The invention discloses a
cutting tool with high durability, and relates to the technical field of
cutting tools. The
tool bit comprises an upper
tool bit body, a lower
tool bit body, a
butt joint pin, a positioning rod and a transverse pin
pipe, a
butt joint groove is formed in the lower end of the upper tool bit body, the
butt joint pin is arranged at the upper end of the lower tool bit body, a
stroke hole is formed in the upper tool bit body, a positioning hole is formed in the butt joint pin, and the positioning rod is slidably inserted into the
stroke hole; an inserting hole is formed in the upper end of the positioning rod, a transverse pin
pipe is slidably inserted into the inserting hole, a first spring is arranged on the inner wall of the transverse pin
pipe, a mounting block is arranged at one end of the first spring, and a pull
handle is arranged at the upper end of the transverse pin pipe. By arranging the upper and lower split tool bits with gradually increased radiuses and the inverted splayed positioning structure and matching with the elastic limiting and convenient dismounting mechanism, stepped step-by-step
cutting is realized, and the problems that a traditional tool is concentrated in cutting stress, quick in abrasion, high in maintenance cost and needs to be integrally replaced when the tool bits are damaged are solved.