How to measure wire and cable diameter ?

What interests us here is the use of a measuring instrument installed on a production line for continuous measurement. Manufacturers wish to obtain live information on the geometry and possible defects of the manufactured product in order to adjust at the earliest possible stage of the process. This, in order to reduce material waste to a minimum and improve the overall quality of their production.

In another article, we explain how to use a measuring device to measure diameter and ovality off-line.

Cable, tube diameter measuring tool

Depending on the type of process (extrusion or fine wire drawing) and the type of product manufactured (wire, cable, tube), it may be necessary to install several devices on the production line. At the end of the process or between each step of a process to control many parameters. Of course, there are a large number of measuring instruments available for this purpose. In this article, we limit ourselves to checking the diameter, ovality and detecting geometrical defects of the coating.

In a harsh production environment (dust, water splashes, fumes), it is important to have equipment capable of withstanding these stresses. Wire or cable vibrations are also a major difficulty for measuring instruments. The last important point to take into account in the choice of the device for on-line measurement and its acquisition speed. Indeed, in order to detect defects on production lines that are going faster to increase productivity, it is important to install a very fast device.

Several axis laser micrometer

Depending on the size (diameter) of the wire, cable or tube to be measured, and the type of measurement (diameter alone and/or geometrical defects), CERSA offers several dedicated devices :

The LDS range is rather dedicated to the measurement of fine and very fine wires (5 to 2000µm) obtained by the wire drawing process :

·       The 1-axis version measures the diameter very accurately in one direction only. In this case, it is difficult to effectively calculate the ovality of the produced wire. However, it allows to check regularly and indirectly the wear of the die without having to stop the production and check its geometrical characteristics off-line. Often used by manufacturers for drawing dies control by measuring the drawn wires.