Abstract:In the turning process of thin walled long axis aluminum alloy parts,deformation is easy to occur, the required size accuracy and roughness can not reached.In combination with the actual production of low pass filter cavity parts,the low pass filter cavity materials, structures, tools, cutting and cooling mode were analyzed,double circle tool, cavity special boring, thread forming turning tool were designed,reasonable processing parameters were chosen with kerosene as the cutting fluid.The tunning of the low pass filter cavity parts was completed.It has accumulated certain experience for similar thin-walled long-axis aluminum alloy parts. After a few years of mass production, the quality of the processed parts completely meets the design requirements, and the work efficiency is significantly improved.