The expansion addresses increasing demand for machined iron castings, including cleaning and finishing, from the automotive, commercial-vehicle and other industries. Waupaca Foundry will expand into Michigan’s Upper Peninsula to process iron castings produced at its Waupaca, WI, plants. The company says it will invest $4.3 million in an existing 50,000-sq.-ft. (4,645-sq.-m) facility in Ironwood, MI,…