Mind Robotics, the startup founded by Rivian Chief Executive RJ Scaringe, raised an additional $400 million from investors on Wednesday, the latest bet on an AI-powered bot revolution in manufacturing. The startup has now raised more than $1 billion to pursue its plan to develop industrial robots for vehicle production and beyond. Mind Robotics, founded late last year, is teaming up with Rivian to train and deploy hundreds of smart robots in the carmaker’s factory in Normal, Ill., with the goal of eventually becoming a supplier to broader manufacturing sectors.