End-forming is the process of changing the shape of the end of a tube or bar through axial forming forces, resulting in a change in the length of the workpiece. Various shape changes can be obtained such as reducing, expanding, beading, flanging, coining, flaring and trimming.
The animation shows the principle of operation of the straight in-line vaill end-forming machine. The part is held in place by a clamp block while the dies are pushed in or over the workpiece in order to form its end. The forming length is determined by the stroke of the cylinders displacing the dies (pneumatic for smaller machines and hydraulic for the bigger ones) and the position of the workpiece in the clamp block.
Since no rotation is involved, non-symmetrical and other sophisticated shapes can be obtained with this method. This process can simultaneously form inside and outside if the piece is tubular.
Torrington end-forming machines are specially designed and recognized for their productivity, making them a highly profitable asset. Production rates can reach up to 1500 parts per hour, depending on the complexity of the shape and the number of strokes required. End-forming machines can be equipped with up to 4 punches, either mounted on a rotational head or on a horizontal tool holder. An indexing mechanism then allows several operations to be performed without releasing the part from the clamp block.
In order to accomodate feeding and ejection of special parts, Vaill end-forming machines are offered with two different clamp versions:
- Horizontal opening clamp machines
- Vertical opening clamp machines
Here are the standard models of vaill end-forming machines
The following parts are only a few examples of what can be made with a vaill: