摘要
近净成形叶片作为一种高效低成本的新型工艺方法,越来越广泛地被应用在航空发动机叶片毛坯制造上。航空发动机近净成形叶片其叶型复杂且属于薄壁类零件,无法保证所有区域一次成形且满足设计精度要求,需要对进/排气边区域进行自适应加工。自适应加工中进/排气边曲面通常为重构曲面,因为测量数据、缘头形状约束、毛坯变形等因素影响,重构曲面会出现曲率变化大、边界不齐等问题。针对上述问题,本文通过分析刀心轨迹与加工曲面几何关系,以光顺偏置曲面为基础,建立光顺刀心轨迹规划线规划算法,实现了重构曲面光顺刀心轨迹的高效自动化生成。在某型精锻叶片上进行了数控加工试验,试验结果显示进/排气边曲面轮廓公差控制在(-0.02~+0.039)mm范围内,满足图纸设计公差(-0.03~+0.05)mm的要求,证明了所提算法的有效性和实用性。
As an efficient and cost-effective new process method,near-net shape blade is increasingly being used in the manufacture of aero-engine blank.For aero-engine near net-shape blade,which is complex and thin-walled part,it is not possible to ensure that all areas are formed at once and meet the design accuracy requirements,and adaptive machining of the leading/trailing edge areas is required.The leading/trailing edge surfaces in adaptive machining are often reconstructed surfaces that have large curvature variations and uneven boundaries due to measurement data,leading/trailing edge areas shape constraint,blank deformation and other factors.To address the above problems,this paper analyses the geometric relationship between tool centre path and machined surface,and establish a planning line planning algorithm for the smooth tool centre path based on the smooth offset surface to achieve efficient automatic generation of smooth tool centre path for reconstructed surface.The experimental results show that the surface contour tolerance is controlled within the range of(-0.02~+0.039)mm to meet the requirement of the design tolerance(-0.03~+0.05)mm,which proves the effectiveness and practicality of the proposed method.
作者
郭一鸣
梁永收
李飞闯
任军学
GUO Yiming;LIANG Yongshou;LI Feichuang;REN Junxue(Key Laboratory of High Performance Manufacturing for Aero Engine,Ministry of Industry and Information Technology of Northwestern Polytechnical University,Xi’an 710072,China;Institute of Materials,China Academy of Engineering Physics,Jiangyou 621908,China)
出处
《航空制造技术》
CSCD
北大核心
2023年第17期110-119,共10页
Aeronautical Manufacturing Technology
基金
科技重大专项(2018ZX04019001)
国家自然科学基金(51905441)
中央高校基本科研业务费专项(31020200506002)
中国博士后科学基金(2018M633578)。
关键词
自适应加工
重构曲面
进/排气边
刀具路径
偏置曲面
残留高度
Adaptive machining
Reconstructing surface
Leading/trailing edge
Tool path
Offset surface
Residual height
