1. Production process flow: ① Cutting, bending, drilling, punching, shaping, etc. → ② Cleaning the surface of the cutting parts of sandblasting, burrs, flying edges, oxide scales, rust, chips, oil stains, etc. → ③ Riveting and welding → ④ Cleaning shaping → ⑤ Coating (spraying anti-corrosion paint and topcoat)