MANUFACTURING METHOD OF LENGTHY OBJECT HAVING THICKNESS VARIATION

摘要

PURPOSE:To offer a method of manufacturing a lengthy object having thickness variation capable of being enlarged. CONSTITUTION:Thick walls of the upper part of the leg part 31 of an upper side area 30, a head part 32a, bending piece 33a and a joining piece 34 are extruded thinner than that in the right and left area 10. Accordingly, and sectional area of the shaped space of a extrusion head can be increased and decreased by means of moving a slide core 62, having tapered surface 62a on its tip, back and forth.