• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (9): 217-223.doi: 10.3901/JME.2019.09.217

• 制造工艺与装备 • 上一篇    下一篇

磨损轴面激光熔覆过程的数值模拟及试验

舒林森1,2, 王家胜1, 白海清1, 何雅娟1, 王波1   

  1. 1. 陕西理工大学机械工程学院 汉中 723001;
    2. 陕西理工大学陕西省工业自动化重点实验室 汉中 723001
  • 收稿日期:2018-01-05 修回日期:2018-09-13 出版日期:2019-05-05 发布日期:2019-05-05
  • 作者简介:舒林森,男,1982年出生,博士,讲师,硕士研究生导师。主要研究方向为再制造工艺、结构可靠性分析。E-mail:shulinsen19@163.com
  • 基金资助:
    国家自然科学基金(51505268)、陕西省教育厅专项科研计划(15JK 1142)和陕西理工大学人才启动基金(SLGKYQD2-26)资助项目。

Numerical and Experimental Investigation on Laser Cladding Treatment of Wear Shaft Surface

SHU Linsen1,2, WANG Jiashen1, BAI Haiqing1, HE Yajuan1, WANG Bo1   

  1. 1. School of Mechanical Engineering, Shanxi University of Technology, Hanzhong 723001;
    2. Shaanxi Key Laboratory of Industrial Automation, Shanxi University of Technology, Hanzhong 723001
  • Received:2018-01-05 Revised:2018-09-13 Online:2019-05-05 Published:2019-05-05

摘要: 为了避免激光熔覆过程产生微裂纹缺陷,对磨损轴面激光熔覆过程的热力耦合问题进行研究。根据磨损轴面激光熔覆试验建立其非线性瞬态分析数学模型,并引入有序网格离散算法进行轴面激光熔覆有限元建模,通过ANSYS参数化设计语言(APDL)和单元生死法编程实现金属粉末圆周堆积的瞬态热-力循环及其耦合问题求解,获得了熔覆过程的三维温度和热应力分布规律。结果表明,熔池的温度梯度较大且光斑中心靠后位置的温度最高(2 035.99℃),各节点瞬时温度衰变规律具有相似性和时间滞后性;热应力与温度梯度对应,冷却后的应力(约279 MPa)集中于热影响区(HAZ)且靠近覆层材料边沿侧,这与试验获得的激光熔覆残余应力基本吻合,可用于优化损伤轴面激光熔覆工艺及质量。

关键词: 激光熔覆, 热-力循环, 试验验证, 数值模拟, 轴面

Abstract: In order to avoid the microcrack defects, the thermal-mechanical coupling problem is analyzed adopting a numerical approach during the wear shaft surface laser cladding. The mathematical model of nonlinear transient analysis is established based on the wear surface laser cladding experiment, then an ordered discrete grid algorithm is using to realize three-dimensional finite element model of the shaft surface laser cladding process. The transient thermal- mechanical cycle and its coupling problem during multi-tracks cladding metal powder ring deposition process are solved by a developed subprogram with ANSYS parametric design language (APDL) and the finite element kill and birth technique. The distribution of temperature and thermal stress are obtained in the cladding process. Simulation results indicate that temperature gradients of the molten pool are larger and the highest temperature is 2035.99℃ which located in the adjacent area of spot center location. Transient temperature variations of the nodes on different cladding tracts are similar and arrive behind the load time. The cladding residual stress associated with temperature gradient and the peak residual stress(about 279 MPa)occurs in substrate metal adjacent heat affected zone (HAZ), which are in a good agreement with experimentally obtained results. The paper has a guiding significance to process optimization of the wear shaft surface laser cladding.

Key words: experiment verification, laser cladding, numerical simulation, shaft surface, thermal-mechanical cycle

中图分类号: