The lampshade of car headlights uses the principle of reflection and refraction of light to emit a beam of light forward for illumination. Workpiece material - steel 08AL 1 mm thick. The cost of an aluminum steel plate is relatively expensive, but the performance is relatively uniform, the tendency to rupture the deformation is small and suitable for deep application of car and tractor cover parts. This workpiece is the most difficult part of deep application, so the 08AL material is chosen to provide sufficient hardness, strength and ductility.