Grede Foundries, which filed for Chapter 11 bankruptcy in June, said Thursday it will close its foundry in Wichita. The plant, at 805 E. Boston, will close in early spring 2010. A plant in Vassar, Mich., also will be shut down. The Wichita plant, which has about 90 employees, is the smallest of the Grede facilities, Grede chairman Richard Koenings said in a news release. The foundry's work will be moved to…