The invention discloses a grenade bottom-row
stern screwing device and a using method. The grenade bottom-row
stern screwing device comprises handles, a frame body, an oblique block, a retaining frame, M6*16 screws, an upper end cover, cone rolling columns, a lower end cover and M6*10 screws. When the device is used, the lower end cover faces downwards to enable a
wrench to sleeve on the externalconical surface of a bottom-row
stern, and the handles which are symmetrically welded to the external
circular surface of the frame body is manually used, so that the cone rolling columns rotate alongthe axial line of the bottom-row stern in the frame body; meanwhile, the cone rolling columns move in the axial direction of the bottom-row stern under the action of the oblique block, the
conical surface of each cone rolling column is clamped on the external
conical surface of the bottom-row stern in a fastened manner, and the bottom-row stern is driven to be screwed together with a
projectile assembly; and the force moment set on the mechanical
torque wrench is exerted on the bottom-row stern, so that it is guaranteed that the screwing force of the bottom-row stern and the
projectile assembly meets the requirement of a set value. According to the grenade bottom-row stern screwing device and the using method, screwing of the bottom-row stern and the
projectile assembly under the action of the force moment can be achieved, the screwing efficiency of the bottom-row stern is improved, and the accuracy and reliability of screwing of the bottom-row stern are guaranteed.