2～3.30×10^-2 mm，淬透后变形量较小。随射流速度的增大，开沟圆盘硬度及变形量均增加，当射流速度为1～6m/s时，增幅较大，当射流速度＞6 m/s时，增幅趋缓。在喷嘴直径为4～12 mm范围内，开沟圆盘硬度及变形量均随喷嘴直径加大而增加。优化后的工艺参数为：喷嘴间距为4～5 mm,喷嘴直径为6～8 mm，射流速度为3～6 m/s；此时，开沟圆盘硬度可达45～49 HRC，变形量为1.28×10^-2～2.49×10^-2 mm。
Bibliography:agricultural machinery;quenching;numerical analysis;water impinging jet;disc opener
Liu Jing, Xiong Shaoping, Li Hongwen, Xu Yang, Ling Gang （College of Engineering, China Agricultural University, Beijing 100083, China）
11-2047/S
The disk opener is the key part of no-tillage planter and belongs to the ultrathin component. The ratio of its diameter and thickness is over 100. It is prone to end up with large deformations during the quenching process. Thus, how to reduce the deformation through optimizing the quenching parameters under the premise of achieving martensite and high hardness property is both a meaningful and challenging subject. In this paper, a new method of water jet impingement was proposed to quench the disc opener. The finite element analysis software DEFORM had been utilized to simulate the water jet impingement quenching process of the disc opener and optimize the quenching parameters. The velocity of the jet current, nozzle diameter and nozzle spacing had been selected as the process parameter
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2014.22.003