Título

EFFECTS OF CUTTING ASPECTS ON FLANGEABILITY OF HR FB580 GI STEEL*

EFFECTS OF CUTTING ASPECTS ON FLANGEABILITY OF HR FB580 GI STEEL*

Autoria

Farias, Willian Alber da Silva; Santos, Ana Luiza Dos; Ferreira, Jetson Lemos; Rodrigues, Flavio José Saraiva; Castro, Nicolau Apoena; Souza, Marden Valente de

DOI

10.5151/2594-5297-40365

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Resumo

The need to reduce the thickness of automotive components to meet the demand for lighter vehicles, combined with the increased geometric complexity of parts, has required the use of steels with greater strength and good formability. However, the low flanging capacity of high strength steels limits the application of these materials in parts with more complex geometries. The blank cutting method has a decisive influence on the flanging capacity of these steels, which is evaluated in the laboratory by hole expansion tests. The effect of shear cutting clearance and low temperatures on the hole expansion capacity of HR FB580 GI steel was evaluated. The results indicated that clearances between 5% and 27.5% of the thickness drastically change the Edge Surface Zones and decrease the cutting and punching forces. For negative temperatures, however, the opposite effect occurred, which resulted in an increase in forces due to the lower mobility of dislocations, which are thermally activated.

 

The need to reduce the thickness of automotive components to meet the demand for lighter vehicles, combined with the increased geometric complexity of parts, has required the use of steels with greater strength and good formability. However, the low flanging capacity of high strength steels limits the application of these materials in parts with more complex geometries. The blank cutting method has a decisive influence on the flanging capacity of these steels, which is evaluated in the laboratory by hole expansion tests. The effect of shear cutting clearance and low temperatures on the hole expansion capacity of HR FB580 GI steel was evaluated. The results indicated that clearances between 5% and 27.5% of the thickness drastically change the Edge Surface Zones and decrease the cutting and punching forces. For negative temperatures, however, the opposite effect occurred, which resulted in an increase in forces due to the lower mobility of dislocations, which are thermally activated.

Palavras-chave

FLANGEABILITY; TEMPERATURE; CLEARANCE; HOLE EXPANSION.

FLANGEABILITY; TEMPERATURE; CLEARANCE; HOLE EXPANSION.