大耕深旋耕刀激光冲击强化残余应力研究

奚小波; 缪宏; 赵荔; 朱河霖; 张瑞宏; 金亦富

doi:10.11858/gywlxb.2015.01.009

大耕深旋耕刀激光冲击强化残余应力研究

doi: 10.11858/gywlxb.2015.01.009

扬州大学机械工程学院，江苏扬州 225127

基金项目: “十二五”农村领域国家科技计划课题(2011BAD20B03-02)；江苏省农机三新工程项目(NJ2012-11)；江苏省科技支撑计划(BY2012164，BE2014356)

详细信息

作者简介:
奚小波(1989—)，男，硕士研究生，主要从事材料加工技术研究.E-mail:xxbctg@126.com

通讯作者:
缪宏(1981-), 男, 博士, 副教授, 主要从事抗疲劳制造技术研究.E-mail:mh0514@163.com

中图分类号: TG115.22
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出版历程
- 收稿日期: 2013-09-17
- 修回日期: 2013-12-03

Study on Residual Stress of Big Tilling Depth Rotary Blade for Laser Shock Peening

College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China

摘要

摘要: 研究了激光冲击强化对回转半径为350 mm大耕深旋耕刀残余应力的影响，利用ANSYS对旋耕刀进行理论应力分析，发现应力集中在刀柄外弯角处，同时进行了激光冲击强化模拟，得到理论残余应力引入值。利用X射线衍射法对激光冲击强化前后旋耕刀表面进行了残余应力测试。结果表明，ANSYS模拟激光冲击强化引入的残余应力值与试验实测的结果吻合得较好，相比未经处理的旋耕刀，激光冲击强化后刀具表面残余应力明显增大，最大残余压应力达412.25 MPa，增幅达166%，残余压应力的引入可消除旋耕刀工作的应力集中，提高了刀具使用寿命。研究结果为进一步提高和优化大耕深旋耕刀制造工艺提供了新的参考依据。
- 大耕深旋耕刀 /
- 激光冲击强化 /
- 残余应力 /
- ANSYS /
- X射线衍射法
Abstract: The effect of residual stress of big tilling depth rotary blade with 350 mm turning radius for laser shock peening (LSP) was researched, and the theoretical stress of rotary blade were analyzed by ANSYS.The stress concentration region was at the outer corner of tool shank.The LSP process was also simulated by ANSYS and the theoretical introduced value of the residual stress was obtained.Value of residual stress before and after LSP were tested by X-ray stress meter.The results show that the simulation value fits well with the experimental value, and the residual stress after LSP changes effectively with the maximum reaches 412.25 MPa and a amplification of 166%.The introduced residual compressive stress could eliminate the stress concentration of the working rotary blade, and raise its using life.It provides a new basis for further improvement and optimization of big tilling depth rotary blade's manufacture technique.
- big tilling depth rotary blade /
- laser shock peening /
- residual stress /
- ANSYS /
- X-ray diffraction method

HTML全文

图 1 (a) 位移分布等值线图(b)应力分布等值线图

Figure 1. (a) Isoline of displacement distribution (b) Isoline of stress distribution

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图 2 激光冲击波加载曲线

Figure 2. Shock wave of laser loading curve

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图 3 (a) 旋耕刀冲击强化前准备(b)残余应力测点位置

Figure 3. (a) The preparation before LSP (b) Residual stress measuring point location

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图 4 激光冲击仿真与实测残余应力

Figure 4. Residual stress datum of simulation and experiment after LSP

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图 5 冲击前、后的残余应力

Figure 5. Residual stress before and after LSP

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