Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 31, No. 7 (July 2018) 1481-1489    Article in Press

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  OVALITY AND BOW DEFECT OF PRE-PUNCHED SHEETS IN ROLL FORMING OF TRAPEZOIDAL SECTIONS
 
M. Safari and J. Joudaki
 
( Received: November 20, 2017 – Accepted: January 16, 2018 )
 
 

Abstract    Roll forming process is used for manufacturing sheet metal parts by successive bending and creating the final shape with gradual deformation. In this article, deformation of a pre-punched sheet due to roll forming process will be studied. The process parameters as sheet strength, thickness, initial hole diameter and distance of hole center to lateral edge change the hole’s dimension and causing the ovality of circular hole. Also, the magnitude of product’s curve along longitudinal direction (bow defect) has been measured. The experimental tests have been done on ASTM 230, 275 and 340 galvanized steels. The results show that increase in the yield strength elongates the hole along rolling direction and shortened the hole perpendicular to rolling dimension, So, the ovality of hole increases by increasing the yield strength. Also, similar trends observed by increasing the thickness and the distance between hole center and lateral edge. The results show with increasing the material yield strength, bow effect is decreased. Also, with increase in the sheet thickness, initial hole diameter and hole distance from lateral edge the bow effect is increased.

 

Keywords    Roll forming, hole deformation, process parameters, ovality, bow defect

 

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