What are the abnormal quality of mobile phone shields?

The principle of mobile phone shielding cover: Use shielding body to surround components, circuits, assemblies, cables or interference sources of the entire system to prevent interference from spreading outside the electromagnetic field; use shielding body to surround receiving circuits, equipment or systems to prevent them from being affected The influence of external electromagnetic fields. The material of the mobile phone shielding cover usually uses 0.2mm thick stainless steel and nickel silver as the material, and nickel silver is a kind of metal shielding material that is easy to be tinned. The size of the mobile phone shielding cover produced by our company is strictly controlled within the tolerance range of 0.02mm to ensure its easy tinning performance and excellent shielding effect. Five major anomalies in the quality of mobile phone shielding cover 1: internal and external surface of the product, bending internal and external side pressure injury: there are two cases, (1) small hole skipping waste, large hole skipping waste: long-term production causes the punch blade wear gap to become larger. The waste material is jammed, and the punch is brought out of the mold surface to cause crushing. (2) Powder crushing: The gap between the punch and the knife edge is too large or too small to cause powder to scatter on the mold surface. When the material passes through the leveler and the feeder, the product will be directly crushed by the dust and fine iron filings in the machine. Two: Product small hole cutting burrs and burrs at the folds of the continuous cutting: the gap between the punch and the knife edge is too large to cause burrs or the punch is shifted to one side, resulting in burrs on one side and no burrs on the other side. Some of our mobile phone shielding covers are made with a cut-and-fold structure at the end, and the punches wear out after a period of production and are prone to burrs. In the last step, because the material is not pressed or the bending punch pulls the material, the product produces a peculiar smell, which causes more cuts while cutting less, and the less side will protrude and cause poor size. In the last step, the material is sometimes knocked off by the guide needle, which will cause unstable bending and shearing dimensions. Three: There are few holes on the front side of the product: no punching and shearing oil is added in the production, and the punch is broken; the small hole waste is blocked in the leaking hole due to too much oil, and the punch is broken; the foot is shifted to block the leaking hole ; The suction funnel will break the punch if the leakage hole is blocked. Four: Bending angle External tension and internal buckle: External tension, the mold is not crushed; the mold is compressed with large waste materials, products; the gap between the bending punch and the insert becomes larger; the bending inserts are worn or collapsed. The angle is flared. Internal buckle, die pressure is too strong; bending inserts have too high pressure ribs; the gap between the bending punch and the inserts is too small, which will cause the angle internal buckle. Five: Side scratches: the bending punch or the bending insert is worn; the gap between the bending punch and the insert is too small; the bending punch and the insert are stuck with waste; less fuel will cause scratches. Hardware, 15 years of ingenuity, focus on the production of metal shielding covers, silk-like precision + 16 strict quality inspections, and the concept of the result of your needs as the result of the work, let you choose, choose to rest assured!