Machining method for improving dimensional precision of connectors of hypersonic velocity wind tunnel nozzle

The invention discloses a machining method for improving the dimensional precision of connectors of a hypersonic velocity wind tunnel nozzle. The machining method includes the steps of machining preparation, coarse machining, reference surface finish machining, nozzle profile finish machining and cutting-off of straight sections. According to the machining method, the hypersonic velocity wind tunnel nozzle is machined section by section, the straight sections for improving the measuring precision are added to the sharp corner positions at the positions of the connectors of the sections, as thestraight sections are measured and machined at high precision, the dimensional precision of the sharp corners of the positions of the connectors is guaranteed, and finally the straight sections are removed. The machining method is suitable for controlling the dimensional precision of connectors when pipelines with curved lines, pipelines with inclined lines and workpieces with curved cavities andthe sizes of connectors n