3。 Wire drawing (wire drawing machine);

3。 Stamping (stamping die, engraving machine);

4。 Bending (90 and acute angle bending, bending flattening, offset, arc, simple die, etc. );

5。 Welding (spot welding, argon arc welding, bubble welding, etc. );

6。 Polishing (solder joint and R angle);

7。 Spray painting (liquid and powder);

8。 Assembly (riveting, pressure riveting).