1.What does the difference between cold-rolled coils mean?
Transverse thickness difference: refers to the maximum difference in thickness between the middle and edge of the steel coil along its width.
Longitudinal thickness difference: refers to the difference between the maximum and minimum thickness measured at any position along the same straight line along the rolling direction.
2.What does "same volume difference" measure?
Looking along the length: Are there any differences in thickness at the head, middle, and tail of the strip? (Longitudinal difference within the same strip)
Looking at the cross-section: Are there any differences in thickness between the middle and both edges of the strip? (Transverse difference within the same plate)
3.In actual production, what are the requirements for "same roll difference"?
The general control standard is that the difference between the same board and the same part should be within 0.05mm. For some high-end applications, such as home appliance manufacturing, the requirements are higher, and it may be necessary to control it within 0.01mm (i.e., 10U).
4.What impact does the magnitude of the "same roll difference" have on automated production?
During high-speed automatic stamping, uneven thickness of steel plates may cause the equipment to "jam," damaging expensive molds and even forcing the machine to stop.
5.Does the magnitude of the "difference between rolls" affect product quality?
Parts stamped from steel plates of uneven thickness may develop a "slope" during automatic riveting or stacking, leading to product scrap.