Lubrication-free expanding type full circle mold

The invention discloses a lubrication-free expanding type full circle mold. The lubrication-free expanding type full circle mold comprises a main body mechanism and an executing mechanism, wherein themain body mechanism at least comprises a mold body, an expanding sleeve and a pull rod; the mold body, the expanding sleeve and the pull rod are arranged in a nested mode from outside to inside, wherein the expanding sleeve has a property of expansion due to compression and recovery due to the disappearance of compression, and the mold body has the capacity to expand outward when driven by the expansion of the expanding sleeve; one end of the pull rod is provided with a limiting structure, so that the expanding sleeve can be pressed to expand under an external force; and the executing mechanism drives and controls the other end of the pull rod. According to the technical scheme, a lubricant-free mode in shell machining of a low-power motor is realized, the machining efficiency is remarkably improved and the machi