Internal-ribbed-tube forming device

The utility model relates to an internal-ribbed-tube forming device. One side of a mold holder (11) is concentrically sheathed with a reducing external mold (3); the other side is fastened with a liquid feeding spiral casing (10); the inner diameter of the spiral casing is provided with a rotatable impeller (9); the outlet of the impeller is connected with a connecting sleeve (6) through threads; a flow turning external mold (8) and a flow turning ball (7) are arranged in a cavity formed by the impeller and the connecting sleeve; a penetrating central is inserted into an embryonal tube (1); a rotatable reducing inner mold (2), a connecting rod (4) and a spiral inner mold tool (5) are arranged in the embryonal tube (1); the connecting sleeve (6) is connected with a hollow spindle of a drawing machine. Because of the reasonable structure of the utility model, the occurrence of the phenomena of the deformation, the tensile failure and the cracking of steel pipes is avoided; so, the quality of products is improved, cooling and lubrication can be forced, smoothness is improved, and length can be randomly drawn; the utility model has the advantages of compact structure, convenient operation, etc.