Grede, a developer, manufacturer, assembler and supplier of ductile, gray and specialty iron castings and machined components for automotive, commercial-vehicle and industrial markets, announces it has purchased a Waukesha, WI, foundry from Renaissance Manufacturing Group (RMG) Waukesha. Terms of the transaction were not disclosed. The foundry located 10 miles (16 km) west of Milwaukee will close July 31…