A METHOD OF PRODUCING THIN WALLED METAL TUBES WITH THICKENED ENDS

摘要

A method of producing thin wall metal tube with thickened ends is provided. The method comprises holding a thin wall metal tube (T) of desired length within the jaws (J) of a clamp and introducing two punches (P) having a step configuration (A, B) from both ends (E) of the tube (T). Pressure is applied from both ends so that the stepped portion (B) of the punches (P) buckle the end zones (Z 1) of the thin wall metal tube (T) and allow the flow of metal to thicken the end zones (Z 1) at both ends of the tube (T). The punches (P) are removed from the ends (E) and the jaws (J) are released to obtain a thin wall metal tube with thickened ends.