The invention discloses an axial layered
cutting method for turning coarse-
pitch threads, a
tool wear testing method and a force-
heat load calculating method of
tool wear for eliminating principle errors caused by radial layered
cutting of the coarse-
pitch threads. The axial layered
cutting method for turning the coarse-
pitch threads, the
tool wear testing method and the force-
heat load calculating method of tool wear are technically characterized in that through the cutting method, a testing tool with a left cutting edge and a right cutting edge is used for axially turning a left thread surface and a right thread surface of a coarse-pitch test piece in a layered mode, wear tests of the tool turning the coarse-pitch threads are conducted through the cutting method, the
wear pattern of the tool turning the coarse-pitch threads is obtained, the influence of tool wear on thread
machining surfaces is revealed, then a finite element analytical model of the tool is reconstructed according to the flank wear data of the tool and the blunt round
radius measurement data of the cutting edges, analysis and calculation of the temperature field and the
stress field of the tool are carried out, and the force-
heat load change characteristic on the tool wear condition is obtained.