The role of first belling machine working in the module is expanding oral module to the location of the maximum radial movement to the minimum position of mobile, namely rise out of position to the indentation location of radial displacement, because the machinery is composed of two modules, displacement is not the same as in the work, so the work is divided into two modules.

Modules in different positions have different requirements:

One, the largest location: in the largest position, which requires optimum size module, its outer contour shape should be consistent with the expanding forming the shape of the mouth.

2, minimum location: in the minimum position all modules within the circumference of the inside diameter of the pipe, to ensure that have been flaring shaped pipe smoothly from verbally exit.

Three, between the maximum and minimum location: between the maximum and minimum position module in motion, in order to ensure the smooth motion, adjacent modules may not be where the intervention, the two modules in sports should be in a state of separation. In the following figure, we can see in the largest position, small module is part of the overlap in the module below, by the biggest to the smallest location moves, big module on the outer edge of the small module, therefore, should first make big module satisfies the requirement of its location at the smallest position, the position of the small module along with the position of big modules, so you can determine the position of the modules of conditions.

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