Common Defects and Causes Analysis in Precision Electronics Micro Screws

2025,08,22

Common defects in large curved deep-drawn parts include cracks and crazing, wrinkles and folds, unclear edges, poor hardness, surface scratches, surface roughness, and slip lines.

GB70.1 ST1.6*7 SUS 304 white washed cylindrical head hexagon socket tapping screws

Cracks and crazing are primarily caused by localized tensile stress in the blank exceeding the strength limit. Specific causes are as follows:

1. The material's stamping properties do not meet process requirements.

2. Sheet thickness exceeds tolerance. When sheet thickness exceeds the upper tolerance, local areas with small gaps become stuck during feeding, making stamping difficult and the material difficult to pull through the die.

When sheet thickness exceeds the lower tolerance, the material becomes thinner, increasing the compressive stress per unit area of the cross section.

Or, because the material becomes thinner, resistance decreases, and too much sheet flows into the Precision Electronics Micro Screws, preventing wrinkles from forming in the first place. In this case, the material becomes difficult to flow and is pulled apart.

Author:

Mr. yjfastener

E-mail:

hou@citool.com

Phone/WhatsApp:

+8615826187211