Extrusion International 6-2025

50 Extrusion International 6/2025 PIPE EXTRUSION may need to be modi ed slightly from the CONEXTRU standard. In order to carry out such a replace- ment, certain dimensions of the ex- isting extruder are required. In order to obtain these dimensions, it may be necessary, for example, to remove the cylinder from the gearbox. This can be done by the manufacturer in preparation. CONEXTRU then comes on site, takes the actual measure- ments of certain parts and uses them to create new production drawings. The production drawings are sent to the manufacturer of the screw and cylinder with details of the quality, i.e. standard or, as is usually the case, particularly high-quality wear Equipment Finally, a note about delivery times. Once the natural dimensions have been approved, the engineering is completed within a week and sent to the manufac- turer. Depending on the size, the entire assembly is then ready for collection in Vienna within 40 to 45 working days. This also applies if new heating and cooling units are required. As far as costs are concerned, a quote can be obtained within a few days without having to be on site. The measurements are taken in con- sultation with the customer after the order has been received. The following table lists the quali- ties that can be manufactured. Par- ticularly popular are bimetal cylin- ders with carbide inserts, grooved feeders made of H13 material and worms fully coated with tungsten carbide. This usually results in a sig- ni cantly better design than the original. Standard execution Screw 1/8509, screw ights with Colmonoy#56 Feedbush inner and outer part 1/8509, nitride Barrel 1/7225, Bimetallic liner 3mm Wear resistance execution Screw 1/8550, Quenching and tempering HB260~290 Surface treatment Tungsten carbide coating, at root and ight diameter on top of ight Feedbush outer part 1/8509, nitride Grooved Feedbush 1/2344, X40CrMoV5-1 - H13 - T20813, SDK 62 Barrel 1/7225, Bimetallic-liner 3 mm, Tungsten Carbide 25% Corrosion resistance execution Screw 1/4542, stainless steel hard able or as alternative 2/7819 Hastelloy; Nickel-Chrom-Molybdän- alloy with Wolfram, In case of processing temperatures over 300 °C, Feed section Colmonoy #56 coating Feedbush outer part Base steel: 1/8509, nitride Grooved Feedbush 1/2344 - X40CrMoV5-1 - H13 - T20813, SDK 62 As an alternative 2/4856 – INCONEL Barrel 1.7225, Liner 2/4856 Bimetallic-liner 3 mm, INCONEL Option to add 5 – 25% Tungsten carbide By Josef Dobrowsky Pic. 3: Manufacturing drawings for replacement set CONEXTRU Klosterstarsse 19, 3011 Irenental, Austria Dobrowsky.j@conextru.eu