磁力研磨工艺对整体叶盘表面完整性的影响

Influence of Magnetic Abrasive Finishing Technology on Surface Integrity of Vane-integrated Disk

针对铣削加工对整体叶盘零件表面完整性控制不能满足使用要求的难题,利用磁力研磨所特有的柔性、自适应性、可控性等优点,研发了一种基于机器人的自由曲面磁力研磨装置,对整体叶盘零件进行加工试验。试验结果表明:经过磁力研磨后零件的表面粗糙度数值大幅度降低;铣削加工残留下来的加工纹理基本去除;原始表面上的微裂纹减弱或彻底消除;近表层原始显微组织中的变质层被部分去除;残余应力也明显减小。由此表明磁力研磨加工工艺能够提高整体叶盘的表面完整性,从而可以提高零件的疲劳强度和使用寿命。

To solve the problem that the surface integrity control of vane-integrated disk in the milling process does not satisfy the working requirements,a free-form surface magnetic abrasive finishing equipment based on robot manipulator was developed to perform the vane-integrated disk experiment which has the advantages of flexibility,adaptability,controllability,and so on.The results show that after magnetic abrasive finishing,the surface roughness value is significantly reduced,the milling machining leave of processing texture is removed,the original surface micro-crack decreases or is thoroughly eliminated,the original microstructure of near surface damaged layer is partly removed,and the residual stress value is obviously reduced.From above all,it is indicated that the magnetic grinding processing can improve the surface integrity of the vane-integrated disk,and the fatigue strength and service life of work piece are improved.