Hydraulic Iron Punching Press

A hydraulic punching machine is an example of a machine that works via liquid pressure. The machine consists of a piston inside a cylinder, with the piston connected to a ram. The ram pushes against a workpiece, forming a hole in it. The ram is actuated by hydraulic pressure, which is generated by a pump.punch press, machine that changes the size or shape of a piece of material, usually sheet metal, by applying pressure to a die in which the workpiece is held. The form and construction of the die determine the shape produced on the workpiece. Related Topics: press.