The Designation Method of Bend Forming Dies for Aluminum Tube of PE-Al-PE Composite Pipe

摘要

In this paper, the designation of bending dies and forming dies that are used in producing technologicalrnprocess of PE-Al-PE pipe is put forward. The process starts from a coil of Al belt, in the action of pulling force,rnpasses between several bending dies to change its shape. The first step is to change Al belt to U shape.rnConsidering of the factors such as spring of the bend Al belt, frictional force between Al and the die, bendingrnforce needed to bend Al belt, etc., it must be shaped gradually into U by several dies. The designation of theserndies has been given in this paper. The next step is to forming the U shape into a circle. The U shape Al belt goesrnthrough a round that is formed with a four-roller die, and then is shaped to a circle. The calculation andrndesignation of the rollers of this four-roller die has also been given.