Metal Gathering Machine/Upsetting Machine
What is Electrical Upsetting?
A high current is passed into one portion of the material to be upset. Due to the material resistance, heat is created. Once this portion of the material reaches a plastic state, cold material is pushed into the hot area via hydraulic force. During 'open' electrical upsetting, the bar material is positioned between the upsetting cylinder and the anvil plate or die. Two-part clamping jaws close around the bar and electrical current
flows between the clamping jaws and anvil plate, heating the exposed portion of the component. The hydraulic cylinder exerts a controlled force on the cold end of the bar producing a shaped head. The material is upset to the required shape via the application of heat, pressure, flow, and linear travel. In 'open' upsetting techniques the component is then passed to a form tool [press] in the red hot state to finish. 'Closed' techniques produce a finished component direct from the upseting machine.
The upsetting axis is usually vertical and the stroke is hydraulically powered. The machines incorporate many features that ensure optimum cycle time, excellent repeatability, quick set-up and reliable operation for all types and sizes of valves.