metal caster; foundry worker
Refers to a person who casts metal, typically in a foundry setting. A somewhat specialized term; in everyday contexts, 鋳物師 (いものし) or 鋳造工 (ちゅうぞうこう) may be more common.
He has been working as a metal caster, casting iron, for many years.
Compound of 鋳 (ちゅう, 'casting') and 工 (こう, 'worker' or 'artisan').