基于离散数据的汽轮机叶片荒加工的研究  

Research of a Turbine Blade Hogging Based on Scattered Data

作　　者：马骊溟[1] 姜虹[1] 王小椿[1] 

机构地区：[1]西安交通大学机械学院,西安710049

出　　处：《汽轮机技术》2004年第6期477-480,共4页Turbine Technology

摘　　要：汽轮机叶片毛坯在铸造过程中变形严重,导致粗加工时余量分布极不均匀,提出了一种新的毛坯荒加工算法。该算法能直接从测量数据中生成荒加工刀位轨迹。首先将待加工曲面按照参数线进行网格划分成曲面片,然后采用投影的方法确定每个网格内的曲面片是否为可加工,并将这些可加工网格内的曲面片连接,从而获得荒加工区域。本算法剔除一般粗加工中无用的走刀路径,大大提高了复杂曲面类毛坯数控加工的效率。此算法避免了根据测量的离散数据点进行自由曲面造型,并通过曲面求交来获得荒加工区域。该算法已经应用于某汽轮机叶片的荒加工仿真,结果表明,该算法不仅效率高,而且结果非常理想。Aiming at two shortages during rough working stock of turbine blade is distorted significantly and cutting stocks are distributed very dispersedly, a new hogging algorithm is proposed. It generates tool paths for hogging machining directly from measured data. Firstly, machining surface is divided into patches which are surrounded by mesh along parameter curves. And projection method is used to determine whether every patch can be machined. Then the patches is linked, so all the hogging cut areas were determined. This algorithm eliminates useless tool paths in usual rough machining, so it can increase the machining efficiency. It avoids the problems of surface modeling from measured scattered points and intersecting with blank's surface and the part's offset surface, so the algorithm is simple. This method has been used for the hog simulation of turbine blades, it is proved that the algorithm is very efficient and the final result is excellent.

关 键 词：荒加工 毛坯 自由曲面 

分 类 号：TP391.72[自动化与计算机技术—计算机应用技术]