The utility model discloses a expanding tool used for manufacturing and maintaining various containers, which is used to expand the inner and outer diameters of the pipe, make the pipe and the pipe plate touch the parts tightly, do not leak water, leak air, and can bear a certain pressure. Widely used in refrigeration, petrochemical, power, shipbuilding, metallurgy and other industries of condensers, coolers, heat exchangers, boilers and other pressure vessels manufacturing and maintenance. Copper, aluminum, titanium, iron, stainless steel and other materials can be expanded. It is mainly composed of expansion shell (retainer), expanded bead (Gun Zhu), expansion rod (mandrel) three components. The expanded bead and expansion rod are made of Gcr15 bearing steel. The expanded shell adopts 45# medium carbon steel by the heat treatment process to improve the hardness (HRC55 degrees to 60 degrees) and toughness. Eight trapezoid chute opening shell, can prevent the expansion of the Pearl off work, the expander placement by expansion pipe (shell into about 2/3), push the expansion rod, clockwise expanding rod (bulk expansion pipe by pipe expanding machine as the power source), the expansion rod drives the expansion beads. Then drive the expanding bead shell, the rotation angle between shell and tube chute driven expansion rod propulsion while rotating along the tube axis; with the expanding rod with taper gradually, by internal hole and external diameter of expansion pipe is gradually expanding, combine it with tube plate connected to reach
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