It's called lights-out manufacturing:
"Factories that employ "lights-out manufacturing" are fully automated and require no human presence on-site."
"Factories that employ "lights-out manufacturing" are fully automated and require no human presence on-site."
"FANUC, a Japanese robotics company, has been operating as a lights-out factory since 2001.[6] Robots are building other robots at a rate of about 50 per 24-hour shift and can run unsupervised for as long as 30 days at a time."