When shield manufacturers produce stretched shields, these types of problems generally occur: wrinkles, uneven thickness, cracks, shape distortions, surface scratches, rebound, etc. Why does this kind of problem occur in the shielding cover of stretch parts? The shielding cover manufacturer Ningbo Hexin will analyze for you:
The main reason for the wrinkling of the stretcher shielding cover is: during the stretching process, the edge part of the material loses stability due to excessive tangential stress, which makes the product form uneven wrinkles along the edge tangential direction. When the wrinkling is severe, it will also make it difficult for the material to pass through the gap between the concave mold and the convex mold during the stretching process, increase the tensile deformation force, and even cause cracking. The occurrence of instability depends not only on the tangential stress at the edge of the material, but also on the thickness of the stretched part.
When this phenomenon occurs, what solutions do shield manufacturers generally adopt?
The shielding cover of the stretched part needs to be stretched and formed many times. Under the necessary conditions to ensure the quality of the indispensable surface layer, a few scratches caused by the stretching process on the inner and outer surface layers are acceptable. The distance between the bottom of the shielding cover of the stretched piece or the edge of the hole on the boss to the outer wall should be moderate, and the arc radius of the four design sides of the bottom and the wall, the boss and the wall, and the rectangular frame should be properly designed.