How to choose your roll forming machine?HOW TO CHOOSE A ROLL FORMER Roll forming is a continuous bending method in which a long tape of sheet steel is passed via rolls mounted on successive stands, each set executing only an incremental part of the bend, till the preferred cross-part profile is obtained. Roll forming is perfect for generating continuous-profile components with long lengths and in big quantities. Pre-cut vs post-cut roll forming machine: There are two different types of roll forming machines, a Pre-Cut roll forming machine, and Post Cut roll forming machine. There are advantages as well as disadvantages to both.
Advantages and disadvantages Pre-Cut roll forming machinePre-cut advantages:
- remove costly cut-off dies and their maintenance
- Simple low-keeping pre-cut shear
- Ability to hand-feed strips or sheets for low-volume production
- In roofing and wall panel products, pre-cut avoids cut-off distortion
- need more forming stations making the roll former and tooling more expensive
- need more floor space
- Difficult multi-bend parts
- Pre-cut may require intermediate guides, especially when running short pieces.
Advantages and disadvantages post-Cut roll forming machinePOST-CUT PROS
- The production rate is higher with post-cut.
- Better part control in terms of quality.
- Better results for high-strength steels.
- Lengths as short as 2 into 3 can produce.
- Ability to provide punching/notching during the cut-off operation.
- Expensive cut-off press and die.
- Maintenance costs, especially for the cut-off die.
- Distortion on product end.