This is the full introduction of procedure for cutting strips of various sizes from a hot rolled mild steel coil. The strips can be used for manufacturing and processing square rectangular and circular hollow sections or tubes. During the process, width of the strips vary from 47/48 mm and thickness of just 1 mm to make 12×12 sqmm hollow sections to width of 670 mm and thickness of 5.9 to 6 mm to make 175×175 sqmm hollow sections or 200×150 sqmm rectangular hollow sections. With this process, the hot rolled mild steel coil is bundled inside a six to ten tone-package having a width of 1200 to 1300 mm.
Materials required for this process include: slitting line machine, overhead crane, weighing scale, micro meter screw gauge, 3 meter steel tape and the mild steel hot rolled coil.
Prior to the process the coil is visually checked for deformities, which includes burrs, dent edges, elongations, lamination and waviness. It should also be prepared for supplier tolerance on mechanical qualities, knowingly thickness and width.
When the coil is ready, the straps which seal the coil are welded off leaving the one that would contain the coil stopping it from unfolding or uncoiling before loading it onto the slitting line machine.
The coil will be put into the slitting line machine with the aid of an overhead crane and to the slitting line vehicle in the slitting line bay. When the device is switched on, the coil is pressed forward using hydraulic pressure and elevated as much as be sandwiched by cone-formed mandrel from the plate drums that straightens them. The rest of the scrap is scaled off utilizing a pinch roll-up, this will make it accustomed to offer the coil to enter with the rollers. Before the material reaching the cutters, the coil width is measured utilizing a three meter steel tape and also the thickness measured using 0 to 25 mm micro meter screw gauge to be from the needed dimensions. These steps are repeated 3 times at the beginning of the procedure, once the material will get towards the abdominal area so when it will get towards the finish.
If all is done, the device is switched back on and also the material undergone the cutters. As the procedure continues, the strips are gone to live in the mandrel that straightens them, in which the separator shaft can be used to avoid the strips from intermingling. The edges – which are members of the extra width – are thought extra material (scrap), they’re rolled and attached through the scrap winder unit which moves inside a circular motion concurrently using the machine because the materials are being processed. Adjustment screws are attached to lock the strips so when the mandrel begins to recoil, the strips wouldn’t remove or slip off.
As the process pushes forward, speed is gradually increased to permit easy flow of strips which are being cut in the form of slits. The clutch in the primary slitting drive is released to guarantee the process is continuous. Strips are tightened by inserting short strip straps as the operation is ongoing. In the end of the process, the strips are welded. At this point the separator shaft is moved upwards and also the mandrel screws are unlocked to gain access to and remove the strips. This time culminates the process for slitting of mild-steel strips.