Clamp and method of processing semi-closed narrow intracavitary small hole based on clamp

The invention discloses a clamp and a method of processing a semi-closed narrow intracavitary small hole based on the clamp and belongs to the technical field of turbine blades of aero-engines. The clamp comprises a first positioning block, a fastening screw, a second positioning block, a third positioning block, a supporting plate and a bottom plate, wherein the supporting plate is mounted on thebottom plate, the first positioning block is hinged to the third positioning block, the third positioning block is mounted on the supporting plate, positioning grooves are formed in the third positioning block and the first positioning block, the second positioning block is connected to one side of the third positioning block, and the fastening screw penetrates through the first positioning blockand the third positioning block. Process parameters of the semi-closed narrow intracavitary small hole are obtained through tests, a processing program is compiled according to the process parameters, a blade tenon is mounted