Which process typically involves dies compressing heated metal to shape parts?

Which process typically involves dies compressing heated metal to shape parts?

• A. Machine forging
• B. Cold forging
• C. Extrusion
• D. Casting

Answer: (A)

Shaping metal by pressing it between dies while it is heated is forging, performed with a machine that applies the compressive force. Heating the metal makes it softer and more workable, allowing the dies to form the desired shape without cracking, while aligning the grains for better strength. This combination of dies and compression on heated metal is the hallmark of machine forging, or hot forging, in contrast to other methods. Cold forging uses dies and compression too but at room temperature, so it doesn’t involve heating. Extrusion pushes metal through a die to create a cross-section but not a final closed shape by die compression. Casting involves melting and pouring into a mold, not compressive shaping with dies.

Shaping metal by pressing it between dies while it is heated is forging, performed with a machine that applies the compressive force. Heating the metal makes it softer and more workable, allowing the dies to form the desired shape without cracking, while aligning the grains for better strength. This combination of dies and compression on heated metal is the hallmark of machine forging, or hot forging, in contrast to other methods.

Cold forging uses dies and compression too but at room temperature, so it doesn’t involve heating. Extrusion pushes metal through a die to create a cross-section but not a final closed shape by die compression. Casting involves melting and pouring into a mold, not compressive shaping with dies.