Positioning tool for machining of axial flow fan mesh enclosure

The positioning tool for machining the axial flow fan mesh enclosure comprises a horizontal fixing bottom plate, a horizontal containing plate is fixed to the middle of the top face of the horizontal fixing bottom plate, and a middle protruding part extending upwards is formed in the middle of the top face of the horizontal containing plate; a mesh enclosure bottom frame to be welded is placed on the top surface of the horizontal placing plate; the middle of the mesh enclosure bottom frame is an annular body, the middle protruding part is inserted into the annular body in a sleeved mode, a plurality of positioning columns are fixed to the left portion and the right portion of the top face of the horizontal containing plate, a limiting gap is formed between every two adjacent positioning columns, and a plurality of circular rings to be welded are placed on the top face of the mesh enclosure bottom frame. Part of the circular rings are located in the two corresponding limiting gaps. According to the welding dev