The invention relates to the technical field of aero-engine part
machining, in particular to a
machining method of an aero-engine
titanium alloy special-shaped part, which comprises the following steps: step S1, manufacturing a blank, dividing the blank into two symmetrical parts along a
long axis according to the
titanium alloy special-shaped part, unfolding the two symmetrical parts, performing single-side margin-reserved blanking, and performing
rounding to obtain a blank before hot forming; s2,
coating a protective
coating, namely brushing
boron nitride protective paint on two surfaces of the blank, brushing
boron nitride protective paint on a forming male die and a forming female die of the die, and naturally
drying at normal temperature; s3, hot forming is conducted, specifically, a mold is heated to a set value along with equipment, the blank is put into the mold to be subjected to hot forming, a semi-finished product blank which is separated along the
long axis and provided with reinforcing ribs is obtained, and the profile and size precision of the semi-finished product blank are guaranteed; s4, the protective
coating is cleaned,
boron nitride on the surface of the semi-finished blank is wiped with a scouring pad in clear water, and no
stain is left; s5, the appearance is
cut, the part is positioned and aligned through reinforcing ribs, the semi-finished product blank is
cut, and a halved part is obtained; s6, removing an
oxide layer; and S7, the two halved parts are welded through
laser welding, and the complete
titanium alloy special-shaped part is obtained.