Torque head in Roll Forming
Torque head is a complete roller stand with final profile roller shape that not connected to any drive system (chain or gears) and roller turning by profile moving toward. Mean while the support stand for these rollers designed special that can twist up roller and down roller together with adjusted gap.
Also will install in guide line that can easily mowing up and down to fixing profile sweep. In special profile and closed type profile roll forming machine after final stand install torque head or straightening stand. For the reason that some twisting and longitudinal is still left on finished profile so by twisting back wise torque head we can make it straight back.
Conclusion for torque head roll forming
After adjusting all tooling stand gapping make sure all roller are in effective position, if any twisting –longitudinal- bow- and sweeping happen you should easily move or twist torque head stand Stand to get standard finished profile. Remember once want to modify torque head it should be with out material inside.
Cutting Unit Roll Forming Machine
For roll forming line we need cut off unit to get requirement profile length. We have two way for cutting strips or panel:
1: pre cutting: its flat blade shearing that install before forming and cut none form material to demand length.
2:shape cutting : install after forming stands, the blade is design same as profile shape, for hydraulic cutting blade or cutting saw that also saw profile after forming.
Cutting Unit Roll Forming Installation:
After material pass all roller stand and also with torque head we adjust profile twisting and longitudinal. Its time to install cutting unit on end of roll forming machine, consequently to make sure cutting blade is in right position and wont make any distortion or reflection on profile during passing profile through blade.
Inspect The Finished Profile in roll forming :
- TWISTING – BOW and chamber wont clear by small piece of profile ,From 2 pcs minimum 4 meter of profile then put it together and inspect carefully also you can turn profile and put back to back then check BOW so you will realize better.
- check angle and flat parts along the profile any wavy edge or wrinkle or wavy center then go ahead for modification.
- measure angle degree by bevel tools and all side by calipers to make sure all angles are well formed as your requirement. And each section of panel is as same as demand drawing.
MATERIAL EFFECTS in Roll Forming
- as already mentioned before start to design and produce designer care about material behavior and reflection. But sometimes by changing coil (even same material) result from roll forming machine will change. Its true, related to slitting processing and recoiling machine each coil of strips will behave different. As result should really care about material slitting processing, especially on low gauge of galvanized material.
- mostly roller gapping is in midpoint of the range of the ordered gauge tolerance. Once input material thickness extreme ends of the material gauge tolerance its necessary to change roller gap one by one with feeler.