PRODUCTION OF NON-CIRCULAR PIPE FOR VINYL HOUSE HAVING ENHANCED DEFORMATION RESISTANCE AND INCREASED LOAD CAPACITY BY ADJOINING METAL PLATE AND FORMING RECESSED GROOVE ON OBTAINED METAL PIPE BY PRESSING

摘要

PURPOSE: A method of making a non-circular pipe by adjoining a metal plate and forming a recessed groove on the obtained metal pipe by pressing is provided. It permits the enhancement of deformation resistance of the pipe by formation of the recessed groove and therefore increases the load capacity. CONSTITUTION: A metal plate is rolled and adjoined to produce a metal pipe(100) having a circular cross-section. Then, at least one portion of the outer periphery of the metal pipe is pressed to form a recessed groove(101) made in parallel to the axial direction. The formed pipe is cut to a predetermined size.