弹性磁力工具抛光钛合金叶片叶根

Polishing of Titanium Alloy Blade Root with Elastic Magnet-ic Tool

摘要:

针对钛合金叶片叶根区域铣削纹理难去除、抛光工具与工件易干涉等问题，提出弹性磁力小工具头抛光工艺，实现叶片叶根区域的光整加工。采用有限元软件 ANSYS Maxwell 仿真不同磁极极向排布对磁场分布状态的影响，比较了弹性和非弹性磁极载体对磁力小工具头抛光叶片叶根的效果；通过正交实验法优化了弹性磁力小工具头抛光叶片叶根的工艺参数。结果表明：与非弹性磁性抛光工具相比，采用聚氨酯作为磁极载体的弹性磁力工具可以有效提高被抛光工件的表面质量。采用最佳加工参数（主轴转速=900 r/min、进给速度=6 mm/min、加工间隙=1.5 mm以及磨料粒径=10~14 μm）对叶片进行抛光实验，叶片叶根处原有的铣削加工纹理被有效去除，表面粗糙度由抛光前的0.95 μm降至0.12 μm。验证了弹性磁力小工具头抛光工艺对实现高质量钛合金叶片叶根表面光整加工的可行性。

Abstract:

Removal of milling marks at the root fillet of titanium alloy blade is a tough work because of the interference between the polishing tool and the workpiece. A polishing method based on elastic magnetic tool was proposed. The software ANSYS Maxwell was used to simulate the effect of different pole orientation arrangements on the magnetic field distribution. A comparison of polishing effect was made between elastic and inelastic magnetic pole carriers. The processing parameters of the elastic magnetic tool polishing for the blade root were optimized by orthogonal experiment (Taguchi) method. Results show that compared with the inelastic magnetic polishing tool, the elastic magnetic polishing tool with polyurethane as the pole carrier can effectively improve the surface quality of the polished workpiece. Under the optimal processing parameters (rotational speed=900 r/min, feeding rate=6 mm/min, machining gap=1.5 mm and abrasive size=10?14 μm), the original milling marks at the blade root are effectively removed and the average surface roughness R_a is dropped from 0.95 μm to 0.12 μm, which verifies the feasibility of the elastic magnetic polishing tool in the surface finishing of the titanium alloy blade root.