The invention relates to the technical field of workpiece
machining, and discloses a
machining method of a thin-wall complex cavity. The method comprises the following steps that S1, a workpiece is split into multiple
layers according to an internal flow channel structure, and each layer becomes an independent cavity; S2, each cavity is split into a base plate and a cover plate, a runner groove isformed in each base plate, the cover plates matched with the runner grooves are machined, and chamfers are machined at the corners of the tops of the cover plates; S3, the cover plate and the base plate of each cavity are cleaned and polished and assembled, and
brazing filler metal is injected into
brazing seams along the chamfers of the cover plates; S4, each cavity is put into a vacuum furnacefor vacuum
brazing; S5, the surface of each cavity is subjected to finish
machining; S6, the cavities are cleaned and polished and assembled into a workpiece, and brazing
filler metal is injected intoweld joints; S7, the workpiece is put into the
vacuum furnace for vacuum brazing; and S8, finish machining is conducted on the workpiece after brazing. A thin-wall complex cavity workpiece is machined through the vacuum brazing method, simultaneous
welding of a plurality of independent complex cavities and overall
welding of the workpiece are achieved, and the requirements for the size and precision of the workpiece are met.