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A model test runner lower ring five-axis machining clamp belongs to the field of water turbines, in order to solve the existing model runner lower ring clamping device exists for a long time, the problem of low clamping efficiency, the application includes positioning bolt, cross hollow pressing plate, circular ring pressing plate and center support frame, the center support frame is installed on the top of the workbench, the cross hollow pressing plate and the circular ring pressing plate are sequentially arranged from top to bottom above the center support frame, and the cross hollow pressing plate, the circular ring pressing plate and the center support frame are coaxially arranged, the threaded end of the positioning bolt is sequentially threaded through the cross hollow pressing plate and the circular ring pressing plate and is threadedly connected with the center support frame, the bolt head of the positioning bolt extends above the cross hollow pressing plate, the model test runner lower ring is arranged on the center support frame, and the model test runner lower ring is clamped between the circular ring pressing plate and the center support frame by rotating the positioning bolt to apply clamping force, and the application is used as a model test runner lower ring five-axis machining clamp.