With regard to the machinery required, swing-flanging tools are much simpler and more robust than spin-flanging tools. The patented swing-flanging technique combines the advantages of die-flanging (minimum relative movement between tools and body, little abrasion, little flange width variation) and spin-flanging (local, continuously progressing forming) while largely avoiding the known disadvantages of these methods.
Swing-flanging is best characterised as a swinging die-flanging process. With swing-flanging the flange is formed sequentially, i.e. only at those points where the swing-flanging heads are currently in contact with the body. Due to the rotation of the inner spindle, the flanging head performs a swinging movement (but does not rotate itself) so that the point of contact with the body rotates around its circumference. The flange is formed or rolled out by the slow penetration of the swinging flanging heads. The body runs along the flanging radius of the flanging heads and the shoulder of the flanging heads to the stop ring. The stress exerted on the material is slightly lower than with die-flanging, but slightly higher than with spin-flanging. The absolute load acting on the neck is hardly higher than with spin-flanging, although unlike in spin-flanging the load is absorbed at sequential points located off-center.