Quality objection case of steel coil pressing point
Case Introduction:
A stainless steel processing center purchased a batch of stainless steel coils. During unpacking and processing, it was found that many coils had serious pressure points on the surface. Thinner steel coils often affect more than ten layers, and thicker ones can affect about 5 layers. .
Case Analysis:
After a careful inspection on the spot, these pressure points are all impacted by some kind of impact on the original roll or pressed out by protrusions, and the outer packaging skin of the original roll has indentations, which are large dots. Since there are many steel coils affected, it should basically be caused by the same reason.
After checking the storage records of the storage department, it was found that the outer packaging of this batch of stainless steel coils was damaged to a certain extent before the storage. However, due to the long-distance transportation of the steel coils, the packaging will inevitably be damaged, and it is impossible to unpack it in the warehouse Check, so it was put into the warehouse as normal.
At that time, another batch of steel coils arrived in the warehouse, so on-site inspection found that this batch of steel coils also had serious pressure point problems. After verification, it was caused by the bolts on the U-shaped wooden frame on the truck that transported the steel coils.
Due to the long-term pressure and vibration during transportation, many bolts on the U-shaped wooden frame protrude from the original surface and directly contact the steel coil, pressing very serious pressure points on the steel coil.
Process Result:
Check the damage condition of this batch of steel coils, claim compensation from the transportation company, and submit rectification requirements.
Many quality problems do not occur in the processing process, and some details that are usually overlooked, such as storage and transportation, can also cause quality problems.
The wooden frame used by the machining center itself should also be checked for damage frequently to prevent the wooden frame from causing quality problems due to excessive time.