Preparation process of aluminum alloy backward extrusion pipe

The invention discloses a preparation process of an aluminum alloy backward extrusion pipe, which comprises the following steps: S1, obtaining a blank, and putting the blank into an extrusion container; s2, an extrusion rod, an extension rod and a working belt are assembled; s3, the upper die plate is controlled to move in the direction of the extrusion cylinder, and after the upper die plate is pressed downwards by a target distance, the first connecting piece is disassembled; s4, the upper die plate is controlled to continue to move till the length of the blank is the target length, and a forge piece is obtained; s5, the upper die plate is controlled to move in the direction away from the extrusion cylinder, and the extrusion rod is separated from the forge piece; and S6, the forge piece is taken out of the extrusion container, and the extension rod and the working belt fall off from the bottom of the forge piece. According to the preparation process provided by the invention, the machining requirement of t