摘要
为了快速、准确地提取零件破损边界,直观地反映零件损伤的过程和结果并进行形状还原,更好地实现激光熔覆再制造修复复杂破损零件,依据激光熔覆的工艺特点对破损零件的缺陷类型进行划分,并对不同类型缺陷进行破损边界提取和形状还原方法的研究。提出基于曲率阈值和法矢夹角阈值的表面浅斑类损伤边界特征以及基于3-D比较的局部深层类损伤边界特征进行提取的方法,采用NURBS曲面对表面浅斑类损伤零件和传统曲面造型方法对局部深层类损伤零件进行形状还原,最后路径规划进行激光熔覆再制造修复实验验证。结果表明,此方法提高了其破损区域提取和还原的精度和效率,熔覆形貌波纹度较小。该研究为零件破损边界提取与形状还原在激光熔覆再制造的应用提供了理论基础。
In order to extract the damage boundary of parts quickly and accurately, observe the process and results of parts damage and realize the shape reduction, and repair complex damaged parts by laser cladding remanufacturing, the defect types of the damaged parts were divided according to process characteristics of laser cladding, the damage boundary extraction and shape reduction methods of different types of defects were studied.The method of extracting boundary features of surface spots based on the curvature threshold and the normal vector threshold and the method of extracting boundary features of local deep damage based on 3-D comparison were proposed.The methods of shape reduction were presented, for the local deep damage parts by the traditional surface and for the superficial damage parts by the NURBS surface.And then, the experiments of laser cladding remanufacturing and restoration were carried out to verify the feasibility of the proposed method by path planning.The results show that the precision and efficiency of the extraction and restoration of the damaged area are improved and the cladding morphology waviness is smaller.The study provides the theoretical basis for the application of extraction and shape reduction of the damaged parts in laser cladding remanufacturing.
出处
《激光技术》
CAS
CSCD
北大核心
2017年第5期675-679,共5页
Laser Technology
基金
新疆大学博士启动资金资助项目(112-61180)
新疆高技术研究发展基金资助项目(201513102)
新疆维族自治区公共技术服务体系建设基金资助项目(2015531096)
关键词
激光技术
边界提取
形状还原
激光熔覆
路径规划
laser technique
boundary extraction
shape reduction
laser cladding
path planning
