Hot Extruded Device Carrier Profiles for Farm Machinery
A device carrier is the backbone of an agricultural implement, the beam that attachments clamp onto and that transfers every load back into the frame of the machine. It has to be stiff enough to hold tools in position across the working width and light enough not to penalise the tractor pulling it. For this project the section is a hollow profile of 80×70 mm in carbon steel S355J2, held to tolerances of 0.8 mm and produced by hot extrusion, supplied in bars of 6,300 mm that the customer then cuts to size.
From Two Welded Halves to a Single Seamless Section
In modern agriculture, machinery efficiency and durability are decisive for productivity and for the sustainability of the operation, since a lighter and stiffer implement covers more ground with less fuel and needs fewer repairs. As agricultural technology evolves, manufacturers look for materials that deliver optimal performance while withstanding harsh field conditions, and steel profiles are increasingly preferred in machinery construction for their strength. Historically, high demand meant that device carrier profiles were made by welding two halves together, a route that works but adds a joining operation, a heat affected zone and a source of dimensional variation on every bar. Recent advances in production equipment have simplified the process, improving both convenience and volume management for what remains an essential component, and this is exactly the kind of shift that special profiles enable across the industries Montanstahl serves.
Clamping, Tolerances and the Balance Between Strength and Weight
Designing a device carrier profile means creating a component that is durable and light at the same time, and the brief concentrated on three points. The first is the clamping effect, because the profile has to secure attachments firmly without adding bulk, which is why the cross-section carries concave recesses along its flanks that give the clamp a defined seat instead of relying on friction against a flat wall. The second is geometry and special sizes with tight tolerances, since a clamp that slides along the beam only works if the external dimensions stay constant along the whole bar, and the drawing here fixes the section within 0.8 mm together with a central bore of 58.4 mm and radii specified individually around the perimeter. The third is the trade-off between efficiency and lightness, where every millimetre of wall thickness added for stiffness returns as mass the machine has to carry through the field for its entire service life.
Application Context
The geometry was engineered so that the profile can be welded directly to the machinery, while the combination of S355J2 carbon steel and a hollow cross-section delivers strength and lightness in the same part. The profiles measure 80×70 mm with tolerances of 0.8 mm, are supplied in bars of 6,300 mm and are cut to size by the customer, which keeps the offcut where the assembly line can plan for it. Hot extrusion suits this component because it produces seamless hollow sections with undercuts and recesses in a single pass, with no minimum quantity and low tooling cost, as set out in our guide to steel and stainless steel hot extrusion. Montanstahl produces special profiles to customer drawings in carbon steel, stainless steel and alloy grades for agricultural machinery, material handling and mechanical engineering, and questions on dimensional limits and tolerances are answered in the technical Q&A.