A
helical tube hot-
extrusion die in porous
magnesium alloy belongs to the technical field of die
processing. The
helical tube hot-
extrusion die comprises an upper die, a middle die and a lower die, wherein, the upper die, the middle die and the lower die are sequentially sheathed and are of disk structures, and rabbets, locating pins and bolts are respectively arranged between the upper die and the middle die as well as between the middle die and the lower die for fixation. A
helical flow supply mode is adopted for the upper die of the helical tube hot-
extrusion die, which significantly lowers resistance formed by helical shaping of tube blank by special helical equipment when a tubular product is extruded; and a circular
welding cavity is adopted for the lower die, which is beneficial for rotary
welding of a
magnesium alloy material of plastic flow in the
welding cavity. Meanwhile, dimensional accuracy of a
metal is ensured under the action of a forming cavity working tape when the
metal is extruded out of the welding cavity, and the die structure has good symmetry, thus reducing non-uniformity of feed stock flow, and avoiding
cracking of tube walls when a helical aperture is formed on the
magnesium alloy material. The helical tube hot-extrusion die has the advantages of high preparation and production efficiency, few waste materials, good quality and being more favorable for meeting the requirements of
continuous production.