Method for producing polygonal cross-section hollow body and polygonal cross-section hollow body

摘要

PPROBLEM TO BE SOLVED: To provide a method for manufacturing a hollow body of polygonal section and its product used for manufacturing apparatus for semi-conductor, liquid crystal, etc., with which the working time can be shortened, the corner-shaping in a corner part can be formed while reducing the excessive thickness, and the further larger product and the larger product into a prescribed size in the same press facility can be manufactured by utilizing the extension of side part to the excessive thickness. PSOLUTION: In the method for manufacturing the hollow body of polygonal section, performing the enlargement of diameter and the formation with the press for forging, A flat plate-shaped upper anvil at the outside of a hollow blank, and a flat-shaped lower anvil at the inside thereof, are used and the hollow body of polygonal section is produced by performing the formations of the side part and the corner part. PCOPYRIGHT: (C)2006,JPO&NCIPI