Machining method for improving performance of fractured clamp

The invention relates to the technical field of expansion fracture clamp machining, in particular to a machining method for improving the performance of an expansion fracture clamp. According to the technical scheme, the method comprises the following steps that semi-finish machining is carried out, specifically, a multi-axis linkage numerical control machine tool is adopted for machining an expansion fracture clamp, the diameter of a cutter is selected to be 0.5-1 mm, the cutting speed is selected to be 50-100 m/min, the flow and pressure of cooling liquid are increased, and heat accumulation is reduced; the cracking groove is machined, specifically, the cracking groove is machined through laser, and the depth ranges from 0.5 mm to 1 mm; heat treatment is conducted, specifically, the clamp is placed in a vacuum heat treatment furnace, vacuum heat treatment is adopted, the clamp is heated to 1000-1100 DEG C, and the internal structure of the clamp is converted into austenite; and quenching, wherein the machin