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Upsetters are typically used to increase the diameter of a workpiece by compressing it
longitudinally. The process is used for a wide range of parts and components. These include engine
valves, drive shafts, engine components, bolts, screws and other fasteners.
The initial workpiece typically has diameters between 2.5 cm (1”) and 25 cm (10”) and the upsetting
force can be up to 2000 t. In most upsetters split dies with multiple cavities are utilised. In between
the individual forging cycles the dies open enough to allow the workpiece to pass from one cavity to the
next before closing again for the next forging stage. The ram then pushes along the axis of the
workpiece, deforming (upsetting) it into the die cavity.
If all cavities of the die are utilised then a finished part is produced at the end of every cycle,
making the process ideally suited to high-volume parts.
PRESSTRADE stocks second-hand upsetters from manufacturers including Ajax, Eumuco, Etchells, Hasenclever,
Kieserling, Krematorsk and National.
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