Tutorial: Engineering technology Topic: Forming Mills Prepared by: Ing. Elena Nová Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
Most important forming mills: Rolling mills Presses Bending machines
Rolling mill Two-rolled, three-rolled, universal Using: Sheet manufacturing Profile bars(I, U, rails) Wires
Presses Presses are divided according to purpose: Forming Forging According to drive: Mechanical presses Hydraulic presses
Hydraulic press Usage Big forgings from ingots Deep drawing Hot extrusion Stamping Cold extrusion Usually vertical Two pillars Four pillars (more often) Small presses: Single plunge Bigger presses: Three plunge with ability to engage individual plungers -> increase of pressure
Forging press - spring power hammer Usage: Forging die Free forging Propulsion: From electromotor through friction transmission to flywheel From crankshaft by mechanical levers to a ram Ram speed (ram blow) is increased due to upper two arm lever is made from pack of spring-leaves
Forging rolls Usage: Precision forgings Pre-forging of products with variable profiles Not working continuously, but with jumps Cylinders are placed on stands turning against each other, calibrated only on one half of circumference