It is well known that rolled elements can have length variations of up to 2%, depending on the filling process. Correcting these length differences allows for proper distribution of dimensional tolerances across the heating elements and supports a smoother production process. The most common solutions for length compensation are stretching machines and roll-to-length machines.

The roll-to-length machine is ideal for high volumes and is placed inline with the rolling mill. The length of each element is precisely measured as it exits the roll reducer, and the elements are then elongated in the roll-to-length machine to the preset length. Elongation is achieved by further reducing the diameter of the elements. This solution is limited to a specific diameter and requires no heat treatment.

The advantages of the roll-to-length machine are: a continuous length-control process that eliminates secondary operations, and no heat treatment of the heating elements is required.

The stretch-to-length machine can handle both large and medium production batches. It is a multi-diameter solution designed to process heat-treated elements and requires minimal maintenance.

The advantages of the stretching machine are: simple construction, the option to add automation at any time, minimal maintenance requirements, multi-diameter capability, and the ability to incorporate pin cropping directly into the machine.

Oakley Industrial Machinery is here to help you find the best solution for your needs.