Galvanized steel coil, in addition to the original (wide) processing, there are many occasions are based on the needs of the products to be processed to implement the strip to use. For example, rain gutters, ceiling beams, louver panels, C.Z section steel,
etc. In addition, the shell of sound equipment can also be processed by continuous stamping with strip steel coils.
In the process of slitting, special attention must be paid to the problem of bending.
Even though the coil looks straight, some of them are slightly curved. There are various reasons for the bending of strip steel coil, one of which is due to the
bad shape of steel coil before slitting. For example, in the center of the steel coil with larger elongation tendency, the length of that part will be longer, and the strip steel coil will be curved. Even if there is no arc problem in the strip steel
coil itself, the product will sometimes arc when roller forming. This is because, as shown in the figure below, before slitting, the central part of the coil is thicker, and after slitting, the transverse plate thickness of the Striped coil will be uneven.
If the roller forming process is carried out again, the roller reduction difference may cause the product to arc. In particular, when the arc needs to be strictly controlled, the steel coil with good shape must be used, or efforts must be made on the
number of strips to prevent arc.
In order to obtain the coil with good shape or small bending, it is important to specify it when ordering and discuss with the consignor.
The so-caled arc (transverse bending) refers to the deviation between
the side edge and the straight line. In terms of measurement method, the straight edge is close to the edge to measure the bending depth.