Patent ID: 9731770
Date: 2017-08-15
CPC Classifications: B62D

Claim:
1. A front pillar structure of a vehicle having a flange which connects an inner panel, an outer panel, and a side outer panel at a lateral side to which a door is mounted, wherein the inner panel, the outer panel, and the flange between the inner panel and the outer panel are integrally formed from a tubular body having a closed cross-sectional shape, wherein the front pillar structure is formed through a hot blower forming process by injecting air heated at a predetermined temperature into an internal space in the tubular body, which is disposed between an upper die and a lower die that have an inner contour corresponding to an outer contour of the front pillar, at predetermined pressure, and wherein the upper die and the lower die form a gap between lateral portions thereof, which is two times smaller than a thickness of the tubular body, such that the flange is pressed and overlapped to increase rigidity.