Select the die head according to the outer diameter of the pipe to be bent, set it on the plunger, and place the corresponding grooves of the two rollers toward the die head, and then put it into the hole of the flower plate of the corresponding size, and then cover the upper flower plate. Insert the bent pipe into the groove, then pull back the movable part of the quick joint at the end of the high-pressure oil pipe and set it on the joint of the working oil cylinder, and tighten the oil drain screw on the electric oil pump to bend the pipe. After bending the pipe, loosen the oil drain screw and the plunger will automatically reset.