Troester automates system to deliver consistent wall thickness in hoses

ERJ staff report (DS)

Nuremberg, Germany -- Troester has introduced a system which can automatically centre the hose bore and hose outer to an accuracy of around 10 microns over a complete production run. The company launched the unit at the IRC show in Nuremberg last week.

The main innovation of the new system is a cross head optimised for the hose production. The head is provided with a conventional manual die piece adjustment by screws in the front area and additionally allows for a very sensitive swivelling of the inner tools (mandrel tip, extrusion mandrel) by means of a hydraulic drive.

Unlike more conventional systems where the die piece needs high forces to move it, the new design allows the mandrel tip to be positioned in radial direction relatively smoothly and with high precision. The hydraulic drive is positioned on the rear side of the head, away from the compound output. This permits safe mechanical functioning of the adjusting unit, even in the harsh daily production environment.

For the hose production the use of the new head system is particularly advantageous in combination with a downstream profile measuring system. The wall thickness, continuously measured online, is transmitted to a digital controller which adjusts the eccentricity of the hose automatically in a continuous feedback loop, with a short time-constant which delivers impressive accuracy. In combination with an X-ray measuring device of type Sikora X-Ray 2000 it was possible under all tested production conditions to achieve an eccentricity per axis of below one hundredth of a millimetre and to maintain this value over the whole period of production.

This is an external link and should open in a new window. If the window does not appear, please check your pop-up blocking software. ERJ is not responsible for the content of external sites.

Press release from Troester