Forging
Screw Press |
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| The scope of the screw press forging is confined to shapes that do not require breakdown operations, or such as have been forged so as to fit the dies. The forging is completed in one stroke or squeeze of the screw. With friction drives there is little danger of jamming the press from an increase in thickness of the flash. These presses do not require any special foundation, as there is no jar or shock in their operation. They make strokes from 10 to 40 per minute and exert pressures from 25 to 1,800 tons. |  |
| The screw press may be used for a great
variety of hot or cold metal forgings. Besides open die forgings, metals
may be extruded through dies, squirted up around the punch or formed
in enclosed dies. |
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| 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. | |
