OVAL CROSS SECTION METAL TUBE PRODUCING DEVICE AND PRODUCING METHOD

摘要

It is intended to attain the widening of the range of applications and the enhancement of added value of metal tubes, etc., by obtaining an aluminum tube of oval cross section that has never existed before. To this end, a disk-like metal slag (21) is impact-extruded by a structurally optimum-designed mold (13, 14) to thereby mold a metal tube (T) having a mouth, shoulder and oval cross section barrel formed integral. And the skirt of the oval cross section barrel of the molded tube (T) is once shaped into a perfect circle by utilizing the principle of work hardening of metal and then it is subjected to trimming by lathing.