What is a preform in metalworking?
A preform is a roughly shaped piece of metal that has been partially worked but not yet brought to final dimensions. It is an intermediate step between raw stock and a finished part.
Related Terms
Billet
A billet is a solid block or bar of metal — usually square or round — cut from rolled or cast stock, used as input material for forging, extrusion, or heavy machining.
Metal Blank
A metal blank is a flat piece of metal cut to a specific size or shape, ready to be formed, stamped, machined, or processed further. It's the starting material before a part is finished.
Near-Net Shape(NNS)
A near-net shape is a blank or preform cut or cast very close to its final dimensions, minimizing the amount of machining or material removal needed to finish the part.
Deep Drawing
Deep drawing is a forming process where a flat metal blank is pressed into a die to create a cup, box, or shell shape. Used to make cans, pots, automotive panels, and enclosures.